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Effects of functional monomers and photo-initiators on the degree of conversion of a dental adhesive

Paper ID Volume ID Publish Year Pages File Format Full-Text
1084 74 2012 7 PDF Available
Title
Effects of functional monomers and photo-initiators on the degree of conversion of a dental adhesive
Abstract

Besides functional and cross-linking monomers, dental adhesives contain a photo-initiator system for polymerization, thereby providing physico-mechanical strength to the adhesive–tooth interface. Few studies have investigated the effect of the functional monomer and polymerization–initiation system on the polymerization efficiency of the adhesive. Here, we tested the effect of two different functional monomers (MAC-10 vs. SR) and two photo-initiator systems, camphorquinone-amine (CQ) vs. borate (BO), on the degree of conversion (DC) of different adhesive formulations. The DC of the CQ-cured adhesive formulations was significantly affected by the MAC-10 monomer. This should be ascribed to the known inactivation of the amine co-initiator through acid–base reaction. However, the SR monomer did not decrease the DC, which could be attributed to a “gel effect” or the so-called “Trommsdorff–Norrish” phenomenon of enhanced DC with more viscous resins, and to the more favorable availability of CC double bonds. In contrast, the DC of the BO-cured adhesive formulations was not affected by any acidic monomer. It is concluded that the degree of conversion of an adhesive can be affected by the functional monomer, but this depends on the kind of photo-initiator system used. As bond durability depends, among other factors, on the strength and thus degree of conversion of the adhesive, potential interaction between adhesive ingredients and the photo-initiator system definitely needs to be studied further.

Graphical abstractStructure of the two functional monomers MAC-10 and SR and, respectively, a relatively low (high amount of residual CC) and high (low amount of residual CC) conversion degree with CQ as photo-initiator.Figure optionsDownload full-size imageDownload high-quality image (117 K)Download as PowerPoint slide

Keywords
Dental; Adhesive; Functional monomer; Photo-initiator; Polymerization conversion
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Effects of functional monomers and photo-initiators on the degree of conversion of a dental adhesive
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 8, Issue 5, May 2012, Pages 1928–1934
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us