Comparative Evaluation of shear Bond Strength of universal Dental Adhesives -An in vitro study

Abstract

BackgroundPatient demand for tooth colored restorations and desire for minimally invasive restorations have made composites an indispensable part of the restorative process. An important factor affecting the intra-oral performance of composite restorations is bonding.Material and MethodsNinty six freshly extracted molar teeth were collected and occlusal 3mm is removed using a diamond disc to expose dentine. Following with samples were divided in to two main groups (self-etch & total etch). Each main group is again sub divided in to three groups each according to bonding agent used (Tetric N- Bond Universal, Single Bond Universal, Tetric N Bond Total etch in total etch group and Clear Fill SE in self etch group). Following which bonding protocol is followed according to manufacture instructions, a composite buildup of 2x3 mm is done on each specimen and then specimen were subjected to shear bond test under universal testing machine. All the readings were noted and subjected to statistical analysis using One way ANOVA and Tukey’s posthoc test.ResultsIt showed that there is no significant difference among the groups in both self-etch and total etch modes.ConclusionsIt can be concluded that application of an etching step prior to Universal Adhesives significantly improves their dentine penetration pattern, although this does not affect their mean SBS. The bond strength values of the TBU regardless of application mode were comparable to SBU making them reliable for working under different clinical conditions. Key words:Dentine bonding agents, self-etch mode, total etch mode, shear bond strength.

The influence of acid etching or chitosan dentin surface treatments on dentin wettability and shear bond strength of self- etch adhesives

“…Shear bond strength (SBS) is a mechanical test of the adhesive interphase that can provide an indication of the bond integrity between esthetic restorations and dentin surface. Reliable results were achieved in previous researches studying dentin-adhesives interphase (12)(13)(14)(15)(16)(17)(18)(19) .…”

Stability of Bonded Resin Composite Restorations to Enamel after Bleaching with 20% Carbamide Peroxide

“…40,41 Therefore, the presence of MDP in the SBadhesive may underlie the higher associated bond strength. 42 The chemical composition of TNB is based on a combination of hydrophilic hydroxyethyl methacrylate (HEMA), hydrophobic decanediol dimethacrylate (D3MA), intermediate bisphenol A glycidyl methacrylate (bis-GMA)monomers, MDP, and methacrylated carboxylic acid polymer (MCAP). 42 This combination of properties permits the TNB adhesive to dependably bridge the gap between the hydrophilic tooth structure and the hydrophobic restorative resin material under various surface conditions.…”

“…42 This combination of properties permits the TNB adhesive to dependably bridge the gap between the hydrophilic tooth structure and the hydrophobic restorative resin material under various surface conditions. 42 Moreover, both universal adhesives showed better bond strengths when the enamel surface was pre-treated with phosphoric acid. This finding agrees with the findings of many previous studies showing that applying acid etch in conjunction with SE adhesive systems, mainly in the enamel, is important.…”

Effect of Er: YAG Laser, Sandblast and Several Types of Universal Bonding on Shear Bond Strength of Zirconia Ceramic to Composite Resin

“…Regarding shear bond strength, results have demonstrated that Clearfil self-etch adhesive has superior bond strengths compared with Universal adhesives. 31 The results of studies show that substrate type is one of the factors that affect adhesive bonding. 32 In fact, the chemical properties of a substrate, which may be dental tissue or restorative materials, has an effect on the type of adhesive applied and the amount of strength it produces.…”