Abstract
Objective: This study evaluated the surface roughness of a nanofilled composite resin submitted to different degrees of erosion and methods of control.Methods: 120 cylindrical composite specimens (6×1.5 mm) were randomly divided into four groups, according to the surface protection against the erosive challenge [negative control, topical application of fluoride, glass-ionomer sealant, resin sealant]. After the application of the respective method, specimens were divided into three subgroups (n=10): a) absence of erosive challenge; b) 9 cycles of DES-RE; c) 18 cycles of DES-RE. Surface roughness (Ra, μm) was recorded and statistically analyzed (2-way Anova/Tukey).Results: The glass-ionomer sealant exhibited less rough surfaces under all the conditions. However, the average roughness was significantly higher after 18 DES-RE cycles.Conclusion: Despite the potential shown by glass-ionomer sealant, it was concluded that no material prevented an increase in surface roughness of the nanofilled composite after an intense erosive challenge.
Highlights
Composite resins are restorative materials, which are widely used and increasingly so for aesthetic dentistry
Composite resin can be used as a restorative material in areas where there has been loss of dental structure, in patients who have dental erosion and whose teeth come into frequent contact with acidic substances [1, 2]
No significant interaction was observed between the main factors “surface protection” and “erosive challenge” (p=0.58), indicating no dependent relation between them
Summary
Composite resins are restorative materials, which are widely used and increasingly so for aesthetic dentistry. They can be recommended for both posterior and anterior teeth as they exhibit good esthetics and excellent mechanical properties [1]. Composite resin can be used as a restorative material in areas where there has been loss of dental structure, in patients who have dental erosion and whose teeth come into frequent contact with acidic substances [1, 2]. Erosion caused by exposure to gastric acid does not happen in a continuous sequence but by acid contact with the tooth, generally in several daily episodes [5]. It has already been verified that gastric juice causes more erosion than carbonated drinks, this being directly associated with a lower pH and titratable acidity [6]
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