ABSTRACT
Objective To compare the stability and clinical efficacy of the distal molar displacement with titanium miniscrews.Methods A total of 82 Class Ⅱ patients with non-extraction (excluding orthognathic surgery) were selected.31 males and 50 females were treated with titanium miniscrews.15 males and 25 females were implanted with a miniscrews between the second premolar and the first molar on both sides of the maxillary palate.16 males and 25 females were bucally implanted between first and second molars.The failure rates and effect of molar displacement of miniscrews between two different implanted sites were compared.Results Group of implants palatally had a 17.6％ failure rate.And group of implants buccally had a 23.0％ failure rate.The failure rate of the former was lower than that of the latter.The difference was statistically significant (P＜0.05),and the former had more molar than the latter (P＜0.05)；the lateral profile was significantly improved and the clinical curative effect was better.Conclusions The stability and clinical efficacy of the distal molar displacement with titanium miniscrews in the palatal side are better.