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Watanabe H., Deguchi T., Hasegawa M., Ito M., Kim S., Takano‐Yamamoto T. 
Orthodontic miniscrew failure rate and root proximity, insertion angle, bone contact length, and bone density 
Orthod Craniofac Res 2013; 16:44–55. © 2012 John Wiley & Sons A/S

Objectives –  To test the hypothesis that there is no significant correlation between miniscrew failure rate and root proximity, insertion angle, bone contact length, and bone density.

Setting and Sample Population –  This study included 107 patients in whom 190 miniscrews had been placed from April 2008 to October 2009 in Tohoku University Hospital (Sendai, Japan).

Materials and Methods –  Cone beam computed tomography scans (CBCT) and periapical radiographs were taken before and after miniscrew placement. Differences in root proximity, screw insertion angle, bone contact length, and bone density were statistically …