Abstract
Background: Setting of conventional glass ionomers cement and dental resin composites as filling materials
is predominantly through polymerization reaction, which is usually induced by light. The objective of this
study was to assess the temperature changes, light intensities, sorption and solubility capability and
comparative micro hardness in Dental Resin Composites (DRC) by using two different light curing units that
is Quartz Tungsten Halogen (QTH) and Light Emitting Diodes (LED).
Methods: This analytical, experimental, in-vitro study was spanned over one month, conducted in the
laboratory of Dental Materials, Dr. Ishrat-ul-Ibad Khan Institute of Oral Health Sciences. Through
non-probability, convenient sampling, 60 samples of DRCs was prepared as 10mm in diameter and 2mm in
thickness in the steel moulds by a single trained operator. Effect of heat generation, light intensities, sorption
and solubility and micro hardness during polymerization of DRCs were all measured. Statistical analysis was
done using SPSS with descriptive statistics and two sample independent t-tests. The p-value of <0.05 was
considered significant at 95 % confidence level.
Results: Mean surface micro hardness of DRC was found to be 15.48±0.46 and 18.26±0.53 when QTH and LED
lamps were employed respectively. Whereas, mean light intensity of QTH and LED lamps were found to be
434 and 925mW/cm2
. No significant difference in temperature change during polymerization reaction
(p=0.128) and in sorption and solubility capability (p=0.001) of DRC was observed.
Conclusion: Light-emitting diodes were evaluated to be more effective than Quartz Tungsten Halogen Light
in achieving increased surface micro hardness of DRC.
Afreen Bilgrami, Fazal-ur-Rehman Qazi, Malik Saleem Shaukat, Aeeza Malik, Talha Nayab, Wasif Iqbal. (2020) Comparative Effectiveness of Two Light Curing Units on the Properties of Dental Resin Composites, The Pakistan Journal of Medicine and Dentistry, Volume 9, Issue 4.
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