Degree of Conversion of Metacrylate- and Silorane-based Dental Composites at Various Depths and Using Different Matrix Bands

Barekatain, Mehrdad and Mousavinasab, Seyed Mostafa and Azarbaijani, Saeid and Ranjbaran, Fateme Sadat and Zadeh Dadashi, Masoud (2018) Degree of Conversion of Metacrylate- and Silorane-based Dental Composites at Various Depths and Using Different Matrix Bands. Journal of Mashhad Dental School, 42 (2). pp. 133-140.

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Abstract

Introduction:To improve the quality of tooth-colored restorations, various equipment and materials are being used. In this study, we sought to determine the degree of conversion of metacrylate- and silorane-based composites using transparent blue matrix strip at different depths. Materials and Methods: In this experimental-laboratory study, 48 specimens of methacrylate- and silylane-based composites were prepared in pre-made molds in thicknesses of 1, 2 and 3 mm. half of the specimens were cured with transparent polyester strips and the other half with blue strips, and then they were hardened by using a light-curing unit. The degree of conversion was determined by FT-IR. The degree of polymerization was assessed by comparing the IR absorption spectra between monomer and polymer specimens. The data were analyzed by performing Mann-Whitney and Kruskal-Wallis tests in SPSS. Results: The highest degree of conversion pertained to P90 composite with using transparent strip in 1 mm thickness (45.5±1.29), while the lowest degree belonged to Z350 composite with using transparent strip in 3 mm thickness (14.7±1.70). In comparison of the four groups, the silorane-based group with blue strip (41) had the highest conversion degree, followed by the same composite (silorane) with transparent strip (39.6). Conversion degrees in these types of materials were much greater than those in metacrylate-based types (21). Conclusion: In deep restorations with limited access to a light source, the use of silorane-based composites and blue polyester strips enhances the degree of conversion.

Item Type: Article
Subjects: WU Dentistry. Oral surgery
Divisions: Journals > Journal of Mashhad Dental School
Depositing User: jmds jmds
Date Deposited: 14 Jun 2018 06:44
Last Modified: 14 Jun 2018 06:44
URI: http://eprints.mums.ac.ir/id/eprint/9797

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