ABSTRACT
Objective To compare the treatment effect of calcium hydroxide and formocresol applied in root canal disinfection after root canal preparation.Methods 283 patients with 388 teeth diagnosed as chronic periapical were selected.Calcium hydroxide and formocresol were applied after opening of pulp chamber,pulp removed and root canal preparation.Calcium hydroxide was piped into the root canal by screw conveyor to fill the root canal in calcium hydroxide group,and formocresol cotton twist was setted in the root canal after dried in formocresol group.Tampons and ZOE were used for temporary closure.Treatment effects in both groups were compared in a week.Results The total effective rate in calcium hydroxide group was 96.39％,while 79.90％ in formocresol group.The total effective rote in calcium hydroxide group was higher than that in formocresol group(x2 =53.792,P ＜ 0.05).Conclusion Calcium hydroxide was safe,periapical tissue irritation and reliable effect was reached.It was worthy of clinical application.
ABSTRACT
O objetivo deste estudo foi avaliar a infuência de dois espaçadores de calibres diferentes sobre o selamento da obturação endodôntica. Trinta e quatro dentes humanos unirradiculares extraídos foram preparados e divididos em dois grupos experimentais (n=15) e dois grupos controle (n=2). A obturação foi realizada por meio da técnica da condensação lateral, utilizando-se dos espaçadores B (grupo I) e D (grupo II) (Maillefer, Ballaigues, Switerland). Após 45 dias imersas em soro fisiológico, as raízes foram impermeabilizadas com duas camadas de esmalte vermelho para unhas, excetuando-se 1 mm apical, e em seguida colocadas em solução de azul de metileno a 2% por 72 horas a 37ºC. As amostras foram seccionadas no sentido longitudinal e a microinfltração ápice-coroa mensurada com lupa estereoscópica com aumento de 20x e analisada estatisticamente. Os resultados demonstraram não haver diferença signifcante entre os dois grupos.
The aim of this work was to evaluate the infuence of two endodontic spreaders with diferent calibers on lateral condensation seal. Thirty four human anterior teeth were used, from which four were for control groups. After instrumentation, they were randomly divided in two experimental groups (n=15). In group I root canal filling was done with spreader B and in group II with spreader D. After 45 days in saline solution, roots were covered with two layers of red finger nail, except for the last apical 1mm, put in 2% methylene blue dye for 72 hours at 37ºC and cut longitudinally. Microleakage was measured and statistically analyzed. results do not show signifcant diference between both groups.
ABSTRACT
The purpose of this study was to observe the effect of canal filling on the bacteria left in the dentinal tubules and to compare the sealing ability between Gutta-percha and Resilon. The bovine dentin block models were prepared. E. faecalis was inoculated to dentin blocks and incubated. The dentin blocks were divided into 5 groups. Group 1 was the negative control. Group 2 was the positive control. Group 3 was filled with ZOE based sealer and Gutta-percha, Group 4 with resin based sealer and Gutta-percha, and Group 5 with resin based sealer and Resilon. After 24 hour, the blocks were incubated at 37degrees C for 1, 2, 3 and 4 weeks on BHI agar plates. The internal dentin portion of the blocks was removed using ISO 027, 029, 031, 035 round burs and the dentin chips were incubated at 37degrees C for 24 hour. Following incubation, the optical density of the medium was measured. The data were statistically analysed using repeated measures ANOVA and one-way ANOVA. The results were as follows, 1. There was statistically significant reduction in the number of E. faecalis of the group where dentinal tubules were completely sealed with nail varnish in comparison with the groups obturated with gutta-percha or resilon (p 0.05). 3. Under the conditions of this experiment, E. faecalis survived up to 4 weeks after obturation with gutta-percha or resilon (p > 0.05).