A biomechanical effect of wide implant placement and offset placement of three implants in the posterior partially edentulous region
A biomechanical effect of wide implant placement and offset placement of three implants in the posterior partially edentulous region
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DOI：
10.1046/j.1365-2842.2000.00475.x
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发表时间：
2000-01-01
影响因子：
2.9
通讯作者：
Akagawa, Y
中科院分区：
文献类型：
--
作者：
Sato, Y;Shindoi, N;Akagawa, Y
为防止固定假体与种植体的螺钉松动或断裂，建议采用颊舌交错偏置或宽种植体。然而，目前尚不清楚这种用法如何补偿侧向咬合力产生的扭矩。本研究评估了三个种植体的偏移放置和在最后侧位置的宽种植体放置的有效性。采用三维几何分析方法计算颊部或舌部载荷垂直于牙尖倾斜度（10度或20度）的临床情况下金螺钉的拉力。三种种植体（空组3.75 mm）的放置方式有四种：(1)直种植；(2)第二种植体的颊偏置；(3)第二种植体舌侧偏移；(4)在大多数后侧位置放置宽种植体（空套5毫米）。偏置并不一定会降低金螺钉的张力，而宽置和牙尖倾角的降低则会降低金螺钉的张力。
To prevent loosening or fracture of screws retaining the prosthesis to the implants in the posterior partially edentulous region, the use of staggered buccal and lingual offset placement or wide implants is suggested. However, it is not known how this usage compensates for the torque produced by lateral occlusal forces. This study evaluated the effectiveness of offset placement of three implants and a wide implant placement at the most posterior site. Three-dimensional geometric analysis was used to calculate the tensile force applied to gold screws in clinical situations with buccal or lingual loading perpendicular to cuspal inclination (10 or 20 degrees). Four variations of the placement of three implants (empty set 3.75 mm) are: (1) straight; (2) buccal offset of the second implant; (3) lingual offset of the second implant; (4) a wide implant (empty set 5 mm) placement at most posterior site. The offset placement did not always decrease tensile force at the gold screw, but wide implant placement and decrease in cuspal inclination did.