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Polymers 2016, 8(7), 250; doi:10.3390/polym8070250

Comparison of the Physical and Mechanical Properties of Resin Matrix with Two Photoinitiator Systems in Dental Adhesives

1
Department & Research Institute of Dental Biomaterials & Bioengineering, College of Dentistry, Yonsei University, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
2
Bisco, Inc., 1100 W, Irving Park Road, Schaumburg, IL 60193, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Pizzi
Received: 11 May 2016 / Revised: 13 June 2016 / Accepted: 27 June 2016 / Published: 1 July 2016
(This article belongs to the Special Issue Renewable Polymeric Adhesives)
View Full-Text   |   Download PDF [3173 KB, uploaded 1 July 2016]   |  

Abstract

This study evaluated the physical and mechanical properties of resin matrices in dental adhesives with two photoinitiator systems. Resin matrix specimens were made with five different kinds of photoinitiators. Neat resin consisted of 60% 2,2-bis[4-2(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (Bis-GMA) and 40% hydroxyethyl methacrylate (HEMA) by weight, along with camphorquinone (CQ, 1 mol %) and additional components (1 mol % each) as follows: Group 1, 2-(dimethylamino)ethyl methacrylate (DMAEMA); Group 2, ethyl-4-(dimethylamino) benzoate (EDMAB); Group 3, diphenyliodonium hexafluorphosphate (DPIHFP); Group 4, DMAEMA+DPIHFP; Group 5, EDMAB+DPIHFP. The degree of conversion (DC), flexural strength, flexural modulus, microhardness, and ultimate tensile strength were tested. The contribution of each photoinitiator to the DC in a selected group was analyzed with contour plots. One-way ANOVA and Tukey tests (p < 0.05) were used for statistical analyses. The DC of Groups 2, 4, and 5 was similar. The flexural strength was similar in all groups, but flexural modulus was significantly different. Group 3 had the lowest values for all physical and mechanical properties. Among all methods, the microhardness test revealed the greatest degree of difference among the five specimens. CQ, EDMAB, and DPIHFP were the most effective photoinitiators and CQ was the most influential factor for the DC rate. View Full-Text
Keywords: dental adhesives; degree of conversion; iodonium salts; microtensile strength; dynamic microhardness; ternary photoinitiator system dental adhesives; degree of conversion; iodonium salts; microtensile strength; dynamic microhardness; ternary photoinitiator system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kim, M.; Suh, B.-I.; Shin, D.; Kim, K.-M. Comparison of the Physical and Mechanical Properties of Resin Matrix with Two Photoinitiator Systems in Dental Adhesives. Polymers 2016, 8, 250.

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