Clinical effect observation of unhealthy first molar extraction in orthodontic treatment

Objective To discuss the effectiveness of orthodontic treatment with first molar extraction.Methods Extract 1～3 first molar for malocclusion sixteen patients with unhealthy or missing first molar,treated with straight wire and traditional anchorage technique as clinical analysis of treatment effectiveness.Results The treatment duration of the sixteen patients was 16～31 months and the average duration was 22.6 months.After treatment,anterior crossbite was corrected,normal overjet and overbite achieved,the teeth roots were paralled well,side facial appearance was good,extraction spaces were closed.Conclusion Carefully design,proper strength and methods can obtain satisfactory clinical effect in the first molar extraction case.