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Morphology of resin–dentin interfaces after Er,Cr:YSGG laser and acid etching preparation and application of different bonding systems

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Abstract

The goal of this study was to show the modifications in the ultrastructure of the dentin surface morphology following different surface treatments. The stability of the adhesive compound with dentin after laser preparation compared with conventional preparation using different bonding agents was evaluated. An Er,Cr:YSGG laser and 36% phosphoric acid in combination with various bonding systems were used. A total of 100 caries-free human third molars were used in this study. Immediately after surgical removal teeth were cut using a band saw and 1-mm thick dentin slices were created starting at a distance of 4 mm from the cusp plane to ensure complete removal of the enamel. The discs were polished with silicon carbide paper into rectangular shapes to a size of 6 × 4 mm (±0,2 mm).The discs as well as the remaining teeth stumps were stored in 0.9% NaCl at room temperature. The specimens were divided into three main groups (group I laser group, group II etch group, group III laser and etch group) and each group was subdivided into three subgroups which were allocated to the different bonding systems (subgroup A Excite, subgroup B Scotchbond, subgroup C Syntac). Each disc and the corresponding tooth stump were treated in the same way. After preparation the bonding composite material was applied according to the manufacturers’ guidelines in a hollow tube of 2 mm diameter to the disc as well as to the corresponding tooth stump. Shear bond strength testing and environmental scanning electron microscopy were used to assess the morphology and stability of the resin–dentin interface. The self-etching bonding system showed the highest and the most constant shear values in all three main groups, thus enabling etching with phosphoric acid after laser preparation to be avoided. Thus we conclude that laser preparation creates a surface texture that allows prediction of the quality of the restoration without the risk of negative influences during the following treatment steps. This can easily and repeatedly be achieved.

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All authors state that they have no conflicts of interest.

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Authors and Affiliations

  1. Department of Conservative Dentistry, Dental School, Bernhard Gottlieb University Clinic of Dentistry, Sensengasse 2a, 1090, Vienna, Austria

    Franziska Beer, Alfred Buchmair, Wolfram Körpert, Leila Marvastian & Andreas Moritz

  2. Department of Solid State Physics, Technical University of Vienna, Wiedner Hauptstrasse 8-10, 1040, Vienna, Austria

    Johann Wernisch

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  1. Franziska Beer
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  2. Alfred Buchmair
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  3. Wolfram Körpert
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  4. Leila Marvastian
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  5. Johann Wernisch
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  6. Andreas Moritz
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Correspondence to Franziska Beer.

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Beer, F., Buchmair, A., Körpert, W. et al. Morphology of resin–dentin interfaces after Er,Cr:YSGG laser and acid etching preparation and application of different bonding systems. Lasers Med Sci 27, 835–841 (2012). https://doi.org/10.1007/s10103-011-0979-x

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  • DOI: https://doi.org/10.1007/s10103-011-0979-x

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