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Influence of casting methods on marginal and internal discrepancies of complete cast crowns.

Milan, FM; Consani, S; Correr Sobrinho, L; Sinhoreti, MAC; Sousa-Neto, MD; Knowles, JC; (2004) Influence of casting methods on marginal and internal discrepancies of complete cast crowns. Braz Dent J , 15 (2) pp. 127-132. 10.1590/s0103-64402004000200008. Green open access

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Abstract

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 microm Al2O3 particles.

Type: Article
Title: Influence of casting methods on marginal and internal discrepancies of complete cast crowns.
Location: Brazil
Open access status: An open access version is available from UCL Discovery
DOI: 10.1590/s0103-64402004000200008
Keywords: Analysis of Variance, Cementation, Crowns, Dental Alloys, Dental Casting Technique, Dental Marginal Adaptation, Palladium, Silver, Statistics, Nonparametric, Tooth Preparation, Prosthodontic
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute > Biomaterials and Tissue Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1314510
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