Bond strength of adhesive systems to human tooth enamel

Abstract

The purpose of this study was to evaluate in vitro three adhesive systems: a total etching single-component system (G1 Prime & Bond 2.1), a self-etching primer (G2 Clearfil SE Bond), and a self-etching adhesive (G3 One Up Bond F), through shear bond strength to enamel of human teeth, evaluating the type of fracture through stereomicroscopy, following the ISO guidance on adhesive testing. Thirty sound premolars were bisected mesiodistally and the buccal and lingual surfaces were embedded in acrylic resin, polished up to 600-grit sandpapers, and randomly assigned to three experimental groups (n = 20). Composite resin cylinders were added to the tested surfaces. The specimens were kept in distilled water (37°C/24 h), thermocycled for 500 cycles (5°C-55°C) and submitted to shear testing at a crosshead speed of 0.5 mm/min. The type of fracture was analyzed under stereomicroscopy and the data were submitted to Anova, Tukey and Chi-squared (5%) statistical analyses. The mean adhesive strengths were G1: 18.13 ± 6.49 MPa, (55% of resin cohesive fractures); G2: 17.12 ± 5.80 MPa (90% of adhesive fractures); and G3: 10.47 ± 3.14 MPa (85% of adhesive fractures). In terms of bond strength, there were no significant differences between G1 and G2, and G3 was significantly different from the other groups. G1 presented a different type of fracture from that of G2 and G3. In conclusion, although the total etching and self-etching systems presented similar shear bond strength values, the types of fracture presented by them were different, which can have clinical implications. Descriptors: Shear strength; Dentin-bonding agents; Dental enamel.Resumo: O objetivo deste estudo foi avaliar in vitro três sistemas adesivos: um monocomponente com condicionamento ácido total (G1 Prime & Bond 2.1), um "primer" autocondicionante (G2 Clearfil SE Bond) e um adesivo autocondicionante (G3 One Up Bond F), através de resistência ao cisalhamento ao esmalte de dentes humanos, avaliando o tipo de fratura por estereomicroscopia, seguindo as normas ISO para testes adesivos. Trinta pré-molares hígidos foram seccionados ao meio em sentido mésio-distal, incluídos em resina acrílica, polidos até lixa d'água de granulação 600 e aleatoriamente divididos em três grupos (n = 20). Cilindros de resina composta foram adicionados às superfícies de teste. Os espécimes foram armazenados em água destilada (37°C/24 h), termociclados por 500 ciclos (5°C-55°C) e submetidos ao teste de cisalhamento com velocidade de 0,5 mm/min, sendo o tipo de fratura analisado sob estereomicroscopia e os dados submetidos à análise estatística Anova, Tukey e Qui-quadrado (5%). As médias de resistência adesiva foram: G1: 18,13 ± 6,49 MPa, (55% de fraturas coesivas em resina); G2: 17,12 ± 5,80 MPa (90% de fraturas adesivas) e G3 10,47 ± 3,14 MPa (85% de fraturas adesivas). Em termos de resistência adesiva, não houve diferenças significantes entre G1 e G2, tendo G3 apresentado diferença significante em relação aos demais grupos. G1 apresentou tipo de fratura diferente de G2 e G3. Em...

Comparing the Shear Bond Strength of Six Adhesive Systems to Enamel of Primary Teeth

“…The results of present study are similar to some other studies which compared self-etch and etch-and-rinse adhesive systems [8][9][10]. According to one SEM study, resin tags which formed in enamel after self-etch adhesives' application was lesser and with lower depth of penetration in comparison with etch-and-rinse adhesives [11].…”

Effect of ozone gas on the shear bond strength to enamel

“…However, the resin-dentin adhesion had to be improved through the years and new adhesive systems have been developed for that purpose 11, 20 . Self-etch systems based on acidic monomers that simultaneously condition and prime dental tissue, were developed to simplify and eliminate some of the clinical steps associated to wet dentin-bonding 20 . With these systems, primer application dissolves the smear layer and incorporates it into the bonding process; as a result the tooth no longer requires rinsing, as it does with etch-and-rinse systems.…”

The Challenge of MDP Monomer Containing Adhesive Systems: Comparison of Shear Bond Strengths

“…The shear bond strengths of three different manufacturer's MDP(or MDP like) containing adhesives were tested in this study. It has been postulated that the minimum bond strength of [17][18][19][20] Mpa is needed to resist contraction forces of resin composite materials for tooth hard tissues and also clinical experiences confirm that this bond strength is sufficient for successful retention of resin restoration 4,6,9,11,12,15 . All adhesive systems used in this present study achieved the optimal bond strength values.…”

“…And there are various results about their bonding successes in literature. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Adhesion of resin materials to enamel has become a routine and reliable aspect of contemporary clinical dentistry because of enamel's highly inorganic substrate but adhesion to dentin has proved to be more difficult and less predictable due to the complex structure of dentin with a low inorganic content, heterogenous nature, presence of dentinal fluid and smear layer. 11-15,17,18. Formerly there were seperate chemical components and also several application steps were needed for priming and bonding.…”