Abstract
The adhesion is a crucial issue in the bonding of dental restorative materials to tooth hard tissues. A strong and durable bond between artificial and natural materials is responsible for the success of the restoration in the oral cavity; therefore it has to be thoroughly examined before new restorative material is introduced to the market and used clinically. Among all methods used to examine bonding strength, most of them require a large number of healthy teeth to be conducted. In this paper, the bond strength between tooth hard tissues (dentin and enamel) and an exemplary restorative composite was examined with the non-conventional method, i.e. inverse gas chromatography. Dentin and enamel from bovine teeth were separated and subjected to the standard preparation procedure using the 3-component etch-and-rinse commercial bonding system. Tissues, as well as commercial restorative composite, were examined using inverse gas chromatography. The work of adhesion between dentin/enamel and composite was calculated. Obtained results were compared with the values of shear bond strength of six configurations, i.e. etched dentin/enamel-composite, primed dentin/enamel-composite, and bonded dentin/enamel-composite. All obtained results proved that there is a correlation between the values describing bond strength obtained from inverse gas chromatography and direct mechanical tests (shear bond strength tests). It proves that inverse gas chromatography is a powerful perspective tool for the examination of bond strength between tooth hard tissues and potential dental materials without using a large number of health tooth tissues.
Highlights
The adhesion is a crucial issue in the bonding of dental restorative materials to tooth hard tissues
A strong and durable bond between artificial and natural materials is responsible for the success of the restoration in the oral cavity; it is thoroughly examined before new restorative material is introduced to the market and used clinically
There is a correlation between the values of two parameters describing directly (SBS) and indirectly (WA) the bonding between tooth hard tissues and composite restorative material
Summary
The adhesion is a crucial issue in the bonding of dental restorative materials to tooth hard tissues. The bond strength between tooth hard tissues (dentin and enamel) and an exemplary restorative composite was examined with the non-conventional method, i.e. inverse gas chromatography. The most popular, this method still shows some drawbacks, in which the main is that the direction of the forces occurring during the test differs significantly from that which occurs during normal exploitation of restoratives (food chewing etc.) For this reason, tensile bond strength tests started to be used because they can evaluate the tension correctly. Tensile and microtensile strength tests are unable to mimic the clinical chewing force direction; artificial chewing simulators seem to be the best solution regarding the force direction Besides these methods, there are other mechanical, as well as microscopic, methods of examination of bonding strength between tooth tissues and r estoration[1]. Using the IGC data it is possible to calculate the value of work of adhesion (WA) between two solid materials[5]
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