Análise comparativa da morfologia externa de coroas dentárias esculpidas e naturais

Abstract

This basic study evaluated the morphology of 42 single-unit prosthetic crowns fabricated by dental technicians, using classical dental anatomy literature as a comparative standard. To this end, the study analyzed the orientation, dimensions, and vestibulo-lingual and mesio-distal diameters of the tooth surfaces, as well as the number of cusps. A 100% convergence with the literature was found both in the vertical direction of the free and proximal surfaces and in the vertical dimension of the buccal and lingual surfaces. The data showed that 19.05% of the teeth evaluated based on the vertical dimension of the proximal surfaces exhibited divergence. Of this total, the group of upper central incisors stood out with 100% discrepancy. There was a 30.95% rate of divergence in the horizontal direction of the free surfaces and in the horizontal dimension of the proximal surfaces, while the horizontal direction of the proximal surfaces and the horizontal dimension of the buccal and lingual surfaces showed 28.57% divergence. Regarding the vestibulo-lingual and mesio-distal diameters, the variations were concentrated in the upper posterior teeth, totaling 16.67% divergence in the 24 elements analyzed. Under the criterion of the number of cusps, the discordance rate was 8.33%, with variations occurring specifically in the lower first molars. It is concluded that the greatest challenges in morphological reproduction are concentrated in the horizontal dimension, followed by the vertical dimension of the proximal surfaces, with the upper central incisors standing out in the latter criterion. Variations in the vestibulo-lingual and mesio-distal diameters were restricted to the upper posterior teeth, while the number of cusps showed disagreement limited to the lower first molars. There was complete agreement regarding the vertical orientation of the free and proximal surfaces and the vertical dimension of the buccal and lingual surfaces.