Effects of different bleaching agent concentrations on surface roughness and microhardness of esthetic restorative materials

Bahannan, Salma A.

doi:10.1016/j.sjdr.2015.01.002

Cited by 20 publications

(31 citation statements)

References 16 publications

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“…The MHN of nanocomposites decreased with increase in concentration of CP. 21 This is in accordance with the present study. Tetric EvoCeram has glass fillers that have lesser wear and favorable polishing property, lower surface roughness, and high gloss compared with X-tra fill.…”

Section: Discussionsupporting

confidence: 94%

Effects of Bleaching Agents on the Microhardness and Surface Roughness of Bulk Fill Composites

Francis¹,

Pradeep

Ginjupalli

et al. 2017

World Journal of Dentistry

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Aim:The aim was to compare the effect of 10 and 20% carbamide peroxide (CP) on microhardness (MHN) and surface roughness of two commercially available bulk fill composites (X-tra fill Bulk Fill and Tetric EvoCeram Bulk Fill). Materials and methods:A total of 50 specimens with both type composites were prepared using brass molds of inner diameter 10 mm and a height of 4 mm. Each type of composite was further divided into three groups, control group stored in artificial saliva for 14 days, other groups bleached with 10 and 20% CP respectively, for 14 days. Microhardness of the composite resin was tested with a Vickers hardness tester, whereas surface roughness was tested with profilometer.Results: All the analysis was performed using Statistical Package for the Social Sciences version 18. The value of p < 0.05 was considered statistically significant. Both 10 and 20% CP significantly reduced MHN of experimental composite resins. However, the mean surface roughness was significantly higher in X-tra fill Bulk Fill than Tetric EvoCeram Bulk Fill at 20% CP concentration. The mean MHN of Tetric EvoCeram was reduced when compared with X-tra fill at 20% CP. Conclusion:There was a significant reduction in the MHN of restorative materials observed after exposure to CP under a clinically simulated bleaching regimen. However, increase in surface roughness was seen only at 20% CP. Clinical significance:The physical properties, such as MHN and surface roughness have a crucial effect on the longevity of restorations and, moreover, on the esthetic demands of patients, but they may be compromised by bleaching treatments. The aim of this research paper was to assess the reaction of home bleaching agents on the physical properties of two Bulk Fill composite resin restorative materials.

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Section: Discussionsupporting

confidence: 94%

Effects of Bleaching Agents on the Microhardness and Surface Roughness of Bulk Fill Composites

Francis¹,

Pradeep

Ginjupalli

et al. 2017

World Journal of Dentistry

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“…These results are in agreement with Taher (38) who found an average decrease in surface hardness of composite resin (Point-4), ormocer (Admira), compomer (Dyract AP), and resin-modified glass ionomer (Fuji II LC) restorative materials after bleaching with 35% hydrogen peroxide. Another study done by Bahannan (39) showed that the microhardness of nano composite resin (Filtek Supreme) and resin modified glass ionomer (Fuji II LC) specimens were significantly decreased after bleaching with 20% and 35% carbamide peroxide.…”

Section: Discussionmentioning

confidence: 99%

Effect of Two Different Bleaching Concentrations on Microleakage and Microhardness of Tooth-Colored Restorations (An in Vitro Study)

Ahmed

Mahmoud²,

Adel³

et al. 2016

Alexandria Dental Journal

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INTRODUCTION: Bleaching may exert some negative effects on existing resin restorations. OBJECTIVES: To evaluate the effect of bleaching with 14% and 40% hydrogen peroxide on microleakage and microhardness of different tooth-colored restorations. MATERIALS AND METHODS: MICROLEAKAGE TEST: Class V cavities were prepared on labial surfaces of 60 extracted human upper central incisor teeth. The teeth were divided into 2 groups: Group I: restored with FiltekZ350XT composite, Group II: restored with Fuji II LC resin-modified glass ionomer. The teeth were thermocycled, each group was subdivided into 3 subgroups: subgroup A: was not bleached and served as control, subgroup B: bleached with 14% hydrogen peroxide gel and subgroup C: bleached with 40% hydrogen peroxide gel. The teeth were immersed in dye, sectioned, and dye penetration was scored at the incisal and cervical walls under stereomicroscope. Data were analyzed using Repeated Measures ANOVA, Wilcoxon and Mann-Whitney tests. MICROHARDNESS TEST: 20 specimens (2mm thickness and 10mm diameter) were prepared from Filtek Z350XT composite, and Fuji II LC RMGI. Specimens were subjected to thermocycling, after which the microhardness of each specimen was measured before bleaching. Specimens were subdivided in to 2 subgroups, and bleached with 14%, 40% hydrogen peroxide gels. After bleaching, microhardness of each specimen was measured again. Data were analyzed using independent sample t-test and paired t-test. RESULTS: For microleakage test; statistical analysis showed no significant differences in microleakage of the tested composite and RMGI subgroups for incisal or cervical margins. For microhardness; the results showed significant increase in mean microhardness for the composite and RMGI subgroups bleached with 14% hydrogen peroxide, whereas, composite and RMGI subgroups bleached with 40% hydrogen peroxide showed significant decrease in mean microhardness. CONCLUSION: Bleaching did not have an effect on microleakage of Filtek Z350XT composite and Fuji II LC RMGI restorations, while they affected the microhardness of these restorations.

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“…The impact of bleaching agents on surface roughness of restorative materials could be considered concentration dependent with studies proving an increase in surface roughness noted between 20% and 35% carbamide peroxide. [ 21 ] It was claimed that this difference could be due to the chemical degradation of resin matrix by the concentration or repeated application of peroxide. In addition, if the bleaching agent degraded the coupling agent of resin composites, the resultant roughness would be exaggerated.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, if the bleaching agent degraded the coupling agent of resin composites, the resultant roughness would be exaggerated. [ 21 22 23 ]…”

Section: Discussionmentioning

confidence: 99%

Effect of staining and bleaching on color stability and surface roughness of three resin composites: An in vitro study

et al. 2018

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Effects of different bleaching agent concentrations on surface roughness and microhardness of esthetic restorative materials

Cited by 20 publications

References 16 publications

Effects of Bleaching Agents on the Microhardness and Surface Roughness of Bulk Fill Composites

Effects of Bleaching Agents on the Microhardness and Surface Roughness of Bulk Fill Composites

Effect of Two Different Bleaching Concentrations on Microleakage and Microhardness of Tooth-Colored Restorations (An in Vitro Study)

Effect of staining and bleaching on color stability and surface roughness of three resin composites: An in vitro study

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