Journal of Conservative Dentistry
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Year : 2013  |  Volume : 16  |  Issue : 4  |  Page : 356-361

Effects of home bleaching on surface hardness and surface roughness of an experimental nanocomposite

1 Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia 16150, Kubang Kerian, Kelantan, Malaysia
2 Klinik Pergigian Hospital, Bukit Mertajam, Pulau Pinang, Malaysia

Correspondence Address:
Ab-Ghani Zuryati
School of Dental Sciences, Health Campus, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan
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Source of Support: USM RU Grant 1001/PPSG/813012, Conflict of Interest: None

DOI: 10.4103/0972-0707.114362

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Objective: Home bleaching agents may not be safe for composite resins. The purpose of this study was to evaluate the effects of 10 and 20% Opalescence ® PF home bleaching agents on the surface roughness and hardness of universal nanocomposite (Filtek Z350), anterior nanocomposite (KeLFiL), and nanohybrid composite (TPH 3). Materials and Methods: Fifty-four composite resin samples with 18 samples for each type of composite resin were prepared using acrylic molds (4 × 2 mm). Each type of composite resin was further divided into three groups [n = 6 controls were placed in distilled water for 14 days and the other two groups of n = 6 were bleached with 10 and 20% carbamide peroxide (CP), respectively for 14 days]. Surface hardness of the composite resin was tested with a Vickers hardness tester, whereas surface roughness was tested with atomic force microscopy (AFM). Results: There were significant changes in the surface hardness of KeLFiL and TPH 3. However, all the tested materials showed no significant changes in the surface roughness. Conclusion: After 14 days of home bleaching treatment, there was no adverse effect on the surface roughness of all three composite resins, although the surface hardness for KeLFiL and TPH 3 were significantly reduced.

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