Study and Comparison of Tooth Size and Arch Length in Angle Class III Malocclusion Between Nepalese and Chinese Population

Angle class III malocclusion are very hard to treat only by orthodontic method for most adults. So in this study we have measured The mesio-distal tooth size and arch length on the dental casts of total 39 pairs (17Chinese,22Nepalese) of Angle class III malocclusion, Upper lateral incisor, upper canine and upper second premolar shows significant difference between Nepalese and Chinese (P=0.02, P=.01, P=.003). Lower teeth show no significant difference between Nepalese and Chinese. Among Nepalese male and female lower lateral incisors, second premolar molar show significant difference (P=0.035, P=0.032, P=0.049), second premolar shows significant difference between Nepalese male and female (P=0.020). Among Chinese male and female shows no significant difference between upper teeth while lower first molar shows significant difference (P=0.041, P=0.00). For Nepalese OR 90.42 and AR 78.76 while for Chinese OR 89.58 and AR 78.16. No significant difference between Chinese and Nepalese OR and AR. Upper arch length for Nepalese male and female having angle class III malocclusion are 79.5 and 77 respectively. Lower arch length for Nepalese male and female with Angle class III malocclusion are 73.8 and 69.25. Among Nepalese upper arch length between male and female (P<0.05) shows significant difference but no significant difference between male and female in lower arch length (P>0.05). For Nepalese male the space lack for upper jaw is 3.7mm and for lower jaw 6.6mm.