The effects of a corticotomy on space closure by molar protraction using TSADs in patients with missing mandibular first molars

Introduction The purpose of this study was to evaluate the effects of a triangular‐shaped corticotomy on the protraction of second and third molars in patients with missing mandibular first molars. Subjects and Methods The corticotomy and non‐corticotomy groups consisted of sixteen first molars in fifteen patients (28.6 ± 9.4 years) and nineteen first molars in fifteen patients (26.6 ± 8.4 years), respectively. A triangular‐shaped corticotomy was performed between the second premolar and molar. Temporary skeletal anchorage devices (TSADs) were placed between the first and second premolars in both groups. Mandibular dentition variables were measured on the pre and post‐treatment panoramic radiographs and lateral cephalograms. Analysis of covariance was performed. Results The corticotomy group exhibited 2.8 mm more inter‐radicular correction between the second molar to second premolar roots (P