上颌双侧中切牙外伤行冠延长术后的修复设计

发布时间：2018-10-30 11:42

【摘要】：目的:比较上颌双侧中切牙外伤行冠延长术后,不同修复设计对牙槽骨应力及牙齿动度的影响。方法:通过逆向工程技术建立齿冠延长术后不同骨下降高度的三维有限元模型,并将其设计为单冠、二联冠、三联冠、四联冠修复;然后用三维有限元法分析降低不同牙槽骨高度对桩核冠修复后牙槽骨应力分布及牙齿动度的影响。结果:随着牙槽骨高度的降低,所有修复形式组的牙槽骨应力及牙齿位移都有所上升,其中单冠修复组的增加幅度最大;当骨高度下降1 mm和2 mm时,单冠和3种联冠修复均能满足牙周潜力的要求;而骨下降高度为3 mm时,单冠修复组的应力值超过了牙周潜力的范围,二联冠修复接近牙周潜力,三联冠及四联冠修复均小于牙周潜力。结论:去骨高度在2 mm以内时,单冠和二联冠修复均可,但二联冠可以降低手术后造成的不利影响;当去骨高度为3 mm时,必须采用联冠修复,最好选用三联冠修复。
[Abstract]:Objective: to compare the effects of different restoration designs on alveolar bone stress and tooth movement after crown lengthening for bilateral maxillary central incisor injury. Methods: three dimensional finite element models of different osteodescending heights after tooth crown lengthening were established by reverse engineering, and were designed as single crown, double crown, triple crown and quadruple crown. Then the effect of reducing the height of alveolar bone on the stress distribution and tooth movement of posterior alveolar bone repaired by post-core crown was analyzed by three-dimensional finite element method. Results: with the reduction of alveolar bone height, the alveolar bone stress and tooth displacement increased in all kinds of restoration groups, especially in the single crown group. When the height of bone decreased by 1 mm and 2 mm, both single crown and three kinds of combined crown could meet the requirement of periodontal potential. The stress value of single crown group exceeded the range of periodontal potential when the height of bone decreased 3 mm. The restoration of double crown was close to periodontal potential, and that of triplex crown and quadruple crown was lower than that of periodontal potential. Conclusion: when the height of bone removal is less than 2 mm, both single and double crowns can be repaired, but the adverse effects after operation can be reduced by double crown, and when the height of bone removal is 3 mm, it is necessary to use combined crown repair, and it is better to use triplex crown to repair.
【作者单位】：安阳市第六人民医院口腔医院;第四军医大学口腔医院修复科军事口腔医学国家重点实验室;
【分类号】：R783.3

【共引文献】