Artículos de revistas
Influence Of Casting Methods On Marginal And Internal Discrepancies Of Complete Cast Crowns
Registro en:
Brazilian Dental Journal. , v. 15, n. 2, p. 127 - 132, 2004.
1036440
2-s2.0-15544375193
Autor
Milan F.M.
Consani S.
Correr Sobrinho L.
Sinhoreti M.A.C.
Sousa-Neto M.D.
Knowles J.C.
Institución
Resumen
The relationship between the application of die-spacer prior to wax pattern fabrication and metal removal from the inner surface of the casting on marginal and internal discrepancies of complete cast crowns was evaluated. One hundred and twenty complete crowns were cast with palladium-silver alloy melted by gas-oxygen torch or electrical resistance and cast with a centrifuge casting machine. After casting, the crowns were seated on each type of different marginal configuration dies (90-degree shoulder, 20-degree beveled shoulder, and 45-degree chamfered shoulder) with a static load of 90 N during 1 min. Evaluation of the marginal fit of the specimens was made using a digital micrometer. The crowns were embedded in acrylic resin and longitudinally sectioned to verify the internal discrepancy that occurred in lateral and occlusal interfaces with a digital micrometer. The data were submitted to ANOVA and Tukey's test with a significance level of 5%. The best marginal and inner fits were obtained with the gas-oxygen torch source. The 45-degree chamfered shoulder showed the best marginal and inner fit, and better internal relief was obtained in the crowns abraded with 50 μm Al2O3 particles. 15 2 127 132 Eames, W.B., O'Neal, S.J., Monteiro, J., Miller, C., Roan Jr., J.D., Cohen, K.S., Techniques to improve the seating of castings (1978) J Am Dent Assoc, 96, pp. 432-437 Carter, S.M., Wilson, P.R., The effect of die-spacing on crown retention (1996) Int J Prosthodont, 9, pp. 21-29 Passon, C., Lambert, R.H., Lambert, R.L., Newman, S., The effect of multiple layers of die-spacer on crown retention (1992) Oper Dent, 17, pp. 42-49 Carter, S.M., Wilson, P.R., The effects of die-spacing on post-cementation crown elevation and retention (1997) Aust Dent J, 42, pp. 192-198 Campagni, R., Preston, J.D., Reisbeck, M.H., Measurement of paint-on die spacers used for casting relief (1982) J Prosthet Dent, 47, pp. 606-611 Grajower, R., Lewinstein, I., Zelster, C., The effective minimum cement thickness of zinc phosphate cement for luted non-precious crowns (1985) J Oral Rehabil, 12, pp. 235-245 Gegauff, A.G., Rosenstiel, S.F., Reassessment of die-spacer with dynamic loading during cementation (1989) J Prosthet Dent, 61, pp. 655-658 Vermilyea, S.G., Kuffler, M.J., Huget, E.F., The effects of die relief agent on the retention of full coverage castings (1983) J Prosthet Dent, 50, pp. 207-210 Veronesi, S.G., Consani, S., Ruhnke, L.A., The influence of casting methods on the surface microhardness and crystalline formation of aluminum-copper alloys (1992) J Prosthet Dent, 67, pp. 26-29 Dedemon, H.W., The relationship between open margins and margin designs on full cast crowns made by commercial dental laboratories (1985) J Prosthet Dent, 53, pp. 463-465 Shillingburg, H.T., Hobo, S., Fischer, D.W., Preparation design and margin distortion in porcelain-fused-to-metal restorations (1973) J Prosthet Dent, 29, pp. 276-284 Zidan, O., Ferguson, G.C., The retention of complete crowns prepared with three different tapers and luted with four different cements (2003) J Prosthet Dent, 89, pp. 565-571 Byrne, G., Influence of finish-line form on crown cementation (1992) Int J Prosthodont, 5, pp. 137-144 Syu, J.Z., Byrne, G., Laub, L.W., Land, M.S., Influence on finish-line geometry on the fit of crown (1993) Int J Prosthodont, 6, pp. 25-30 Strandman, E., Glantz, P., On the characteristics of acetylene-oxygen flames used in dental casting (1976) Odont Revy, 27, pp. 197-222 Hollenback, G.M., Practical contribution to the standardization of casting technique (1928) J Am Dent Assoc, 40, pp. 520-525 (1964) Metals Handbook, 8th Ed., p. 1194. , Ohio Christensen, G.J., Marginal fit of gold inlay castings (1966) J Prosthet Dent, 16, pp. 297-305 Dedmon, H.W., Disparity in expert opinions on size of acceptable margin opening (1982) Oper Dent, 7, pp. 97-101 McLean, J.W., Von Fraunhofer, J.A., The estimation of cement film thickness by an in vivo technique (1971) Brit Dent J, 131, pp. 107-111