不同根管充填方法对牙根抗折性的影响

发布时间：2018-04-19 22:16

本文选题：单尖法 + 冷侧压充填法　；参考：《上海交通大学》2014年硕士论文

【摘要】：目的：评价不同根管充填方法(单尖法、热牙胶充填法和冷侧压充填法)对牙根抗折性的影响。方法：60颗新鲜拔除的单根管下颌前磨牙截冠使其全长为12mm。测量每个牙根的颊舌径和近远中径，将其随机分为5组（每组12个样本）。组间的颊舌径和近远中径无统计学差异。第组不预备和充填，设为对照组。其余牙根使用化学与机械预备结合，应用ProTaper旋转镍钛系统预备到F3至工作长度。第二组不充填。第三、四、五组分别用冷侧压、单尖法、热垂直加压结合AH-plus糊剂进行充填。所有牙根都垂直包埋于自凝塑料块中，并暴露出冠部7mm。接着在万能试验机下加载垂直向力（1mm/min）。记录根折时的压力（N），，应用SAS9.0对数据进行Kruskal Wallis检验和Nemenyi检验。结果：根管预备不充填组与对照组之间有统计学差异（p0.05)；根管预备充填的各组与对照组之间没有统计学差异（p0.05）。不同根管充填各组之间没有统计学差异(p0.05)。结论:根管预备明显削弱牙根的抗折性，但可以为根管充填所补偿；而不同根管充填方法对牙根抗折性的影响没有显著区别。
[Abstract]:Objective: to evaluate the effect of different root canal filling methods (single tip method, hot gum filling method and cold side filling method) on root fracture resistance. Methods the crown of mandibular premolars with one root canal was cut to 12 mm in length of 60 freshly extracted mandibular premolars. The buccal and lingual diameters and proximal distal diameters of each root were measured and randomly divided into 5 groups (12 samples per group). There was no significant difference in buccal and lingual diameters between the two groups. The first group was not prepared and filled, and was set up as the control group. The rest of the teeth were prepared to F 3 to working length using the ProTaper rotary nickel-titanium system using chemical and mechanical preparation. The second group was not filled. The third, fourth and fifth groups were filled with cold side pressure, single tip method, hot vertical pressure and AH-plus paste respectively. All the roots were perpendicularly embedded in the self-coagulating plastic block and the crown was exposed to 7 mm. Then a vertical force of 1 mm / min is loaded under a universal testing machine. The pressure of root fracture was recorded and the data were tested by Kruskal Wallis and Nemenyi with SAS9.0. Results: there was significant difference between the root canal preparation group and the control group (P 0.05), but there was no significant difference between the root canal preparation group and the control group (P 0.05). There was no significant difference between different root canal filling groups (P 0.05). Conclusion: root canal preparation can significantly weaken root fracture resistance, but it can be compensated by root canal filling, but different root canal filling methods have no significant difference on root fracture resistance.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R781.05

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