screw root

METHODS: Screw thread root canal spiles and resin tooth products were used to rehabilitate tooth root all in once to cases of residual crown, residual root, or traumatic odontoclasis based on complete root treatment.

方法：残冠、残根、外伤牙折在完善的根管治疗的基础上，采用螺纹根管钉与成品树脂牙一次性桩冠修复。

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Therefore, uses the ANSYS re-development functions to achieve the parametric modeling of the taper screw rod with variable root and pitch, for carried on the analysis and the optimized design using ANSYS to each king of structure screw rod has laid the foundation.

为此，利用ANSYS二次开发功能，实现秸秆粗纤维饲料挤压膨化机变根径、变螺距锥形螺杆的参数化建模，为利用ANSYS对各种结构的螺杆进行分析和优化设计奠定了基础。

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Spectacle screw, T filling piece, wristwatch screw, handset screw, miniature nut, dentistry root canal pile.

眼镜螺丝, T型垫片, 手表螺丝, 手机螺丝, 微型螺母, 牙科根管桩.

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Clinical Analysis on Root Canal Screw and Self-shearing Pin to Repair Premolar's Residual Crown and Its Residual Root

根管螺纹钉附加自攻自断钉修复前磨牙残冠残根临床分析

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By optimizing the radius of rounded corner at the root of thread and the structure of screw nut, and by changing the diameter of the root of thread, the concentrated stress was reduced, and stress distribution was improved for higher fatigue strength of the screw bolt.

通过优化螺栓螺纹根部圆角半径和螺母结构、改变螺纹根部直径的方法，缓解螺纹根部的应力集中，改善应力分布，实现提高螺栓疲劳强度的目的。

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