Abstract
Objective: Even resin composites and glass-ionomer cements are widely used for dental cervical region restorations, under erosive condition they can wear out quickly. This study aimed to compare, by means of bond strength by microshear, the performance of a resin composite (RC) and a resin-modified glass-ionomer cement (RMGIC) to eroded dentin and its association with 2% chlorhexidine up to 6 months. Material and Methods:. Eighty sound third molars teeth were cutt to obtain flat coronal dentin, which were subsequently embedded in self-curing acrylic resin circular molds exposing only this surface available. Teeth were divided into two groups, according to the treatment with the Adper Single Bond 2 + RC Filtek Z250 (Z) or the RMGIC Vitremer (V). Half of the specimens were immersed in artificial saliva-AS for 24 hours (control groups) and half subjected to 3x/1 minute daily immersion in Regular Coca Cola ®-RC for 5 days. Half of the specimens for each described condition were treated with water and half with 2% chlorhexidine for 1 minute prior the restoration. For all groups, the specimens were stored in artificial saliva weekly renewed up to tests. The bonding strength was evaluated by microshear test after 1 month and 6 months . Data, in normal distribution, were analyzed with 3-way ANOVA and Tukey (p <0.05). Results: Challenge factors, materials and time were statistically significant.. Restorations with Z showed significantly higher bond strength compared to V in all situations. There was a reduction in bond strength values over time for all tested conditions. The prior application of 2% chlorhexidine was able to preserve the Z bond strength between 1 and 6 months, but this factor was not statistically significant. Conclusion: For eroded dentin, the use of resin composite seems presents greater bond strength compared to resin-modified glass-material, disregarding their association to chlorhexidine or not.
Highlights
I n oral environment, there are different chronic and destructive processes, which can affect teeth beyond the dental caries, resulting in loss of minerals that culminate in irreversible loss of tooth structure [1]
The interest in studying dental erosion has increased in recent years, mainly due to the increasing consume of drinking acidic products, especially soft drinks and citric juices [9,10,11]
For Z groups, the bond strength significantly decreased with time
Summary
I n oral environment, there are different chronic and destructive processes, which can affect teeth beyond the dental caries, resulting in loss of minerals that culminate in irreversible loss of tooth structure [1]. Noncarious lesions can be caused by mechanical events as abrasion, attrition, and abfraction or due to chemical process as erosion [1,2,3]. The dental erosion stands out, among these events, consisting on a multifactorial condition in which chemical, biological and behavioral factors interact and determine why some individuals exhibit a greater erosion level than others [4,5]. Erosive process is defined as a process that involves two steps: smoothing of the surface, which under continuous chemical challenge associated or not to abrasive process, can be wear out, exposing a new sub layer [6,7]. The acidic condition, buffer capacity of saliva, frequency and intensity of erosive challenge are relevant factors to modulate this process [8]. The interest in studying dental erosion has increased in recent years, mainly due to the increasing consume of drinking acidic products, especially soft drinks and citric juices [9,10,11]
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