Qu Zhen-Zhen, Li Xiao-Guang, Wang Qing
School of Stomatology Shandong University, Shandong Provincial Key Laboratory of Oral Tissue Regeneration. Jinan 250012, Shandong Province,China. E-mail:
Shanghai Kou Qiang Yi Xue. 2016 Oct;25(5):560-565.
To evaluate the sealing ability of three different lengths of root canal fillings after post space and two different obturation techniques by using a glucose leakage test, and provide theoretical basis for clinical selection of best collocation of root canal filling methods and residual root canal filling materials.
One hundred and thirty-two extracted single-root teeth were randomly divided into 6 experimental groups(n=20 each), positive(n=6)and negative controls(n=6). After root canal preparation, different treatments were performed in different groups. Group A: lateral compaction and 4 mm length of root canal fillings after post space. Group B: lateral compaction and 6 mm length of root canal fillings after post space. Group C: lateral compaction and 8 mm length of root canal fillings after post space. Group D: warm gutta vertical compaction and 4 mm length of root canal fillings after post space. Group E: warm gutta vertical compaction and 6 mm length of root canal fillings after post space. Group F: warm gutta vertical compaction and 8 mm length of root canal fillings after post space. Group G: random root canal filling. Group H: no root canal filling. A glucose leakage model was used for quantitative evaluation of the coronal to apical microleakage. SPSS 19.0 software package was used for statistical analysis.
Lateral compaction showed significantly more leakage than warm gutta vertical compaction at all observation times, regardless of the length of the root canal fillings. The shorter the length of root canal fillings after post space, the worse the effect of the apical sealing for the same filling method. There was significant difference between 4 mm and 6 mm (P<0.05), but no significant difference between 8 mm and 6 mm (P>0.05).
Warm vertical compaction shows a better sealing result than cold lateral compaction of gutta-percha. The shorter the length of root canal fillings after post space, the worse the effect of the apical sealing. 6 mm may be the proper residual root filling material length after post space preparation.
通过葡萄糖渗漏试验评估三种不同长度的桩道预备后根管充填以及两种不同充填技术的封闭能力，为临床选择最佳根管充填方法与剩余根管充填材料的搭配提供理论依据。
132颗拔除的单根牙随机分为6个试验组（每组n = 20）、阳性对照组（n = 6）和阴性对照组（n = 6）。根管预备后，不同组进行不同处理。A组：侧方加压充填且桩道预备后根管充填长度为4 mm。B组：侧方加压充填且桩道预备后根管充填长度为6 mm。C组：侧方加压充填且桩道预备后根管充填长度为8 mm。D组：热牙胶垂直加压充填且桩道预备后根管充填长度为4 mm。E组：热牙胶垂直加压充填且桩道预备后根管充填长度为6 mm。F组：热牙胶垂直加压充填且桩道预备后根管充填长度为8 mm。G组：随机根管充填。H组：未进行根管充填。采用葡萄糖渗漏模型对冠方至根尖的微渗漏进行定量评估。使用SPSS 19.0软件包进行统计分析。
无论根管充填长度如何，在所有观察时间点，侧方加压充填的渗漏均显著多于热牙胶垂直加压充填。桩道预备后根管充填长度越短，相同充填方法的根尖封闭效果越差。4 mm与6 mm之间存在显著差异（P < 0.05），但8 mm与6 mm之间无显著差异（P > 0.05）。
热牙胶垂直加压充填的封闭效果优于冷牙胶侧方加压充填。桩道预备后根管充填长度越短，根尖封闭效果越差。6 mm可能是桩道预备后合适的剩余根管充填材料长度。
