Pellizzer Eduardo Piza, Carli Rafael Imai, Falcón-Antenucci Rosse Mary, Verri Fellippo Ramos, Goiato Marcelo Coelho, Villa Luiz Marcelo Ribeiro
Department of Dental Materials and Prosthodontics, Araçatuba Dental School, São Paulo State University, Brazil.
J Oral Implantol. 2014 Apr;40(2):117-22. doi: 10.1563/AAID-JOI-D-11-00138. Epub 2011 Dec 30.
The aim of this study was to evaluate stress distribution with different implant systems through photoelasticity. Five models were fabricated with photoelastic resin PL-2. Each model was composed of a block of photoelastic resin (10 × 40 × 45 mm) with an implant and a healing abutment: model 1, internal hexagon implant (4.0 × 10 mm; Conect AR, Conexão, São Paulo, Brazil); model 2, Morse taper/internal octagon implant (4.1 × 10 mm; Standard, Straumann ITI, Andover, Mass); model 3, Morse taper implant (4.0 × 10 mm; AR Morse, Conexão); model 4, locking taper implant (4.0 × 11 mm; Bicon, Boston, Mass); model 5, external hexagon implant (4.0 × 10 mm; Master Screw, Conexão). Axial and oblique load (45°) of 150 N were applied by a universal testing machine (EMIC-DL 3000), and a circular polariscope was used to visualize the stress. The results were photographed and analyzed qualitatively using Adobe Photoshop software. For the axial load, the greatest stress concentration was exhibited in the cervical and apical thirds. However, the highest number of isochromatic fringes was observed in the implant apex and in the cervical adjacent to the load direction in all models for the oblique load. Model 2 (Morse taper, internal octagon, Straumann ITI) presented the lowest stress concentration, while model 5 (external hexagon, Master Screw, Conexão) exhibited the greatest stress. It was concluded that Morse taper implants presented a more favorable stress distribution among the test groups. The external hexagon implant showed the highest stress concentration. Oblique load generated the highest stress in all models analyzed.
本研究的目的是通过光弹性评估不同种植系统的应力分布。用光弹性树脂PL - 2制作了五个模型。每个模型由一块带有种植体和愈合基台的光弹性树脂（10×40×45毫米）组成：模型1，内六角种植体（4.0×10毫米；Conect AR，Conexão，圣保罗，巴西）；模型2，莫氏锥度/内八角种植体（4.1×10毫米；Standard，Straumann ITI，安多弗，马萨诸塞州）；模型3，莫氏锥度种植体（4.0×10毫米；AR Morse，Conexão）；模型4，锁定锥度种植体（4.0×11毫米；Bicon，波士顿，马萨诸塞州）；模型5，外六角种植体（4.0×10毫米；Master Screw，Conexão）。通过万能试验机（EMIC - DL 3000）施加150 N的轴向和斜向载荷（45°），并使用圆偏振光镜观察应力。使用Adobe Photoshop软件对结果进行拍照和定性分析。对于轴向载荷，最大应力集中出现在颈部和根尖三分之一处。然而，对于斜向载荷，在所有模型的种植体根尖以及与载荷方向相邻的颈部观察到最多的等色条纹。模型2（莫氏锥度，内八角，Straumann ITI）的应力集中最低，而模型5（外六角，Master Screw，Conexão）的应力最大。得出的结论是，在测试组中，莫氏锥度种植体呈现出更有利的应力分布。外六角种植体显示出最高的应力集中。在所有分析的模型中，斜向载荷产生的应力最高。
