Effects of firing cycle and surface finishing on distortion of metal ceramic castings

Campbell, Stephen D.; Sirakian, A; Pelletier, Lionel B.; Giordano, Russell

doi:10.1016/s0022-3913(05)80348-8

Cited by 46 publications

(49 citation statements)

References 16 publications

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“…It has been widely observed in the literature that the fit of metal ceramic restorations deteriorates during the high temperature firing cycles used for porcelain veneering, and the deformation mostly occurs at the initial firing cycle (oxidation), before the application of porcelain 17,18,19,20,21,22,23,24 . The release of casting residual stresses during this initial firing seems to be the primary factor for much of the dimensional changes of these metal structures 19,21,25 .…”

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confidence: 99%

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confidence: 99%

“…The release of casting residual stresses during this initial firing seems to be the primary factor for much of the dimensional changes of these metal structures 19,21,25 . Several authors have suggested a pre-heat treatment of metal before the clinical try in 19,22,24,25 . According to these authors, the pre-heat treatment would allow a better clinical evaluation of the metal structure and the following firing cycles which are performed for the porcelain veneering of the restoration, could be performed without additional metal distortion.…”

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confidence: 99%

“…Some studies 18,19,20,22 found that the dimensional alterations were observed only after the oxidation cycle and no significant dimensional alterations were seen after opaque, body and glaze firings.…”

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confidence: 99%

“…The frameworks were machined before the preheat treatment due to the reported data that surface stresses induced by machining of the metallic framework are shown to release in the first firing cycle 19,20,21 . Thus the aim of machining before preheat treatment was to release the stresses.…”

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Strain Gauge Analysis of the Effect of Porcelain Firing Simulation on the Prosthetic Misfit of Implant-Supported Frameworks

et al. 2012

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OBJECTIVES: This study investigated the effect of porcelain firing on the misfit of implantsupported frameworks and analyzed the influence of preheat treatment on the dimensional alterations. MATERIALS AND METHODS: Four external-hex cylindrical implants were placed in polyurethane block. Ten frameworks of screw-retained implant-supported prostheses were cast in Pd-Ag using 2 procedures: (1) control group (CG, n = 5): cast in segments and laser welded; and test group (TG, n = 5): cast in segments, preheated, and laser welded. All samples were subjected to firing to simulate porcelain veneering firing. Strain gauges were bonded around the implants, and microstrain values ( = 10 ) were recorded after welding (M1), oxidation cycle (M2), and glaze firing (M3). Data were statistically analyzed (2-way analysis of variance, Bonferroni, = 0.05). RESULTS: The microstrain value in the CG at M3 (475.2 ) was significantly different from the values observed at M1 (355.6 ) and M2 (413.9 ) ABSTRACT (189 WORDS)Objectives: This study investigated the effect of porcelain firing on the misfit of implant-supported

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Strain Gauge Analysis of the Effect of Porcelain Firing Simulation on the Prosthetic Misfit of Implant-Supported Frameworks

et al. 2012

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Thermal creep analysis of noble metal alloys for the ceramic-fused-to-metal technique

Fischer

Baltzer

Fleetwood

1999

J. Biomed. Mater. Res.

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Distortion of metal frameworks for the ceramic fused to metal technique during firing is attributed to thermal creep of the alloys. Usually thermal creep measurements are performed at constant load and constant temperature over varying time periods. Because metal frameworks for the ceramic-fused-to-metal technique are cyclically stressed, a three-point bending test for dynamic measurement of creep in a modified dilatometer was developed. Bending of 14 commercially available noble metal alloys was determined in the as-cast state, as well as after simulation of the firing process. The sag at 950 degrees C, which is the firing temperature of the ceramic, was chosen as an indicator for creep. No correlation of this value to other technical data of the alloys was observed, but it was found that sag correlates with the sum of the Au and Ag content of the alloys. A strong sag was observed with high (Au + Ag) content. The lowest sag values were found with a content in the range of 50 atom % (Au + Ag). At lower (Au + Ag) content Pd becomes the main component in the alloys, and the values for sag increased slightly. The method for dynamic measurement of creep gave reproducible results and offers a possible test for rapid qualitative creep assessment.

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Thermal creep analysis of noble metal alloys for the ceramic‐fused‐to‐metal technique

Fischer

Baltzer

Fleetwood

1999

J. Biomed. Mater. Res.

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Effects of firing cycle and surface finishing on distortion of metal ceramic castings

Cited by 46 publications

References 16 publications

Strain Gauge Analysis of the Effect of Porcelain Firing Simulation on the Prosthetic Misfit of Implant-Supported Frameworks

Strain Gauge Analysis of the Effect of Porcelain Firing Simulation on the Prosthetic Misfit of Implant-Supported Frameworks

Thermal creep analysis of noble metal alloys for the ceramic-fused-to-metal technique

Thermal creep analysis of noble metal alloys for the ceramic‐fused‐to‐metal technique

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