PDF(Pubmed)
Abstract：
UNASSIGNED: Apical root resection pattern affects the stress distribution behavior in the apical region of the resected tooth. The purpose of the study was to compare the biomechanical responses of resected teeth between endodontic microsurgery (horizontal resection) and targeted endodontic microsurgery (round resection).
UNASSIGNED: Five different models were developed. The basic model without resection (NR) was regarded as the control model, and the others involved: horizontal resection without bone grafting (HN), horizontal resection with bone grafting (HG), round resection without bone grafting (RN), and round resection with bone grafting (RG) models. A static load of 100 N was applied to the buccal and palatal cusps of all the teeth in a 30° oblique direction. The maximum von-Mises stress and tooth displacement values were analyzed and compared.
UNASSIGNED: Both the HN and RN models exhibited lower stress distribution values on bone compared with the NR (control) model. Regarding maximum stress distribution at the root apex, the stress value of the RN model was slightly higher compared to the HN model, whereas the RG model displayed a slightly lower stress value in comparison with the HG model. For maximum tooth displacement value, there were no significant differences between the HN and RN models, as well as the HG and RG models.
UNASSIGNED: The round resection pattern had comparable stress distribution behaviors at the root apex and tooth displacement values with the horizontal resection pattern. Targeted endodontic microsurgery might provide better biomechanical response of the resected tooth after root-end resection.
UNASSIGNED: Five different models were developed. The basic model without resection (NR) was regarded as the control model, and the others involved: horizontal resection without bone grafting (HN), horizontal resection with bone grafting (HG), round resection without bone grafting (RN), and round resection with bone grafting (RG) models. A static load of 100 N was applied to the buccal and palatal cusps of all the teeth in a 30° oblique direction. The maximum von-Mises stress and tooth displacement values were analyzed and compared.
UNASSIGNED: Both the HN and RN models exhibited lower stress distribution values on bone compared with the NR (control) model. Regarding maximum stress distribution at the root apex, the stress value of the RN model was slightly higher compared to the HN model, whereas the RG model displayed a slightly lower stress value in comparison with the HG model. For maximum tooth displacement value, there were no significant differences between the HN and RN models, as well as the HG and RG models.
UNASSIGNED: The round resection pattern had comparable stress distribution behaviors at the root apex and tooth displacement values with the horizontal resection pattern. Targeted endodontic microsurgery might provide better biomechanical response of the resected tooth after root-end resection.
摘要：
■根尖根切除模式影响切除牙齿的根尖区域中的应力分布行为。该研究的目的是比较牙髓显微手术（水平切除）和靶向牙髓显微手术（圆形切除）之间切除牙齿的生物力学反应。
■开发了五种不同的模型。不切除的基本模型(NR)被视为控制模型，其他涉及：不植骨的水平切除（HN），水平切除植骨（HG），圆形切除不植骨（RN），和圆形切除植骨（RG）模型。在30°倾斜方向上对所有牙齿的颊尖和腭尖施加100N的静载荷。分析比较了最大von-Mises应力值和牙齿位移值。
■与NR（对照）模型相比，HN和RN模型均表现出较低的骨骼应力分布值。关于根尖处的最大应力分布，与HN模型相比，RN模型的应力值略高，而与HG模型相比，RG模型显示出略低的应力值。对于最大齿位移值，HN和RN模型之间没有显着差异，以及HG和RG模型。
■圆形切除模式在根尖和牙齿位移值处具有与水平切除模式相当的应力分布行为。有针对性的牙髓显微手术可能在根端切除术后为切除的牙齿提供更好的生物力学响应。
■开发了五种不同的模型。不切除的基本模型(NR)被视为控制模型，其他涉及：不植骨的水平切除（HN），水平切除植骨（HG），圆形切除不植骨（RN），和圆形切除植骨（RG）模型。在30°倾斜方向上对所有牙齿的颊尖和腭尖施加100N的静载荷。分析比较了最大von-Mises应力值和牙齿位移值。
■与NR（对照）模型相比，HN和RN模型均表现出较低的骨骼应力分布值。关于根尖处的最大应力分布，与HN模型相比，RN模型的应力值略高，而与HG模型相比，RG模型显示出略低的应力值。对于最大齿位移值，HN和RN模型之间没有显着差异，以及HG和RG模型。
■圆形切除模式在根尖和牙齿位移值处具有与水平切除模式相当的应力分布行为。有针对性的牙髓显微手术可能在根端切除术后为切除的牙齿提供更好的生物力学响应。
