Repository of Research and Investigative Information

Repository of Research and Investigative Information

Shahid Sadoughi University of Medical Sciences

Comparing the range of mu and beta angles in 6-17-year-old children of Isfahan with normal occlusion

(2014) Comparing the range of mu and beta angles in 6-17-year-old children of Isfahan with normal occlusion. Dental Research Journal. pp. 39-44. ISSN 1735-3327 (Print) 2008-0255 (Electronic) 1735-3327 (Linking)

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Official URL: https://www.ncbi.nlm.nih.gov/pubmed/24688558

Abstract

BACKGROUND: Linear and angular measurements such as A point, nasion, B point (ANB) angle and Wits appraisal index are not accurate enough to evaluate sagittal relationship of the jaws. The aim of this study was to evaluate and compare the range of mu and beta angles in 6-17-year-old children of Isfahan, having normal occlusion. MATERIALS AND METHODS: This was an analytical descriptive study. For this study, 235 cephalometric radiographs of patients who didn't receive orthodontics treatments and based on 13 indexes had normal occlusion, were selected. After tracing of cephalograms, ANB angle, Wits appraisal index, mu angle (resulted from the intersection of AB line and perpendicular line from point A to mandibular plane) and beta angle (resulted from the intersection of AB line and perpendicular line from point A on CB line) were measured. Data was analyzed by t-test, ANOVA and Pierson-Spearman correlation coefficient (P < 0.05). RESULTS: Mean value of mu and beta angles were 17.34 +/- 3.47 and 31.7 +/- 3.31 and ranged from 8-27 to 21.5-39 respectively. According to t-test, there was a significant difference between two sex groups for mu angle (P = 0.02); however, it was not significant for beta angle. According to Spearman correlation coefficient, there was no significant difference between age and mu angle; however, beta angle was directly and significantly related to age (r = 0.435). There was significant and reverse relationship between mu and beta angles with ANB angle and Wits appraisal index. CONCLUSION: mu and beta angles are reliable and can be used to evaluate the anterior-posterior relationship of the jaws.

Item Type: Article
Keywords: A point B point angle nasion normal occlusion wits appraisal index beta angle mu angle
Page Range: pp. 39-44
Journal or Publication Title: Dental Research Journal
Volume: 11
Number: 1
ISSN: 1735-3327 (Print) 2008-0255 (Electronic) 1735-3327 (Linking)
Depositing User: Mr mahdi sharifi
URI: http://eprints.ssu.ac.ir/id/eprint/31342

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