بررسي كليدهاي اكلوژن نرمال در افراد 14 تا 18 ساله شهر اصفهان در سال 1374

Evaluation of six keys of normal occlusion of the 14-18 year old group in Isfahan in 1374

Aim: To achieve Andrews six keys of occlusion is a component of treatment goals of each orthodontist. Present study was carried out in order to evaluate six keys in 40 dental casts with normal occlusion. Method & Material: In this descriptive, cross sectional study molar relationship, existence of space between teeth and dental rotation was evaluated and curve of spec, crowns angulation and inclination of teeth was measured. Results: The results of this study showed that although Andrews normal keys exist in our samples, some differences are observed including the following: 1) The mean of angulation and inclination angles of crown of some teeth werenʹt similar to Andrews samples and these differences are statistically significant 2) The curve of spee wasnʹt completely flat in any of our samples 3) In some cases a small space (lower than 0.5mm) existed distal to the lower canine or mesial to the upper canine. Conclusion: The differences that been _observed between results of present and Andrewsʹ study can be due ethenic difference between two groups samples.