Effects of immediate and delayed light activation on the polymerization shrinkage-strain of dual-cure resin cements.
10.4047/jkap.2014.52.3.195
- Author:
So Yeoun LEE
1
;
Sung Hun KIM
;
Seung Ryong HA
;
Yu Sung CHOI
;
Hee Kyung KIM
Author Information
1. School of Dentistry, Seoul National University, Seoul, Republic of Korea.
- Publication Type:Original Article
- Keywords:
Dual-cure resin cement;
Polymerization shrinkage-strain;
Light activation
- MeSH:
Polymerization*;
Polymers*;
Resin Cements*
- From:The Journal of Korean Academy of Prosthodontics
2014;52(3):195-201
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
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 37degrees C. Five recordings of each material with three different modes were taken. Data were analyzed using one-way ANOVA and multiple comparison Scheffe'test (alpha=.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.
