CBCT Evaluation of Skeletal, Dental, and Volumetric Maxillary Sinus Changes Associatied with Two Types of Palatial Expanders

Résumé du livre

The purpose of this study was to use cone beam computed tomography (CBCT) to assess the skeletal and dental effects of banded versus bonded expanders. The experimental sample consisted of 23 patients, 13 (7M, 6F; mean age = 12.6 +/- 1.8 years) treated with banded hyrax expanders and 10 (5M, 5F; mean age 13.5 +/- 2.1) treated with bonded hyrax expanders. CBCT images were taken at T1 pre-treatment and T2 immediately after expansion appliance removal. Linear, angular, and volumetric measurements were taken of the maxilla, dentition, and nasomaxillary complex. A mixed design analysis of variance (ANOVA) was used to assess relationships between and within groups. If ANOVA results were significant, post hoc t tests were used to determine where the significant differences occurred. Regardless of appliance, the maxilla was expanded equally at the level of the canine, first, and second premolars. However, at the level of the first molar, more dental tipping and alveolar bending was evident in the banded expander group. Both appliance equally increased dimension of the nasal cavity and maxillary sinus. The two appliances successfully expanded the maxillary arch and supporting skeletal structures. Little difference was seen between the two expanders except that more dental tipping was evident in the banded than the bonded expander group. Furthermore, maxillary expansion increases maxillary sinus volume.