Piattelli A, Scarano A, Piattelli M, Vaia E, Matarasso S
Dental School, University of Chieti, Italy.
J Periodontol. 1998 Feb;69(2):185-9. doi: 10.1902/jop.1998.69.2.185.
One of the possible complications of implant treatment is the occurrence of an implant fracture. Metal fatigue and biomechanical overload seem to be the most common causes of fractured implants. This study evaluated 4 implants (3 hollow cylinders and 1 hollow screw) which fractured after a mean loading period of 2.8 years. All implants had a 4 mm diameter and had been inserted in a posterior location. In 3 cases parafunctional habits were present. In all cases a vertical resorption of the peri-implant bone was present. The endosseous portion of the implant presented always a very high bone-implant contact percentage. Scanning electron microscopic examination showed that at least one of the implant holes was involved in the fracture line; no porosities or material defects were observed on the fractured surface of the implant. In hollow implants the holes could represent a site of less resistance.
种植治疗的可能并发症之一是种植体骨折的发生。金属疲劳和生物力学过载似乎是种植体骨折最常见的原因。本研究评估了4颗种植体（3颗空心圆柱状和1颗空心螺丝状），这些种植体在平均加载2.8年后发生骨折。所有种植体直径均为4毫米，且植入于后部位置。3例存在副功能习惯。所有病例均存在种植体周围骨的垂直吸收。种植体的骨内部分始终呈现出非常高的骨-种植体接触百分比。扫描电子显微镜检查显示，至少有一个种植体孔位于骨折线上；在种植体的骨折表面未观察到孔隙或材料缺陷。在空心种植体中，这些孔可能代表阻力较小的部位。
