Pellizzer Eduardo Piza, Falcón-Antenucci Rosse Mary, de Carvalho Paulo Sérgio Perri, Sánchez Daniela Mayumi Inatomi Kavano, Rinaldi Gabriel Augusto Tozo, de Aguirre Carolina Calles, Goiato Marcelo Coelho
Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University-UNESP, São Paulo, Brazil.
J Craniofac Surg. 2011 Mar;22(2):434-7. doi: 10.1097/SCS.0b013e318207477c.
The aim of this study was to perform a photoelastic analysis of stress distribution on straight and angulated implants with different crowns (screwed and cemented). Three models were made of photoelastic resin PL-2: model 1: external hexagon implant 3.75×10.00 mm at 0 degrees; model 2: external hexagon implant 3.75×10.00 mm at 17 degrees; model 3: external hexagon implant 3.75×10.00 mm at 30 degrees. Axial and oblique (45 degrees) load (100 N) was applied with a universal testing machine. The photoelastic fringes on the models were recorded with a digital camera and visualized in a graphic software for qualitative analysis. The axial loading generated the same pattern of stress distribution. The highest stresses were concentrated between medium and apical thirds. The oblique loading generated a similar pattern of stress distribution in the models with similar implant angulation; the highest stress was located on the cervical region opposite to implant angulation and on the apical third. It was concluded that the higher the implant angulation, the higher the stress value, independent of crown type. The screwed prostheses exhibited the highest stress concentration. The oblique load generated higher stress value and concentration than the axial load.
本研究的目的是对不同牙冠（螺丝固位和粘结固位）的直形和角度种植体上的应力分布进行光弹性分析。用光弹性树脂PL - 2制作了三个模型：模型1：3.75×10.00 mm的外六角形种植体，角度为0度；模型2：3.75×10.00 mm的外六角形种植体，角度为17度；模型3：3.75×10.00 mm的外六角形种植体，角度为30度。用万能试验机施加轴向和斜向（45度）载荷（100 N）。用数码相机记录模型上的光弹性条纹，并在图形软件中进行可视化以进行定性分析。轴向加载产生了相同的应力分布模式。最高应力集中在中部和根尖三分之一之间。斜向加载在种植体角度相似的模型中产生了相似的应力分布模式；最高应力位于与种植体角度相对的颈部区域和根尖三分之一处。得出的结论是，种植体角度越高，应力值越高，与牙冠类型无关。螺丝固位修复体表现出最高的应力集中。斜向载荷比轴向载荷产生更高的应力值和应力集中。
