This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Anusavice, K.J. Articles by Carroll, J.E. Search for Related Content PubMed PubMed Citation Articles by Anusavice, K.J. Articles by Carroll, J.E. Social Bookmarking                         What's this?

Effect of Incompatibility Stress on the Fit of Metal-Ceramic Crowns

Department of Dental Biomaterials, College of Dentistry, University of Florida, Box J-446, JHMHC, Gainesville, Florida 32610-0446

J.E. Carroll

Keesler Medical Center, U.S. Air Force, Biloxi, Mississippi 39534

The interactive effect of coping thickness and a positive thermal contraction mismatch between metal and porcelain on the fit of metal-ceramic crowns has not yet been experimentally determined. Previous studies have suggested that marginal distortion may be due to contraction differences, although finite element analyses indicate that these distortion effects should be negligible.

The marginal gap between metal-ceramic crowns and prepared dies was determined under conditions designed to exaggerate distortion effects. These included the use of thin metal copings (0.1 and 0.2 mm), a chamfer preparation, an alloy with relatively poor creep resistance, and a large thermal contraction mismatch between the alloy and porcelain layers. Gap changes which resulted during porcelain firing cycles were relatively small, but larger marginal discrepancies developed in crowns prepared with a compatible porcelain during grinding and abrasive blasting procedures. This study conclusively demonstrates that incompatibility stress induced by a positive contraction mismatch is not a primary cause of marginal or generalized distortion of metal-ceramic crowns and suggests that external grinding and internal abrasive blasting of crowns are more likely causes of this effect.

REFERENCES

• Ando, N.; Hakamura, K.; Namiki, T.; Sugata, T.; Suzuki, T.; and Moriyama, K. (1972): Deformation of Porcelain Bonded Gold Alloys, J Jpn Soc Appar Mater 13:237-248.
• Anusavice, K.J.; Shen, C.; Hashinger, D.; and Twiggs, S.W. (1985): Interactive Effect of Stress and Temperature on Creep of PFM Alloys, J Dent Res 64:1094-1099.[Abstract/Free Full Text]
• Buchanan, W.T.; Svare, C.W.; and Turner, K.A. (1981): The Effect of Repeated Firings and Strength on Marginal Distortion in Two Ceramometal Systems, J Prosthet Dent 45:502-506.[Medline] [Order article via Infotrieve]
• Dederich, D.N.; Svare, C.W.; Peterson, L.C.; and Turner, K.A. (1984): The Effect of Repeated Firings on the Margins of Nonprecious Ceramometals, J Prosthet Dent 51:628-630.[Medline] [Order article via Infotrieve]
• Dehoff, P.H. and Anusavice, K.J. (1984): Effect of Metal Design on Marginal Distortion of Metal-Ceramic Crowns, J Dent Res 63:1327-1331.[Abstract/Free Full Text]
• Faucher, R.R. and Nicholls, J.I. (1980): Distortion Related to Margin Design in Porcelain-fused-to-Metal Restorations, J Prosthet Dent 43:149-155.[Medline] [Order article via Infotrieve]
• Iwashita, H.; Kuriki, H.; Hasuo, T.; Ishikawa, K.; Hashimoto, K.; Harada, H.; Uochi, T.; and Hata, Y. (1977): Studies on Dimensional Accuracy of Porcelain-fused-to-Precious-Metal Crowns. The Influence of the Porcelain to the Metal Coping on the Porcelain Fusing Procedure, Shigaku 65:110-125.[Medline] [Order article via Infotrieve]
• Kulmer, S.; Feichtinger, C.; Gausch, K.; and Sattler, C.O. (1978): Dimensionsanderung der Kronendurchmesser von Metallkeramikkronen wahrend des Oxydgluhens, Österr Z Stomatol 75:408-410.[Medline] [Order article via Infotrieve]
• Shillingburg, H.T.; Hobo, S.; and Fisher, D.W. (1973): Preparation, Design and Margin Distortion in Porcelain-fused-to-Metal Restorations, J Prosthet Dent 29:276-284.[CrossRef][Medline] [Order article via Infotrieve]

Journal of Dental Research, Vol. 66, No. 8, 1341-1345 (1987)
DOI: 10.1177/00220345870660081101


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Anusavice, K.J. Articles by Carroll, J.E. Search for Related Content PubMed PubMed Citation Articles by Anusavice, K.J. Articles by Carroll, J.E. Social Bookmarking                         What's this?