Evaluation of hard and soft tissue changes following orthodontic treatment of bimaxillary protrusion in adults

抄録

Bimaxillary protrusion, which causes facial disharmony due to protrusion and incomplete closure of the lips, has many psychological effects on the patient. We investigated whether changes in soft tissue morphology could be predicted by using the revised analysis method proposed by Arnett to determine the relationship between changes in hard tissue morphology and changes in the soft tissue profile before and after orthodontic treatment of adult patients with bimaxillary protrusion. The subjects were 17 patients who were diagnosed as having bimaxillary protrusion. We measured each item of the TVL Projections with Arnett analysis to determine the amount of change in soft tissue using cephalograms before and after treatment, and examined the correlation between changes in the hard and soft tissues. We found correlations between the Nasal Tip and U1 to SN; A' and SNA; the Upper Lip Anterior and OJ, U1 to SN; Maxillary 1 and OJ, U1 to SN; and Mandibular 1 and L1 to MP. These results suggest that it is necessary to understand the relationship between changes in the hard and soft tissues before and after orthodontic treatment. (J Osaka Dent Univ 2020; 54: 193-198)