Resumo

PEREZ, V. et al. Enzyme concentration AST (aspartate transaminase) teeth in orthodontic forces under intrusive. Av Odontoestomatol [online]. 2017, vol.33, n.1, pp.19-24. ISSN 2340-3152.

Background: Reports in the literature describe as orthodontic forces applied during dental movements lead to pulp reactions, alterations and discomfort in orthodontic treatment. Aspartate aminotransferase (AST) is an enzyme classified as an indicator of cell necrosis; However, it is necessary to evaluate their activity in teeth subjected to various forces applied during orthodontic treatment. Objective: To compare aspartate aminotransferase concentrations in teeth pulp tissue subjected to intrusive orthodontic forces and forces free teeth. Method: A quasi-experimental study of mouth divided into 34 premolars from 20 subjects requiring removal thereof for orthodontic purposes was performed. 20 premolars were exposed for 48 hours to intrusive forces (75 g/force). Contralateral teeth were used as control group. the pulp tissue was removed and the concentration of AST was measured. statistical significance of p <0.05 was taken into account. Results: When making comparisons of enzyme concentrations in both groups not a statistically significant difference (p= 0.436) was found. The control group showed an average concentration of 1.78±1.13 U/mg while the premolars exposed to intrusive forces reported an average of 1.94±1.2 U/mg. Conclusion: AST activity level does not vary pulp tissue by inducing movements intrusive forces approximate 75 g/force.

Palavras-chave : Aspartate aminotransferase; intrusive force; pulp tissue; orthodontics.

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