平台转换对种植体应力分布影响的光弹性分析

Photoelastic analysis of the influence of platform switching on stress distribution in implants.

作者信息

Pellizzer Eduardo Piza, Falcón-Antenucci Rosse Mary, de Carvalho Paulo Sérgio Perri, Santiago Joel Ferreira, de Moraes Sandra Lúcia Dantas, de Carvalho Bruno Machado

机构信息

Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University, Brazil.

出版信息

J Oral Implantol. 2010;36(6):419-24. doi: 10.1563/AAID-JOI-D-09-00077. Epub 2010 Jun 14.

DOI:10.1563/AAID-JOI-D-09-00077

PMID:20545530

Abstract

The aim of this study was to evaluate the stress distribution of platform switching implants using a photoelastic method. Three models were constructed of the photoelastic resin PL-2, with a single implant and a screw-retained implant-supported prosthesis. These models were Model A, platform 5.0 mm/abutment 4.1 mm; Model B, platform 4.1 mm/abutment 4.1 mm; and Model C, platform 5.00 mm/abutment 5.00 mm. Axial and oblique (45°) loads of 100 N were applied using a Universal Testing Machine (EMIC DL 3000). Images were photographed with a digital camera and visualized with software (AdobePhotoshop) to facilitate the qualitative analysis. The highest stress concentrations were observed at the apical third of the 3 models. With the oblique load, the highest stress concentrations were located at the implant apex, opposite the load application. Stress concentrations decreased in the cervical region of Model A (platform switching), and Models A (platform switching) and C (conventional/wide-diameter) displayed similar stress magnitudes. Finally, Model B (conventional/regular diameter) displayed the highest stress concentrations of the models tested.

摘要

本研究的目的是使用光弹性方法评估平台转换种植体的应力分布。采用光弹性树脂PL-2构建了三个模型，包括单个种植体和一个螺丝固位的种植体支持式修复体。这些模型分别为：模型A，平台5.0 mm/基台4.1 mm；模型B，平台4.1 mm/基台4.1 mm；模型C，平台5.00 mm/基台5.00 mm。使用万能试验机（EMIC DL 3000）施加100 N的轴向和斜向（45°）载荷。用数码相机拍摄图像，并使用软件（Adobe Photoshop）进行可视化处理，以利于定性分析。在三个模型的根尖三分之一处观察到最高应力集中。在斜向载荷作用下，最高应力集中位于种植体根尖，与载荷施加方向相对。模型A（平台转换）颈部区域的应力集中降低，并且模型A（平台转换）和C（传统/大直径）显示出相似的应力大小。最后，模型B（传统/常规直径）在所测试的模型中显示出最高的应力集中。