【摘要】：目的基于三維有限元法研究根管預(yù)備過程中硬組織喪失和牙根微裂紋對(duì)上頜第二前磨牙的應(yīng)力影響,為分析臨床上根管治療后患牙根折率增大的成因提供一定的參考。方法利用Micro-CT掃描上頜第二前磨牙,結(jié)合逆向工程軟件建立完整牙體、僅有預(yù)備過程中組織喪失的牙體及預(yù)備后有不同牙根裂紋的預(yù)備后牙體3D模型,研究其在靜態(tài)載荷下的應(yīng)力情況。結(jié)果軸向力作用于完整牙體時(shí),牙本質(zhì)Von Mises應(yīng)力集中分布于舌側(cè)頸部;側(cè)向力作用下,Von Mises應(yīng)力集中分布于加力同側(cè)牙根中上2/3處。軸向力和側(cè)向力作用于預(yù)備后無牙根裂紋形成的牙體時(shí),應(yīng)力分布及應(yīng)力值與完整牙體相比無明顯變化。當(dāng)牙根裂紋產(chǎn)生時(shí),軸向力作用下應(yīng)力值相對(duì)于預(yù)備前無明顯變化,應(yīng)力有向裂紋集中的趨勢(shì);側(cè)向力作用下,應(yīng)力峰值多增大明顯,且應(yīng)力多集中于裂紋局部。結(jié)論根管預(yù)備過程中的組織喪失對(duì)牙體應(yīng)力情況無明顯影響;牙根裂紋的產(chǎn)生會(huì)導(dǎo)致側(cè)向力作用下應(yīng)力值明顯增大,且應(yīng)力分布集中區(qū)域也多由牙體舌側(cè)頸部轉(zhuǎn)移至裂紋局部,牙根裂紋可能是導(dǎo)致根管預(yù)備后根折的重要因素。
[Abstract]:Objective to study the effect of hard tissue loss and root microcrack on the stress of maxillary second premolar during root canal preparation based on three-dimensional finite element method (FEM), and to provide a reference for analyzing the causes of the increase of root fracture rate after upper root canal therapy. Methods Micro-CT was used to scan the maxillary second premolars and reverse engineering software was used to establish the complete teeth. There were only 3D models of teeth with different root cracks in the process of preparation. The stress under static load is studied. Results when the axial force was applied to the intact tooth, the Von Mises stress of dentin was concentrated in the lingual neck, and the, Von Mises stress was concentrated in the upper 2 / 3 of the root of the same side of the tooth under the lateral force. When the axial force and lateral force acted on the teeth without root crack after preparation, the stress distribution and stress values had no significant change compared with the intact teeth. When the root crack is produced, the stress value under axial force has no obvious change compared with that before preparation, and the stress tends to be concentrated in the direction of crack, and the stress peak value increases obviously under lateral force, and the stress is mostly concentrated on the local crack. Conclusion the loss of tissue during root canal preparation has no significant effect on the stress of tooth. The root crack will cause the stress value to increase obviously under lateral force, and the stress concentration area will transfer from the lingual neck to the crack area. The root crack may be an important factor leading to the root fracture after root canal preparation.
【作者單位】： 重慶醫(yī)科大學(xué)附屬口腔醫(yī)院口腔疾病與生物醫(yī)學(xué)重慶市重點(diǎn)實(shí)驗(yàn)室重慶市高校市級(jí)口腔生物醫(yī)學(xué)工程重點(diǎn)實(shí)驗(yàn)室;
【基金】：重慶市渝中區(qū)科技計(jì)劃項(xiàng)目(20140129) 2016年重慶高校創(chuàng)新團(tuán)隊(duì)建設(shè)計(jì)劃資助項(xiàng)目 重慶市高校市級(jí)口腔生物醫(yī)學(xué)工程重點(diǎn)實(shí)驗(yàn)室資助項(xiàng)目(渝教科[2014]55號(hào))~~
【分類號(hào)】：R781.05

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