Effect of Different Solutions on Knoop Hardness of Indirect Composite Resins

Introduction: Indirect dental composites may have adequate clinical performance. However, the literature is scarce regarding indirect composite resins and these solutions should be considered to maintain their properties. The aim of the study was to evaluate the influence of beverages, mouthwashes and bleaching agents on the hardness of indirect composite resins. Methods: Five different brands of indirect composite resins were evaluated: Adoro, Resilab, Cristobal, Sinfony and Epricord. Ten specimens of each brand were immersed in eleven different solutions: four mouthwashes (Listerine, Oral-B, Plax, Periogard), four beverages (coke soft drink, red wine, coffee, orange juice), three dental bleaching agents (16% peroxide of carbamide, 7.5% and 38% peroxide of hydrogen) and artificial saliva (control group). The Knoop hardness was measured before (baseline) and after 12, 24, 36 and 60 hours of immersion in mouthwashes; after 7, 14 and 21 days of immersion in beverages and after 7 and 14 days of immersion in dental bleaching agents. The results were analyzed using 3-way repeated measures ANOVA and Tukey’s test (p<0.05). Results: All resins presented significant decrease on hardness values after immersion process whereas this reduction was higher for Resilab and Sinfony. The latter exhibited the lowest initial values of hardness while Cristobol resin presented the highest hardness values. The mouthwashes promoted a significant decrease in the hardness of specimens. *Corresponding author: Daniela Micheline dos Santos, Araçatuba Dental School, Univ Estadual Paulista – UNESP, Department of Dental Materials and Prosthodontics, Street: José Bonifácio, 1193 – Vila Mendonça, CEP 16015050 Araçatuba, São Paulo, Brazil, Tel: 55-18-3636-3287; Fax: 55-18-36363245; E-mail: [email protected] Received January 03, 2014; Accepted February 03, 2014; Published February 05, 2014 Citation: dos Santos DM, Massurani L, Goiato MC, Zavanelli AC, Haddad MF, et al. (2014) Effect of Different Solutions on Knoop Hardness of Indirect Composite Resins. Dentistry 4: 208. doi:10.4172/2161-1122.1000208 Copyright: © 2014 dos Santos DM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.