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Comparative evaluation of the degree of conversion of four different composites polymerized using ultrafast
Sundaresan Balagopal1, Nagarajan Geethapriya1, Sebatni Anisha1
1Department of Conservative Dentistry and Endodontics, Tagore Dental College and Hospital, Chennai, India.
Context:
Lower degree of conversion (DC%) of monomer to polymer in a resin composite restoration could be a health hazard for the patient as well as it could affect the longevity of the restoration.
Aims:
This study is aimed to compare and evaluate the DC% of four different composites polymerized using ultrafast photopolymerization.
Settings And Design:
In-vitro study.
Materials And Methods:
A total of 40 disc-shaped composite samples were used in the study. Twenty samples were prepared for each group using 2 mm height and 6 mm diameter Tygon tube as a matrix. All of the composites were cured using the Woodpecker i Led light-curing unit with an intensity of 2300-2500 mW/cm2 (TURBO mode). Samples in Group 1 were cured for 1 s and samples in Group 2 were cured for 3 s. Each group had 4 subgroups of five samples of the 4 resin composites tested. After photo-activation, the specimens were stored under dark dry conditions at room temperature for 24 h before testing. The DC% was measured using Fourier-transform infrared spectroscopy.
Statistical Analysis Used:
The DC% were analyzed using ANOVA, and Tukey HSD post hoc test using IBM SPSS 21 software.
Results:
Among the experimental groups, Group 2 showed a higher DC% which ranges from 93.7% to 95.4% than Group 1 which ranges from 58.5% to 65.5%. There was a statistically significant difference in the DC% among the materials tested (P < 0.05).
Conclusions:
Within the limitations of the study, it was concluded that composites cured for 3 s showed a higher DC% which ranges from 93.7% to 95.4% than those cured for 1 s. The DC% also varied among the four different composites tested.
