Interfacial adaptation of the Epiphany self-adhesive sealer to root dentin.

OBJECTIVE: The present study was designed to investigate interfacial quality between both Epiphany and Epiphany SE and the surrounding dentin having conventional gutta-percha/AH plus root filling as reference for comparison. STUDY DESIGN: A sample of 36 human maxillary canines was prepared and assigned to experimental groups of 12 teeth each, designated as G1, Resilon/Epiphany; G2, Resilon/Epiphany SE; and G3, gutta-percha/AH Plus. After the filling procedures, each specimen was horizontally sectioned at 3, 6, and 8 mm from the apex and a metallographic preparation was performed to enable the evaluation under Confocal Laser Scanning Microscopy (CLSM). The integrity of the interface was determined by calculating the ratio between the total sealer/dentin interface and the sealer/dentin interface that presented gap-containing regions. Additionally, the width of each gap was measured and pooled per each specimen for comparison. Statistical analysis was performed using nonparametric methods. RESULTS: Nonbonding AH Plus/gutta-percha root fillings showed a significantly higher amount of gap-free regions (P < .05). In the same way, nonbonding AH plus root fillings displayed significantly narrower gaps compared with the 2 adhesive root-filling groups (P < .05). CONCLUSIONS: Under the present in vitro conditions, the quality of the interfacial adaptation of the current adhesive root fillings is compromised even when teeth with simple anatomic features were obturated under well-monitored laboratory conditions.

Comparação ex vivo da extrusão de restos dentinários sobduas técnicas de instrumentação dos canais radiculares / An ex vivo comparison of apically-extruded dentinedebris using two instrumentation techniques

O presente estudo teve como objetivo avaliar, ex vivo, a quantidade de dentina extruída após o preparo químico-mecânico de canais radiculares, quando do emprego de duas técnicas de instrumentação. Quarenta canais mésio-vestibulares de raízes de molares inferiores queapresentavam comprimento aproximado de 15 mm foram selecionados, divididos aleatoriamente em dois grupos experimentais de 20 raízes cada e instrumentados, utilizando-se duas técnicas distintas, porém ambas baseadas no princípio coroa-ápice (Técnica de Oregon atualizada e Profile Série 29 Taper.04). Para a coleta do material extruído foi confeccionado um dispositivo em plástico PVC, apresentando na sua porção inferior um filtro de papel que, com auxílio de uma balança de precisão, era pesado antes e após a instrumentação. Mediante a obtenção dos valores de peso inicial e final do filtro, foi possível calcular o peso do material extruído. O peso das raspas de dentina dos canais instrumentados pela técnica de Oregon atualizada variou entre 0,0000 g e 0,0040 g, commédia de 0,0009 g; e nos canais instrumentados com Profile Série 29 Taper.04, a variação foi de 0,0000 a 0,0060 g, com média de 0,0017 g. Os dados foram tratados estatisticamente pelo teste t-Student, que revelou diferenças significantes (p< 0,05). Diante dos resultados obtidos pode-se concluir que a técnica de Oregon atualizada demonstrou maior quantidade de dentina extruída em relação à técnica Profile Série 29 Taper.04.

The present study aimed to compare ex vivo, the amount of extruded dentin after chemico-mechanical preparation of the root canal system, using two instrumentation techniques. Forty mesio-buccal roots of mandibular molars, having 15 mm in length were selected and randomlydivided into 2 experimental groups with 20 samples each. Teeth were instrumented using two crown-down distinct techniques (actualized Oregon Technique and Profile Series 29 Taper.04). Extruded material was collected through a PVC plastic apparatus, with a paper filter in its lowerportion, which was weighted before and after the instrumentation. The extruded material weight was calculated assessing the initial weight and the post-instrumentation weight. Dentin debris form root canals instrumented by Oregon technique showed weight varying from 0,0000 g to 0,0040 g, with a mean of 0,0009 g; and the root canals instrumented with Profile Série 29 Taper.04, the variation was from 0,0000 to 0,0060 g, with a mean of 0,0017 g. Data were statistically treated with t-Student test, that revealed significant differences (p < 0,05). From the results obtained it may be concluded that the Oregon technique demonstrated higher amount of extruded dentin than the Profile Series 29 Taper.04 technique.

Sealing ability of oval-shaped canals filled using the System B heat source with either gutta-percha or Resilon: an ex vivo study using a polymicrobial leakage model.

OBJECTIVE: The present study systematically compared the sealing ability of oval-shaped canals filled using the System B heat source with either gutta-percha/sealer or Resilon/Epiphany. STUDY DESIGN: Eighty mandibular incisors with oval-shaped canals were selected after buccolingual and mesiodistal radiographs and divided into 3 experimental groups (n = 20). The teeth were obturated as follows: G1: gutta-percha/Pulp Canal Sealer EWT using cold lateral condensation; G2: gutta-percha/Pulp Canal Sealer EWT using the System B heat source; and G3: Resilon tips and Epiphany sealer using the System B heat source. The roots were mounted in a bacterial leakage model and the system was checked daily during the following 9 weeks. The log rank test was used to analyze the leakage data at intervals of 3, 6, and 9 weeks. The level of significance was set at P < .05. RESULTS: Seven samples of G1 (35%) and 5 samples (20%) each of G2 and G3 were fully contaminated after 9 weeks. Data showed no significant difference between traditional gutta-percha/sealer and Resilon/Epiphany (P > .05). However, both materials showed significant difference to cold lateral condensation when System B heat source was used (P < .05). CONCLUSIONS: The results demonstrated that Resilon/Epiphany combination do not improve the bacterial leakage resistance compared with traditional gutta-percha/sealer fillings.