Análise comparativa da resistência de união e à compressão de cimentos biocerâmicos utilizados em procedimentos de endodontia regenerativa
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2021-01-12
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Universidade Federal de Goiás
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Objective: To compare the bond strength to root dentin by means of the mechanical push-out test and the compressive strength of BIODENTINE®, MTA REPAIR HP® and BIO-C REPAIR® bioceramic cements. Materials and methods: For the test of bond strength to root dentin, 18 uniradicular lower premolars were used, sectioned 5.0 mm below the cemento-enamel junction (JCE). Cervical preparations were performed with a Largo # 1, # 2, # 3, # 4, # 5 and # 6 drill and the intracanal medication used was the antibiotic double paste, which remained in the root canal for 21 days. After removing the intracanal medication, the roots were cross-sectioned to obtain 1 mm thick dentin discs, consisting of 3 samples per tooth. Next, the 54 dentin discs were randomly divided into 3 experimental groups (n = 18) for insertion of the following bioceramic cements: Group 1 - BIODENTINE®; Group 2 - MTA REPAIR HP®; and, Group 3 - BIO-C REPAIR®. Cements were handled according to the manufacturers' recommendations and inserted into the root canal of each specimen placed on a glass plate, and subsequently kept in an oven at 37ºC and 100% relative humidity for 7 days. After the storage period, the mechanical push-out test was performed and the specimens were analyzed in the stereomicroscope with a 3x magnification to determine the failure pattern. For the compressive strength test, specimens (n = 10) of each of the bioceramic cements evaluated were made, with dimensions of 6 mm in height x 3 mm in diameter, these were stored in an oven at 37 ° C and 100% relative humidity for 7 days. After the storage period, the specimens were taken to the test device of the Universal Testing Machine to perform the test. The data were analyzed using the Shapiro-Wilk normality test. In the mechanical push-out test, the Kruskal-Wallis non-parametric test was used and multiple comparisons were performed using the Friedman test, with the failure pattern presented as a percentage. In the compressive strength test, the ANOVA test was used and multiple comparisons were performed using the Tukey test. The level of significance was set at 0.05%. Results: For the bond strength to root dentin, the bioceramic cement BIODENTINE® performed better than MTA REPAIR HP® and BIO-C REPAIR®, however, the difference was only statistically significant between the BIODENTINE® and BIO-C groups. REPAIR® (p = 0.0001). In the BIODENTINE® group, the most frequent failure pattern was mixed (61%), to the detriment of cohesive (33%) and adhesive failures (6%). On the other hand, in the MTA REPAIR HP® group, adhesive failures (94%) and only (6%) of mixed failures were observed more frequently, with no cohesive failures. Likewise, the BIO-C REPAIR® group did not present cohesive failures, but showed a higher prevalence of adhesive failures (72%) and a greater number of mixed failures (28%) when compared to MTA REPAIR HP®. With respect to
compressive strength, the bioceramic cement BIODENTINE® showed greater resistance to compression than MTA REPAIR HP® and BIO-C REPAIR®, this difference being statistically significant (p <0.05). Conclusion: Bioceramic cement BIODENTINE® showed higher values of bond strength to root dentin and compressive strength, however for the push-out test this difference was statistically significant only for BIO-C REPAIR® cement.
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RODRIGUES, M. N. M. Análise comparativa da resistência de união e à compressão de cimentos biocerâmicos utilizados em procedimentos de endodontia regenerativa. 2021. 52 f. Dissertação (Mestrado em Ciências da Saúde) - Universidade Federal de Goiás, Goiânia, 2021.