Goiato Marcelo Coelho, Arsufi Guilherme Sarauza, de Medeiros Rodrigo Antonio, Pesqueira Aldiéris Alves, Guiotti Aimée Maria, dos Santos Daniela Micheline
Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP - Sao Paulo State University , Aracatuba, Sao Paulo , Brazil.
J Med Eng Technol. 2015;39(6):322-7. doi: 10.3109/03091902.2015.1054525. Epub 2015 Jun 23.
The aim of this study was evaluate the biomechanical behaviour of prostheses screwed into conventional (0° angulation) and pre-angled experimental (8, 12 and 20°) external hexagon implants (13 × 4 mm) by photoelastic analysis. Eight casts were made in photoelastic resin. Casts were divided into groups of single crowns or three combined elements. Each unit was positioned in a circular polariscope. By using a universal testing machine, 100 N loads were applied in the axial and oblique (45°) directions to fixed points on the occlusal surfaces of the crowns. Generated stresses were recorded photographically and analysed qualitatively in a graphics program. In single-element prostheses, the number of high-stress fringes increased with increasing implant angle. However, in three-element prostheses, there was no difference in the stress distribution with implant angle, except for the 12° implant that had a higher degree of stress. For the other groups pre-angulation of the implant increases the concentration and intensity of stresses for single prosthesis and has similar stress distribution in three-element fixed prostheses.
本研究的目的是通过光弹性分析评估拧入传统（0° 角度）和预成角度实验性（8°、12° 和 20°）外六角种植体（13×4 mm）的假体的生物力学行为。用光弹性树脂制作了八个模型。模型分为单冠组或三个联合部件组。每个单元放置在圆偏振光镜中。通过使用万能试验机，在轴向和倾斜（45°）方向上对冠的咬合面上的固定点施加 100 N 的载荷。以摄影方式记录产生的应力，并在图形程序中进行定性分析。在单部件假体中，高应力条纹的数量随着种植体角度的增加而增加。然而，在三部件假体中，除了 12° 种植体的应力程度较高外，应力分布随种植体角度没有差异。对于其他组，种植体的预成角度增加了单假体的应力集中和强度，并且在三部件固定假体中具有相似的应力分布。
