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KMID : 0362420140520030195
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Journal of Korean Academy of Prosthodontics
2014 Volume.52 No. 3 p.195 ~ p.201
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Effects of immediate and delayed light activation on the polymerization shrinkage-strain of dual-cure resin cements
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Lee So-Yeoun
Kim Sung-Hun
Ha Seung-Ryong
Choi Yu-Sung
Kim Hee-Kyung
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Abstract
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PURPOSE. This study was designed to compare the amount of polymerization shrinkage of dual-cure resin cements according to different polymerization modes and to determine the effect of light activation on the degree of polymerization.
MATERIALS AND METHODS. Four kinds of dual-cure resin cements were investigated: Smartcem 2, Panavia F 2.0, Clearfil SA Luting and Zirconite. Each material was tested in three different polymerization modes: self-polymerization only, immediate light polymerization and 5 minutes-delayed light polymerization. The time-dependent polymerization shrinkage-strain was evaluated for 30 minutes by Bonded-disk method at 37 degree C. Five recordings of each material with three different modes were taken. Data were analyzed using one-way ANOVA and multiple comparison Scheffe’test (a=.05).
RESULTS. All materials, except Panavia F 2.0, exhibited the highest polymerization shrinkage-strain through delayed light-activated polymerization. No significant difference between light activation modes was found with Panavia F 2.0. All materials exhibited more than 90% of polymerization rate in the immediate or delayed light activated group within 10 minutes.
CONCLUSION. As a clinical implication of this study, the application of delayed light activation mode to dual-cure resin cements is advantageous in terms of degree of polymerization.
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KEYWORD
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Dual-cure resin cement, Polymerization shrinkage-strain, Light activation
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