ISSN:
1532-849X
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Medizin
Notizen:
The aim of this study was to assess distortion inherent in casting, soldering, and simulated porcelain firings of screw-retained, implant-supported three-unit fixed partial dentures (FPDs).〈section xml:id="abs1-2"〉〈title type="main"〉Materials and MethodsTen wax patterns were fabricated on a die-stone cast containing two implants, 20 mm apart from center to center. Five specimens were cast in a high-palladium alloy, exposed to simulated porcelain firings, sectioned, and then soldered with low-fusing solder. Five specimens were cast, sectioned, soldered with high-fusing solder, and then exposed to simulated porcelain firings. For each specimen, two horizontal and six vertical distances between appropriately scribed reference points were measured with a traveling microscope. Comparisons were made among the various measurements taken after wax-pattern fabrication, casting, high- and low-fusing soldering, and each porcelain firing. Data were analyzed using a repeated-measures factorial ANOVA (α= 0.05).〈section xml:id="abs1-3"〉〈title type="main"〉ResultsSignificant difference was detected in the amount of horizontal distortion during casting (53 ± 24 μm) and high-fusing soldering (−49 ± 50 μm), as well as in the amount of horizontal distortion during high-fusing soldering (−49 ± 50 μm) and low-fusing soldering (17 ± 26 μm). However, no clinically significant difference was found in the amount of horizontal distortion during casting, low-fusing, and high-fusing soldering. The greatest amount of distortion during the simulated porcelain firings took place during the oxidizing cycle.〈section xml:id="abs1-4"〉〈title type="main"〉ConclusionsSoldering did not improve the casting misfit of a three-unit implant-retained FPD model. Metal-ceramic implant frameworks should be oxidized before intraoral fit evaluation.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1532-849X.1999.tb00032.x
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