THE EFFECT OF CURING TIME AND VOLTAGE ON THE DEPTH OF CURE%OF DIFFERENT SHADES OF VISIBLE LIGHT CURE COMPOSITE RESIN, AN EXPERIMENTAL STUDY.
DOI:
https://doi.org/10.33279/jkcd.v9i01.338Abstract
Objective:
To determine the effect of Curing Time and Voltage on 'depth of cure' of different shades of (Z -100) anterior
composite restorative material.
Materials and Methods:
An Experimental Study was conducted in the Operative Dentistry Clinic at Sardar Begum Dental Hospital, Gandhara University during the months of March and April 2018.Sample size was 90 (45 in each group) by using the calculated using a WHO calculator for health studies using the formula for hypothesis test for two population means (one-sided).Consecutive sampling technique was used to collect data. The shades (A1, A2, A3, A3.5, A4 and B1) of Z-100 dental composite system (3M ESPE, USA) will be included in the study. All shades other then these are excluded from the study. Each shade was exposed to different curing times (20s, 30s, and 40s) and variable voltage (180V, 220V). ISO scraping test was used to establish “depth of cure” for various shades. SPSS ver 17 was used for analysis
Results:
The sample size was 90 (45 in each group). The minimum curing time was 1.86, and the maximum was 3.43 seconds with a mean and standard deviation of 2.72 and 0.43 seconds respectively. All the shades (A1, A2, A3, and A3.5 & A4) in this study passed the ISO requirement of achieving 1.5 mean depth of cure under in vitro conditions. A statistically significant difference was noticed between the mean depth of cure of various shades of composite materials at 20, 40 and 80 seconds of curing time (p-value <0.001). There was a statistically significant difference between the mean depth of cure of various shades of composite materials at 180 and 220 volts of current (p-value 0.003). There was no statistical difference between the mean curing depths of various shades of Z-100 composite materials (P-value 0.993).
Conclusion:
This study showed that curing of different shades of composite material at different curing period and voltages significantly affect the curing depth. Change in voltage and time affects the curing depth significantly. It's
important to use voltage regulator in operatory clinics where the voltage is not constant to achieve accurate curing
intensity from the curing light. Once a baseline value is recognized, this technique can be used by the dentist to verify
the depth of cure from time to time and to verify the work/ quality of the resin-based composite and light curing kit.
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Copyright (c) 2019 Ruqayya Sana, Pashmina Nisar, Shakeel Ur Rehman
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