The objective of this study was to evaluate some clinical aspect of the crown inclination in Korean´s naturally occuring optimal occlusion, and to statistically compare the crown inclination at Andrews´ FA points group and another bracket slot level group based on marginal ridges. The materials consisted of study models of 30 patients (14; Korean´s males, 16; Korean´s females) who have nonorthodontic normal occlusion. The results were as follows; 1. Mean, standard deviation, range of clinical inclination in the Andrews´ FA points and another bracket slot level were obtained. 2. Statistically difference between Andrews´ FA points group and bracket slot level group based on marginal ridge was non significant (p>0.05). But standard deviation and range in FA points group was more stability than marginal ridge group. 3. A lingual crown inclination at FA points in the upper posterior teeth existed (canines through molars). 4. The lingual crown inclination at FA points in the lower dentition progressively increased from the incisors through the second molars.