3种根充糊剂微渗漏的实验研究

目的评价3种根充糊剂的根管封闭性能。方法收集新鲜拔除的人前牙100颗，随机分为A、B、C 3个实验组（每组30颗牙齿）和D、E 2个对照组（每组5颗牙齿），A、B、C组分别采用Vitapex糊剂、AH- plus糊剂、氧化锌丁香油（ZOE）糊剂加牙胶尖侧压充填根管，D组为阳性对照组，E组为阴性对照组。牙齿用2%甲基兰溶液浸泡，脱矿使牙齿透明，在根管显微镜下测量染料渗入根管的长度。结果A、B、C组染料渗入长度分别为（0.57±0.56）mm、（0.79±0.96）mm、（1.07±1.12）mm，阳性对照组染料渗入根管全长，阴性对照组无染料渗入。A组与B、C组间染料渗入长度有显著性差异（P<0.01），B组与C组间染料渗入长度无显著性差异（P>0.05）。结论Vitapex糊剂根尖封闭性优于AH- plus糊剂与ZOE糊剂。

Evaluation of Sealing Ability of Three Kinds Endodontic Materials as Root Canal Sealers

OBJECTIVE: To compare the apical microleakage of Vitapex (calcium hydroxide based paste) with that of AH-plus and zinc oxide eugenol sealer when used with laterally condensed gutta percha obturation technique. METHODS: One hundred single rooted human anterior teeth were instrumented and randomly divided into three experimental groups (A, B, C) of 30 teeth each and two control groups (D, E) of 5 teeth each. Group A was filled with laterally condensed gutta-percha using Vitapex as sealer. Group B was filled with laterally condensed gutta-percha using AH-plus as sealer. Group C was filled with laterally condensed gutta-percha using zinc oxide eugenol as sealer. Group D was the positive control. Group E was the negative control, which were coated with nail polish to entire root surface. Teeth were then suspended in 2% methylene blue. After this, teeth were demineralized dehydrated and cleared. Linear dye penetration was determined under stereomicroscope with calibrated eye piece. RESULTS: The mean dye penetration for group A, B, C were respectively (0.57 +/- 0.56) mm, (0.79 +/- 0.96) mm and (1.07 +/- 1.12) mm. Group D demonstrated maximum dye penetration. Group E showed no dye penetration. There was no statistically significant difference between group B and group C (P > 0.05). However, there was statistically significant difference between group A and group B, C (P < 0.01). CONCLUSION: This study showed that Vitapex used as endodontic sealer material are better than AH-plus sealer and zinc oxide eugenol sealer.