The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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olymerization behavior and thermal characteristics of two new composites at five temperatures: refrigeration to preheating

  • Jafarzadeh-Kashi, Tahereh Sadat (Department of Dental Materials, Faculty of Dentistry, Tehran University of Medical Sciences, Research Center for Medical and Technology in Medical Sciences, Tehran University of Medical Sciences) ;
  • Mirzaii, Marzieh (Department of Pharmaceutics, Pharmacy School, Shahid Beheshti University of Medical Sciences) ;
  • Erfan, Mohmmad (Department of Pharmaceutics, Pharmacy School, Shahid Beheshti University of Medical Sciences) ;
  • Fazel, Akbar (Department of Prosthodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Secretary of the Dentistry and Specialties, Deputy of Education, Ministry of Health and Medical Education) ;
  • Eskandarion, Solmaz (Department of Dental Materials, Faculty of Dentistry, Tehran University of Medical Sciences) ;
  • Rakhshan, Vahid (Department of Dental Anatomy and Morphology, Dental Branch, Islamic Azad University)
  • Received : 2011.10.20
  • Accepted : 2011.11.24
  • Published : 2011.12.30
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Abstract

PURPOSE. Heat of composite polymerization (HP) indicates setting efficacy and temperature increase of composite in clinical procedures. The purpose of this in vitro experimental study was to evaluate the effects of 5 temperatures on HP of two new composites. MATERIALS AND METHODS. From each material (Core Max II [CM] and King Dental [KD]), 5 groups of 5 specimens each were prepared and their total HPs (J/gr) were measured and recorded, at one of the constant temperatures $0^{\circ}C$, $15^{\circ}C$, $23^{\circ}C$, $37^{\circ}C$ and $60^{\circ}C$ ($2{\times}5{\times}5$ specimens) using a differential scanning calorimetry (DSC) analyzer. The data were analyzed using a two-way ANOVA, a Tukey's test, an independent-samples ttest, and a linear regression analysis (${\alpha}=0.05$). RESULTS. No polymerization reactions occurred at $0^{\circ}C$; then this temperature was excluded from statistical analyses. The mean HP of the remaining 20 KD specimens was $20.5{\pm}14.9$ J/gr, while it was $40.7{\pm}12.9$ J/gr for CM. The independent-samples t-test showed that there were significant differences between the HP of the two materials at the temperatures $15^{\circ}C$ (P=.0001), $23^{\circ}C$ (P=.0163), $37^{\circ}C$ (P=.0039), and $60^{\circ}C$ (P=.0106). Linear regression analysis showed statistically significant correlations between environment temperatures and HP of CM ($R^2=0.777$). CONCLUSION. Using CM is advantageous over conventional composite because of its better polymerization capacity. However due to its high HP, further studies should assess its temperature increase in vivo. Preheating KD is recommended. Refrigerating composites can negatively affect their polymerization potential.

Keywords

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