Abstract
Objective: To evaluate the topography and microhardness of composite resin restorations submitted to different finishing and polishing systems before and after erosive challenge. Material and Methods: Thirty standardized cavities prepared in enamel-dentin blocks of bovine incisors were restored with Z350 composite resin, and randomly distributed into three groups (n=10) according to the finishing and polishing systems: G1 = Soflex 4 steps, G2 = Soflex Spiral 2 steps and G3 = PoGo (single step). The specimens were half protected with nail varnish and submitted to five immersions in Pepsi Twist®, for 10 minutes each, five times/day during six consecutive days. The initial and final challenge surface microhardness (SMHinitial and SMHfinal) of the composite resin was evaluated and the percentage of SMH loss (%SMHL) was calculated. After protection removal, the topographic change linear (Ra) and volumetric (Sa) roughness was evaluated in initial and final areas by using 3D non-contact optical profilometry and scanning electron microscopy (SEM). Data were analyzed by paired Student's t-test, Kruskal-Wallis test, and by ANOVA and Tukey’s test. Results: There was significant intra-group %SMHL in composite resin (p<0.05). Differences among groups in %SMHL, Ra/Sa in resin composite were not observed (p>0.05). SEM images revealed structural changes between the initial and final surfaces for all groups. Conclusion: The three types of finishing and polishing systems had a similar influence on %SMHL, Ra and Sa in the nanofilled composite resin.
Highlights
Dental erosion is a localized, chronic, pathological, and painless loss of mineralized dental tissue due to the exposition to acids, without direct bacterial involvement [1]
Objective: To evaluate the topography and microhardness of composite resin restorations submitted to different finishing and polishing systems before and after erosive challenge
The three types of finishing and polishing systems had a similar influence on %SMHL, Ra and surface roughness (Sa) in the nanofilled composite resin
Summary
Dental erosion is a localized, chronic, pathological, and painless loss of mineralized dental tissue due to the exposition to acids, without direct bacterial involvement [1]. This can be influenced by Intrinsic factors such as diseases that cause regurgitation of gastric juices or decreasing of the salivary flow, as well as by extrinsic factors linked to diet (consumption of fruits and acid drinks) harmful environments (chemical industries and swimming pools treated with chlorine), and some medicines (aspirin, vitamin C and Hydrochloric acid) [2]. Changes in the lifestyle of the individuals have significantly increased the consumption of acidic beverages, which contributes to the onset of dental erosion [3] This is a clinical matter of concern. In the field of restorative dentistry, it has been proved that the action of acidic beverages on resin composites may cause changes in their microhardness due to the disruption of the interactions between the monomers present in their polymeric matrixes [4]
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