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Updated: May 17, 2026
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Enamel and dentin bond strength of new simplified adhesive materials with and without preliminary phosphoric
Jelena Juloski1, Cecilia Goracci, Carlo Rengo
1Department of Dental Materials and Fixed Prosthodontics, University of Siena, Policlinico Le Scotte, Viale Bracci, 53100 Siena, Italy. jelenajuloski@gmail.com
Purpose:
To assess the influence of preliminary phosphoric acid-etching on shear bond strength (SBS) to enamel and dentin of a self-adhering restorative composite and of a new self-etch adhesive used in combination with the proprietary flowable composite.
Methods:
100 human molars were selected. SBS was assessed on flat buccal enamel surfaces and mid-coronal dentin. Teeth from each group were divided into five subgroups (n=10): (1) FL: etch-and-rinse adhesive OptiBond FL/Premise flowable; (2) XTR: 2-step self-etch adhesive OptiBond XTR/Premise flowable; (3) eXTR: OptiBond XTR on etched substrates/Premise flowable; (4) VF: self-adhering flowable composite Vertise Flow; (5) eVF: Vertise Flow on etched substrates. Specimens were stressed in shear until failure. Failure modes were evaluated under a stereomicroscope. Data were analyzed by two-way ANOVA and Fisher's exact test (P< 0.05).
Results:
Dental substrate, material and between-factor interaction significantly influenced SBS (MPa). In FL group (16.83 +/- 2.93) significantly higher SBS to enamel than in the other groups (XTR 8.59 +/- 4.39; eXTR 7.04 +/- 3.63; VF 6.61 +/- 2,41; eVF 9.87 +/- 4.24) was measured. On dentin FL (8.15 +/- 3.88) performed similarly to XTR (10.60 +/- 5.0), eXTR (9.60 +/- 4.91) and eVF (5.48 +/- 4.94); VF recorded significantly lower SBS (2.94 +/- 2.79 MPa). Failure modes differed significantly among groups.
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