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Effect of two bleaching agents; hydrogen peroxide 40% and carbamide peroxide 20% on the surface roughness of microhybrid and nanohybrid composites; an in-vitro study
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Leyla Zohrahvand *   , Maryam Hoorizad ghang kar , Mahsa Nader shahbaz |
| Department of Restorative Dentistry, Islamic Azad University & dental office , Lzohrevand715@gmail.com |
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Abstract: (93 Views) |
Abstract
Background&Aim: The aim of this study was to compare the effect of two bleaching agent, hydrogen peroxide 40% and carbamide peroxide 20% on the surface roughness of two types of composite resins: microhybrid and nanohybrid .
Materials and Methods: In this experimental study, 60 nanohybrid and microhybrid composite disks with a diameter of 10 mm and a thickness of 2 mm were prepared. After measuring the initial surface roughness, the specimens in each composites group were divided into three subgroups: control, 20% carbamide peroxide and 40% hydrogen peroxide(n=10).In the control subgroup, the specimens were stored in distilled water for 14 days ,with the water changed daily.The specimens in the 20% carbamide peroxide group were exposed to the bleaching agent for 4 hours daily for 14 consecutive days according to the manufacture’s instructions.The specimens in the 40% hydrogen peroxide group were exposed to the bleaching agent for 60 minutes in three 20- minutes in one day, according to the manufacture’s instructions. Surface roughness of all specimens was then remeasured using a profilometer.Data were analyzed using t-test,repeated measure ANOVA,post-hoc test,and 3 -way ANOVA with Pass11 software.
Results: In all groups,regardless of the type of bleaching agent, surface roughness after bleaching was significantly higher than the control group (p=0.0001). In the microhybrid composite group, specimens exposed to 40% hydrogen peroxide showed greater surface roughness than those exposed to 20% carbamide peroxide (p=0.339).
Conclusion: Bleaching agents can affect the surface roughness of resin composite restorations, also, type of bleaching agent and restorative material may affect these changes.
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Article number: 4 |
| Keywords: surface roughness, resin composite, dental material, tooth bleaching agent, hydrogen peroxide, carbamide peroxide |
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Full-Text [PDF 642 kb]
(76 Downloads)
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Type of Study: original article |
Subject:
restorative dentistry
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