| Autor: |
Mukherjee, Sayantan, Mazumdar, Paromita, Desai, Priti D., Maity, Ipsita, Chatterjee, Rajshekhar, Ghosh, Sayanti, Maiti, Moupriya Bera, Basu, Pratayee |
| Předmět: |
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| Zdroj: |
Journal of Clinical & Diagnostic Research; 2024 Supplement, Vol. 18, p28-28, 3/4p |
| Abstrakt: |
Introduction: Polymerization shrinkage, the inherent disadvantage of visible light-activated composite resin can be minimized by pregel polymerization at low intensity followed by final cure at high intensity. Aim: To determine the degree of conversion and effectiveness of composite cure associated with standard mode and soft start polymerization by Fourier transformation infrared spectroscopy (F.T.I.R) and microhardness testing. Materials and Methods: Uncured composite resin samples were subjected to F.T.I.R and an absorbance peak was obtained. A total of 12 composite resin samples were prepared by placing them into plastic moulds (2 mm×4 mm) and divided into two groups six samples in each. Group I and II samples were light cured for 40 sec with standard mode and soft start mode respectively. Samples after curing pulverized into powder and then kBr disc were prepared with resin powder with 70 mg infrared grade. Then absorbance peak was obtained, and the degree of conversion was determined. For microhardness testing 12 composite resin sample moulds were prepared and divided into two groups. These two groups were light cured for 40 sec in soft start mode and standard mode respectively and then vicker microhardness testing was obtained. Data obtained was analysed using Student's t-test. Results: The degree of conversion of group II cured by standard mode was significantly greater and Vicker hardness number of group II was higher than the group I. Conclusion: Significant difference in microhardness and degree of conversion was seen between standard mode of curing and soft start polymerization. The reduced rate of conversion by soft start polymerization also affects the micromechanical properties of cured composite. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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