Tahereh Sadat Jafarzadeh-Kashi1, Mohmmad Erfan2, Salmeh Kalbasi3, Malihe Ghadiri4, Vahid Rakhshan5. 1. Iranian Tissue Bank & Research Center, Tehran University of Medical Sciences, Tehran, Iran ; Department of Dental Materials, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran ; Research Center for Medical and Technology in Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran. 2. Department of Pharmaceutics, Pharmacy School, Shahid Beheshti University of Medical Sciences, Tehran, Iran. 3. Orthodontist in Private Practice, Tehran, Iran. 4. Pharmacist in Private Practice, Tehran, Iran. 5. Iranian Tissue Bank & Research Center, Tehran University of Medical Sciences, Tehran, Iran ; Department of Dental Anatomy and Morphology, Dental Branch, Islamic Azad University, Tehran, Iran.
Abstract
BACKGROUND AND PURPOSE: Polymerization 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. METHODS: Forty 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). RESULTS: There 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. CONCLUSIONS: The two light-curing units had similar effects on the EP. The EP values were better when curing was performed at human body temperature.
BACKGROUND AND PURPOSE: Polymerization 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. METHODS: Forty 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). RESULTS: There 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. CONCLUSIONS: The two light-curing units had similar effects on the EP. The EP values were better when curing was performed at human body temperature.
Entities:
Keywords:
Bonding agent; Dental materials; Differential scanning calorimetry; Extent of polymerization; Light-curing of dental adhesives; Light-curing units; Polymerization; Temperature