Influence of environmental conditions on properties of ionomeric and resin sealant materials.
OBJECTIVE
The aim of this study was to determine the effect of environmental conditions on the degradation of ionomeric and resin sealant materials.


METHODS
FluroShield, Vitremer, and Ketac Molar disc-shaped specimens (n=18/material) were prepared, polished, subjected to initial hardness and roughness readings. Six discs of each material were randomly assigned to one of three different storage solutions: 0.3% citric acid (CA), demineralization solution (DE), and remineralization solution (RE). The specimens were individually immersed in 3 mL of the test solutions, which were daily changed. After 15 days of storage, new surface roughness and hardness readings were done. Fluoride release in the solutions was measured within 15 days. Data were analyzed by ANOVA and Tukey's and Contrast tests (alpha=0.05).


RESULTS
The storage in CA increased the roughness of Vitremer and Ketac Molar. A significant reduction in hardness was observed for all materials after storage in all solutions. For all materials, the greatest amounts of fluoride release occurred during the 1st day. FluroShield presented the same patterns of fluoride release in all solutions. Ketac Molar and Vitremer released the highest amounts of fluoride in the CA solution.


CONCLUSIONS
Ionomeric materials are more susceptible to degradation than resin-based materials under acidic conditions. Acidic conditions lead to a higher fluoride release from ionomeric materials.
Kantovitz
Kamila Rosamilia
KR
Department of Pediatric Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Pascon
Fernanda Miori
FM
Correr
Gisele Maria
GM
Alonso
Roberta Caroline Bruschi
RC
Rodrigues
Lidiany Karla Azevedo
LK
Alves
Marcelo Correa
MC
Puppin-Rontani
Regina Maria
RM
D000704:Analysis of Variance; D003764:Dental Materials; D006801:Humans; D014089:Tooth Remineralization
D003764:Dental Materials