Over-refractory casting technique as an alternative to one-piece multi-unit fixed partial denture frameworks

dc.creatorCorrea, GD
dc.creatorHenriques, GEP
dc.creatorMesquita, MF
dc.creatorSobrinho, LC
dc.date2006
dc.dateMAR
dc.date2014-11-14T02:55:09Z
dc.date2015-11-26T16:04:10Z
dc.date2014-11-14T02:55:09Z
dc.date2015-11-26T16:04:10Z
dc.date.accessioned2018-03-28T22:53:16Z
dc.date.available2018-03-28T22:53:16Z
dc.identifierJournal Of Prosthetic Dentistry. Mosby, Inc, v. 95, n. 3, n. 243, n. 248, 2006.
dc.identifier0022-3913
dc.identifierWOS:000236291500012
dc.identifier10.1016/j.prosdent.2006.01.001
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/81551
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/81551
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/81551
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1265415
dc.descriptionStatement of problem. Soldering has been suggested to achieve acceptable fit of multi-unit fixed partial denture (FPD) frameworks of 3 or more elements. However, distortion of the entire framework may occur. Purpose. The purpose of this study was to evaluate marginal fit in 1-piece-casting FPD frameworks comparing 2 casting techniques: the conventional technique (CT) and the over-refractory, technique (ORT). The techniques were evaluated on castings made from commercially pure titanium (CP Ti; Tritan), titanium-aluminum-vanadium (Ti-6AI-4V), and nickel-chromium (Ni-Cr; VeraBond II) alloys. Material and methods. A metal master cast including 3 preparations was created to simulate a 5-unit FPD. The metal cast was duplicated in vinyl polysiloxane for fabrication of 60 working casts. For the CT, 0.7-mm-thick patterns were waxed on the casts using an electrical wax-clipping unit. Patterns were removed from the preparations before investing. For the ORT, the silicone impressions were poured with an investment material (Rematitan for CP Ti and Ti-6Al-4V, and Talladium for Ni-Cr). The patterns were waxed on the refractory casts, and the assembly, was invested. Both CT and ORT (n=10), CP Ti, and Ti-6Al-4V frameworks were cast using an arc-melting titanium vacuum-casting machine. The Ni-Cr frameworks were cast using an automated centrifugal-casting machine. The mean marginal discrepancies of the frameworks were measured at the mesial, distal, buccal, and lingual interfaces. Marginal gap measurements were recorded 3 times for each surface to the nearest 0.5 mu m using a traveling microscope (X50). The data were analyzed with 2-way analysis of variance, followed by the Tukey HSD test (alpha=.05). Results. Marginal discrepancies for the ORT specimens (82.8 +/- 1.7 mu m for CP Ti; 64.4 +/- 1.3 mu m for Ti-6Al-4V; and 77.2 +/- 1.5 mu m-for Ni-Cr) were significantly lower than those obtained for the CT specimens (106.3 +/- 2.6 mu m for CP Ti; 75.7 +/- 0.8 mu m for Ti-6Al-4V; 101.9 +/- 1.7 mu m for Ni-Cr) (P <.05). For both techniques, marginal discrepancies were significantly different among the alloys evaluated, presenting the following order firorn greatest to least marginal discrepancy: CP Ti, Ni-Cr alloy, and Ti-6AI-4V (P <.05). Conclusion. The ORT for multi-unit FPD frameworks demonstrated significantly lower marginal discrepancies than the CT.
dc.description95
dc.description3
dc.description243
dc.description248
dc.languageen
dc.publisherMosby, Inc
dc.publisherSt Louis
dc.publisherEUA
dc.relationJournal Of Prosthetic Dentistry
dc.relationJ. Prosthet. Dent.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectCommercially Pure Titanium
dc.subjectTi-6al-4v Alloy
dc.subjectAccuracy
dc.subjectCopings
dc.subjectFatigue
dc.subjectFit
dc.titleOver-refractory casting technique as an alternative to one-piece multi-unit fixed partial denture frameworks
dc.typeArtículos de revistas


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