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Evaluation of the Upper Airway Changes in Class II Patients Resulting From Functional Treatment Using Cone Beam Computed Tomography - An In Vivo Study

تقييم تغيرات الطرق الهوائية العلوية عند مرضى الصنف الثاني الناتجة عن المعالجة الوظيفية باستخدام التصوير المقطعي المحوسب ذي الحزمة المخروطية - دراسة سريرية

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 Publication date 2018
  fields Dentistry
and research's language is العربية
 Created by Shamra Editor




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Objective: This research aimed to evaluate the three-dimensional effects of a Twin Block (TB) appliance on the pharyngeal airway passage (PAP) in a sample of Class II patients with mandibular retrusion using cone-beam computed tomography (CBCT).

References used
ABDELKARIM A, 2012- A cone beam CT evaluation of oropharyngeal airway space and its relationship to mandibular position and dentocraniofacial morphology, J World Fed Orthod, 1(2): p. e55-e59
BIBY R and PRESTON C, 1981- The hyoid triangle, Am J Orthod, 80(1): p. 92-97
COHEN J, 1992- A power primer, Psychol Bull, 112(1): p. 155- 159
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The RME force is not only concentrated on widening the maxilla, it is concomitant changes occur in craniofacial sutures, from here the need for this study was originated. Aim of the study: To investigate the immediate effect of rapid maxillary expansion on the spheno-occipital Synchondrosis in children using cone beam computed tomography.
Class II malocclusion is a common clinical problem among white Caucasian population and its transverse component is a critical aspect of a functional and stable occlusion. The size and shape of the arches have considerable implications in orthodontic diagnosis and treatment planning, affecting the space available, dental esthetics, and stability of the dentition. Hence , it is important to study the alveolar arch width in this group of patients using the wide possibilities of cone beam computed tomography of evaluating real anatomy , true-to-scale images without distortions or superimpositions, and the selection of the desired sections.Objective:To evaluate the width of maxillary and mandibular alveolar arches in skelatal Class II adults compared to skeletal class I using cone beam computed tomography. Materials and methods: thirty-two subjects with skeletal Class II relationship and 10 subjects with skeletal Class I who were ordinary undergoing CBCT scan for non-orthodontics nor for otorihnolaryngology purpose were selected to measure the maxillary and mandibular alveolar width of first premolar and first molars.Independent samples’ t-test was calculated. Results:No statistically significant differences were found of alveolar widths between skeletal Class II and Class I subjects in both maxillary and mandibular widths of molar and premolar regions. Gender had no statistically significant effect in the results of the study. Conclusion :There is no differences in alveolar width between adults with skeletal Class II and Class I relationships, so the transverse discrepancy in skeletal Class II when exsists , it is more probably not originated from the alveolar base.
It is difficult to choose between the rapid maxillary expansion (RME) and surgically assisted RME (SARME), we aimed to study the relationship between the obliteration index in midpalatal suture and cervical vertebral maturation staging (CVMs).
In this study, 24 patients with posterior skeletal cross-bite were treated at Orthodontics Department-Faculty of Dentistry in Hama University. Hyrax expansion device was applied in all patients and the results were assessed after active expansion period. Cone beam computed tomography radiograph were taken at the assessment times. Results showed that the midpalatal suture width has increased significantly at all measured areas. The results revealed that significant tipping in the canines , premolars and molars was recorded in this study.

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