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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparison of the correlation of photoelasticity and digital imaging to characterize the load transfer of implant-supported restorations
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Comparison of the correlation of photoelasticity and digital imaging to characterize the load transfer of implant-supported restorations

机译：比较光弹性和数字成像的相关性，以表征植入物支持的修复体的负荷转移

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Statement of problem Whether splinting or not splinting adjacent implants together can optimize the stress/strain transfer to the supporting structures remains controversial. Purpose The purpose of this study was to compare the photoelasticity and digital image correlation (DIC) in analyzing the stresses/strains transferred by an implant-supported prosthesis. Material and methods A polymethylmethacrylate model was made with a combination of acrylic resin replicas of a mandibular first premolar and second molar and threaded implants replacing the second premolar and first molar. Splinted (G1/G3) and nonsplinted (G2/G4) metal-ceramic screw-retained crowns were loaded with (G1/G2) and without (G3/G4) the presence of the second molar. Vertical static loads were applied to the first molar implant-supported crown (50 N-photoelasticity; 250 N-DIC). The resulting isochromatic fringes in the photoelastic models were photographed, and a single-camera 2-dimensional DIC system recorded the deformation at the surface of the resin models. Results Residual stresses were present in the photoelastic model after screw fixation of the crowns. The following average photoelastic stress results (MPa) were found around the loaded implant: G1 (20.06), G2 (23.49), G3 (30.86), G4 (37.64). Horizontal strains (εxx, %) between the molars averaged over the length of the loaded implant were found by DIC: G1 (0.08 ±0.09), G2 (0.13 ±0.10), G3 (0.13 ±0.11), G4 (0.16 ±0.11). Splinted crowns transferred lower stresses to the supporting bone when the second molar was absent. The second molar optimized the stress distribution between the supporting structures even for nonsplinted restorations. Conclusions Both methods presented similar results and seemed capable of indicating where issues associated with stress/strain concentrations might arise. However, DIC, while apparently less sensitive than photoelasticity, is not restricted to the use of light-polarizing materials.
机译：问题陈述将相邻的植入物夹在一起或不夹在一起可以优化应力/应变向支撑结构的转移仍存在争议。目的本研究的目的是比较光弹性和数字图像相关性（DIC），以分析由植入物支撑的假体传递的应力/应变。材料和方法用下颌第一前磨牙和第二磨牙的丙烯酸树脂复制品和替代第二前磨牙和第一磨牙的螺纹植入物组合制作聚甲基丙烯酸甲酯模型。夹板（G1 / G3）和不夹板（G2 / G4）的金属陶瓷螺钉固定牙冠分别装有（G1 / G2）和不含（G3 / G4）的第二磨牙。将垂直静态载荷施加到第一磨牙植入物支撑的牙冠（50 N-光弹性; 250 N-DIC）。拍摄光弹性模型中所得的等色条纹，并用单相机二维DIC系统记录树脂模型表面的变形。结果冠的螺钉固定后，光弹性模型中存在残余应力。在负载的植入物周围发现以下平均光弹性应力结果（MPa）：G1（20.06），G2（23.49），G3（30.86），G4（37.64）。通过DIC发现在加载的植入物长度上平均的磨牙之间的水平应变（εxx，％）：G1（0.08±0.09），G2（0.13±0.10），G3（0.13±0.11），G4（0.16±0.11） 。当第二磨牙缺失时，夹板冠将较低的应力传递至支撑骨。第二磨牙即使对于非夹层修复物也可以优化支撑结构之间的应力分布。结论两种方法均显示出相似的结果，并且似乎能够指出与应力/应变浓度相关的问题。然而，尽管DIC显然不如光弹性敏感，但它并不限于使用偏振材料。

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