Mattison G D, von Fraunhofer J A
J Prosthet Dent. 1983 May;49(5):636-8. doi: 10.1016/0022-3913(83)90388-8.
Two-dimensional photoelastic stress analysis was used to investigate the effects of post diameter on stress distribution under angulated (26-degree) loads. Ten models were used; five for each diameter were tested. The models were placed in the straining frame of the polaroscope, and compressive forces of 30 and 60 pounds were applied to each of the models. Instantaneous photographs were made immediately after each load was applied. The fringe patterns were quantitated by determining the maximum fringe order in the test model. The results of this investigation suggest that (1) post diameter should be restricted with heavy anterior masticatory forces and (2) restricting post diameter conserves tooth structure and substantially reduces internal stresses within teeth that have cast-gold posts.
采用二维光弹性应力分析来研究桩直径对成角（26度）载荷下应力分布的影响。使用了10个模型；每种直径各5个模型进行测试。将模型放置在偏光镜的应变框架中，对每个模型施加30磅和60磅的压缩力。每次加载后立即拍摄即时照片。通过确定测试模型中的最大条纹级数对条纹图案进行量化。本研究结果表明：（1）在前牙咀嚼力较大时，桩直径应受限；（2）限制桩直径可保留牙体组织，并大幅降低有铸造金桩牙齿内部的应力。
