Abstract: PURPOSE: To investigate the treatment of impacted mandibular first molars by straight wire appliance technique, and evaluate the effectiveness of treatment. METHODS: Eight patients with first mandibular impacted molars were treated with MBT straight wire appliance. Surgical fenestration was done after sufficient space created. Statistical comparisons were carried out using t test by SPSS 12.0 software package. RESULTS: Eight mandibular impacted molars were brought into occlusal plane (3.94±0.49 mm), and the overbite and overjet were normal. Good occlusion was achieved. X-ray film showed that alveolar bone growth around the molars was good. CONCLUSIONS: Orthodontic treatment combined with surgical fenestration can effectively correct the impacted mandibular first molars.

Key words: First molar, Impacted teeth, Surgical fenestration, Orthodontic treatment