Dentin pretreatment and adhesive temperature as affecting factors on bond strength of a universal adhesive system

Abstract

Objectives:To evaluate the effects of dentin pretreatment and temperature on the bond strength of a universal adhesive system to dentin.Material and Methods:Ninety-six extracted non-carious human third molars were randomly divided into 12 groups (n=8) according to Scotchbond Universal Adhesive (SbU) applied in self-etch (SE) and etch-and-rinse (ER) mode, adhesive temperature (20°C or 37°C) and sodium bicarbonate or aluminum oxide air abrasion. After composite build up, bonded sticks with cross-sectional area of 1 mm2 were obtained to evaluate the microtensile bond strength (μTBS). The specimens were tested at a crosshead speed of 0.5 mm/min on a testing machine until failure. Fractured specimens were analyzed under stereomicroscope to determine the failure patterns in adhesive, cohesive (dentin or resin) and mixed fractures. The microtensile bond strength data was analyzed using two-way ANOVA and Tukey's test (α=5%).Results:Interaction between treatment and temperature was statistically significant for SbU applied in self-etch technique. Both dentin treatments showed higher bond strength for ER mode, regardless of adhesive temperature. When compared to control group, sodium bicarbonate increased bond strength of SbU in SE technique. Adhesive temperature did not significantly affect the μTBS of tested groups. Predominantly, adhesive failure was observed for all groups.Conclusions:Dentin surface treatment with sodium bicarbonate air abrasion improves bond strength of SbU, irrespective of adhesive application mode, which makes this approach an alternative to increase adhesive performance of Scotchbond Universal Adhesive to dentin.

Effect of Diode Laser (810 nm) Irradiation on Marginal Microleakage of Multi-mode Adhesive Resins in Class V Composite Restorations

“…37,45,46 Also, there will be an increase in ionic reactions and functional monomer infiltration into dentin structure and collagen networks, thus resulting in more adhesive-tooth structure interactions and adhesion procedure. 35,36,47 Although laser radiation may increase bond strength and decrease marginal microleakage, the temperature changes were also measured in the present study due to the concerns about thermal necrosis of the pulp. It is reported that a 5.5°C increase in pulpal temperature causes a 15% chance of pulpal necrosis.…”

Comparison of bond strength of universal adhesives using different etching modes: A systematic review and meta-analysis

“…Fifteen only studied dentin's immediate micro-tensile strength 20,[51][52][53][54][55][56][57][58][59][60][61][62][63][64] , and 2 did not obtain detailed dentin micro-tensile strength values 65,66) . Finally, 15 in vitro studies were included and analyzed [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] .…”

Bond Strength of Universal Adhesives to Dentin: A Systematic Review and Meta-Analysis

“…The qualitative synthesis of the studies included in this systematic review are summarized in Table 2 . Several strategies were identified: Air abrasion [ 58 , 59 ], application of crosslinking agents [ 57 , 60 , 61 , 62 , 63 , 64 , 65 ], application of dentin desensitizers [ 66 , 67 ], use of matrix metalloproteinases (MMP) inhibitors [ 10 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 ], the use of the ethanol-wet bonding technique [ 78 ], application of an extra hydrophobic resin layer [ 56 , 79 , 80 , 81 , 82 , 83 , 84 , 85 ], dentin pretreatment with laser [ 55 , 86 , 87 , 88 , 89 , 90 , 91 , 92 ], multiple layer application [ 93 , 94 , 95 , 96 , 97 , 98 , 99 ], non-atmospheric plasma [ 100 , 101 ], prolonged curing time [ 102 ,…”