1. Monomer-to-polymer conversion and micro-tensile bond strength to dentine of experimental and commercial adhesives containing diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide or a camphorquinone/amine photo-initiator system.
- Author
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Miletic V, Pongprueksa P, De Munck J, Brooks NR, and Van Meerbeek B
- Subjects
- Acid Etching, Dental methods, Adult, Bisphenol A-Glycidyl Methacrylate chemistry, Camphor chemistry, Curing Lights, Dental classification, Humans, Light-Curing of Dental Adhesives instrumentation, Materials Testing, Methacrylates chemistry, Organophosphorus Compounds chemistry, Polyethylene Glycols chemistry, Polymerization, Polymethacrylic Acids chemistry, Resin Cements chemistry, Spectroscopy, Fourier Transform Infrared, Stress, Mechanical, Tensile Strength, Time Factors, Water chemistry, Young Adult, para-Aminobenzoates chemistry, Camphor analogs & derivatives, Dental Bonding, Dentin ultrastructure, Dentin-Bonding Agents chemistry, Phosphines chemistry, Photoinitiators, Dental chemistry
- Abstract
Objectives: To compare the degree of conversion (DC) of adhesives initiated by diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) or a camphorquinone/tertiary amine system (CQ/Amine) as well as their 'immediate' micro-tensile bond strength (μTBS) to bur-cut dentine., Methods: DC of Scotchbond Universal ('SBU'; 3M ESPE), its experimental counterpart containing TPO as photo-initiator system, an experimental G-aenial Bond ('Ga-B'; GC) adhesive formulation, and an experimental LUB-102 adhesive formulation ('LUB', Kuraray Noritake), containing as photo-initiatior system either 2wt% CQ along with 2wt% tertiary amine ('SBU_CQ/Amine'; 'Ga-B_CQ/Amine'; 'LUB_CQ/Amine'), or 2wt% TPO ('SBU_TPO'; 'Ga-B_TPO'; 'LUB_TPO'), was determined using Fourier-transform infrared spectroscopy (FTIR), after being cured with a dual-wavelength light-curing unit (bluephase 20i, Ivoclar Vivadent). The same adhesive formulations were applied to bur-cut mid-coronal dentine of intact human molars, and subjected to a μTBS test after 1-week water storage. Besides being applied following a self-etch (SE) application mode, the adhesive formulations SBU_CQ/Amine and SBU_TPO were also applied following an etch-and-rinse (E&R) mode, this both for DS and μTBS measurement., Results: No significant difference in DC was found for any of the adhesive formulations, except for SBU_CQ/Amine_SE and SBU_TPO_SE. For both SBU formulations, a significantly higher DC was reached for the E&R than the SE approach. Regarding μTBS, no significant differences were recorded, except for the significantly higher μTBS measured for SBU_CQ/Amine_E&R and SBU_TPO_E&R., Conclusions: In self-etch adhesives, the photo-initiator TPO may be used instead of CQ/Amine. The curing and 'immediate' bonding efficiency depended on the application protocol (E&R versus SE), but not on the photo-initiator system., Clinical Significance: The photo-initiator TPO may be used in self-etch adhesives instead of CQ/Amine with similar curing and 'immediate' bonding efficiency., (Copyright © 2013 Elsevier Ltd. All rights reserved.)
- Published
- 2013
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