Title: Shear bond strength of techniques for bonding esthetic veneers to metal
Abstract: Statement of problem. New composites with improved qualities have been introduced to the dental profession as alternatives to porcelain. There is concern about the strength and reliability of new metal-resin bonding systems when these composites are used as esthetic veneers over metal frameworks. Purpose. This in vitro study compared the shear bond strength of 2 metal-resin bonding techniques with the bond strength of conventional porcelain fused-to-metal (PFM). Effects of water storage and thermocycling were also evaluated. Material and methods. Ninety disks, cast in a medium gold, high noble PFM alloy, were divided equally into 6 groups, and received 3 treatments for veneering: conventional feldspathic porcelain on 1 group, and a composite (Artglass) bonded to the metal, using 2 metal-resin bonding techniques. Specimens were tested in shear, half of them after a 24-hour dry storage at room temperature and the rest after 10-day storage in normal saline solution at 37°C and thermocycling. Fractured specimens were evaluated under ×10 magnification to determine the nature of failure. Statistical analysis was performed with 2-factor analysis of variance (ANOVA). Results. Mean shear bond strength values before and after wet storage and thermocycling were 29.66 and 22.91 MPa for the PFM group; 21.43 and 17.92 MPa for the Siloc group; and 19.34 and 15.64 for the etched group, respectively. The PFM group exhibited significantly higher bond strength values compared with the other 2 groups (P <.001). All groups showed a significant decrease in bond strength values after wet storage and thermocycling (P <.001). Conclusion. Wet storage and thermocycling caused a significant decrease in shear bond strength of all specimens. Shear bond strength of conventional feldspathic PFM was significantly higher than that of the 2 metal-resin bonding techniques tested. The 2 latter techniques did not reveal any statistically significant differences. (J Prosthet Dent 1999;82:608-14.)
Publication Year: 1999
Publication Date: 1999-11-01
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 23
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