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KMID : 1035320170440030273
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Korean Society for Dental Materials
2017 Volume.44 No. 3 p.273 ~ p.280
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Effects of specimens dimension on the flexural properties and testing reliability of dental composite resin
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Im Youn-Woon
Hwang Seong-Sig
Kim Sa-Hak
Lee Hae-Hyoung
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Abstract
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The aim of the present study was to investigate the effects of specimen dimension on the flexural properties and testing reliability of dental composite resin. The composite resin was prepared experimentally by mixing a resin matrix with silanated micrometer glass filler at 50 vol%. Flexural specimens with various dimension in specimen’s width were fabricated by light curing using a split metal mold; 25×2×2 mm, 25×2×4 mm, 25×2×6 mm in length × height × width. The flexural strength and modulus were determined according to ISO 4049 test protocol at a span length of 20 mm (normal-flexural strength; NFS). Another flexural test was conducted using mini-sized specimens (12×2×2 mm, 12×2×4 mm, 12×2×6 mm) from the broken specimens at a span length of 10 mm (mini-flexural strength; MFS). Data were analyzed with ANOVA and Duncan’s post-hoc test and the test reliability was evaluated by Weibull analysis. Results showed that there are generally no significant difference in flexural strength with the increase in the specimen width in NFS and MFS tests. However, the test reliability of flexural strength based on Weibull analysis was largely changed with the variables in the dimension of width and span length. The flexural modulus of NFS was increased as the dimension of specimens width increased while there was no trend in flexural modulus of MFS test. Overall results recommend that the evaluation of flexural properties and the reliability of dental composite resins should be performed with more than one test method.
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KEYWORD
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composite resin, flexural properties, Weibull reliability, specimen dimension
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