Barat Ali Ramazanzadeh; Mostafa Shahabi; Mohsen Merati
Abstract
Aim: Determination of overall and anterior Bolton ratios in people having normal occlusion in Iran and checking the effect of sexuality upon Bolton ratios in the aforementioned population and pinpointing the ability to apply normal quantities offered by Bolton in the Iranian population.Materials and ...
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Aim: Determination of overall and anterior Bolton ratios in people having normal occlusion in Iran and checking the effect of sexuality upon Bolton ratios in the aforementioned population and pinpointing the ability to apply normal quantities offered by Bolton in the Iranian population.Materials and methods: The study is a cross-sectional descriptive one by surveying study casts provided from 56 high school students (28 boys and 28 girls) having normal occlusions. Bolton ratios were considered in boys and girls separately. Statistical computations were conducted according to student t-test.Results: The total mesiodistal width of 12 permanent teeth and 6 anterior teeth in boys exceeded that of girls however this discrepancy has not statistically significant difference. The quantity of the overall and anterior Bolton ratios did not have statistically significant differences in boys and girls. The mean and standard deviation of the overall and anterior ratios in Iranian population were 91.58±2.03% and 77.73±3.17% which did not have statistically significant differences from the normal quantities offered by Bolton (P<0.05).Conclusion: The normal ratios offered by Bolton can be used in the Iranian boys and girls needing orthodontic treatments.
Mostafa Shahabi; Farzin Heravi; Naser Firoozi
Abstract
Aim: Some cphalometric angles change during growth and in accordance with facial height and other 'facial landmarks which make it less reliable for orthodontic diagnosis. The purpose of this study was to find out relationship between Beta Angle and the anterior-posterior position of jaws.
Materials ...
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Aim: Some cphalometric angles change during growth and in accordance with facial height and other 'facial landmarks which make it less reliable for orthodontic diagnosis. The purpose of this study was to find out relationship between Beta Angle and the anterior-posterior position of jaws.
Materials and Method: Sixty lateral cephalograms of 16 boys and 44 girls with class I, H or HI malocclusions were evaluated in our study. we traced all of the cephalograms to measure Beta angle and compare these values between different types of malocclusions. Data were annalized by means of T-student statistical test.
Results: Beta angle was 28.5° - 37.5° for class 1, less than 28.5° for class II and more than 37.5° for class III. There was no correlation between t3 angle and facial height.
Conclusion: Beta angle is independent from facial height. Beta Angle has an acceptable specificity and sensitivity for determining the anterior posterior position of Jaws (IJO 2006; 1: 184-7).
