School of Dentistry, China Medical University and Hospital, Taichung, Taiwan.
Int J Oral Maxillofac Implants. 2010 Jul-Aug;25(4):706-14.
The aim of this study was to evaluate the effects of cortical bone thickness and implant length on strain in the surrounding bone and micromotion at the bone-implant interface in single immediately loaded implants.
Experiments with rapid prototyping technique and finite element simulations were performed to evaluate bone strain and micromotion at the bone-implant interface. Implants (13-mm long) were embedded into models with three thicknesses of cortical bone (0.5, 1.7, and 3.4 mm), and implants with different lengths (11.5 and 15.0 mm) were inserted into models with 1.7 mm of thickness of cortical bone. Vertical and lateral loads of 130 N were applied to the models.
On lateral loading, the strains were highly concentrated on one side of the mandible in both experimental and finite element models. Sliding and gap distances were reduced when the cortical bone was thicker and when the implant was longer.
Placement of a longer implant into thicker cortical bone will result in reduced sliding and gap distances. However, bone strain is influenced more by the cortical bone thickness than by the implant length for single immediately loaded implants.
本研究旨在评估皮质骨厚度和种植体长度对单即刻负载种植体周围骨应变和骨-种植体界面微动的影响。
采用快速成型技术和有限元模拟实验来评估骨-种植体界面的骨应变和微动。将（长 13mm）种植体嵌入皮质骨厚度分别为 0.5、1.7 和 3.4mm 的模型中，将长度分别为 11.5 和 15.0mm 的种植体插入皮质骨厚度为 1.7mm 的模型中。对模型施加 130N 的垂直和侧向载荷。
在侧向加载时，实验和有限元模型中应变都高度集中在下颌骨的一侧。当皮质骨较厚和种植体较长时，滑动和间隙距离减小。
在较厚的皮质骨中植入较长的种植体会减少滑动和间隙距离。然而，对于单即刻负载种植体，骨应变受皮质骨厚度的影响大于种植体长度。
