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19. Efecto del tamaño de vóxel de micro-CT en la evaluación de la preparación del conducto radicular

Author

Pinto, Jader Camilo, Lucas-Oliveira, Everton, Bonagamba, Tito Jose, Guerreiro-Tanomaru, Juliane Maria, and Tanomaru-Filho, Mario

Subjects
Cavidad de la pulpa dental, Instrumentos de níquel y titanio, Root canal preparation, Building and Construction, Dental pulp cavity, Microtomografía de rayos X, Endodontics, Endodoncia, Dentina, Preparación de Conductos radiculares, X-ray microtomography, Dentin, Root canal, Electrical and Electronic Engineering
Abstract

The aim of this study was to assess the influence of micro-computed tomography (micro-CT) voxel size on evaluation of root canal preparation using rotary heat-treated nickel-titanium files. Curved mesial root canals of mandibular molars were prepared using ProDesign Logic 30/.05 (PDL) or HyFlex EDM 25/.08 (HEDM) (n=12). The specimens were scanned using micro-CT with 5μm of voxel size before and after root canal preparation. Images with sub-resolution of 10 and 20μm voxel sizes were obtained. The percentage of volume increase, debris and uninstrumented root canal surface were analyzed in the different voxel sizes. Data were compared using unpaired Student’s t-test and ANOVA statistical tests (α=0.05). No differences were observed for percentage of volume increase, debris and instrumented surface between the root canals prepared by PDL and HEDM (p>0.05). Both systems promoted higher percentage of debris in the apical third compared to the middle third (p0.05). PDL and HEDM had similar root canal preparation capacity. Micro-CT images using different voxel sizes did not influence the results of volume increase and debris evaluation. However, images at 5µm showed greater accuracy to evaluate the percentage of uninstrumented surfaces. El objetivo de este estudio fue evaluar la influencia del tamaño de vóxel de la microtomografía computarizada (micro-CT) en la evaluación de la preparación del conducto radicular utilizando limas rotatorias de níquel-titanio tratadas térmicamente. Se prepararon conductos radiculares mesiales curvos de molares mandibulares usando ProDesign Logic 30/.05 (PDL) o HyFlex EDM 25/.08 (HEDM) (n=12). Las muestras se escanearon usando micro-CT con un tamaño de vóxel de 5μm antes y después de la preparación del conducto radicular. Se obtuvieron imágenes con subresolución de vóxeles de 10 y 20μm. Se analizó el porcentaje de aumento de volumen, residuos y superficie del conducto radicular no instrumentado en diferentes tamaños de vóxel. Los datos se compararon usando la prueba t de Student no pareada y las pruebas estadísticas ANOVA (α=0,05). No se observaron diferencias en el porcentaje de aumento de volumen, detritus y superficie instrumentada entre los conductos radiculares preparados por PDL y HEDM (p>0,05). Ambos sistemas promovieron un mayor porcentaje de detritos en el tercio apical en comparación con el tercio medio (p0,05). PDL y HEDM tenían una capacidad de preparación del conducto radicular similar. Las imágenes de micro-CT que utilizan diferentes tamaños de vóxel no influyeron en los resultados de la evaluación del volumen y los desechos. Sin embargo, las imágenes de 5µm mostraron una mayor precisión al evaluar el porcentaje de superficies no instrumentadas.

Published
2023
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21. Effect of radiopacifier and liquid in the physicochemical and biological properties of calcium silicate clinker Angelus: A laboratory investigation.

Author

Tanomaru‐Filho, Mário, de Oliveira, Bruna Vasconcellos, Tavares, Karina Ines Medina Carita, Rodrigues, Elisandra Márcia, Torres, Fernanda Ferrari Esteves, and Guerreiro‐Tanomaru, Juliane Maria

Subjects
CALCIUM silicates, LIQUIDS, DISTILLED water, RADIOPACITY, DENTAL materials
Abstract

The aim of this study was to evaluate the effect of radiopacifier calcium tungstate and manipulation with distilled water (DW) or liquid with additives (LA) on calcium silicate clinker Angelus (CL) properties, compared with MTA (Angelus, Brazil) and MTA Repair HP (MTAHP, Angelus, Brazil). The physicochemical properties, cellular viability and bioactivity were evaluated. ANOVA/Tukey and Bonferroni tests were performed (α = 0.05). There was no difference in material setting time (p > 0.05). MTA and MTAHP were similar (p > 0.05) and had greater radiopacity than CL + DW and CL + LA (p < 0.05). All experimental materials showed mass increase, alkalinisation capacity, besides biocompatibility and bioactivity at 3 and 7 days. The different liquids had no influence in the biological properties and bioactivity of the calcium silicate clinker Angelus. Calcium tungstate provided radiopacity, without changing the setting time, maintaining the mass increase and alkalinisation ability of the calcium silicate materials. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Participation of fibroblast growth factor‐1 and interleukin‐10 in connective tissue repair following subcutaneous implantation of bioceramic materials in rats.

Author

Delfino, Mateus Machado, Jampani, José Leandro de Abreu, Lopes, Camila Soares, Guerreiro‐Tanomaru, Juliane Maria, Tanomaru‐Filho, Mário, Sasso‐Cerri, Estela, and Cerri, Paulo Sérgio

Subjects
CONNECTIVE tissues, INTERLEUKIN-10, FIBROBLASTS, SPRAGUE Dawley rats, TUKEY'S test
Abstract

Aim: To evaluate whether the bioceramic materials Bio‐C Pulpo (Bio‐C, Angelus) and mineral trioxide aggregate (MTA) Repair HP (MTA‐HP, Angelus) induce fibroblast proliferation and release of interleukin‐10 (IL‐10), an anti‐inflammatory cytokine, stimulating connective tissue remodelling. The tissue response of Bio‐C and MTA‐HP was compared with the White MTA (WMTA; Angelus) since studies have demonstrated that WMTA induces tissue repair. Methodology: Bio‐C, MTA‐HP and WMTA were inserted into polyethylene tubes and implanted in the subcutaneous tissue of Holtzman rats for 7, 15, 30 and 60 days. As a control group (CG), empty tubes were implanted subcutaneously. The number of fibroblasts (FB), Ki‐67‐, fibroblast growth factor‐1‐ (FGF‐1) and IL‐10‐immunolabelled cells and collagen content in the capsules was obtained. The data were subjected to two‐way anova followed by Tukey's test (p ≤.05). Results: At 7 days, significant differences in the number of FB were not detected amongst Bio‐C, MTA‐HP and WMTA groups (p ˃.05). The capsules of all groups exhibited a significant increase in the number of FB and content of collagen over time. From 7 to 60 days, a significant reduction in the number of FGF‐1‐ and Ki‐67‐immunolabelled cells was seen in the capsules of all specimens. In all periods, no significant difference in the number of FGF‐1‐immunolabelled cells was detected between Bio‐C and CG specimens. At 60 days, significant differences in the immunoexpression of FGF‐1 were not observed amongst the groups. At 7 and 15 days, the highest immunoexpression for Ki‐67 was present in Bio‐C specimens whilst, after 30 and 60 days, no significant difference was observed amongst the bioceramic materials. At 7 days, few IL‐10 immunolabelled cells were present in the capsules of all specimens whereas, at 60 days, a significant increase in the IL‐10‐immunostaining was present in all groups. At 60 days, the Bio‐C, MTA‐HP and WMTA groups showed a greater number of IL‐10‐immunolabelled cells than in the CG specimens (p <.0001). Conclusions: Bio‐C, MTA‐HP and WMTA stimulate fibroblast proliferation, leading to the formation of collagen‐rich capsules. FGF‐1 and IL‐10 may mediate the remodelling of capsules around Bio‐C, MTA‐HP and WMTA bioceramic materials. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Different formulations of peracetic acid: effects on smear layer removal, dentine erosion, cytotoxicity and antibiofilm activity

Author

Viola, Kennia Scapin, primary, Coaguila-Llerena, Hernán, additional, Rodrigues, Elisandra Marcia, additional, Santos, Cíntia Silva, additional, Chávez-Andrade, Gisselle Moraima, additional, Magro, Miriam Graziele, additional, Tanomaru-Filho, Mario, additional, Guerreiro-Tanomaru, Juliane Maria, additional, and Faria, Gisele, additional

Published
2022
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