J Korean Acad Prosthodont.  2014 Jul;52(3):195-201. 10.4047/jkap.2014.52.3.195.

Effects of immediate and delayed light activation on the polymerization shrinkage-strain of dual-cure resin cements

Affiliations
  • 1School of Dentistry, Seoul National University, Seoul, Republic of Korea.
  • 2Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea. ksh1250@snu.ac.kr
  • 3Department of Dentistry, School of Medicine, Ajou University, Suwon, Republic of Korea.
  • 4Department of Prosthodontics, Dankook University Dental Clinic, Cheonan, Republic of Korea.
  • 5Department of Prosthodontics, Veterans Health Service Medical Center Seoul, Republic of Korea.

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.

Keyword

Dual-cure resin cement; Polymerization shrinkage-strain; Light activation

MeSH Terms

Polymerization*
Polymers*
Resin Cements*
Polymers
Resin Cements
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