| 韩琳1 孙德刚2 金增平3 王万春2△ 纪栓3.后磨牙模拟根管模型制备与研究[J].,2011,11(7):1270-1272 |
| 后磨牙模拟根管模型制备与研究 |
| Preparation of model of simulated retromolar root canal |
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| DOI： |
| 中文关键词: 镍钛根管锉 模拟根管 根管预备 模型 |
| 英文关键词: Root canal instruments Nickel-Titanium files Simulation root canal Root canal preparation Model |
| 基金项目: |
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| 中文摘要: |
| 目的：制备后磨牙模拟根管模型。方法：依照预实验中测试的牙本质和树脂根管模型材料的布氏硬度值（牙本质HB72，树脂
块HB54）选取纯铜质铜管为材料（纯铜HB58）同时利用预实验中确认的后磨牙模拟根管模型弯曲角度的范围（70°-60°）并参
照树脂根管模型相关数据，设计不同弯曲角度(70°,64°,60°)的纯铜质根管模型，将20 套镍钛根管锉随机分为4 组，其中3 组
根管锉分别预备相应角度的10 个纯铜质后磨牙根管模型，另一组在临床预备10 个后磨牙根管作为对照组。所有镍钛根管锉均
在疲劳寿命测试装置中测试疲劳寿命。结果：选用根管长度为16mm±1mm,弯曲半径为5mm,内径为0.70mm 的纯铜质铜管制作
后磨牙根管模型。其中在弯曲角度为70°的后磨牙根管模型中有33%(2/6)近似临床；在弯曲角度为64°的后磨牙根管模型中有
67%(4/6)近似临床；在弯曲角度为60°的后磨牙根管模型中有33%(2/6)近似临床。结论：弯曲角度为64°的纯铜制后磨牙模拟
根管模型更接近于临床实际，可为体外研究镍钛根管锉各项指标提供一个较为理想的模型。 |
| 英文摘要: |
| Objcetive: To set up a model of simulated retromolar root canal. Methods: According to the Brinell hardness values of
dentin and resin obtained from the preliminary experiments, (HB72, HB54), the pure copper with a Brinell hardness value HB58 was
chosen as the material of the model. Three different angles of artificial root canals were designed, with the parameters of those of resin
canal models: the length was 16 mm and the radius of curvature was 5 mm, and the inner diameter was 0.7 mm. Twenty sets of ProTaper
Nickel-Titanium rotary-instruments were randomly divided into four groups with 5 sets each. Group A prepared 50 pure copper artificial
root canals with an angle of curvature of 70 degrees, Group B 64 degrees and Group C 60 degrees. Group D prepared 50 retromolars. After
preparation, Fatigue tests of all files were carried out in a bench device. Results: The similarity rate of Group A, B, C and Group D were
33%, 67%, 33% respectively. Conclusion: The pure copper artificial root canal with an angle of curvature of 64 degrees was an ideal
model for the research of Nickel-Titanium rotary-instruments in vitro. |
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