Malik Sartaj
Senior Resident, Department of Conservative Dentistry and Endodontics.
Aalia Mukhtar
Senior Resident, Department of Conservative Dentistry and Endodontics.
Mushtaq Mohammad Bhat
Post Graduate scholar, Department of Conservative Dentistry and Endodontics.
Riyaz Farooq
Professor/Dean, Department of Conservative Dentistry and Endodontics.
Aamir Rashid
Associate Professor, Department of Conservative Dentistry and Endodontics.
Abstract
The clinical performance of composite resins is greatly influenced by the quality of the light-curing unit used. The aim of this study was to compare the efficiency of a newer short duration curing device with that of traditional long duration devices. The effectiveness of cure was investigated by checking compressive strength of two composites cured with standard regimens of two LED LCUs viz, Dentamerica LCU at 20 sec and Wood pecker iLed LCU at 2 sec. Two light cured resin based composites, nano-composite (Z350, 3M ESPE) and micro-hybrid composite (Z100, 3M ESPE), were formed into eighty disks of two dimensions 6-2 and 6-4 and cured by two LCUs at standard regimens. The compressive strength test was performed using a Universal Testing Machine at a crosshead speed of 1 mm/min. Data was subjected to the parametric statistical analysis (ANOVA, t test) at significant level of P = 0.05. Results of the present study showed that, some nanofilled composites may have higher compressive strength than the microhybrid composite resins. No significant differences were found between the compressive strengths of both the resin composites cured by two different units at different time regimens of 20 sec and 2 sec used in the study.
Keywords: composite, light curing, curing time,polymerization