A comparison of premolar extraction rates in single-phase versus two-phase treatment of Class II malocclusions

Introduction. The pros and cons of two-phase treatment of Class II malocclusions have been examined in general. This study specifically evaluates both the ability of growth modification to prevent the need for premolar extractions and the resulting cephalometric outcomes.;Methods. The treatment of 98 patients in a Southern California private practice was evaluated. Records were examined to compare premolar extraction rates and final cephalometric numbers in single- and two-phase cases.;Results. In the single-phase group, 49.2% were treated with premolar extractions and only 22.9% of the two-phase group required premolar extractions -- a significant difference (p = 0.01). Final cephalometric measurements showed no significant difference between the two treatment modalities.;Conclusion. Early orthodontic intervention of Class II malocclusions allowed for reduced rates of premolar extraction without compromising the cephalometric outcomes.