Evaluation of clinical efficacy of mini-screw implant as anchorage for extruded molar intrusion

ObjectiveTo evaluate the efficiency of mini-screw implants as anchorage for extruded molar intrusion.MethodsThirteen patients with over-erupted maxillary molars were selected,including 9 patients with extruded maxil lary first molars because mandibular first molars missed,and 4 patients with extruded maxillary second molars because of molars scissors bite on one-side posterior teeth. All the extruded first maxillary molars were intruded in gingival direc tion with mini-screw implants anchorage. Lateral cephalograms and orthopantomograph were taken at the beginning and the end of the treatment. The movement of molars in vertical dimension was analyzed.ResultsThe extruded first maxil lary molars were intruded(3.00±0.65)mm averagedly in 6.5 months.ConclusionMini-srcew implant as anchorage is an effective method to intrude the extruded maxillary molars.