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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.)

Impact of the distance of light curing on the degree of conversion and microhardness of a composite resin

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Author(s):
Catelan, Anderson [1] ; Napoleao De Araujo, Larissa Sgarbosa [1] ; Martins Da Silveira, Bruna Cilene [1] ; Kawano, Yoshio [2] ; Bovi Ambrosano, Glaucia Maria [3] ; Marchi, Giselle Maria [1] ; Baggio Aguiar, Flavio Henrique [1]
Total Authors: 7
Affiliation:
[1] Univ Estadual Campinas, Piracicaba Sch Dent, Dept Restorat Dent, BR-13414903 Piracicaba, SP - Brazil
[2] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Sao Paulo - Brazil
[3] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Social Dent, Piracicaba, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ACTA ODONTOLOGICA SCANDINAVICA; v. 73, n. 4, p. 298-301, MAY 2015.
Web of Science Citations: 5
Abstract

Objective. This study evaluated the impact of the distance between the light guide tip of the curing unit and material surface on the degree of conversion and Knoop microhardness of a composite resin. Materials and methods. Circular samples were carried out of a methacrylate micro-hybrid resin-based composite and light cured at 0, 2 and 4 mm distance. Monomer conversion rate was measured using a Fourier-transform Raman spectrometer and Knoop hardness number was obtained using a microhardness tester on the top and bottom surfaces. Data were statistically analyzed by analysis of variance and Tukey's test (alpha = 0.05). Results. Overall, the increase of curing distance reduced the microhardness (p <= 0.05), but did not influence the carbon double bond conversion rate (p > 0.05) of the composite resin tested; and the top surface showed better properties compared to the bottom (p <= 0.05). Conclusions. The light curing at distance can reduce mechanical properties and could affect long-term durability of the composite restorations. Thus, the use of a curing device with high irradiance is recommended. (AU)

FAPESP's process: 10/18465-1 - Effect of curing light distance on the degree of conversion, microhardness and crosslink density of metacrylate and silorane composite resin-based
Grantee:Bruna Cilene Martins da Silveira
Support Opportunities: Scholarships in Brazil - Scientific Initiation