Syed Shazil Hussain, Babur Ashraf, Shakeel Qutub Khan.
Relationship of dental crowding to tooth size and arch dimensions in class I normal & class I malocclusion sample.
Pak Oral Dental J Jan ;34(4):660-4.

Various studies have been conducted to find the cause of crowding in Class I malocclusion, however causes vary from one population to another. The aim of this study was to determine the relationship of crowding to mesio-distal tooth size and arch dimension in subjects with Class I normal and Class I malocclusion amongst both genders in subjects of Pakistani descent Subjects of Pakistani descent from both genders were assigned to two different categories based on crowding. Both categories had Class I molar relationship on occlusion. The crowded category had a minimum of 7mm of crowding or more and the non-crowded category had crowding or spacing not exceeding 1mm. Casts were obtained and measured for individual mesio-distal tooth size and bucco- lingual arch widths at selected points. Data was analyzed by calculating mean, variance, standard deviation and applying student’s T test. The results showed that the difference in arch width was statistically significant along all points of measurement between crowding and non-crowding group in both the genders with the crowding group having smaller arch dimensions in both the genders. There were more statistically significant differences in tooth size among females, with teeth in the crowded category being larger, however this was not true for all teeth. The results suggest that crowding is more likely to be due to smaller arch widths in males, whereas in females both small arch width and large teeth are to be blamed.

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