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299 results on '"Negrutiu, Meda"'

2. THE EVALUATION OF THE PROSTHETIC PREPARATIONS FINISH LINES FOR PROVISIONAL CROWNS WITH THE IMPACT ON PERIODONTAL HEALTH.

Author

Hategan, Simona Ioana, Belea, Alina-Luminita, Tanase, Alina Doina, Gavrilovici, Andrei-Mihai, Petrescu, Emanuela-Lidia, Marsavina, Liviu, Sinescu, Cosmin, Negrutiu, Meda-Lavinia, and Manole, Marius-Ciprian

Subjects
NUMERICAL analysis, HEALING, TEETH, FEATHERS, METALS
Abstract

Aim of the study: The aim of this study is to evaluate the resistance of different marginal fit geometries for a provissional fixed dental prothesis, which can have an impact on the periodontal health. Materials and methods: Acording to the principles of the tooth preparation, four types of marginal design were made: feather edge, rounded shoulder, chamfer and heavy chamfer. Using a direct technique, prepared teeth were poured into metal abutments, temporary composite resin crowns were made and cemented. All four abutments were analyzed using theoretical and experimental methods. Results: The results obtained from the mechanical tests were more reliable than those obtained from numerical analyses. A chamfer marginal finish line a pre prosthetic periodontal therapy can have greater impact on the soft tissue healing process. Conclusions: These preliminary studies enhance the idea of differentiating preparations for distinctive alternative prosthetic treatment plans. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Crystalline Structure Assessment of Ceramic Veneered Co-Cr-W Dental Alloy Substructures Obtained by Selective Laser Melting—A Pilot Study

Author

Stoian, Caius, primary, Ardelean, Lavinia Cosmina, additional, Negrutiu, Meda Lavinia, additional, Miclau, Marinela, additional, Casut, Cristian, additional, Sinescu, Cosmin, additional, Alexandratou, Anastasia, additional, Katsavrias, Athanasios, additional, Stoian, Alexandra Denisa, additional, and Rominu, Mihai, additional

Published
2023
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8. MODERN APPROACHES FOR UPPER LABIAL FRENULUM SURGERY.

Author

Nica, Diana Florina, Rivis, Mircea, Nicoara, Adrian, Roi, Ciprian Ioan, Pricop, Marius, Sinescu, Cosmin, Negrutiu, Meda-Lavinia, and Talpos, Serban

Subjects
WOUND healing, ACTIVE medium, CARBON dioxide lasers, HIGH power lasers, LIPS, PERIOSTEUM, SENSORY receptors, HUMAN papillomavirus
Published
2023

9. Methods of dental shade determination

Author

Serban, Christa, Nteroli, Gianni, Craciunescu, Emanuela L., Negrutiu, Meda Lavinia, Serban, Helmine, Duma, Virgil-Florin, Bradu, Adrian, Podoleanu, Adrian G. H., Sinescu, Cosmin, Rechmann, Peter, and Fried, Daniel

Subjects
TA1520
Abstract

Dental shade determination and seamless integration of restorative work in the oral cavity are challenging and important tasks in the everyday clinical dental practice. The aim of this in-vitro study was to evaluate comparatively the capability of software-based color analysis of mobile phone photography, with the spectrophotometric and visual methods for dental shade determination. Visual shade determination of the incisal, middle, and cervical thirds parts of ten extracted human teeth was performed using the Vita Classical and Vita 3D Master stock shade guides. Shade determination of the thirds of each tooth was performed using the Vita Easyshade spectrophotometer. Subsequently, photographs of each tooth were captured using a mobile phone camera. Color charts were produced using an in-house image processing technique, and the tooth color captured by the mobile phone photography was matched to the shade guides. The results show that the camera-based method had better agreement with the spectrophotometric and visual methods when the Vita Classical shade guide was employed. Software-based color analysis of mobile phone photography should be further explored for its use as an affordable potential tool for increasing objectivity and accuracy in dental shade determination.

Published
2022

11. Comparative Assessment of the Shaping Ability of Reciproc Blue, WaveOne Gold, and ProTaper Gold in Simulated Root Canals

Author

Orel, Laura, primary, Velea-Barta, Oana-Alexandra, additional, Sinescu, Cosmin, additional, Duma, Virgil-Florin, additional, Nica, Luminița-Maria, additional, Horhat, Razvan Mihai, additional, Chirila, Raul Dorin, additional, Tudor, Anca, additional, Vulcănescu, Dan-Dumitru, additional, and Negrutiu, Meda Lavinia, additional

Published
2022
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13. The use of thermal imaging in evaluating musculoskeletal disorders in dentists

Author

Cosoroaba, Mioara-Raluca, Cirin, Liviu, Anghel, Mirella Dorina, Talpos-Niculescu, Cristina Ioana, Argesanu, Veronica, Farkas, Andrei Zoldan, and Negrutiu, Meda Lavinia

Subjects
Diagnostic Imaging, Occupational Diseases, dentistry, ergonomics, Dentists, Temperature, Humans, Original Article, Musculoskeletal Diseases, musculoskeletal disorders, posture, thermography
Abstract

Musculoskeletal disorders (MSDs) caused by incorrect working positions among dentists is a serious health issue and one that leads to decreased productivity and quality of life. Muscle activity and strain is correlated with higher surface temperatures due to increased metabolic activity [2]. The main objective of this study is to evaluate, using thermal imaging, the muscular strain experienced by oral healthcare professionals during work depending on their position, and to assess whether periodic stretching exercises have an impact on preventing MSDs. The study included four subjects and used thermal imaging to evaluate the heat pattern produced by muscle strain in two different states, one while working in incorrect postures and the other after performing stretching exercises. We used a FLIRB200 thermal imaging camera to measure skin surface temperature changes of the underlining muscles in the cervical, right arm triceps, and lumbar areas. According to the imaging, all four subjects recorded a drop in temperature in evaluated muscle regions after performing stretching exercises, corresponding to a decrease in muscle strain. Thermal imaging can be effectively used to evaluate muscle strain and MSDs. Stretching exercises could be viewed as effective preventive measures to avoid MSDs caused by erroneous work postures, however, more subjects are required to draw a definite conclusion.

Published
2019

14. Evaluation of the Shaping Ability of Three Thermally Treated Nickel–Titanium Endodontic Instruments on Standardized 3D-printed Dental Replicas Using Cone-Beam Computed Tomography

Author

Orel, Laura, primary, Velea-Barta, Oana-Alexandra, additional, Nica, Luminita-Maria, additional, Boscornea-Pușcu, Andreea-Simona, additional, Horhat, Razvan Mihai, additional, Talpos-Niculescu, Roxana-Maria, additional, Sinescu, Cosmin, additional, Duma, Virgil-Florin, additional, Vulcanescu, Dan-Dumitru, additional, Topala, Florin, additional, and Negrutiu, Meda-Lavinia, additional

Published
2021
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15. En‑face optical coherence tomography analysis of gold and silver nanoparticles in endodontic irrigating solutions: An in vitro study

Author

Topala, Florin, primary, Nica, Luminita-Maria, additional, Boariu, Marius, additional, Negrutiu, Meda, additional, Sinescu, Cosmin, additional, Marinescu, Adrian, additional, Cirligeriu, Laura, additional, Stratul, Stefan-Ioan, additional, Rusu, Darian, additional, Chincia, Renato, additional, Duma, Virgil, additional, and Podoleanu, Adrian, additional

Published
2021
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18. Scaffold-Type Structure Dental Ceramics with Different Compositions Evaluated through Physicochemical Characteristics and Biosecurity Profiles

Author

Fabricky, Mihai M.C., primary, Gabor, Alin-Gabriel, additional, Milutinovici, Raluca Adriana, additional, Watz, Claudia Geanina, additional, Avram, Ștefana, additional, Drăghici, George, additional, Mihali, Ciprian V., additional, Moacă, Elena-Alina, additional, Dehelean, Cristina Adriana, additional, Galuscan, Atena, additional, Buzatu, Roxana, additional, Duma, Virgil-Florin, additional, Negrutiu, Meda-Lavinia, additional, and Sinescu, Cosmin, additional

Published
2021
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26. Evaluation of Dental Composite Resin Interface and Adhesion Using Laser Scanning Confocal Microscopy

Author

Stan, Adrian Tudor, primary, Vaduva, Adrian, additional, Negrutiu, Meda Lavinia, additional, Sinescu, Cosmin, additional, Szuhanek, Camelia, additional, Rogobete, Alexandru, additional, Muntean, Danina, additional, Talpos, Serban, additional, Duma, Virgil Florin, additional, Idorasi, Laura, additional, Hajaj, Tareq, additional, and Rominu, Mihai, additional

Published
2018
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29. Modern evaluation of the quality of the techniques of root canal dental obturation

Author

Todea, Carmen, Podoleanu, Adrian G.H., Duma, Virgil-Florin, Abuabboud, Lina, Nica, Luminita, Orel, Laura, Puscu, Simona, Negrutiu, Meda Lavinia, Sinescu, Cosmin, Todea, Carmen, Podoleanu, Adrian G.H., Duma, Virgil-Florin, Abuabboud, Lina, Nica, Luminita, Orel, Laura, Puscu, Simona, Negrutiu, Meda Lavinia, and Sinescu, Cosmin

Abstract

Background: One of the key factors for a successful endodontic therapy is to adequately fill the root canals. The aim of this in vitro study was to compare the quality of three different techniques of root canal obturation: tapered singlecone, cold lateral condensation, warm vertical condensation and injection system, using non-invasive Optical Coherence Tomography (OCT). Materials and methods: A total of 30 extracted single-rooted teeth, prepared with Reciproc System (VDW, silver Reciproc ) were divided into three groups, based on the filling method: the first group obturated with “single-cone” (n=10) Reciproc guttapercha single-cone tapered according to the diameter, length and conicity of the preparation, the second group obturated with cold lateral condensation (n=10) and the third group, “combined-system” (E&Q META BIOMED) (n=10). OCT technology can generate high-resolution cross-sectional imaging, capable to evaluate the micro-leakages of dental restorations and endodontic fillings. Results: OCT showed that none of the root canal filled teeth were gape-free; the highest percentage of filling material was observed in the combined system group (warm vertical and injection system). Conclusions: OCT represents a valuable method for investigation with high depth resolution which can be used for evaluation of endodontic fillings.

Published
2018

30. Biomimetic Tizian 'table tops' analyzed with swept source optical coherence tomography

Author

Todea, Carmen, Podoleanu, Adrian G.H., Duma, Virgil-Florin, Marcauteanu, Corina, Sinescu, Cosmin, Toader, Marius, Negrutiu, Meda Lavinia, Mitroi, Felicia Elena, Stoica, Eniko Tunde, Topala, Florin, Duma, Virgil Florin, Bradu, Adrian, Todea, Carmen, Podoleanu, Adrian G.H., Duma, Virgil-Florin, Marcauteanu, Corina, Sinescu, Cosmin, Toader, Marius, Negrutiu, Meda Lavinia, Mitroi, Felicia Elena, Stoica, Eniko Tunde, Topala, Florin, Duma, Virgil Florin, and Bradu, Adrian

Abstract

"Table tops"/occlusal veneers are partial crowns that allow for the biomimetic restoration of worn teeth in bruxing patients. The biomimetic approach includes a CAD/CAM composite resin for the manufacturing of the "table tops", for example Tizian, which is a zirconia reinforced composite (Schutz Dental Group). In the present study we prove the value of a fast swept source optical coherence tomography (SS-OCT) system in the evaluation of the marginal fit of Tizian "table tops". 12 maxillary first premolars were extracted and minimally invasive prepared for "table tops". The Tizian "table tops" were then adhesively cemented on the natural teeth with Variolink II (Ivoclar Vivadent). A SS-OCT system has been used to evaluate the marginal and internal adaptation of Tizian "table tops". The SS (Axsun Technologies, Billerica, MA) has a central wavelength of 1060 nm, a sweeping range 106 nm (quoted at 10 dB), and a 100 kHz line rate. The depth resolution of the system, measured experimentally in air was 10 ?m. The same samples were analyzed by using a micro-computed tomography (?CT) system, in order cu confirm the data obtained by using OCT. The imaging system used for this study offers good spatial resolutions in both directions, transversal and longitudinal, of around 10 ?m, a high sensitivity, and it is also able to acquire entire 3D volumes as fast as 2.5 s. Once the full dataset has been acquired, rendered high resolutions en-face projections could be produced. With it, the "table top" – cement – abutment tooth interfaces were observed on both C-scans as 2D images and also in the 3D reconstructions; the system was able to detect several open interfaces, which were confirmed on the ?CT i mages. The SS-OCT system allows for an efficient evaluation of biomimetic Tizian "table tops".

Published
2018

31. Optoelectronic evaluation of indirect dental veneers interfaces

Author

Todea, Carmen, Podoleanu, Adrian G.H., Duma, Virgil-Florin, Maroiu, Alexandra, Rominu, Mihai, Sinescu, Cosmin, Negrutiu, Meda Lavinia, Topala, Florin, Bradu, Adrian, Todea, Carmen, Podoleanu, Adrian G.H., Duma, Virgil-Florin, Maroiu, Alexandra, Rominu, Mihai, Sinescu, Cosmin, Negrutiu, Meda Lavinia, Topala, Florin, and Bradu, Adrian

Abstract

Dental indirect veneers have become the most functional and cost-effective method for providing high-aesthetic results whenever smile design enhancement is required. Yet, clinical failures have been reported due to the detachment of the veneers from the dental hard tissues, as well as to chipping and microleakage. Many experimental studies have been conducted in order to identify clinical and technical solutions for enhancing the adhesive and biomechanical properties of the veneers, by promoting the same classical, linear marginal contour of these particular indirect restorations. Thus, the aim of this study is to develop a novel design of the veneers deemed to augment the interfacial adhesive forces and, furthermore, to investigate the bonded interfaces by using optical coherence tomography.

Published
2018

32. Investigation of firing temperature variation in ovens for ceramic-fused-to-metal dental prostheses using swept source optical coherence tomography

Author

Todor, Raluca, Negrutiu, Meda-Lavinia, Sinescu, Cosmin, Topala, Florin Ionel, Bradu, Adrian, Duma, Virgil Florin, Rominu, Mihai, Podoleanu, Adrian Gh., Todor, Raluca, Negrutiu, Meda-Lavinia, Sinescu, Cosmin, Topala, Florin Ionel, Bradu, Adrian, Duma, Virgil Florin, Rominu, Mihai, and Podoleanu, Adrian Gh.

Abstract

One of the most common fabrication techniques for dental ceramics is sintering, a process of heating of the ceramic to ensure densification. This occurs by viscous flow when the firing temperature is reached. Acceptable restorations require the alloy and ceramic to be chemically, thermally, mechanically, and aesthetically compatible. Thermal and mechanical compatibility include a fusing temperature of ceramic that does not cause distortion of the metal substructure. Decalibration of ovens used for firing of the ceramic layers for metal ceramic dental prostheses leads to stress and cracks in the veneering material, and ultimately to the failure of the restoration. 25 metal ceramic prostheses were made for this study. They were divided in five groups, each sintered at a different temperature: a group at the temperature prescribed by the producer, two groups at lower and two groups at higher temperatures set in the ceramic oven. An established noninvasive biomedical imaging method, swept source (SS) optical coherence tomography (OCT) was employed, in order to evaluate the modifications induced when using temperatures different from those prescribed for firing the samples. A quantitative assessment of the probes is performed by en-face OCT images, taken at constant depths inside the samples. The differences in granulation, thus in reflectivity allow for extracting rules-of-thumb to evaluate fast, by using only the prostheses currently produced the current calibration of the ceramic oven. OCT imaging can allow quick identification of the oven decalibration, to avoid producing dental prostheses with defects.

Published
2018

33. Optical coherence tomography study regarding the enamel structure before and after debonding

Author

Todea, Carmen C., Podoleanu, A.G., Duma, Virgil-Florin, Szuhanek, Camelia, Sinescu, Cosmin, Todea, Carmen, Pop, Oana, Topala, Florin, Rominu, Mihai, Negrutiu, Meda Lavinia, Bradu, Adrian, Podoleanu, Adrian G.H., Todea, Carmen C., Podoleanu, A.G., Duma, Virgil-Florin, Szuhanek, Camelia, Sinescu, Cosmin, Todea, Carmen, Pop, Oana, Topala, Florin, Rominu, Mihai, Negrutiu, Meda Lavinia, Bradu, Adrian, and Podoleanu, Adrian G.H.

Abstract

Orthodontic treatments imply the use of different types of adhesives and brackets. However, concerns have been raised regarding the effect of these treatments on the structure of the involved teeth. The debonding process is especially regarded as a concern: due to the use of different pliers tensile and pulling forces the develop on the surface of the tooth. The finishing bur is also a concern. Optical Coherence Tomography (OCT), an emerging technology that performs transverse sections of biological systems has been used in order to obtain a more accurate assessment of enamel quality due to its wide applicability and to its non-invasive properties.OCT, analogous to ultrasound imaging(with the difference that it uses light instead of sound), provides cross-sectional images of the tissue structure on the micron scale, in vivo and in real time. Regarding fixed orthodontic treatments, patients are often subjected in the process to a high risk of enamel decalcification and carious processes. Demineralization usually occurs in the area adjacent to the orthodontic bracket location, where bacterial plaque control is difficult. Therefore, in this study we evaluate using OCT the degree of demineralisation produced in the enamel structure, following the removal of the orthodontic bracket. Also, the amount of adhesive remnants after the removal of the adhesive and the finishing of the dental surface with specific instrumentation is evaluated.

Published
2018

36. Orthodontic Mini-Implants Hybrid Expanders in Palatal Expansion

Author

Szuhanek, Camelia, primary, Nagib, Riham, additional, Sinescu, Cosmin, additional, Negrutiu, Meda Lavinia, additional, Manea, Nicoleta, additional, Buzatu, Roxana, additional, Dumitrescu, Stefania, additional, Mesaros, Anca, additional, Cocir, Razvan, additional, Schiller, Leonora, additional, and Sarbu, Adina, additional

Published
2018
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44. Determining the Biological Sealing Quality of the Implant-abutment Interface Using Streptococcus mutans in Both, Conical and Internal Hex Connections A comparative study

Author

Hajaj, Tareq, primary, Talpos, Serban, additional, Stoian, Caius, additional, Negrutiu, Meda Lavinia, additional, Szuhanek, Camelia, additional, Popa, Malina, additional, Stan, Adrian Tudor, additional, Zaharia, Cristian, additional, Hajaj, Karin Roxana, additional, Licker, Monica, additional, Muntean, Delia, additional, Ianes, Emilia, additional, and Sinescu, Cosmin, additional

Published
2018
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49. Implant Surgery Using Bio-compatible Guides

Author

Talpos, Serban, primary, Hajaj, Tareq, additional, Timofte, Costin, additional, Rivis, Mircea, additional, Streian, Felicia, additional, Popa, Malina, additional, Sinescu, cosmin, additional, Negrutiu, Meda Lavinia, additional, Stan, Adrian, additional, Zaharia, Cristian, additional, Szuhanek, Camelia, additional, Ianes, Emilia, additional, and Pricop, Marius, additional

Published
2018
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