Artículos de revistas
Proteolytic activity, degradation, and dissolution of primary and permanent teeth
Fecha
2020-09-01Registro en:
International Journal of Paediatric Dentistry, v. 30, n. 5, p. 650-659, 2020.
1365-263X
0960-7439
10.1111/ipd.12632
2-s2.0-85081252641
Autor
Universidade Estadual Paulista (Unesp)
Universidade Estadual de Campinas (UNICAMP)
Augusta University
University of Kentucky
Universidade Estadual de Maringá (UEM)
University of Michigan
Universidade de São Paulo (USP)
University of Ribeirão Preto - Unaerp
Institución
Resumen
Background: Primary and permanent teeth composition may influence dissolution and degradation rates. Aim: To compare the dissolution and degradation of primary and permanent teeth. Design: Enamel and dentin powders were obtained from primary molars and premolars and incubated within different pH buffers. Calcium and inorganic phosphate release was quantified in the buffers by atomic absorption and light spectrophotometry. A colorimetric assay was used to assess the MMP activity of primary dentin (PrD) and permanent dentin (PeD). Collagen degradation was assessed by dry mass loss, change in elastic modulus (E), and ICTP and CTX release. Data were submitted to ANOVA and Tukey's tests (α = 0.05). Results: Similar dissolution was found between PrD and PeD after 256 hours. At pH 4.5, enamel released more minerals than dentin whereas at pH 5.5 the inverse result was observed. MMP activity was similar for both substrates. PrD showed higher dry mass loss after 1 week. In general, greater reduction in E was recorded for PrD. Higher quantities of ICTP and CTX were released from PrD after 1 week. Conclusions: Primary and permanent teeth presented similar demineralization rates. Collagen degradation, however, was faster and more substantial for PrD.