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ORIGINAL ARTICLE
Year : 2019  |  Volume : 16  |  Issue : 4  |  Page : 264-270

Effect of bleaching protocols on surface roughness and biofilm formation on silorane-based composite resin


1 Department of Operative Dentistry; Dental and Periodontal Research Center,Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran
2 Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran
3 Department of Operative Dentistry, Dental Faculty, Ahvaz Jundishapur Medical Sciences University, Ahvaz, Iran

Correspondence Address:
Dr. Sarah Gholizadeh
Department of Operative Dentistry, Dental Faculty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1735-3327.261125

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Background: Knowledge about the effect of bleaching on behavior of composite resins is important to find a suitable composite resin for restoration of teeth undergoing bleaching. This study aimed to assess the effect of different bleaching protocols on surface roughness and biofilm formation on a silorane-based composite resin. Materials and Methods: In this in vitro experimental study, 60 silorane-based composite resin samples measuring 3 mm in thickness and 6 mm in diameter were fabricated and polished. They were then randomly divided into four groups (n = 15). In Group 1, samples were stored in distilled water as control. Samples in Groups 2, 3, and 4 were subjected to bleaching with 15% carbamide peroxide, 35% hydrogen peroxide, and 35% hydrogen peroxide activated by light, respectively. Surface roughness was measured using a profilometer. Streptococcus mutans cultured in brain-heart infusion broth was used for the assessment of biofilm formation on the samples. The bacterial colonies were counted using the pure-plate technique. Data were analyzed using one-way ANOVA and post hoc Tukey's tests. Regression model was used to assess the association between surface roughness and biofilm formation (P < 0.05). Results: The mean surface roughness of the four groups was not significantly different (P = 0.11); however, a significant difference was noted in the mean biofilm formation among the groups (P = 0.00). Conclusion: Bleaching decreased biofilm formation. The lowest biofilm formation was noted in the group subjected to light-activated 35% hydrogen peroxide. Increased surface roughness enhanced biofilm formation to a certain level; excessive roughness did not increase biofilm formation.


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