Objective: The purpose of this study was to investigate the changes in upper arch width expansion, the amount of the maxillary posterior teeth tipping and alveolar bone thickness at the buccal and lingual aspects of the posterior teeth by means of cone beam computed tomography in two patients treated with the Damon System.
Materials and Method: Cone beam computed tomography scans of two patients with bilateral posterior crossbite (mean age: 14 years) treated with the Damon System were examined. Scans were taken immediately before and at the end of the upper arch treatment. Measurements included second and first maxillary intermolar, interpremolars and intercanine widths as well as maxillary canine, premolars and molars angulation. Measurement of the amount of alveolar bone thickness of the maxillary posterior teeth at the buccal and lingual aspects was made by an axial section parallel to the palatal plane at the level of right first maxillary root apex.
Results: Significant changes in arch width dimensions were observed in the molar, premolar and canine areas after expansion was achieved. No significant changes were observed in the alveolar bone thickness of the maxillary posterior teeth at the buccal and lingual aspects. Significant increase in the amount of canine, premolar and molar tipping was found at the end of treatment.
Conclusion: Damon System provides comparable arch width expansion by tipping the teeth buccally with no significant difference in the amount of alveolar bone thickness.