Neves Ricardo Guimarães, Lazari-Carvalho Priscilla Cardoso, Carvalho Marco Aurélio, Carvalho Alexandre Leite, de Souza João Batista, Torres Érica Miranda
Private Practice, Goiânia, GO, Brazil.
Department of Oral Rehabilitation, School of Dentistry, Evangelical University of Goias, Anápolis, GO, Brazil.
J Indian Soc Periodontol. 2023 Jul-Aug;27(4):392-398. doi: 10.4103/jisp.jisp_356_22. Epub 2023 Jul 1.
To analyze through finite element analysis the stress distribution in peri-implant bone tissues, implants, and prosthetic components induced by the socket shield (SS) technique in comparison to other techniques used to treat tooth loss.
A three-dimensional model of a superior central incisor crown supported by implant was modeled and three different placement conditions were simulated: SS - 2.0-mm-thick root dentin fragment positioned between the alveolar buccal wall and implant; heterologous bone graft (HBG) - bovine bone graft positioned the alveolar buccal wall and implant; and control (C) - implant fully placed in bone tissue of a healed alveolus. The model was restricted at the lateral surfaces of the bone tissue and the following loads were simulated: Both oblique (45°) loads of 100 N on the lingual surface of the crown (maximal habitual intercuspation) and 25.5 N on the incisal edge of the crown (tooth contact during mandibular protrusion) were simultaneously applied. Tensile stress, shear stress, compression, and displacement were analyzed in the cortical bone, trabecular bone, dentin root fragment, and bone graft; while equivalent von Mises stresses were quantified in the implant and prosthetic components.
Stress values of SS and HBG in the bone tissues were higher than C, while slight differences within models were observed for dentin root fragment, bone graft, implant, and prosthetic components.
The SS technique presented the highest stress concentration in the peri-implant tissues.
通过有限元分析，比较用于治疗牙齿缺失的牙槽窝屏障（SS）技术与其他技术，分析种植体周围骨组织、种植体和修复部件中的应力分布。
建立一个由种植体支持的上颌中切牙冠的三维模型，并模拟三种不同的植入条件：SS——在牙槽颊壁和种植体之间放置2.0毫米厚的牙根牙本质碎片；异体骨移植（HBG）——在牙槽颊壁和种植体之间放置牛骨移植材料；以及对照（C）——种植体完全植入愈合牙槽的骨组织中。该模型在骨组织的侧面进行约束，并模拟以下载荷：同时在牙冠舌面施加100 N的斜向（45°）载荷（最大习惯性牙尖交错位）和在牙冠切缘施加25.5 N的载荷（下颌前伸时牙齿接触）。分析皮质骨、松质骨、牙本质根碎片和骨移植材料中的拉应力、剪应力、压应力和位移；同时对种植体和修复部件中的等效应力进行量化。
骨组织中SS和HBG的应力值高于C组，而在牙本质根碎片、骨移植材料、种植体和修复部件的模型中观察到细微差异。
SS技术在种植体周围组织中表现出最高的应力集中。
