Anshu M Chandurkar1, Sandeep S Metgud2, Shaikh Shoeb Yakub3, Vaishali J Kalburge4, Basawaraj C Biradar5. 1. Assistant Professor, Department of Conservative Dentistry and Endodontics, Rural Dental College , Pravara Medical Trust, India . 2. Professor, Department of Conservative Dentistry and Endodontics, Pacific Dental College , Udaipur, Rajasthan, India . 3. Professor, Department of Conservative Dentistry and Endodontics, Rural Dental College , Pravara Medical Trust, India . 4. Assistant Professor, Department of Conservative Dentistry and Endodontics, Siddhpur Dental College and Research Centre , Siddhpur, India . 5. Reader, Department of Conservative Dentistry and Endodontics, Rural Dental College , Pravara Medical Trust, India .
Abstract
BACKGROUND: The purpose of this study was to evaluate the effects of light intensity and curing cycles of QTH and LED lights on the microleakage of Class V composite restorations. MATERIALS AND METHODS: Eighty freshly extracted human maxillary premolars were used for this study. Standardized Class V cavities were prepared and they were restored with microhybrid resin composite. According to the curing protocol, the teeth were then divided into 4 groups (n=20): QTH curing (standard and soft start modes), and LED (standard and soft start modes) irradiations. Microleakage was evaluated by immersion of the samples in 50% silver nitrate solution. The samples were then sectioned, evaluated under a stereomicroscope, and scored for microleakage. RESULTS: The results of the present in-vitro study showed mean dye leakage scores of 1.9, 1.2, 1.45 and 0.90 for Group I (QTH-Standard mode), Group II (QTH-Soft Start mode), Group III (LED-Standard mode) and Group IV (LED-Soft Start mode) respectively. CONCLUSION: It was thus concluded that the soft start polymerization showed a highly significant difference as compared to the standard curing modes of QTH and LED lights, respectively.
BACKGROUND: The purpose of this study was to evaluate the effects of light intensity and curing cycles of QTH and LED lights on the microleakage of Class V composite restorations. MATERIALS AND METHODS: Eighty freshly extracted human maxillary premolars were used for this study. Standardized Class V cavities were prepared and they were restored with microhybrid resin composite. According to the curing protocol, the teeth were then divided into 4 groups (n=20): QTH curing (standard and soft start modes), and LED (standard and soft start modes) irradiations. Microleakage was evaluated by immersion of the samples in 50% silver nitrate solution. The samples were then sectioned, evaluated under a stereomicroscope, and scored for microleakage. RESULTS: The results of the present in-vitro study showed mean dye leakage scores of 1.9, 1.2, 1.45 and 0.90 for Group I (QTH-Standard mode), Group II (QTH-Soft Start mode), Group III (LED-Standard mode) and Group IV (LED-Soft Start mode) respectively. CONCLUSION: It was thus concluded that the soft start polymerization showed a highly significant difference as compared to the standard curing modes of QTH and LED lights, respectively.
Authors: Daniela Francisca Gigo Cefaly; Giovano Augusto de Oliveira Ferrarezi; Celiane Mary Carneiro Tapety; José Roberto Pereira Lauris; Maria Fidela de Lima Navarro Journal: Braz Dent J Date: 2005