The effects of light curing units and environmental temperatures on CC conversion of commercial and experimental bonding agents |
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| Authors: | Tahereh Sadat Jafarzadeh-Kashi Mohmmad Erfan Salmeh Kalbasi Malihe Ghadiri Vahid Rakhshan |
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| Affiliation: | 1. Iranian Tissue Bank & Research Center, Tehran University of Medical Sciences, Tehran, Iran;2. Department of Dental Materials, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran;3. Research Center for Medical and Technology in Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran;4. Department of Pharmaceutics, Pharmacy School, Shahid Beheshti University of Medical Sciences, Tehran, Iran;5. Orthodontist in Private Practice, Tehran, Iran;6. Pharmacist in Private Practice, Tehran, Iran;7. Department of Dental Anatomy and Morphology, Dental Branch, Islamic Azad University, Tehran, Iran |
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| Abstract: | Background and purposePolymerization of bonding agents (BA) is a critical factor in determining the success of bonded restorations. We aimed to assess the effects of two light curing units and two temperatures on the extent of polymerization (EP) of a commercial BA and an experimental BA.MethodsForty BA specimens were randomly divided into 8 subgroups of n = 5 to compare the polymerization of two BAs (experimental/Scotchbond) based on the variables: temperature (23/37 °C) and light-curing unit (quartz-tungsten-halogen/light-emitting diode). The EP (%) was measured using differential scanning calorimetry, and analyzed using the t-test, two- and three-way analyses of variance (ANOVA), and the Bonferroni test (α = 0.05).ResultsThere were significant differences between the EP results between the two BAs (P = 0.012) and due to the different temperatures (P = 0.001), but not between the different light-curing units (P = 0.548). The interaction between BA and temperature was significant (P < 0.001). The other interactions were nonsignificant.ConclusionsThe two light-curing units had similar effects on the EP. The EP values were better when curing was performed at human body temperature. |
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| Keywords: | Extent of polymerization Bonding agent Light-curing units Temperature Dental materials Differential scanning calorimetry Light-curing of dental adhesives Polymerization |
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