Comparative Evaluation of the Effects of Light Intensities and Curing Cycles of QTH, and LED Lights on Microleakage of Class V Composite Restorations.
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.


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.


CONCLUSIONS
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.
Assistant Professor, Department of Conservative Dentistry and Endodontics, Rural Dental College , Pravara Medical Trust, India .
Anshu M
AM
Chandurkar
Professor, Department of Conservative Dentistry and Endodontics, Pacific Dental College , Udaipur, Rajasthan, India .
Sandeep S
SS
Metgud
Professor, Department of Conservative Dentistry and Endodontics, Rural Dental College , Pravara Medical Trust, India .
Shaikh Shoeb
SS
Yakub
Assistant Professor, Department of Conservative Dentistry and Endodontics, Siddhpur Dental College and Research Centre , Siddhpur, India .
Vaishali J
VJ
Kalburge
Reader, Department of Conservative Dentistry and Endodontics, Rural Dental College , Pravara Medical Trust, India .
Basawaraj C
BC
Biradar
Composite resin; Dental leakage; Halogen light curing; LED light curing; Marginal adaptation