Abstract
Up to now there have been numerous papers concerning the similarity between facial form and maxillary central incisor tooth form.
This study attempts to adapt the Fourier series to examine the similarity between facial form and maxillary central incisor tooth form. Data used in this study was obtained from facial forms and plaster casts of maxillary central incisor tooth forms of 40 Filipino males and 70 females. A modified version of Pöch's ten-category pattern was used as a categorization standard. A value of less than 0.3 calculated using the Fourier series was used as the standard for similarity between facial form and maxillary central incisor tooth form.
When facial forms were categorized according to the similarity standard, the most frequent category pattern for both males and females was an ellipsoid form. Oval was the most common form of the maxillary central incisor in both the right and left sides for males, while a rhomboid form on the right and a round form on the left were the most common in females. When combinations of facial forms and maxillary central incisor forms were categorized, groups appearing in the same category pattern amounted to 12 for both sides in males and 20 for both sides in females.
The similarity rate between facial form and maxillary central incisor form was 71. 5% for the right and 71.43% on the left in males, and 78.95% on the right and 75. 81% on the left in females. Based on this information, we can say that, while facial form and maxillary central incisor form do not necessarily fall into the same category patterns, they display a similarity rate of approximately 70%.
