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《West China Journal of Stomatology》 2014-01
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Effect of taper and inserting angle on stability of micro-implants in type Ⅱ bone with three-dimensional finite element

Dong Jing;Zhang Zhechen;Zhou Guoliang;Dept. of Stomatology, Lianyungang Chinese Medicine Hospital;Dept. of Orthodontics, Shanghai Ninth People's Hospital Affiliated Shanghai Jiao Tong University School of Medicine;Jiangsu Automation Research Institute of China Shipbuilding Industry Corporation;  
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.
【CateGory Index】: R783.5
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