Parameters affecting in vitro bond strength for composites to enamel and dentin

The aim of this study was to explore and compare the results of occlusal load application to cusp-replacing composite restorations, studied by means of finite element (FE) analysis and in vitro load tests. A three-dimensional (3D) FE model was created with a set up similar to an in vitro load test that assessed the fatigue resistance of upper premolars with buccal cusp-replacing resin composite restorations. Occlusal load was applied to two geometries (with and without palatal cuspal coverage), and the tooth-restoration interface and composite material stresses were calculated. Subsequently, safety factors were calculated by dividing the material strength values by the obtained stresses. The highest safety factors were observed for the restorations with cuspal coverage. This was consistent with the load test, in which cuspal coverage led to higher fracture resistance. Furthermore, the FE analysis predicted that failure of the tooth-restoration interface is more likely than failure of the composite material. Correspondingly, the load test showed predominantly adhesive failures of the restorations. Although the described test methods did not lead to a complete understanding of the failure mechanism, it can be concluded that the FE analysis provides additional information with regard to the differences in fracture behaviour of these types of restorations.

show abstract

“… *Enamel tensile bond strength Clearfil Photobond (Kuraray, Osaka, Japan): 19–24 MPa, adapted from Y amaguchi et al. (21). …”

Section: Resultsmentioning

confidence: 99%

Can internal stresses explain the fracture resistance of cusp‐replacing composite restorations?

Fennis¹,

Kuijs

Barink

et al. 2005

European J Oral Sciences

View full text Add to dashboard Cite

show abstract

“…(Perdigao et al, 1994) The shallow depth of intertubular dentin demineralization and the presence of a cuff of superficial peritubular dentin in all the specimens etched with silica-thickened gels may have been caused by a less aggressive effect of the respective etchant. Consequently, this may favor the establishment of high dentin bond strengths, since more calcium might be available (Yamaguchi et al, 1989).…”

Section: Discussionmentioning

confidence: 99%

Comparison of Two Different Etch Systems as Adhesion Resistance in Dental Adhesive Systems

Öztoprak¹,

Öztoprak²

2022

Proceedings of the 9th International Conference on Advanced Materials and Systems

View full text Add to dashboard Cite

Adhesive systems are used in many specialties in dentistry. These systems provide chemical attachment of prosthetic and restorative materials to the tooth surface. The first stage of adhesive systems is the etching process. In the commonly used Total etch systems, acid agent is applied to the tooth first to create roughness on the tooth surface, then the applied bond agent enters this rough surface to ensure retention. The acid agent used is 37% phosphoric acid gel. Normally, phosphoric acid is liquid. It should be applied in gel form in order to be applied in a controlled manner to a certain surface of the tooth and to remain on the desired surface for a long time. Commercially used phosphoric acid gels are produced by a single method and contain the carbomer chemical. Another way to produce gel is silicium dioxide. Acid gels produced with carbomer have a glossy appearance, while acids produced with Silicium have a matte appearance. In this study, we aimed to see the difference in retention of the phosphoric acid gel produced with silicium dioxide compared to the carbomeric acid gel. In this study, we prepared phosphoric acid gel with silicium dioxide and phosphoric acid with carbomer. In our study, 50 extracted caries-free human teeth were used. Orthodontic buttons were attached to the buccal surfaces of the teeth in 2 groups. Phosphoric acid gel prepared with Carbomer was applied for 40 seconds on 25 teeth and phosphoric acid gel prepared with silicium dioxide for 40 seconds on 25 teeth. Afterwards, the teeth were washed with water for 10 seconds and dried, and the orthodontic buttons were adhered with blue light for 40 seconds with Tokuyama bond and flowable composite, and a tensile test was applied to them. There was a statistically significant difference between the tensile force resistance of the buttons attached with two different methods. The teeth in which the gel prepared with silicium dioxide was used showed an average of 6% more resistance to tensile force than the other group. In this study, adhesion strength was measured for the first time by changing the gel base material in acid. We recommend this preparation of acids in adhesive systems, and we believe it can be beneficial for all dentists.

show abstract

Section: Discussionmentioning

confidence: 99%

Proceedings of the 9th International Conference on Advanced Materials and Systems

2022

View full text Add to dashboard Cite

show abstract

Parameters affecting in vitro bond strength for composites to enamel and dentin

Cited by 11 publications

References 18 publications

Can internal stresses explain the fracture resistance of cusp‐replacing composite restorations?

Can internal stresses explain the fracture resistance of cusp‐replacing composite restorations?

Comparison of Two Different Etch Systems as Adhesion Resistance in Dental Adhesive Systems

Proceedings of the 9th International Conference on Advanced Materials and Systems

Contact Info

Product

Resources

About