Mandibular Distal Force System Assisted With Miniscrew Anchorage; A Clinical Three Dimensional Evaluation

Abstract

The aim of this study was to evaluate mandibular distal force system assisted with miniscrew anchorage three dimensionally. CBCT images were used to evaluate the effect of miniscrew anchorage in distalization of mandibular molars. A sample of 15 subjects that required mandibular distalization was selected from the outpatient clinic of the Orthodontic Department in the Faculty of Dentistry, Ain Shams University. From those patients; 12 patients completed the study and 3 patients dropped out. Among these 12 patients, 6 patients required unilateral distalization and 6 patients required bilateral distalization in the mandibular arch. After taking the standard orthodontic records, prior to the insertion of the distalizing appliance and the miniscrew, patients were referred for extraction of lower right and left third molars, if present. Molar bands were selected and cemented for both lower first and second molars. Self-drilling titanium miniscrews with collar diameter of 1.4 mm and a length of 6 mm were selected for insertion in the buccal interradicular bone between lower canine and first premolar. DPMD was tailored to the insertion site and was fabricated from .017" × .025" TMA wire. A section of .019" × .025" TMA wire was inserted in the main tube of the first and second molars bands to held them together buccally and a three unit power chain held them together lingually through