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Related Experiment Videos

Post-gel shrinkage with pulse activation and soft-start polymerization.

A U J Yap1, M S Soh, K S Siow

  • 1Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore.

Operative Dentistry
|February 2, 2002
PubMed
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Effectiveness of composite cure associated with different light-curing regimes.

Operative dentistry·2005

Pulse activation and soft-start polymerization regimens did not significantly alter post-gel shrinkage compared to the control. Pulse Delay I (PDI) showed the lowest shrinkage immediately after light polymerization.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Polymerization shrinkage in dental composites can lead to marginal gaps and secondary caries.
  • Optimizing light-curing protocols is crucial for minimizing stress and improving restoration longevity.

Purpose of the Study:

  • To evaluate the effect of pulse activation and soft-start polymerization on the post-gel shrinkage of a visible light-activated composite resin (Z100).
  • To compare various light-curing modes, including control, pulse delay, and soft-start, on polymerization shrinkage.

Main Methods:

  • Six light-curing modes were tested: Control (C), Pulse Delay I (PDI), Pulse Delay II (PDII), Soft-start (SS), Pulse Cure I (PCI), and Pulse Cure II (PCII).
  • A strain-monitoring device measured linear polymerization shrinkage up to 60 minutes post-cure.
  • Data analysis involved one-way ANOVA and Scheffe's post-hoc test at a 0.05 significance level.

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Main Results:

  • Pulse Delay I (PDI) exhibited significantly lower post-gel shrinkage immediately after light polymerization compared to PDII, SS, and PCI.
  • At one minute, PDI showed significantly less shrinkage than PDII and SS.
  • Significant differences between PDI and SS were noted at 10, 30, and 60 minutes.

Conclusions:

  • No significant difference in post-gel shrinkage was observed between the control group and all tested pulse activation/soft-start polymerization regimens at all time intervals.
  • While PDI demonstrated lower immediate shrinkage, overall, the tested advanced curing modes did not consistently outperform the control in reducing long-term polymerization shrinkage.