Goiato Marcelo Coelho, de Medeiros Rodrigo Antonio, Sônego Mariana Vilela, de Lima Taynara Maria Toito, Pesqueira Aldiéris Alves, Dos Santos Daniela Micheline
a Department of Dental Materials and Prosthodontics , Aracatuba Dental School, São Paulo State University (UNESP) , Aracatuba , Brazil.
J Med Eng Technol. 2017 Feb;41(2):115-121. doi: 10.1080/03091902.2016.1239276. Epub 2016 Oct 4.
Short dental implants have been used as an attempt to avoid bone grafts surgery, however there are few literature reports that evaluate changes to their design. Therefore, the aim of this study was to assess the effect of different short implant design on stress distribution through photoelastic analysis. Six external hexagon (5 × 5 mm) short dental implants with different design were used. Each group was treated with a single crown and a three element fixed partial dental prosthesis, resulting in a total of 12 photoelastic models. The assembling photoelastic model-implant-prosthesis was set in a circular polariscope where loads of 100N were applied on the occlusal surface with a Universal Test Machine (UTM). The tension fringes were photographed and later assessed qualitatively by a graphic software (Adobe Photoshop). Less high-intensity fringes were observed on the short implants with triangular threads, short external hexagon and flat apical profile. In conclusion, the macrodesign influenced the amount of stress distributed to the bone when short dental implants are placed.
短种植体已被用于尝试避免骨移植手术，然而，很少有文献报道评估其设计的变化。因此，本研究的目的是通过光弹性分析评估不同短种植体设计对应力分布的影响。使用了六个具有不同设计的外六角形（5×5毫米）短种植体。每组均采用单冠和三单位固定局部义齿进行治疗，共制作了12个光弹性模型。将组装好的光弹性模型-种植体-义齿放置在圆偏振光镜中，用万能试验机（UTM）在咬合面上施加100N的载荷。拍摄张力条纹，随后用图形软件（Adobe Photoshop）进行定性评估。在具有三角形螺纹、短外六角形和扁平根尖轮廓的短种植体上观察到的高强度条纹较少。总之，当植入短种植体时，宏观设计会影响分布到骨上的应力大小。
