Shear Bond Strength of Self-etch Adhesives to Enamel with Additional Phosphoric Acid Etching

Abstract

SUMMARYThis study evaluated the shear bond strength of self-etch adhesives to enamel and the effect of additional phosphoric acid etching.Seventy sound human molars were randomly divided into three test groups and one control group. The enamel surfaces of the control group (n=10) were treated with Syntac Classic (SC). Each test group was subdivided into two groups (each n=10). In half of each test group, ground enamel surfaces were coated with the self-etch adhesives AdheSe (ADH), Xeno III (XE) or Futurabond NR (FNR). In the remaining half of each test group, an additional phosphoric acid etching of the enamel surface was performed prior to applying the adhesives. The shear bond strength was measured with a universal testing machine at a crosshead speed of 1 mm/minute after storing the samples in distilled water at 37°C for 24 hours. Fracture modes were determined by SEM examination. For statistical analy-© Operative Dentistry, 2008, 33-2, 155-162 Clinical RelevanceWhen using self-etch adhesives to bond composite materials to enamel, there is concern about the ability to achieve bond strengths comparable to approved etch-and-rinse systems. An additional phosphoric acid etching can improve the shear bond strength of self-etch adhesives to enamel.

Effect of Enamel Etching Time on Roughness and Bond Strength

“…[4][5][6] Pre-etching enamel with phosphoric acid has been shown to increase the bond strength of self-etch systems. [7][8][9][10][11][12][13][14] These observations suggest that reduced etching of enamel may compromise optimum bond strength and durability. Fatigue testing of enamel bonds has also shown that self-etch adhesives do not perform to the same level as traditional phosphoric acid conditioning systems.…”

Comparative Evaluation of Self-etching Primers and Phosphoric Acid Effectiveness on Composite to Enamel Bond: An in vitro Study

“…Because demineralization and resin infiltration occur simultaneously when using self-etch adhesives, dissolved hydroxyapatite crystals and smear layer remnants get incorporated into the polymerized resin layer. 6,8,11 Mild self-etch Adper SE Plus showed the highest bond strength values, while the acidic Adper Easy One showed the lowest values. This finding is consistent with previous literature which states that mild two-step self-etching primers usually performs better than acidic one step self-etching primers.…”

Di̇ş Heki̇mli̇ği̇nde Adezi̇v Si̇stemler

“…Bu tür adeziv sistemler smear tabakasını çözebilmek ve dentini demineralize edebilmek için yüksek oranda su içermektedir [66][67][68][69] . Bu aşırı hidrofilik özellik, polimerizasyondan sonra yarı geçirgen bir membran gibi davranıp dentinden su geçişine izin vererek hidrolitik bozulmaya neden olan su kabarcıklarını oluşturmaktadır [70][71][72][73] .…”