Skeletal and functional effects of treatment for unilateral posterior crossbite

被引:66
|
作者
Brin, I
BenBassat, Y
Blustein, Y
Ehrlich, J
Hochman, N
Marmary, Y
Yaffe, A
机构
[1] HEBREW UNIV JERUSALEM,HADASSAH SCH DENT MED,FAC MED DENT,DEPT PROSTHODONT,JERUSALEM,ISRAEL
[2] HEBREW UNIV JERUSALEM,HADASSAH SCH DENT MED,FAC MED DENT,DEPT ORAL RADIOL,JERUSALEM,ISRAEL
关键词
D O I
10.1016/S0889-5406(96)70178-6
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Unilateral posterior crossbite (UPXB) is a common malocclusion, frequently presenting a lower midline deviation, accompanied by Class II subdivision relationships in final closure and a very high prevalence of the reverse sequencing (RS) pattern of jaw movement. These features often persist even after the elimination of the crossbite. The purpose of the present study was to examine in detail the morphologic, skeletal, and functional effects of the treatment for this malocclusion category. The experimental group consisted of 24 children in the mixed dentition stage with UPXB who were treated with removable expansion plates and a control group of 10 age-matched children with normal occlusion. Longitudinal follow-up revealed a stable dental maxillary arch expansion of at least 1.5 mm but a complete elimination of crossbite in only 50% of the cases. The frequent persistence of Class II subdivision relations and lower midline deviation that were not due to functional mandibular shift was striking. The pretreatment posteroanterior (P-A) cephalograms indicated reduced facial and maxillary widths. After treatment, the achieved maxillary width increase was greater than expected with normal growth. Longitudinal assessment of the mandibular movement response revealed by the electrognathograph showed a high prevalence of RS, which was reduced after treatment. In conclusion, (1) a higher than expected prevalence of skeletal transverse aberrations at the maxillary and zygomatic levels were found in the UPXB group; (2) the removable expansion appliance induces transverse growth of the maxilla; and (3) an inherent pattern of jaw movement is characteristic to the UPXB and does not change significantly with orthodontic treatment.
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收藏
页码:173 / 179
页数:7
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