3Fritz U, Ehmer A , Diedrich P. Clinical suitability of titanic microscrews for orthodontic anchorage - preliminary experiences [ J ]. Orofac Orthop , 2004 , 65 : 410-418.
4Ducheyne P , Beight J , Cuckler J. Effect of calcium phosphate coating characteristics on early postoperative bone tissue in growth[J]. Biomaterials ,1990 , 11:531-540.
5Schnelle MA , Beck FM, Jaynes RM, et al. A radiographic evaluation of the availability of bone for placement of miniscrews [J]. Angle Orthod , 2004 , 74 : 832-837.
6Maino BG, Bednar J, Pagin P et al. The spider screw for skeletal anchorage [J]. Clin Orthod, 2003,37(2) :90 -97.
