Avaliação comparativa da ultraestrutura e propriedades físicas do esmalte bovino, bubalino e humano

Abstract

This study aimed to compare the morphology and physical properties of the enamel structure of bovine, buffalo and human teeth. Analysis of this tissue was performed by scanning electron microscopy, mineral composition, microhardness and surface roughness of enamel in 41 buffalo incisors (Bos taurus indicus), 41 bovine incisors (Pelorovis antiques), and 30 human permanent incisors. The results showed a significant similarity between the ultrastructure of enamel in these animal species and the one found in human samples. The chemical elements which presented higher concentration in bovine and buffalo enamel were: O, Ca and P, precisely those that form hydroxyapatite crystals - Ca10 (PO4)6 (OH)2. Knoop microhardness values showed no statistically significant differences between the three species. However, the surface roughness of buffalo enamel (2.16μm ±0.23) was significantly higher when compared with human (0.36μm ±0.05) and bovine teeth (0.41μm ±0.07). It is concluded that the characteristics and properties of bovine and buffalo enamel, as obtained from our analysis and testing, showed a similar morphology to that of humans. They showed a similar ultrastructural architecture, microhardness and mineral composition equivalent to the human dental tissue, becoming reference models for research.