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J Appl Oral Sci. 2013 Mar-Apr;21(2):190-5. doi: 10.1590/1678-7757201302380.

Post-curing conversion kinetics as functions of the irradiation time and increment thickness.

Author information

1
Department of Surgical Sciences, Dental School Lingotto, University of Turin, Turin, Italy. nicola.scotti@unito.it

Abstract

OBJECTIVE:

This study evaluated the variation of conversion degree (DC) in the 12 hours following initial photoactivation of a low-shrinkage composite resin (Venus Diamond).

MATERIAL AND METHODS:

The conversion degree was monitored for 12 hours using Attenuated Total Reflection (ATR) F-TIR Spectroscopy. The composite was placed in 1 or 2 mm rings and cured for 10 or 20 seconds with a LED lamp. ATR spectra were acquired from the bottom surface of each sample immediately after the initial photoactivation (P=0), 30 minutes (P=0.5) and 12 hours after photoactivation (P=12) in order to obtain the DC progression during the post-curing period. Interactions between thickness (T), irradiation time (I) and post-curing (P) on the DC were calculated through ANOVA testing.

RESULTS:

All the first order interactions were statistically significant, with the exception of the T-P interaction. Furthermore, the shift from P=0 to P=0.5 had a statistically higher influence than the shift from P=0.5 to P=12. The post-curing period played a fundamental role in reaching higher DC values with the low-shrinkage composite resin tested in this study. Moreover, both the irradiation time and the composite thickness strongly influenced the DC.

CONCLUSIONS:

Increased irradiation time may be useful in obtaining a high conversion degree (DC) with a low-shrinkage nano-hybrid composite resin, particularly with 2 mm composite layers.

PMID:
23739861
PMCID:
PMC3881873
DOI:
10.1590/1678-7757201302380
[Indexed for MEDLINE]
Free PMC Article
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