Effect of taper and inserting angle on stability of micro-implants in typeⅡbone with three-dimensional finite element
10.7518/hxkq.2014.01.004
- VernacularTitle:Ⅱ类骨质中正畸微种植体锥度及植入角度对支抗稳定性影响的三维有限元分析
- Author:
Jing DONG
1
;
Zhechen ZHANG
;
Guoliang ZHOU
Author Information
1. 连云港市中医院口腔科
- Keywords:
micro-implant;
inserting angle;
taper;
stability
- From:
West China Journal of Stomatology
2014;(1):13-17
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effect of taper and inserting angle on stability of micro-implants in type Ⅱ bone and to provide theoretical evidence for clinical selection of taper and inserting angle. Methods Three-dimensional finite element models of type Ⅱ bone sections and micro-implants were fabricated. They were designed using different tapers (diameter between 1.1 to 1.6 mm, taper between 0 to 0.062 5) and different inserting angles ranging from 30° to 90° (30°, 45°, 60°, 75°, 90°). Effects on the maximum von Mises stresses in mandible and micro-implants, as well as on the maximum displacements in micro-implants, were analyzed under an applied 2 N horizontal force. Results The inserting angle had a significant effect on stresses and displacements, with lower distribution of stresses and displacements occurring at 60°. The effect of the taper was also related to the inserting angle. The minimum stresses were 5.013 4 MPa (cortical bone) and 25.131 0 MPa (micro-implant) in model D at 60°. The displacements of micro-implants were proportional to the taper. Conclusion The inserting angle has a significant effect on stability of micro-implants, and the recommended inserting angle is 60°. The influence of taper on the stability of micro-implants is related to the inserting angle. The micro-implant with 0.037 5 taper (maximum diameter is 1.6 mm, minimum diameter is 1.3 mm) is more suitable for type Ⅱ bones.
