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目的:比较不同根管充填方法及桩道预备后不同长度的充填材料对根尖的封闭作用,寻找根管充填方法和剩余充填材料的最佳搭配选择,为临床应用提供理论依据。方法:132颗单根管牙随机分为6个实验组(每组各20颗)和2个对照组(每组各6颗)。根管预备后A、B、C 3组行冷牙胶侧方加压充填,桩道预备后分别剩余4、6、8 mm根管充填物;D、E、F 3组行连续波热牙胶充填,桩道预备后分别剩余4、6、8 mm根管充填物;G组(阴性对照组)随机选择不同充填方法及不同长度剩余根管充填物;H组不进行根管充填。利用葡萄糖定量检测微渗漏模型,检测各组从冠方向根方渗漏的葡萄糖浓度(体积)。采用SPSS 19.0软件包对数据进行统计学分析。结果:A和D、B和E、C和F比较,冷牙胶侧方加压充填组微渗漏显著大于热牙胶充填组。A和B、A和C、D和E、D和F相比,差异均具有显著性;B和C、E和F相比,无显著差异,说明根尖剩余4 mm和6 mm组间具有显著差异,而剩余6 mm和8 mm组间无显著差异。结论:连续波热牙胶充填技术的根尖封闭性能显著优于冷牙胶侧方加压法。桩道预备后剩余6 mm微渗漏较少,是较合适的剩余充填材料长度。
OBJECTIVE: To compare the sealing effect of root canal filling with different lengths of filling materials after different root canal filling methods and post-preparation, and to find out the optimal combination of root canal filling method and residual filling material, so as to provide a theoretical basis for clinical application. Methods: 132 single root canal teeth were randomly divided into 6 experimental groups (20 in each group) and 2 control groups (6 in each group). After root canal preparation, the group A, B and C were treated with cold dentin side pressure filling, and the remaining 4,6,8 mm root canal filling materials were left after the preparation of the stump. In group D, E and F, The remaining 4, 6 and 8 mm root canal filling materials were left after plastic filling and stump preparation. Group G (negative control group) were randomly selected with different filling methods and residual root canal filling with different lengths. The microleakage model was quantitatively detected by glucose, and the glucose concentration (volume) in each group root leakage from the coronal direction was measured. Data were statistically analyzed using SPSS 19.0 software package. Results: The microleakage of the side of the collateral-filled cold dentin was significantly greater than that of the dentin-filled group compared with that of the D, B, E, C and F groups. A and B, A and C, D and E, D and F, the differences were significant; B and C, E and F, no significant difference between the root tips of the remaining 4 mm and 6 mm group has Significant differences, while the remaining 6 mm and 8 mm group no significant difference. CONCLUSION: The apical sealability of continuous-wave heat-gutta-percha technique is significantly better than that of cold gutta-percha lateral compression. The remaining 6 mm microleakage after the preparation of the stope is less, which is a suitable length of the remaining filling material.