Department of Dental Materials and Prosthodontics, School of Dentistry of São José dos Campos, São Paulo State University (UNESP), São José dos Campos, 12245-000, SP, Brazil.
Implant Dent. 2009 Dec;18(6):512-20. doi: 10.1097/ID.0b013e3181bcc621.
: The objective of this in vitro study was to quantify the strain development of external hexagon and internal hexagon implant-supported partial prostheses in straight and offset implant placement configurations.
: Three external hexagon and 3 internal hexagon implants were embedded in the center of each polyurethane block. Four strain gauges were bonded on the surface of polyurethane. The 20 superstructure occlusal screws were tightened onto the Microunit abutments with a torque of 10 Ncm using the manufacturer's manual of torque-controlling device.
: There were statistic significant differences in hexagonal type (P = 0.0210 < 0.05). There were nostatistic significant differences in placement configuration (P = 0.7483 > 0.05). The results showed fundamental differences between both conditions.
: Under the limited conditions of this study, the hexagon internal connection displayed higher values of microstrain than the hexagon external type implant placement. There was no evidence that there was an advantage of offset placement in reducing the strain around implant. There was no proof from this investigation that the straight placement generated higher microstrain than offset placement.
本体外研究的目的是量化直型和偏心种植体放置配置中外六角和内六角种植体支持局部义齿的应变发展。
将三个外六角和三个内六角种植体嵌入每个聚氨酯块的中心。在聚氨酯表面粘贴四个应变片。使用扭矩控制装置的制造商手册，将 20 个上部结构的咬合螺丝用 10 Ncm 的扭矩拧紧到 Microunit 基台上。
在六角形类型方面存在统计学显著差异（P = 0.0210 < 0.05）。在放置配置方面没有统计学显著差异（P = 0.7483 > 0.05）。结果表明两种情况下存在根本差异。
在本研究的有限条件下，内六角连接显示出比外六角类型种植体放置更高的微应变值。没有证据表明偏心放置有利于减少种植体周围的应变。本研究没有证明直型放置比偏心放置产生更高的微应变。
