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The effects of polishing and home bleaching on surface roughness of composites

Published in Ektodermal Displazi Grubu - Türkiye
2020
Volume: 13
   
Issue: 3
Pages: 951 - 956
Abstract

The aim of this study was to investigate the effect of both polishing and home bleaching agent on the surface roughness of two different composite brands. Two types of direct composite restorative material of A2 shade were selected for this study: Filtek Z250 XT nanohybrid universal composite restorative material (3M ESPE) and Tetric N-Cream nanohybrid universal composite restorative material (Ivoclar Vivadent). Thirty specimens were prepared from each composite material represented by the letter A for 3M composite and the letter B for Tetric composite (total number of specimens were 60). Each specimen was prepared by compressing sufficient amount of material into a mould of 5 mm in diameter and 2 mm in thickness by two glass slides with acetate celluloid strip in between and curing the specimen by making the curing tip in intimate contact with the acetate celluloid strips covering the composite top surface with LED Woodpacker light curing unit for 20s with an LED of output 600 mW/cm2. The bottom surface of each sample were marked. All samples were stored in plastic containers with 2ml distilled water for 24 hours at room temperature. The thirty specimens of each group were sub divided into three subgroups (n=10): A1/B1 were the control subgroups (cured only), A2/B2 were the polished subgroups (cured and polished) and A3/B3 were the bleached subgroups (cured, polished and bleached) which were bleached using home-type bleaching agent containing 9.5% hydrogen peroxide (PHILIPS ZOOM /DayWhite).Then, surface roughness of the 60 samples (top surfaces) were measured and recorded (Ra) value in μm using a profilometer surface roughness tester (Mitutoyo Surftest SJ-400). Data was statistically analysed by comparing surface roughness values of the sixty specimens for their tops with one way ANOVA and t-test at 5% level of significance. Statistical analysis of the data revealed that, there was a statistically significant difference between the 6 subgroups being tested in their surface roughness values (ANOVA, p≤ 0.05) for their tops surfaces.There was a statistically significant increase in the surface roughness of the polished composite samples after being bleached with 9.5% hydrogen peroxide.There was insignificant difference (Paired Samples Test p≥ 0.05) in the surface roughness between the two major groups A & B. Polishing of composite restorative material is an important step to be done before and after bleaching procedure in order to minimize the surface roughness that can lead to biofilm accumulation and stains retention. Clinically, there is no need to replace composite restorations after bleaching from surface roughness aspect. Knowledge about the effect of bleaching on the properties and behaviour of composite resins is important to use the most suitable composite resin for restoration of teeth undergoing bleaching. By doing so, the need for composite resin restoration change due to possible complications caused by bleaching treatment is obviated

About the journal
JournalJournal of International Dental and Medical Research
PublisherEktodermal Displazi Grubu - Türkiye
ISSN1309-100X
Open AccessYes