【摘要】：目的采用三維有限元方法,研究髓腔固位冠修復(fù)下頜第一前磨牙牙體缺損時(shí),不同邊緣設(shè)計(jì)對牙體組織和修復(fù)體所受應(yīng)力的影響。方法建立4種邊緣設(shè)計(jì)形式(平面對接式邊緣、直角肩臺、135°肩臺、凹面形邊緣)的下頜第一前磨牙髓腔固位冠修復(fù)模型。加載點(diǎn)為牙齒長軸與牙合面交點(diǎn),方向?yàn)榕c牙齒長軸平行、與牙齒長軸成45°,力量大小為100N。計(jì)算分析4種邊緣設(shè)計(jì)形式的髓腔固位冠修復(fù)后牙體組織和修復(fù)體頸部的應(yīng)力分布情況及最大Von Mises應(yīng)力值。結(jié)果(1)沿牙齒長軸方向加載,應(yīng)力集中出現(xiàn)在修復(fù)體和牙齒頸部的舌側(cè)邊緣,平面對接式邊緣和直角肩臺的頸部應(yīng)力分布要比135°肩臺和凹面形邊緣的應(yīng)力分布均勻;(2)施加與牙齒長軸成45°的載荷,應(yīng)力主要集中在頰側(cè)邊緣,平面對接式邊緣較其他3種邊緣形式的應(yīng)力分布要更為均勻,牙齒和修復(fù)體的最大應(yīng)力值均明顯高于與牙齒長軸平行加載情況下的應(yīng)力值;(3)無論施加與牙齒長軸平行還是與牙齒長軸成45°的載荷,平面對接式邊緣的牙齒和修復(fù)體頸部的應(yīng)力值均最小,修復(fù)體頸部的應(yīng)力值要大于牙齒頸部的應(yīng)力值;(4)平面對接式邊緣牙釉質(zhì)的應(yīng)力水平高于牙本質(zhì)。結(jié)論從基牙和修復(fù)體受力情況來講,髓腔固位冠修復(fù)采用平面對接式邊緣和直角肩臺優(yōu)于其他邊緣設(shè)計(jì)。
[Abstract]:Objective to study the effect of different edge designs on the stress of mandibular first premolars by using three dimensional finite element method (FEM). Methods four kinds of edge design models were established for the restoration of mandibular first premolar pulp cavity retention crown with four types of edge design (plane docking edge, right angle shoulder abutment 135 擄shoulder abutment, concave edge). The loading point is the point at which the tooth axis intersects with the occlusal surface, the direction is parallel to the tooth axis, 45 擄with the tooth axis, and the force is 100 N. The stress distribution and maximum Von Mises stress of the dental tissue and the neck of the restoration were calculated and analyzed after the restoration of four kinds of marginal design forms of the pulp cavity retainer crown. Results (1) when loaded along the long axis of the tooth, the stress concentrated on the lingual edge of the prosthesis and the neck of the tooth. The stress distribution in the neck of the plane-butt edge and the right-angle shoulder abutment is more uniform than that of the 135 擄shoulder plate and concave edge. (2) the stress is mainly concentrated on the buccal edge under a load of 45 擄on the long axis of the tooth. The stress distribution of the plane docking edge is more uniform than that of the other three edge forms. The maximum stress values of teeth and prostheses are significantly higher than those of teeth under loading parallel to the long axis of the tooth; (3) whether the load is applied at 45 擄parallel to the long axis of the tooth or to the long axis of the tooth, The stress value of the tooth and the neck of the prosthesis is the smallest, and the stress of the restoration neck is larger than that of the tooth neck. (4) the stress level of the enamel of the plane-butt edge is higher than that of the dentin. Conclusion in terms of the stress of abutment teeth and prostheses, the prosthesis of pulp cavity retainer crown is superior to other edge designs by plane docking edge and right shoulder abutment.
【作者單位】： 解放軍總醫(yī)院口腔修復(fù)科;太原理工大學(xué);
【基金】：國家自然科學(xué)基金(3081307) 北京市科技計(jì)劃項(xiàng)目(2010B078,Z141100002114031)~~
【分類號】：R783

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