Physical properties and interfacial adaptation of three epoxy resin-based sealers.

INTRODUCTION: The aim of the study was to evaluate the radiopacity, solubility, flow, film thickness, setting time, and adaptation to the root canal walls of 3 epoxy resin-based sealers: AH Plus, Acroseal, and Adseal. METHODS: Physical tests were performed following American National Standards Institute/American Dental Association's requirements. For interfacial adaptation analysis, 30 maxillary canines were shaped by using ProTaper instruments. The specimens were divided into 3 groups (n = 10): group 1, AH Plus; group 2, Acroseal; and group 3, Adseal. The sealers were mixed with rhodamine B dye, and the canals were filled by using the lateral compaction technique. The percentage of gaps and voids area was calculated at 2, 4, and 6 mm levels from the apex. Statistical evaluation was performed by using analysis of variance for physical analysis and nonparametric Kruskal-Wallis and Dunn tests for interfacial adaptation (P < .05). RESULTS: No statistical differences were found for adaptation, percentage of voids, solubility, flow, and film thickness among the sealers (P > .05). AH Plus was significantly more radiopaque (P < .05). For the setting time, there were statistical differences among all the studied sealers (P < .05). CONCLUSIONS: AH Plus, Acroseal, and Adseal presented similar root canal adaptation, solubility, flow, and film thickness. Statistical differences were found for radiopacity and setting time (P < .05).

Comparação dos debris produzidos após instrumentação pelos sistemas waveone e protaper em canais mesiais de molares inferiores / Comparison of hard-tissue debris produced by wave one and protaper instruments on mesial roots of mandibular molars.

Objetivo: O preparo biomecânico tem como objetivo promover a limpeza, antissepsia e modelagem do sistema de canais radiculares favorecendo a eliminação de bactérias e seus produtos, tecido pulpar vivo ou degenerado, dentina, e debris dentinários contaminados, criando um espaço adequado para a obturação do sistema de canais radiculares. O presente estudo teve como objetivo comparar os sistemas Protaper e Waveone na produção de debris dentinários no interior do canal e a compactação de debris na região de istmos em raízes mesiais de molares inferiores. Material e Métodos: Foram selecionados 20 raízes mesiais de molares inferiores de dentes humanos. A instrumentação dos canais foi realizada com o sistema Protaper e WaveOne de acordo as especificações do fabricante. O volume de irrigante total empregado foi de 21 e 16 ml respectivamente. Em seguida, os dentes foram seccionados em planos transversais a 2,4 e 6mm do ápice e analisadas mediante estereomicroscopia com magnificação de 40 X. Qualquer material presente no interior do canal ou itsmo foi quantificado como debris. Resultados: Não houve diferença estatisticamente significante (p<0.05) na acumulação de debris em todas as secções. Protaper obteve maior porcentagem de limpeza de istmos em todas as secções, Conclusão: Os resultados sugerem que o volume de irrigação parece não ter influência na remoção de debris do interior do canal, mas sim na limpeza de istmos.

Aim: Biomechanical preparation aims to promote cleaning and shaping of the root canal system, bacteria and their products, live or degenerated pulp tissue, dentin, and contaminated dentin debris, creating adequate space for the obturation of the root canal system. The present study aimed to compare the Protaper and Waveone systems on the production of dentinal debris inside the canal and compression of debris in the area of isthmuses in mesial roots of mandibular molars. Material and Methods:Twenty mesial roots of mandibular molars of human teeth where selected. The instrumentation of the canals was performed with Protaper and WaveOne system according to the manufacturer's specifications. The total volume of irrigant employed was 21 and 16 ml respectively. Then, the teeth were sectioned in transverse sections at 2, 4 and 6mm from the apex and analyzed by stereomicroscopy with a magnification of 40 X. Any material present within the canal or isthmus was quantified as debris. Results: No statistically significant differences (p <0.05) in the accumulation of debris in all sections were found. Protaper had a higher percentage of cleaning isthmuses in all sections, Conclusions: The results suggest that the volume of irrigation seems to have no influence on the removal of debris from the interior of the canals, although, showed betteristhmus cleaning.