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Influence of ceramic thickness on mechanical properties and polymer structure of dual-cured resin luting agents.


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タイトル: Influence of ceramic thickness on mechanical properties and polymer structure of dual-cured resin luting agents.
著者: Meng, Xiangfeng / Yoshida, Keiichi / Atsuta, Mitsuru
発行日: 2008年 5月
引用: Dental Materials 24(5) pp.594-599, 2008
抄録: OBJECTIVE: To investigate the influence of ceramic thickness on the mechanical properties and polymer structure (degree conversion and cross-linking density) of three dual-cured resin luting agents. METHODS: Three dual-cured resin luting agents [Linkmax HV (GC), Nexus 2 (Kerr), and Variolink IIHV (Ivoclar-Vivadent)] were polymerized with or without 800mW/cm(2) irradiation through 0-3-mm-thick GN-I (GC) machinable ceramic. Bar-shape specimens were subjected to three-point bending to determine flexural strength (FS) and elastic modulus (EM) after dry storage at 37 degrees C for 24h. Knoop hardness was measured on the irradiated surface of disk-shaped specimens before (KHN1) and after (KHN2) storage of 100% ethanol solution at 37 degrees C for 24h. KHN1 and KHN2 were estimated as indirect indicators of degree of conversion (DC) and cross-linking density, respectively. Data were analyzed by one-way ANOVA and Student-Newman-Keuls test for each luting agent, and four mechanical properties were subjected to regression analysis. RESULTS: For three resin luting agents with dual-cured mode, FS, EM, KHN1, and KHN2 decreased with the increase of ceramic thickness. FS except for Nexus 2 and EM for three resin luting agents had a positive linear relationship with both KHN1 and KHN2. SIGNIFICANCE: The variables tested behaved differently. When the ceramic thickness increased, the chemical cured components of dual-cured resin luting agents did not produce significant compensation for all variables. Mechanical properties and polymer structure of dual-cured resin luting agents was dependent on the intensity of light irradiation.
キーワード: Ceramic / Thickness / Dual-cured resin luting agent / Flexural strength / Elastic modulus / Knoop hardness / Degree of conversion / Cross-linking density
URI: http://hdl.handle.net/10069/16666
ISSN: 01095641
DOI: doi:10.1016/j.dental.2007.06.014
PubMed ID: 17669482
権利: Copyright © 2007 Academy of Dental Materials Published by Elsevier Ltd.
資料タイプ: Journal Article
原稿種類: author
出現コレクション:130 学術雑誌論文

引用URI : http://hdl.handle.net/10069/16666

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