The role of surface sealants in the roughness of composites after a simulated toothbrushing test

Author(s)

Cilli, Renato ^[1] ; Ribeiro de Mattos, Maria Cecilia ^[1] ; Honorio, Heitor Marques ^[2] ; Rios, Daniela ^[3] ; de Araujo, Paulo Amarante ^[1] ; Prakki, Anuradha ^[4]

Affiliation

^[1] Univ Sao Paulo, Bauru Dent Sch, Dept Operat Dent Endodont & Dent Mat, BR-17012901 Sao Paulo - Brazil

^[2] Alfenas Fed Univ, Dept Pediat Dent, BR-37130000 Alfenas, MG - Brazil

^[3] Univ Sao Paulo, Bauru Dent Sch, Dept Pediat Dent Orthodont & Publ Hlth, BR-17012901 Sao Paulo - Brazil

^[4] Univ Toronto, Fac Dent, Toronto, ON M5G 1G6 - Canada

• Document type: Journal article
• Source: Journal of Dentistry; v. 37, n. 12, p. 970-977, DEC 2009.
• Web of Science Citations: 16

Abstract

Objectives: To evaluate the influence of two surface sealants (BisCover/Single Bond) and three application techniques (unsealed/conventional/co-polymerization) on the roughness of two composites (Filtek Z250/Z350) after the toothbrushing test. Methods: Seventy-two rectangular specimens (5 mm x 10 mm x 3 mm) were fabricated and assigned into 12 groups (n = 6). Each sample was subjected to three random roughness readings at baseline, after 100,000 (intermediate), and 200,000 (final) toothbrushing strokes. Roughness (R) at each stage was obtained by the arithmetic mean of the reading of each specimen. Sealant removal was qualitatively examined (optical microscope) and classified into scores (0-3). Data were analyzed by Student's paired t-test, two-way ANOVA/Tukey's test, and by Wilcoxon, Kruskal-Wallis and Miller's test (alpha = 0.05). Results: Z250 groups at baseline did not differ statistically from each other. Unsealed Z350 at baseline had lower R values. All the unsealed groups presented gradual decrease in R from baseline to final brushing. From baseline to the inter-mediate stage, Z250 co-polymerized groups presented a significant reduction in R (score 3). Conventionally sealed groups had no significant changes in R (scores 2-0.8). From baseline to the intermediate stage, the conventionally sealed Z350 Single Bond group had an increase in R (score 1.5). In the final stage, all the conventionally sealed groups presented a reduction in R (scores 0.7-0). Co-polymerized Single Bond groups had a significant reduction in R (scores 2.5-2.7), and co-polymerized BisCover groups an increase in R (scores 2.8-3). Conclusions: At any brushing stage, sealed composites presented superior performance when compared with unsealed composites. (C) 2009 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 08/06170-7 - Dentin matrix stabilization following treatment with different crosslinking agents: Effect on dentin bonding.
• Grantee: Renato Cilli
• Support Opportunities: Scholarships in Brazil - Post-Doctorate