Dentofacial changes of combined double-hinged rapid maxillary expansion and protraction facemask therapy
| Autor: | Tsai Wen-Ching, 蔡文卿 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 Objective: This study was designed to measure the dentofacial changes after using double-hinged rapid maxillary expander, which was designed to force the forward movement of teeth and maxilla, and protraction face mask. In order to move maxilla forward and enhance the results of the protraction facemask, alternate rapid maxillary expansions and constructions was used. Methods: Twenty consecutive subjects with unilateral cleft lip and palate (male: 14, female: 6) were included in this prospective study. Their average age was 12 year-old. All of the subjects were under gone rapid maxillary expansion and maxillary protraction treatment using double-hinged rapid maxillary expander and protraction facemask devices in a six months treatment duration. Pre-treatment (T1), post maxilla expansion (T2), and post maxilla protraction (T3) dental casts and lateral cephalograms were taken in order to measure the dentofacial changes of all the subjects. Results: In terms of dental changes, the results indicated that, during the expansion phase (T1-T2), the dental arch revealed V-shape expansion because the increasing degree of intercanine width was larger than intermolar width. Base on the reference line, the entire teeth were pushed forward. In terms of skeletal changes, a 1.70 mm forward movement of A point was observed at T1-T2 phase. During the protraction phase (T2-T3), A point moved forward 3.31 mm. During the total six months treatment (T1-T3), a total 5.01 mm of A point forward movement, and the mandible clockwise rotated was observed in this study. Conclusion: The application of double-hinged rapid maxillary expander and protraction facemask was an effective treatment course for the patients with unilateral cleft lip and palate. This course not only effectively created an anterior movement of maxilla but also pushed the entire teeth forward. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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