Madhan Mohan, A (2011) Bolton’s Anterior and Overall Tooth Size Discrepancy among different malocclusion groups in Chennai Population: An Epidemiological study. Masters thesis, Tamilnadu Government Dental College and Hospital, Chennai.
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Abstract
An observational and cross sectional study was done to determine whether there is a difference in intermaxillary tooth size discrepancies among the malocclusion groups and to determine the percentage of tooth size discrepancies outside 1 or 2 standard deviations from Bolton’s inter arch tooth size ratio. The study two hundred and thirty eight study models randomly selected from archives of the department of orthodontics, Tamil Nadu Government Dental College and Hospital, Chennai, Tamil Nadu. The samples were divided into three groups based on Angle’s classification of malocclusion – class I, class II Div I, and class III, coinciding with skeletal relationship, which was based on the steiner’s ANB angle: class I 0<ANB <5; class II ANB >5 and class III ANB <o. Each of these groups was again divided into two groups- males and females. The Bolton’s anterior and overall ratio was calculated for each group. The values were then compared for any possible gender difference and also among each group and with that of Bolton’s normal value. The study concludes that 1. There were no significant differences in the tooth size discrepancy between male and female. 2. The percentage of subjects with a deviation of more than 1 standard deviation for anterior and overall ratio was 68 and 57.1 respectively. 3. The percentage of subjects with a deviation of more than 2 standard deviation for anterior and overall ratio was 42.4 and 27.7 respectively. 4. Class III malocclusion group showed greater prevalence of tooth size discrepancies greater than 2 standard deviation compared to class II and class I. 5. There were no statistically significant differences in the Bolton anterior and overall ratios between the different malocclusion groups - class I, class II and class III. 6. The anterior ratio of class I and class III in the present study was significantly larger than the Bolton’s normal value for anterior ratio. Recent technological advances have allowed the introduction of digital callipers, which can be linked to computers for rapid calculation of the Bolton’s anterior and overall ratio and this computer program can virtually eliminate measurement transfer and calculation errors, compared with analysis that requires dividers, rulers and calculators. Few computerised methods like Quick Ceph, HATS, and OrthoCad needs special mention here.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Bolton’s Anterior ; Overall Tooth Size Discrepancy ; different malocclusion groups ; Chennai Population ; Epidemiological study. |
| Subjects: | DENTAL > Orthodontics and Dentofacial Orthopedics |
| Depositing User: | Kambaraman B |
| Date Deposited: | 12 May 2018 07:27 |
| Last Modified: | 12 May 2018 07:27 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/7712 |
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