Subjects
-Abstract
Objective: to evaluate maxillary skeletal changes concomitant with different three levels of force application for maxillary protraction in growing orthodontiv patients with skeletal class 3 malocclusion. subjets and Methods: The current study was conducted on 30 class 3 patients (19 boys and 11 girls) with maxillary difficieny. The age of the recrutted sample ranged from 7-10 years. The patients were randomely allocated into three equal groups. The point of protraction force application varied among the three groups; groupA at the occlusal plane, group B 20 mm above the occlusal plane and group C at the infraorbital foramen. The duration of the treatment laste for 8 months, the patients were instructed to werethe appliance 16 hour/day with the applied 550gs protraction force. The analysis of the outcomes of this study was doneusing CBCT images were taken before and after maxillary protraction. Results: The average amount of maxillary advancement in the three groups 2.5mm with non-significant difference. The pattern of rotation accompanied with maxillary advancement as demonstrated by PP-TVP; in group A it was counterclockwise rotation (2.8 ̊ )in group B it was minimum (0.35 ̊) and in group C it was clockwise rotation (-1.8 ̊). Conclusions: Varying the point of force application was an efficient tool in order to control the rotation of the maxilla during protraction facemask therapy without affecting the amount of maxillary advancement.
DOI
10.21608/ajdsm.2020.42263.1113
Keywords
Protraction facemask, Multilevels protraction system, Class 3 malocclusion
Authors
MiddleName
-Affiliation
Al-Azhar University
Email
kh.taha@azhar.edu.eg
Orcid
-Link
https://ajdsm.journals.ekb.eg/article_182352.html
Detail API
https://ajdsm.journals.ekb.eg/service?article_code=182352
Publication Title
Al-Azhar Journal of Dental Science
Publication Link
https://ajdsm.journals.ekb.eg/
MainTitle
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