Shear bond strength of brackets bonded with hydrophilic and hydrophobic bond systems under contamination

Abstract

Objective: To compare, in vitro, the shear bond strength (SBS) of two bond systems: Transbond XT/XT primer (TXT/XT) and Transbond Plus Color Change/Transbond Self Etching Primer (TPCC/ TSEP). Materials and Methods: Each system was examined under four enamel surface conditions (dry, water, saliva, and blood), and 160 bovine teeth were divided into eight groups of 20 according to enamel surface condition. Group 1 used TPCC/TSEP and Group 2 used TXT/XT under dry conditions; Group 3 used TPCC/TSEP and Group 4 used TXT/XT with water; Group 5 used TPCC/ TSEP and Group 6 used TXT/XT under saliva; and Group 7 used TPCC/TSEP and Group 8 used TXT/XT with blood. Brackets were bonded, and the samples were thermocycled 500 times between 5uC and 55uC; they were then submitted to a shear bond test with a universal testing machine with a 50 kgf load cell at 5 mm/min. Results: Although water and saliva affected TXT/XT more than they affected TPCC/TSEP, there were no significant differences among the groups (Groups 3 and 4: P 5 .940; Groups 3 and 5 and Groups 4 and 6: P 5 1.000; Groups 3 and 6: P 5 .988; Groups 4 and 5: P 5 .690; and Groups 5 and 6: P 5 .861). Conclusions: The presence of blood resulted in the lowest SBS from both bond systems, but especially from TXT/XT. TPCC/TSEP resulted in a higher SBS than TXT/XT under all conditions except the dry enamel surface. (Angle Orthod. 2010;80:963-967.)

Shear bond strength comparison of moisture-insensitive primer and self-etching primer

“…They concluded that under contaminated condition, SEP and MIP primer should be used in conjunction with hydrophilic adhesive system rather than hydrophobic system. In another study, Santos et al .,[13] found that bond strength of SEP was not affected by contaminants such as water, saliva and blood when it was used in conjunction with a hydrophilic adhesive. Similar results have been seen in the present study.…”

Micro-shear bond strength of adhesive resins to enamel at different relative humidity conditions

“…Presence of humidity at the bonding area is one of the challenging situations in adhesive dentistry. Previous studies indicated that keeping saliva away from the bonding surface or to obtain a dry enamel surface by eliminating remnant water prior to adhesive application are crucial precautions to to take for long-term bond durability 2,3) . Several in vitro studies had investigated the bond strength between resin-enamel interfaces and concluded that by prevention of saliva on the enamel surface or similar water contamination, ideal dry enamel surfaces could be achieved [4][5][6] .…”

“…While considering the source of the humidity in oral environment, air that is exhaled through the mouth, had always been overlooked. The amount of water saturated in the exhaled air is reported to be about 27 mg/dm 3 and its possible effects on dental practice requires careful evaluation 9) . Although rubber dam can be used in routine in order to isolate the adhesive surface from the oral environment, its use could be restricted during luting laminate veneers and crowns with subgingival margins, operating in Class V lesions, bonding brackets in the posterior area or in many other chair-side conservative applications.…”

Shear Bond Strength of Orthodontic Brackets and Disinclusion Buttons: Effect of Water and Saliva Contamination

“…As blood [1, 4, 9, 13, 20], water [3, 6, 24], and saliva [3, 9, 24] contamination on shear bond strength of orthodontic brackets has been extensively tested, no studies are present about water and saliva contamination of disinclusion buttons. In the present investigation for both disinclusion buttons and orthodontic brackets, no significant differences were found between water- and saliva-contaminated groups.…”