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KMID : 0352219890110000689
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Kyung Hee Dental Journal
1989 Volume.11 No. 0 p.689 ~ p.701
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A statistical study of the correlation between tooth width and crowding overjet and overbite and the evaluation of Bolton ratio in degree of the crowding
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Abstract
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There are many etiologic factors and types in malocclusion. Crowding is perhaps the most frequently occurring characteristic of malocclusion, especially in Angle´s class I molar relationship.
The purpose of this study is to evaluate the dental crowding, overjet and overbite and its correlation to tooth width and to evaluate Bolton ratio in degree of the dental crowding. 113 students (55 male, 58 female) with Angle´s class I molar relationship were selected for this study. Impression and wax bite were taken, and plaster models were made. The data were measured from the models and analysed statistically.
The results were as follows:
1. There was a correlation between the sum of maxillary 12 tooth and the irregularity index (p < 0.05), and the irregularity index was greatest (6.32mm) when the sum of maxillary 12 tooth was in 90-102mm.
2. There was a correlation between the sum of maxillary and mandibular 6 anterior tooth,
and mandibular 12 tooth and the irregularity index in the 90 pct. confidence interval.
3. There was a correlation between the sum of maxillary 12 tooth and the overjet (p < 0.05),
4. There was a positive correlation between the sum of maxillary 12 tooth and the overjet and a negative correlation between the sum of mandibular 12 tooth and the overjet in the 90 pct.
confidence interval.
5. There was no correlation between the sum of tooth and the overbite.
6. Anterior ratio was 78.7 and overall ratio was 91.03.
7. Anterior ratio and overall ratio were greatest when the maxillary and mandibular irregularity index was in 3-6mm.
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KEYWORD
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