Methods: 44 dentistry students (21 male, 23 female) with permanent healthy dentition participated in this study. After making impression of maxilla and preparing maxillary casts, they were transferred to a semi adjustable articulator using air-bow. The tip of cusp of cupid and tips of buccal cusps of first and second premolars and molar teeth were determined by means of a coordinated measuring machine in three dimensions. The depth and radius of curve of spee of maxillary cast were analyzed by computer software (mechanical auto desk 2007). SPSS and T test were used for statistical significance (P<0.05).
Results: The curve of spee in maxilla showed a mean radius of 102.90 mm and had a depth of 1.64 mm. This curve was significantly deeper in subjects with oval face form and was not influenced by the gender.
Conclusions: In determining and reconstruction of plane of occlusion it seemed that to make a more precise curve of spee, the facial form of the patient must be considered.