fa 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 ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <p> <strong>Objectives</strong></p><p>  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. <strong></strong></p><p> <strong>Methods</strong></p><p>  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. </p><p> <strong>Results</strong></p><p>  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. </p><p> <strong>Conclusions</strong> </p><p> 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.</p><p> <strong> Clinical significance</strong> </p><p> The photo-initiator TPO may be used in self-etch adhesives instead of CQ/Amine with similar curing and ‘immediate’ bonding efficiency. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p> <a href="http://www.jodjournal.com/article/S0300-5712(13)00180-2/abstract" target="_blank"><font color="#0000ff">Full Text</font></a></p> Adhesive, Degree of conversion, Bond strength, Dentine, TPO, FTIR 0 0 http://idai.ir/browse.php?a_code=A-10-32-2207&slc_lang=fa&sid=1 Vesna Miletic 100319475328460010392 100319475328460010392 Yes KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven), Belgium Pong Pongprueksa 100319475328460010393 100319475328460010393 No KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven), Belgium Jan De Munck 100319475328460010394 100319475328460010394 No KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven), Belgium Neil R. Brooks 100319475328460010395 100319475328460010395 No Department of Chemistry, KU Leuven (University of Leuven), Belgium Bart Van Meerbeek 100319475328460010396 100319475328460010396 No KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven), Belgium