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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microhardness of a dental restorative composite resin containing nanoparticles polymerized with argon ion laser

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Author(s):
Delfino, Carina Sincler [1] ; Youssef, Michel Nicolau [2, 3] ; De Souza, Fabio Barbosa [4] ; Braz, Rodivan [5] ; Turbino, Miriam Lacalle [2]
Total Authors: 5
Affiliation:
[1] Univ Cruzeiro UNICSUL, Sch Dent, BR-0806070 Sao Paulo - Brazil
[2] Univ Sao Paulo, Dept Restorat Dent, Sch Dent, Sao Paulo - Brazil
[3] Univ Cruzeiro UNICSUL, Div Postgrad, Sch Dent, Sao Paulo - Brazil
[4] State Univ Rio Grande Norte, Caico, RN - Brazil
[5] Univ Fed Pernambuco, Recife, PE - Brazil
Total Affiliations: 5
Document type: Journal article
Source: OPTIK; v. 123, n. 3, p. 263-267, 2012.
Web of Science Citations: 0
Abstract

The objective of this study was to compare the microhardness of two resin composites (microhybrid and nanoparticles). Light activation was performed with argon ion laser 1.56J (L) and halogen light 2.6J (H) was used as control. Measurements were taken on the irradiated surfaces and those opposite them, at thicknesses of 1, 2 and 3 mm. To evaluate the quality of polymerization, the percentages of maximum hardness were calculated (PMH). For statistical analysis the ANOVA and Tukey tests were used (p <= 0.05). To microhybrid was shown that the hardness with laser was inferior to the hardness achieved with halogen light, for both the 1 mm and 2 mm. The nanoparticles polymerized with laser, presented lower hardness even on the irradiated surface, than the same surface light activated with halogen light. The microhybrid attained a minimum PMH of 80% up to the thickness of 2 mm with halogen light, and with laser, only up to 1 mm. The nanoparticles attained a minimum PMH of 80% up to 3 mm thickness with halogen light and with laser this minimum was not obtained at any thickness. Based on these results, it could be concluded that light activation with argon ion laser is contra-indicated for the studied nanoparticles. Published by Elsevier GmbH. (AU)