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  • Title: Shear bond strengths of composite bonded to porcelain using porcelain repair systems.
    Author: Knight JS, Holmes JR, Bradford H, Lawson C.
    Journal: Am J Dent; 2003 Aug; 16(4):252-4. PubMed ID: 14579880.
    Abstract:
    PURPOSE: To measure and compare the shear bond strengths to porcelain of two composites used with each of two different porcelain bonding systems. METHODS: 40 porcelain specimens were mounted in acrylic resin, ground flat using 120 and 320 grit sandpaper, and randomly divided into four groups of 10 for specimen fabrication as follows: Group 1: Premier MicroDose Porcelain Bonding/Optibond FL adhesive/Prodigy composite; Group 2: Premier MicroDose Porcelain Bonding/PQ1 adhesive/Amelogen composite; Group 3: Ultradent Porcelain Etch/Optibond FL adhesive/Prodigy composite; Group 4: Ultradent Porcelain Etch/PQ1 adhesive/Amelogen composite. Manufacturers' directions were followed to treat the porcelain surface and apply the adhesive and composite to each specimen. Following storage in distilled water at 37 degrees C for 7 days, the specimens were subjected to shear testing using an MTS 858 Universal Testing Machine. Data were recorded and analyzed using a one-way ANOVA and t-test. RESULTS: There was no significant difference in mean shear bond strength among the four groups (P = 0.575) or between the two groups with the highest and lowest mean shear bond strength (P = 0.288). The mean shear bond strength for all groups exceeded 21 MPa and 39 of 40 specimens exhibited cohesive fracture in porcelain.
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