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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

Publication:
July/August 1996
Volume 9 , Issue 4

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Tensile bond strength of resin luting cement to a porcelain-fusing noble alloy

Stokholm/Isidor/Ravnholt

Pages: 323-330
PMID: 8957870

This study evaluated the tensile bond strength of resin composites to a noble alloy for ceramic bonding after various surface treatments. The flat end of bars cast in the alloy were used as test specimens. Eighteen clinically relevant combinations of luting agent, airbone particle abrasion, and surface treatment were applied. After surface treatment, two bars were bonded together. Resin cement, either dual-polymerizing (Twinlock) or chemically polymerizing (Panavia EX, Panavia 21, or RBBC), was used as a luting agent. The specimens were subjected to 1,000 thermal cycles between 15 degrees C before tensile bond strength testing. The highest median bond strengths were obtained using the Silicoater MD method/Twinlook (20.6 to 26.1 MPa) or with tin-plating/Panavia EX (24.0 MPa), but more low values were recorded among the latter specimens. Tin-plating/Panavia 21 gave median tensile bond strengths (18.1 MPa) similar to tin-plating/Panavia EX. The Silicoater MD method resulted in similar bond strengths with or without the addition of a layer of Opaquer. The traditional Silicoater method (8.0 to 12.4 MPa) gave significantly lower median tensile bond strength values, and the lost sugar crystals method resulted in a tensile bond strength of 15.4 MPa

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