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KMID : 0362320060310050352
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Journal of Korean Academy of Operative Dentistry
2006 Volume.31 No. 5 p.352 ~ p.358
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Influence of Thickness on the Degree of Cure of Composite Resin Core Material
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Kwon Pyoung-Cheol
Park Jeong-Won
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Abstract
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The purpose of this study was to investigate the influence of thickness on the degree of cure of dual-cured composite core. 2, 4, 6, 8 mm thickness Luxacore Dual and Luxacore Self (DMG Inc, Hamburg, Germany) core composites were cured by bulk or incremental filling with halogen curing unit or self-cure mode The specimens were stored at 37℃ for 24 hours and the Knoop’’s hardness of top and bottom surfaces were measured. The statistical analysis was performed using ANOVA and Tukey’’s test at p = 0.05 significance level. In self cure mode, polymerization is not affected by the thickness. In Luxacore dual, polymerization of the bottom surface was effective in 2, 4 and 6 (incremental) mm specimens. However the 6 (bulk) and 8 (bulk, incremental) mm filling groups showed lower bottom/top hardness ratio (p < 0.05). Within the limitation of this experiment, incremental filling is better than bulk filling in case of over 4 mm depth, and bulk filling should be avoided. [J Kor Acad Cons Dent 31 (5) :352-358, 2006]
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KEYWORD
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Dual cure resin core, Microhardness, Polymerization
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