33 results on '"Atsushi Kamimoto"'
Search Results
2. Medication-related osteonecrosis of the jaw after tooth extraction in patients receiving pharmaceutical treatment for osteoporosis: A retrospective cohort study
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Keisuke Seki, Tadayoshi Kaneko, Atsushi Kamimoto, Maki Wada, Yoshimasa Takeuchi, Mika Furuchi, and Toshimitsu Iinuma
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Bisphosphonate ,Denosumab ,Drug holiday ,Medication-related osteonecrosis of the jaw ,Tooth extraction ,Dentistry ,RK1-715 - Abstract
Background/purpose: Bone resorption inhibitors, such as bisphosphonates (BPs) and anti-receptor activator of nuclear factor kappa B ligand antibodies (denosumab; Dmab), are used to treat osteoporosis and effectively reduce the risk of fracture. However, medication-related osteonecrosis of the jaw (MRONJ) has been reported as a rare adverse effect. Invasive tooth extraction procedures are reportedly a factor in the development of MRONJ. In this study, we aimed to retrospectively observe and clinically examine the effect of medication status on MRONJ development after tooth extraction in patients receiving drug treatment for osteoporosis. Materials and methods: This study was conducted among patients who visited our hospital between December 2015 and December 2021. We collected and analyzed the medical information of patients who underwent dental extractions while using osteoporosis medications, including oral and injectable BPs and Dmab. Results: Among antiresorptive medication users, 40 patients (70 teeth) underwent extraction. The mean duration of BP/Dmab use was 40.4 months, and the mean duration of drug holiday was 6.9 months. MRONJ after tooth extraction was not seen in BP users, but we observed two cases in Dmab users. A significant difference in MRONJ development was confirmed with the use of injectable compared with oral medication administration (odds ratio=5.01). Conclusion: The use of injectable bone resorption inhibitors was associated with a higher risk of developing MRONJ. The route of administration, duration of medication, and withdrawal period should be carefully considered to prevent MRONJ after tooth extraction.
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- 2022
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3. Peri-implant osteonecrosis of the jaw in a patient prescribed selective estrogen receptor modulators
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Tona Yoshino, Keisuke Seki, Maki Nagasaki, and Atsushi Kamimoto
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MRONJ ,Diabetes mellitus ,Selective estrogen receptor modulator ,Raloxifene hydrochloride ,Dentistry ,RK1-715 - Published
- 2023
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4. Periapical granuloma with actinomycosis and medication-related osteonecrosis of the jaw in a patient prescribed high-dose ibandronate
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Keisuke Seki, Takako Kumabe, Maki Wada, and Atsushi Kamimoto
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Dentistry ,RK1-715 - Published
- 2023
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5. Efficacy of glycine air-powder abrasion for treatment of peri-implantitis
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Keisuke Seki, Takayuki Ikeda, Atsushi Kamimoto, and Yoshiyuki Hagiwara
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Dental implant ,Peri-implantitis ,Air-powder abrasion ,Glycine powder ,Dentistry ,RK1-715 - Published
- 2022
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6. Correlations between clinical parameters in implant maintenance patients: analysis among healthy and history-of-periodontitis groups
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Keisuke Seki, Shinya Nakabayashi, Naoki Tanabe, Atsushi Kamimoto, and Yoshiyuki Hagiwara
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Dental implant ,Maintenance ,Modified plaque index ,Probing depth ,Bleeding on probing ,Correlation ,Medicine ,Dentistry ,RK1-715 - Abstract
Abstract Background The pathophysiology and pathology of peri-implantitis remain unclear; however, its similarity to periodontitis has been described. The evaluation of peri-implant tissue and the diagnostic criteria of peri-implant disease are not currently standardized as they are for periodontitis. In this study, we evaluated clinical parameters during the implant maintenance period to determine significant correlations between these parameters. Methods We examined 55 implant patients at the time of maintenance visits between April and September 2016 and classified patients into a healthy group (H) and a history-of-periodontitis group (HP). For each implant, we evaluated the modified plaque index, probing pocket depth, and bleeding on probing as clinical parameters. Statistical analyses were performed with Spearman’s rank correlation coefficient. Results A total of 130 implants were assessed. The mean time since implant placement was 6 years and 6 months. The prevalence of implant-based peri-implantitis was 10.8% of all the implants. All cases of implant-based peri-implantitis came from the HP group, and many were present in patients with a history of severe periodontitis. The probing pocket depth around the implant was significantly greater in the HP group than in the H group. We found weak positive correlations between the probing pocket depth and bleeding on probing (r s = 0.401, p
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- 2017
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7. Influence of ion-releasing filler-containing gel application on dentin remineralization by using ultrasonic velocity measurement.
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Miho Suzuki, Hiroyasu Kurokawa, Taketo Okuwaki, Toshiki Takamizawa, Atsushi Kamimoto, Koji Komoriya, Ryo Ishii, and Masashi Miyazaki
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REMINERALIZATION (Teeth) ,DENTIN ,DENTAL fillings ,FILLER materials ,VELOCIMETRY ,COLLOIDS ,ULTRASONIC measurement - Abstract
Purpose: The main objective of this study was to investigate the efficacy of S-PRG filler-containing gel application in promoting dentin remineralization using ultrasonic velocimetry. Methods: Root dentin slabs of bovine teeth were sliced and formed into rectangles, treated with 0.1 M lactate buffer (pH 4.75) for 10 min, and then immersed in artificial saliva (pH 7.0). This treatment was repeated three times a day for 28 days. S-PRG filler-containing gel (PRG) and high-fluorine concentration silver diamine fluoride (SDF) solution were used. The treatment methods were: 1) untreated group, 2) PRG one-off application group, 3) SDF oneoff application group, 4) PRG frequent-time application group, and 5) SDF frequent-time application group. After treatment, dentin slabs were soaked in 0.1 M lactate buffer solution and dipped in artificial saliva. This treatment was repeated 3 times a day for 28 days. Results: The ultrasonic velocity of the untreated samples decreased slightly during the experimental period. In the one-off application group, ultrasonic velocities of SDF and PRG increased rapidly on day 7 and then decreased slightly during the experimental period. In the frequent-time application group, ultrasonic velocities of SDF and PRG increased during the experimental period; specimens treated with SDF had significantly higher ultrasonic velocities on each measurement day compared to specimens treated with PRG. Conclusion: From the results of this experiment, it was concluded that the S-PRG filler-containing gel and silver diamine fluoride solution appear to promote remineralization and inhibit dentin demineralization. [ABSTRACT FROM AUTHOR]
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- 2024
8. Influence of etching mode on bonding performance of self-adhesive flowable resin composites to bovine teeth.
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Kana HAYASHI, Ryo ISHII, Toshiki TAKAMIZAWA, Ryota AOKI, Rei MUTO, Shunichi SUDA, Atsushi KAMIMOTO, and Masashi MIYAZAKI
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SCANNING electron microscopy ,BOND strengths ,DENTIN ,SHEAR strength ,DENTAL enamel - Abstract
This study aimed to evaluate the bonding performance of self-adhesive flowable resin composites (SARs) to bovine teeth. Three SARs, one experimental, and two commercially available products, were used. The study parameters were shear bond strength (SBS), microleakage, and scanning electron microscopy (SEM) evaluation of bonding interfaces. The SBS of the materials was 14.1–15.1 MPa to enamel, 22.2–23.2 MPa to etched enamel, and 7.4–10.7 MPa to dentin. Specimens with pre-etching showed lower microleakage scores than those without pre-etching. SEM images of the interfaces of the materials showed excellent adaptation regardless of the substrate or etching mode. The study results indicate that enamel pre-etching can improve the bonding performance of SARs. [ABSTRACT FROM AUTHOR]
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- 2024
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9. Scanning electron microscopy observation of dentin bond interfaces in different types of resin luting cements.
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Toshiki TAKAMIZAWA, Ryota AOKI, Kana HAYASHI, Mone SHOJI, Yuta KASAHARA, BARKMEIER, Wayne W., LATTA, Mark A., Atsushi KAMIMOTO, and Masashi MIYAZAKI
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DENTAL cements ,SCANNING electron microscopy ,DENTAL glass ionomer cements ,DENTIN ,SCANNING systems - Abstract
This study aimed to observe and compare the resin luting cement (RLC)/dentin interfaces of different types of RLC systems with scanning electron microscopy (SEM). This study evaluated six self-adhesive resin luting cement systems (SARLCs), four systems combining a SARLC with a tooth primer (SARLCPs), and six conventional resin luting cement systems (CVRLCs). Cured resin composite rods were bonded to bovine dentin using RLCs in different etching modes. The morphological features at the interfaces were observed using SEM. Although all RLCs in etch-&-rinse (ER) mode showed a clear hybrid layer, most SARLCs had a thinner and more porous hybrid layer than the SARLCPs and CVRLCs. All SARLCPs with primer and CVRLCs showed a thin high-density layer below the primer layer in both etching modes. CVRLCs and SARLCPs with primer treatment systems may be more versatile and reliable when compared to simplified RLC systems [ABSTRACT FROM AUTHOR]
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- 2024
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10. Early Phase Enamel Bond Performance of a Two-step Adhesive Containing a Primer Derived from a Universal Adhesive.
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Kei Iwase, Toshiki Takamizawa, Keiichi Sai, Sho Shibasaki, Barkmeier, Wayne W., Latta, Mark A., Atsushi Kamimoto, and Masashi Miyazaki
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Purpose: To investigate the changes in the enamel bond performance of a two-step adhesive containing a primer derived from a universal adhesive in the early phase before 24 h and compare them to those of other adhesives. The Knoop hardness number (KHN) of the cured adhesive layers and resin composite was measured. Materials and Methods: A new two-step adhesive using universal adhesive technology, G2-Bond Universal, was tested. Two conventional two-step adhesives, Clearfil SE Bond 2 and OptiBond eXTRa, and an established universal adhesive, Scotchbond Universal Plus Adhesive, were used as comparison materials. Twelve specimens per group were used to measure the shear bond strength (SBS) to bovine enamel in different etching modes. The bonded specimens were stored in distilled water at 37°C for 5 min or 1, 6, 12, or 24 h before SBS testing. The KHN of the adhesive layer and resin composite was determined after the same storage periods as for SBS testing. Results: All adhesives exhibited increased SBS with prolonged storage periods, irrespective of the etching mode. The KHN of the adhesive layer and resin composite increased over time. Conclusions: There were strong positive correlations between the SBS and KHN of the adhesive layer and resin composite. Phosphoric acid pre-etching of enamel effectively increases enamel bond performance. The two-step adhesive G2-Bond Universal demonstrated significantly higher bond strength in the early phase than the other adhesives in self-etch mode. [ABSTRACT FROM AUTHOR]
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- 2022
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11. Treatment of saliva contamination of resin core foundation before adhesive luting.
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Koji HAYASHI, Ryo ISHII, Toshiki TAKAMIZAWA, Shunichi SUDA, Ryota AOKI, Kana HAYASHI, Atsushi KAMIMOTO, and Masashi MIYAZAKI
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SURFACE preparation ,DENTAL cements ,TWO-way analysis of variance ,SALIVA ,FIREPROOFING agents ,BOND strengths - Abstract
This study aimed to evaluate the influence of surface pretreatment on the shear bond strength of resin luting cement to saliva-contaminated resin core foundation. The surface free energy (γ
S ) of the adherent surfaces was examined. The two-way analysis of variance revealed that the surface pretreatment and storage conditions had a significant effect on the strength of the bond to resin core foundation. The γS values of the saliva-contaminated group were significantly lower than those of the other groups, and they tended to improve after surface pretreatment. The tendency of improvement in γS values differed depending on the type of pretreatment agents. Surface treatment with solutions containing functional monomers is effective in removing saliva contaminants from the resin core foundation surfaces and in creating an effective bonding surface for the resin luting cement [ABSTRACT FROM AUTHOR]- Published
- 2024
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12. Whitening efficacy and tooth sensitivity in a combined in‐office and at‐home whitening protocol: A randomized controlled clinical trial
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Toshiki Takamizawa, Ryota Aoki, Makoto Saegusa, Eizo Hirokane, Mone Shoji, Munenori Yokoyama, Atsushi Kamimoto, and Masashi Miyazaki
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General Dentistry - Published
- 2023
13. Influence of surface roughness of universal shade resin composites on color adjustment potential.
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Kana HAYASHI, Hiroyasu KUROKAWA, Makoto SAEGUSA, Ryota AOKI, Toshiki TAKAMIZAWA, Atsushi KAMIMOTO, and Masashi MIYAZAKI
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SURFACE roughness ,COLORIMETRY ,DENTURES ,ONE-way analysis of variance ,STRUCTURAL colors - Abstract
This study aimed to determine the influence of surface roughness of the color adjustment potential restoration of universal resin composites. A structural colored resin composite (Omnichroma, OC) and a pigment-employed universal shade resin composite (Beautifil Unishade, BU) were used. Each resin composite was placed in a cavity to determine its ability to match the color of artificial teeth. The surface of the resin composites was polished with #800- or #2000-grit SiC paper before performing color measurements. One-way analysis of variance and Tukey post hoc tests were performed (a=0.05). The color difference (ΔE*ab) ranged from 2.5-3.9 for OC and 1.8-8.7 for BU. OC has a more stable color adjustment than BU. The color adjustment potential of universal resin composites was affected by the surface roughness of the restorations. [ABSTRACT FROM AUTHOR]
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- 2023
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14. A nested case-control study of factors contributing to the development of medication-related osteonecrosis of the jaw in patients using bone resorption inhibitors in Mishima City
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Keisuke Seki, Atsushi Kamimoto, Maki Wada, and Toshimitsu Iinuma
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General Dentistry - Published
- 2023
15. Periapical granuloma with actinomycosis and medication-related osteonecrosis of the jaw in a patient prescribed high-dose ibandronate
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Keisuke Seki, Takako Kumabe, Maki Wada, and Atsushi Kamimoto
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Correspondence ,General Dentistry - Published
- 2022
16. Usage of English prosthodontic terms 2019 in Japan
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Mika Furuchi, Yoshimasa Takeuchi, Atsushi Kamimoto, and Hiroyasu Koizumi
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Japan ,General Dentistry ,Prosthodontics - Abstract
The use of a uniform terminology is important to avoid misunderstanding of concepts or procedures in discussion. The usage of English prosthodontic terms in Japan was investigated in the current study. English prosthodontic terms listed in The Glossary of Prosthodontic Terms edited by the Japan Prosthodontic Society (GPTJ-5) were compared to those in The Glossary of Prosthodontic Terms ninth edition (GPT-9). A small number of terms labeled as objectionable in GPT-9 were listed in GPTJ-5. This might indicate that it takes a long time to replace terms that are used widely.
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- 2022
17. Comparison of dentin bond durability in different adhesive systems containing glycerol-phosphate dimethacrylate (GPDM) functional monomers under long-term water storage
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Kei Koike, Toshiki Takamizawa, Ryota Aoki, Sho Shibasaki, Ryo Ishii, Keiichi Sai, Atsushi Kamimoto, and Masashi Miyazaki
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Biomaterials ,Polymers and Plastics ,General Chemical Engineering - Published
- 2023
18. Diagnostic Tool Using the Diagnostic Criteria for Temporomandibular Disorders: A Randomized Crossover-Controlled, Double-Blinded, Two-Center Study
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Olga A. Korczeniewska, Junad Khan, Noboru Noma, Atsushi Kamimoto, Samantha Gallia, Andrew L. Young, Mythili Kalladka, and John F. Ryan
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medicine.medical_specialty ,Cross-Over Studies ,Tool Use Behavior ,business.industry ,Double blinded ,Crossover ,MEDLINE ,Temporomandibular Joint Disorders ,Crossover study ,Checklist ,law.invention ,stomatognathic diseases ,Anesthesiology and Pain Medicine ,Randomized controlled trial ,Facial Pain ,law ,Physical therapy ,medicine ,Humans ,Dentistry (miscellaneous) ,Neurology (clinical) ,Facial pain ,Medical diagnosis ,business ,human activities - Abstract
To assess the speed and accuracy of a checklist user interface for the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD).A diagnostic tool formatted as a checklist was developed and compared to an existing diagnostic tool, the DC/TMD diagnsostic decision trees. Both types of tools use the DC/TMD and were tested by dental students, interns, and residents in the USA and Japan for diagnosis of hypothetical patients. The comparisons were done in a randomized, crossover, controlled, double-blinded trial.Overall, subjects using the experimental tool answered 25% more correct diagnoses (P.001) and missed 27% fewer diagnoses (P.01). They were also able to finalize their diagnoses faster than those using the control tool, in 16% less time (P.05). The difference in accuracy was more pronounced in complex cases, while the difference in speed was more pronounced in simple cases.This checklist is an alternative user interface for the DC/TMD.
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- 2021
19. A nested case-control study of factors contributing to the development of medicationrelated osteonecrosis of the jaw in patients using bone resorption inhibitors in Mishima City.
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Keisuke Seki, Atsushi Kamimoto, Maki Wada, and Toshimitsu Iinuma
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BONE resorption ,OSTEONECROSIS ,CASE-control method ,QUALITY of life ,LOGISTIC regression analysis ,OSTEOCLASTS - Abstract
Purpose: Medication-related osteonecrosis of the jaw (MRONJ) is characterized by necrosis of the jawbone with intraoral bacterial infection and has a significant negative impact on oral health-related quality of life. Risk factors for the onset are unknown, and definitive therapeutic approaches have not yet been defined. A case-control study at a single institution in Mishima City was conducted. The purpose of this study was to examine in detail the factors that contribute to the development of MRONJ. Methods: Medical records of MRONJ patients who visited Mishima Dental Center, Nihon University School of Dentistry, during the period 2015-2021 were extracted. Counter-matched sampling design was used to select participants matched for sex, age, and smoking for this nested casecontrol study. The incidence factors were statistically examined by logistic regression analysis. Results: Twelve MRONJ patients were used as cases and 32 controls were matched. After adjustment for potential confounders, injectable bisphosphonates (aOR = 24.5; 95% CI = 1.05, 575.0; P < 0.05) were significantly associated with the development of MRONJ. Conclusion: High-dose bisphosphonates may be a risk factor for the development of MRONJ. Patients who use these products require careful prophylactic dental treatment against inflammatory diseases, and dentists and physicians should maintain close communication. [ABSTRACT FROM AUTHOR]
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- 2023
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20. Influence of bonding agent application method on the dentin bond durability of a two‐step adhesive utilizing a universal‐adhesive‐derived primer
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Shun Katsuki, Toshiki Takamizawa, Munenori Yokoyama, Keiichi Sai, Tomohiko Tamura, Ryo Ishii, Atsushi Kamimoto, and Masashi Miyazaki
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Acid Etching, Dental ,Dentin-Bonding Agents ,Dentin ,Materials Testing ,Dental Bonding ,Dental Cements ,Shear Strength ,General Dentistry ,Resin Cements - Abstract
This study investigated the effect of the bonding agent application method on the dentin bond durability of a two-step adhesive utilizing a universal-adhesive-derived primer. The bonding durability of a universal adhesive was compared with those of two conventional two-step adhesives by shear bond strength testing after thermal cycling. The primer was applied (with or without phosphoric acid pre-etching), and the specimens were divided into three groups based on the bonding agent application method used as follows: (i) strong air-flow application, (ii) gentle air-flow application, and (iii) gentle air-flow + second bonding application. The shear bond strength was determined after thermal cycling. All the factors (bonding agent application method, adhesive system, and storage condition) significantly influenced the dentin shear bond strength both with and without phosphoric acid pre-etching. The specimens exposed to gentle air-flow showed a higher shear bond strength than did those exposed to strong air-flow and gentle air-flow + second bonding. The bond durability of the tested adhesive systems was influenced by the bonding agent application method, and this trend was material dependent. The G2-Bond Universal exhibited the same or greater dentin bond durability to the other two-step adhesive systems.
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- 2022
21. Implant diagnostic imaging impaired by cosmetic gold thread therapy
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Keisuke Seki, Atsushi Kamimoto, Yoshimasa Takeuchi, and Mika Furuchi
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General Dentistry - Published
- 2022
22. Fabrication systems for restorations and fixed dental prostheses made of titanium and titanium alloys
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Junko Tanaka, Yoshimasa Takeuchi, Mika Furuchi, Masahiro Tanaka, Hideyuki Imai, and Atsushi Kamimoto
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Materials science ,Allergic reaction ,Fabrication ,Biocompatibility ,0206 medical engineering ,Metal Ceramic Alloys ,chemistry.chemical_element ,02 engineering and technology ,03 medical and health sciences ,0302 clinical medicine ,Alloys ,Dentistry (miscellaneous) ,Ceramic ,Titanium ,Metallurgy ,Clinical performance ,Titanium alloy ,030206 dentistry ,Dental Marginal Adaptation ,020601 biomedical engineering ,Dental Prosthesis Design ,chemistry ,visual_art ,visual_art.visual_art_medium ,Computer-Aided Design ,Oral Surgery - Abstract
Purpose In recent years, the application of restorations and fixed dental prostheses to molars by computer-aided design-computer-aided manufacturing (CAD/CAM) with composite resin has been increasing. Titanium and titanium alloy having a high tissue affinity and good biocompatibility are suitable for cases where CAD/CAM fabrications are inadequate, such as allergic reaction to metal. Many studies have reported methods of production with titanium and titanium alloys. The purpose of this review is to survey the clinical application of titanium and titanium alloy restorations and fixed dental prostheses with various fabrication systems. Study selection A literature search in PubMed was performed for various fabrication systems of titanium and titanium alloy from 2010 through 2019. The search keywords were “titanium”, “titanium alloy”, “CAD/CAM”, “cast”, “fabrication system”, “marginal gap”, “internal gap”, and “clinical performance”. Only relevant studies are summarized and discussed in this review. Results With any fabrication system, titanium and titanium alloy restorations and fixed dental prostheses fabricated with various systems were within the clinically acceptable ranges of marginal gap and internal fit. Additionally, these restorations were considered to have less effect on the periodontal issues. Although metal–ceramic restoration has clinical performance problems, such as ceramic fracture, fabrications with only titanium and titanium alloy were reported to have good clinical performance. Conclusions Regardless of the fabrication system, titanium and titanium alloy restorations and fixed dental prostheses can be applied clinically. Titanium and titanium alloys are thought to be a promising alternative to the dental metals currently used.
- Published
- 2020
23. Correlations between implant success rate and personality types in the older people: A preliminary case control study
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Keisuke Seki, Takayuki Ikeda, Kentaro Urata, Hiroshi Shiratsuchi, Atsushi Kamimoto, and Yoshiyuki Hagiwara
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General Dentistry - Abstract
Older patients inevitably have a higher need for implant treatment, it is unknown how mental changes or psychological aspects affect the outcome of implant treatment. This study evaluated the success rate of implants and the influence of personality traits in the older people. The goal was to provide evidence for predictable implant treatment while taking into account the unique psychological changes of elders.Participants were patients who were able to independently visit our hospital between March 2004 and May 2021. Inclusion criteria were patients aged 65 years or older at the time of implant placement with regular follow-up for at least 1 year. The implant success rate was calculated by counting peri-implantitis and implant loss as failures. Multivariate analysis was used to examine the effect of patient personality characteristics on the success rate.Fifty-six implants were included in 23 patients (12 men, 11 women), with a mean age of 68.5 years (65-76) and mean maintenance duration of 9 years and 2 months. The cumulative survival rate was 87% at the patient level (94.6% at the implant level). Statistically significant differences were found for adaptive traits (odds ratio [OR] = 0.04) and non-adaptive traits (OR = 6.38); however, no significant differences were found for the other independent variables.The overall implant success rate was 69.6% at the patient level (82.1% at the implant level). The personality traits in older people had a significant effect on the implant failure rate.
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- 2021
24. Influence of polymerization methods and priming agents on the bond strength between resin luting agents and gold alloy
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Akiko Hashiguchi, Mika Furuchi, Haruto Hiraba, Atsushi Kamimoto, Akihisa Kodaira, and Momoko Shimada
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Materials science ,Surface Properties ,Scanning electron microscope ,Bond strength ,Dental Bonding ,Dental Cements ,Luting agent ,030206 dentistry ,Priming (agriculture) ,Polymerization ,Resin Cements ,Gold alloy ,03 medical and health sciences ,0302 clinical medicine ,Flexural strength ,Materials Testing ,Knoop hardness test ,Gold Alloys ,Composite material ,Shear Strength ,General Dentistry ,030217 neurology & neurosurgery - Abstract
Purpose To evaluate the influence of polymerization methods and a metal priming agent on the bond strength between gold alloy for metal ceramic restorations and dual-cure-type resin luting agents, and on the strength and hardness of the luting agents. Methods A total of 154 disks cast by a gold alloy were treated with or without a metal priming agent. One of the three luting agents was applied on the disk. The luting agent was either chemically or dual-polymerized. The shear bond strength was measured both before and after thermocycling. In addition, scanning electron microscope (SEM) observation, flexural strength test, and Knoop hardness test were performed. Results Significant differences among the luting agents were observed in terms of bond strength and flexural strength. Significant differences between chemically and dual-polymerized luting agents were observed regarding shear bond strength, flexural strength, and Knoop hardness before thermocycling. The application of the priming agent was effective only for a luting agent. Conclusion Both bond strength and flexural strength differed among three luting agents. The effect of the priming agent on bond strength differed among the luting agents. Both the bond and flexural strength of a chemically polymerized luting agent differed before or after thermocycling.
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- 2021
25. Fabrication of titanium restoration by means of calcium aluminate-bonded magnesia investment material and one-chamber arc casting apparatus
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Mika Furuchi, Atsushi Kamimoto, Yoshimasa Takeuchi, Hideyuki Imai, Hiroyasu Koizumi, and Hideo Matsumura
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Fabrication ,Materials science ,Biocompatibility ,Surface Properties ,Aluminate ,Polishing ,chemistry.chemical_element ,Mandibular second molar ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Materials Testing ,Aluminum Compounds ,General Dentistry ,Titanium ,Wax ,Dental Casting Technique ,Metallurgy ,technology, industry, and agriculture ,030206 dentistry ,Calcium Compounds ,chemistry ,Casting (metalworking) ,visual_art ,visual_art.visual_art_medium ,Dental Casting Investment ,Magnesium Oxide ,030217 neurology & neurosurgery - Abstract
Cast titanium restoration for molars has high biocompatibility and is covered by the Japanese national health insurance. Titanium casting requires specific investment material and casting apparatus. A cast restoration for the mandibular left second molar was fabricated using titanium in this study. A wax pattern fabricated on a definitive cast was invested in calcium aluminate-bonded magnesia investment material. Titanium was cast using an argon gas pressure one-chamber casting apparatus. No defects were observed on the surface and the hole was clearly reproduced. A smooth surface on the restoration was obtained by polishing at low speed. Reproductivity and polishing properties of the titanium restoration fabricated in this study were comparable to those of conventional dental metal restorations.
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- 2020
26. Saliva-based PCR tests for SARS-CoV-2 detection
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Ryutaro Kobayashi, Atsushi Kamimoto, Kazuya Honda, Hideo Matsumura, Yoshimasa Takeuchi, and Mika Furuchi
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Saliva ,Screening test ,Coronavirus disease 2019 (COVID-19) ,viruses ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,Pneumonia, Viral ,medicine.disease_cause ,Polymerase Chain Reaction ,law.invention ,Betacoronavirus ,03 medical and health sciences ,0302 clinical medicine ,stomatognathic system ,law ,Humans ,Medicine ,Pandemics ,General Dentistry ,Polymerase chain reaction ,Coronavirus ,biology ,Clinical Laboratory Techniques ,SARS-CoV-2 ,business.industry ,COVID-19 ,virus diseases ,Outbreak ,030206 dentistry ,biology.organism_classification ,Virology ,Severe acute respiratory syndrome-related coronavirus ,Coronavirus Infections ,business ,030217 neurology & neurosurgery - Abstract
The outbreak of novel coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread worldwide. Nasopharyngeal swabs are widely used in polymerase chain reaction (PCR) test to detect SARS-CoV-2. However, the collection of nasopharyngeal swabs has a series of drawbacks concerning exposure of healthcare staff, difficulty in collection, and discomfort of patients. Therefore, an alternative noninvasive sample for diagnostic of emerging viral diseases is required. The usefulness of saliva screening tests is compared to conventional swab tests in this report. The results suggest that saliva could be a reliable sample for detecting SARS-CoV-2.
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- 2020
27. Varying butyric acid amounts induce different stress- and cell death-related signals in nerve growth factor-treated PC12 cells: implications in neuropathic pain absence during periodontal disease progression
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Noriaki Kamio, Keisuke Seki, Tomoko Kurita-Ochiai, Kuniyasu Ochiai, Yuko Saito, Marni E. Cueno, and Atsushi Kamimoto
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0301 basic medicine ,Cancer Research ,Programmed cell death ,Neurite ,Clinical Biochemistry ,Cell ,Pharmaceutical Science ,Apoptosis ,Biology ,medicine.disease_cause ,PC12 Cells ,03 medical and health sciences ,0302 clinical medicine ,Nerve Growth Factor ,Neurites ,medicine ,Animals ,Periodontal Diseases ,Pharmacology ,Biochemistry (medical) ,Neurodegeneration ,Cell Biology ,medicine.disease ,Rats ,Cell biology ,Oxidative Stress ,030104 developmental biology ,medicine.anatomical_structure ,Nerve growth factor ,Biochemistry ,Disease Progression ,Butyric Acid ,Neuralgia ,Signal transduction ,Transcription Factor CHOP ,030217 neurology & neurosurgery ,Oxidative stress ,Signal Transduction - Abstract
Neuropathic pain is absent from the early stages of periodontal disease possibly due to neurite retraction. Butyric acid (BA) is a periodontopathic metabolite that activates several stress-related signals and, likewise, induce neurite retraction. Neuronal cell death is associated to neurite retraction which would suggest that BA-induced neurite retraction is ascribable to neuronal cell death. However, the underlying mechanism of BA-related cell death signaling remains unknown. In this study, we exposed NGF-treated PC12 cells to varying BA concentrations [0 (control), 0.5, 1.0, 5.0 mM] and determined selected stress-related (H2O2, glutathione reductase, calcium (Ca(2+)), plasma membrane Ca(2+) ATPase (PMCA), and GADD153/CHOPS) and cell death-associated (extrinsic: FasL, TNF-α, TWEAK, and TRAIL; intrinsic: cytochrome C (CytC), NF-kB, CASP8, CASP9, CASP10, and CASP3) signals. Similarly, we confirmed cell death execution by chromatin condensation. Our results showed that low (0.5 mM) and high (1.0 and 5.0 mM) BA levels differ in stress and cell death signaling. Moreover, at periodontal disease-level BA concentration (5 mM), we observed that only FasL amounts were affected and occurred concurrently with chromatin condensation insinuating that cells have fully committed to neurodegeneration. Thus, we believe that both stress and cell death signaling in NGF-treated PC12 cells are affected differently depending on BA concentration. In a periodontal disease scenario, we hypothesize that during the early stages, low BA amounts accumulate resulting to both stress- and cell death-related signals that favor neurite non-proliferation, whereas, during the later stages, high BA amounts accumulate resulting to both stress- and cell death-related signals that favor neurodegeneration. More importantly, we propose that neuropathic pain absence at any stage of periodontal disease progression is ascribable to BA accumulation regardless of amount.
- Published
- 2016
28. Influence of polymerization methods and priming agents on the bond strength between resin luting agents and gold alloy.
- Author
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Mika Furuchi, Momoko Shimada, Haruto Hiraba, Akihisa Kodaira, Akiko Hashiguchi, Atsushi Kamimoto, Furuchi, Mika, Shimada, Momoko, Hiraba, Haruto, Kodaira, Akihisa, Hashiguchi, Akiko, and Kamimoto, Atsushi
- Subjects
DENTAL cements ,GOLD alloys ,BOND strengths ,FLEXURAL strength testing ,FLEXURAL strength - Abstract
Purpose: To evaluate the influence of polymerization methods and a metal priming agent on the bond strength between gold alloy for metal ceramic restorations and dual-cure-type resin luting agents, and on the strength and hardness of the luting agents.Methods: A total of 154 disks cast by a gold alloy were treated with or without a metal priming agent. One of the three luting agents was applied on the disk. The luting agent was either chemically or dual-polymerized. The shear bond strength was measured both before and after thermocycling. In addition, scanning electron microscope (SEM) observation, flexural strength test, and Knoop hardness test were performed.Results: Significant differences among the luting agents were observed in terms of bond strength and flexural strength. Significant differences between chemically and dual-polymerized luting agents were observed regarding shear bond strength, flexural strength, and Knoop hardness before thermocycling. The application of the priming agent was effective only for a luting agent.Conclusion: Both bond strength and flexural strength differed among three luting agents. The effect of the priming agent on bond strength differed among the luting agents. Both the bond and flexural strength of a chemically polymerized luting agent differed before or after thermocycling. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
29. Diagnostic Tool Using the Diagnostic Criteria for Temporomandibular Disorders: A Randomized Crossover-Controlled, Double-Blinded, Two-Center Study.
- Author
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Young, Andrew, Gallia, Samantha, Ryan, John F., Atsushi Kamimoto, Korczeniewska, Olga A., Kalladka, Mythili, Khan, Junad, and Noboru Noma
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DECISION trees ,HOSPITAL medical staff ,RESEARCH methodology evaluation ,RANDOMIZED controlled trials ,BLIND experiment ,DESCRIPTIVE statistics ,TEMPOROMANDIBULAR disorders ,STATISTICAL sampling ,CROSSOVER trials ,DATA analysis software - Abstract
Aims: To assess the speed and accuracy of a checklist user interface for the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD). Methods: A diagnostic tool formatted as a checklist was developed and compared to an existing diagnostic tool, the DC/TMD diagnsostic decision trees. Both types of tools use the DC/TMD and were tested by dental students, interns, and residents in the USA and Japan for diagnosis of hypothetical patients. The comparisons were done in a randomized, crossover, controlled, double-blinded trial. Results: Overall, subjects using the experimental tool answered 25% more correct diagnoses (P < .001) and missed 27% fewer diagnoses (P < .01). They were also able to finalize their diagnoses faster than those using the control tool, in 16% less time (P < .05). The difference in accuracy was more pronounced in complex cases, while the difference in speed was more pronounced in simple cases. Conclusion: This checklist is an alternative user interface for the DC/TMD. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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30. Correlations between clinical parameters in implant maintenance patients: analysis among healthy and history-of-periodontitis groups
- Author
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Shinya Nakabayashi, Naoki Tanabe, Yoshiyuki Hagiwara, Keisuke Seki, and Atsushi Kamimoto
- Subjects
0301 basic medicine ,Plaque index ,Dental implant ,Maintenance ,medicine.medical_treatment ,Bleeding on probing ,lcsh:Medicine ,Dentistry ,Severe periodontitis ,03 medical and health sciences ,0302 clinical medicine ,Probing depth ,medicine ,In patient ,Rank correlation ,Periodontitis ,business.industry ,Research ,lcsh:R ,030206 dentistry ,medicine.disease ,Correlation ,lcsh:RK1-715 ,030104 developmental biology ,lcsh:Dentistry ,Implant ,medicine.symptom ,business ,Modified plaque index - Abstract
The pathophysiology and pathology of peri-implantitis remain unclear; however, its similarity to periodontitis has been described. The evaluation of peri-implant tissue and the diagnostic criteria of peri-implant disease are not currently standardized as they are for periodontitis. In this study, we evaluated clinical parameters during the implant maintenance period to determine significant correlations between these parameters. We examined 55 implant patients at the time of maintenance visits between April and September 2016 and classified patients into a healthy group (H) and a history-of-periodontitis group (HP). For each implant, we evaluated the modified plaque index, probing pocket depth, and bleeding on probing as clinical parameters. Statistical analyses were performed with Spearman’s rank correlation coefficient. A total of 130 implants were assessed. The mean time since implant placement was 6 years and 6 months. The prevalence of implant-based peri-implantitis was 10.8% of all the implants. All cases of implant-based peri-implantitis came from the HP group, and many were present in patients with a history of severe periodontitis. The probing pocket depth around the implant was significantly greater in the HP group than in the H group. We found weak positive correlations between the probing pocket depth and bleeding on probing (r s = 0.401, p
- Published
- 2017
31. Fabrication of titanium restoration by means of calcium aluminate-bonded magnesia investment material and one-chamber arc casting apparatus.
- Author
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Mika Furuchi, Yoshimasa Takeuchi, Atsushi Kamimoto, Hideo Matsumura, Hideyuki Imai, Hiroyasu Koizumi, Furuchi, Mika, Takeuchi, Yoshimasa, Kamimoto, Atsushi, Matsumura, Hideo, Imai, Hideyuki, and Koizumi, Hiroyasu
- Subjects
TITANIUM ,DENTAL metallurgy ,NATIONAL health insurance ,MAGNESIUM oxide ,INVESTMENT casting ,DENTAL materials ,CALCIUM compounds ,DENTAL casting ,ALUMINUM compounds ,MATERIALS testing ,SURFACE properties - Abstract
Cast titanium restoration for molars has high biocompatibility and is covered by the Japanese national health insurance. Titanium casting requires specific investment material and casting apparatus. A cast restoration for the mandibular left second molar was fabricated using titanium in this study. A wax pattern fabricated on a definitive cast was invested in calcium aluminate-bonded magnesia investment material. Titanium was cast using an argon gas pressure one-chamber casting apparatus. No defects were observed on the surface and the hole was clearly reproduced. A smooth surface on the restoration was obtained by polishing at low speed. Reproductivity and polishing properties of the titanium restoration fabricated in this study were comparable to those of conventional dental metal restorations. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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32. Saliva-based PCR tests for SARS-CoV-2 detection.
- Author
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Yoshimasa Takeuchi, Mika Furuchi, Atsushi Kamimoto, Kazuya Honda, Hideo Matsumura, Ryutaro Kobayashi, Takeuchi, Yoshimasa, Furuchi, Mika, Kamimoto, Atsushi, Honda, Kazuya, Matsumura, Hideo, and Kobayashi, Ryutaro
- Abstract
The outbreak of novel coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread worldwide. Nasopharyngeal swabs are widely used in polymerase chain reaction (PCR) test to detect SARS-CoV-2. However, the collection of nasopharyngeal swabs has a series of drawbacks concerning exposure of healthcare staff, difficulty in collection, and discomfort of patients. Therefore, an alternative noninvasive sample for diagnostic of emerging viral diseases is required. The usefulness of saliva screening tests is compared to conventional swab tests in this report. The results suggest that saliva could be a reliable sample for detecting SARS-CoV-2. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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33. Influence of Surface Pretreatment on the Bond Strength of a Resin Luting Cement to Saliva-contaminated Enamel and Dentin.
- Author
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Iwama H, Ishii R, Takamizawa T, Aoki R, Watanabe S, Hayashi K, Kamimoto A, and Miyazaki M
- Subjects
- Cattle, Animals, Humans, Dental Stress Analysis, Temperature, Time Factors, Acid Etching, Dental methods, Stress, Mechanical, Dentin-Bonding Agents chemistry, Phosphoric Acids, Aluminum Oxide chemistry, Stainless Steel chemistry, Dental Enamel, Dentin, Dental Bonding methods, Saliva chemistry, Saliva metabolism, Resin Cements chemistry, Surface Properties, Shear Strength, Materials Testing
- Abstract
Objectives: This study aimed to evaluate the influence of surface pretreatment on the shear bond strength (SBS) of a resin luting cement to enamel and dentin with saliva contamination. The surface free energies (SFE) of the adherent surfaces were also determined., Methods and Materials: Bovine enamel and dentin were used in this study. For the saliva-contamination, human saliva was applied to the adherent surface for 60 seconds and then air-dried, and the specimens without saliva contamination served as controls. One group of contaminated surfaces was untreated (SC), and the others were pretreated with Katana Cleaner (KC), Multi Etchant (ME), or Ultra-Etch (UE). Fifteen specimens were prepared to measure the SBS for each test group.The mixed resin luting cement paste was applied to the alumina-blasted surface of a stainless-steel rod and placed on the prepared tooth surface. The luting cement was light irradiated for 40 seconds. The bonded specimens were stored for 24 hours at 37°C and half of the bonded specimens underwent 10,000 thermal cycles. The SBS and SFE of the specimens after different pre-treatments were measured., Results: The two-way ANOVA revealed that the factors of pretreatment agent and storage condition had a significant effect on the SBS to enamel and dentin. The SFE values of the SC group were significantly lower than those of the other groups in both enamel and dentin. The SFE of pretreated surface was material dependent., Conclusions: A pretreatment agent containing functional monomers was shown to be effective in removing saliva contaminants and in creating an effective bonding surface for the resin luting cement., (©Operative Dentistry, 2024.)
- Published
- 2024
- Full Text
- View/download PDF
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