219 Resin Cements Bonded on Different Treated Non-precious and Semi-precious Metal-alloys

Thursday, March 22, 2012: 2 p.m. - 3:15 p.m.
Presentation Type: Poster Session
A.J. ST-GEORGES, L. NASERI, H. CIABURRO, and P. ROMPRÉ, Restorative dentistry, Universite de Montreal, Montreal, QC, Canada

With self-etch resin cements becoming more popular, some dentists may be tempted to use them to bond Maryland bridge. Objective: To compare the shear bond strength of a self-etch versus a total-etch resin cements when bonded to enamel and metal-alloy treated surfaces. Methods: Flat enamel (E) surfaces (n=15/group), non-precious metal-alloy (Np) disks (n=15/group), semi-precious metal-alloy (Sp) disks (n=15/group) were mounted in cold-cure acrylic rings. Cylinders (d=2.38mm x h=3.0mm) of Clearfil Esthetic Cement & DC Bond Kit (C) and RelyX Unicem (R) resin cements were bonded to enamel and to metal-alloy prepared surfaces (sandblast (SB), SB + sulfuric acid (SA) or SB + tin deposition (T)), polymerized, stored (H2O, 37°C, 24hours) and thermocycled (500 cycles). Samples were tested individually in an Instron Universal Testing machine (1mm/min). Statistical analysis was done using a T-test comparison followed by a post hoc multiple comparisons (p£0.05). Results:

Bond strength MPa


Non-precious metal-alloy

Semi-precious metal-alloy

(Mean  ±  sd)

(Mean  ±  sd)

(Mean  ±  sd)

Resin Cements





SB + T

Clearfil Esthetic Cement

33.97 ±  17.18a

25.21 ±  14.66a, b

34.11 ±  15.57a

34.60 ±  14.86a

18.43 ±  10.83b

RelyX Unicem

10.48 ±  11.23b

15.96 ±  3.37b

18.90 ±  9.55b

11.41 ±  10.53c

10.08 ±  7.68c

For each group, values with same superscript are not significantly different. Results on enamel showed that the total-etch resin cement (C) had a statistically significant higher bond strength (33.97±17.18 MPa) than the self-etch resin cement (R) (10.48±11.23 MPa) (p£0.05). In the Sp group, a thin layer of tin added on the sandblasted metal surface reduced the bond strength significantly with the C resin cement (p£0.05). Conclusion: The total-etch resin cement (C) showed a statistically significant higher bond strength than the self-etch resin cement (R) on enamel and on three (Np-SB+SA; Sp-SB; Sp-SB+T) of the four metal-alloy surface groups.



Keywords: Adhesion, Alloys, Composites, Enamel and Surfaces
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