Inner surface roughness of complete cast crowns made by centrifugal casting machines

Ogura, Hideo; Raptis, C.N.; Asgar, Kamal

doi:10.1016/0022-3913(81)90041-x

Cited by 21 publications

(9 citation statements)

References 4 publications

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“…4). The specimen's surface roughness was qualitatively evaluated with Scanning Electron Microscope [4,11,12]. The pictomicrographs were made with SEM at 9200 and 9500 magnifications (Figs.…”

Section: Measurement Of Marginal Discrepancymentioning

confidence: 99%

Investigation of Marginal Fit and Surface Roughness of Crowns, Due to Different Bench Set and Different Burnout Temperature Using Base Metal Alloy

Hasti

Patil

2010

J Indian Prosthodont Soc

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The conventional investing technique is used most commonly for casting. Inspite of the popularity of this technique, it is very time consuming. To save time of the patient, dentist and dental laboratory technician, accelerated casting technique can be used. This study uses different bench set and different burnout temperatures and has been carried to investigate their effects on marginal fit and surface roughness. A total of 40 wax patterns were made simulating the artificial crown from the first master die and 20 rectangular wax patterns were made from the second master die. Twenty castings simulating the crown and 10 castings of rectangular plates were obtained by short protocol represented as Group A and C, similarly the remaining castings were obtained by standard protocol and represented as Group B and D. Marginal discrepancy of both Group A and B were determined by using Travelling microscope, whereas Perthometer was used for quantitative evaluation of average surface roughness of both Group C and D. Scanning electron microscope evaluated the surface roughness qualitatively for the specimens of both Groups C and D. The obtained values of Group A and C and Group C and D were subjected to statistical analysis. Qualitative analysis of Group C and D were done. Accelerated/short protocol gives similar results in terms of marginal fit and surface roughness as compared to the conventional/standard protocol and is definitely a time saving procedure.

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Section: Measurement Of Marginal Discrepancymentioning

confidence: 99%

Investigation of Marginal Fit and Surface Roughness of Crowns, Due to Different Bench Set and Different Burnout Temperature Using Base Metal Alloy

Hasti

Patil

2010

J Indian Prosthodont Soc

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“…Previous studies suggested that numerous factors such as alloy type, location in the mold, the mold and casting temperatures, and sandblast method influence the surface condition of the castings 5,27) . In the present study, the mold temperatures at casting with QHM and CHM were according to the manufacturers' suggestions.…”

Section: Discussionmentioning

confidence: 99%

Titanium Casting Using Commercial Phosphate-bonded Investments with Quick Heating Method

Yan

Takahashi

2006

Dent. Mater. J.

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The purpose of this study was to investigate the possible use of quick heating method for titanium casting using two commercial investments(Rematitan Plus and Tancovest). The resulting characteristics of the investments with the quick heating method were as follows: residual thermal expansion at the casting temperature was in the range of 0.39 to 0.64％; green strength and fired strength ranged from 4.4 to 10.3 MPa and from 13.8 to 17.6 MPa, respectively. Five full crown titanium castings from each casting condition were obtained using an argon arc melting and gas pressure casting machine. The thickness of cast surface reaction layer was approximately 200μm, regardless of heating methods or investments. Further, the heating method did not significantly influence either the accuracy or surface roughness of the titanium castings. These results therefore suggested that these commercial investments for titanium could be used for the quick heating method.

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“…As regards granulometry, however, they differ: Heat Shock ® presents rougher particles, whereas Castotal ® has finer particles. The finer the particles of an investment, the smaller will be the surface irregularities of a casting 29,[32][33][34][35] . Therefore, it was not possible to completely accept the tested hypothesis.…”

Section: Analysis Of the Castingsmentioning

confidence: 99%

Influence of investment granulometry on the castability and surface roughness of castings obtained with Ni/Cr alloys

et al. 2009

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The aim of this study was to verify the influence of investment granulometry on the castability and surface roughness of Ni/Cr castings. Four investments were selected for casting according to decreasing order of granulometry: Heat Shock > Micro Fine 1700 > Gilvest HS > Castotal. Castability was verified by means of 40 specimens made with a polyester screen and determined from the number of segments completely filled by the cast alloy. To analyze the roughness, 40 disk-shaped wax patterns were made (15 x 3 mm), and after inclusion in the investments, they were cast and analyzed, before and after polishing (Mitutoyo SJ-201). The measurements were statistically analyzed (1-ANOVA -Tukey -p < 0.05) and it was verified that Heat Shock provided the worst castability with significant difference (p < 0.05) when compared with other investments. This material and Castotal presented similar roughness before and after polishing, with statistically significant difference (p < 0.05) between them and Gilvest and Micro Fine. It was concluded that investments with smaller granulometry provided castings that were more complete, but not smoother.

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Inner surface roughness of complete cast crowns made by centrifugal casting machines

Cited by 21 publications

References 4 publications

Investigation of Marginal Fit and Surface Roughness of Crowns, Due to Different Bench Set and Different Burnout Temperature Using Base Metal Alloy

Investigation of Marginal Fit and Surface Roughness of Crowns, Due to Different Bench Set and Different Burnout Temperature Using Base Metal Alloy

Titanium Casting Using Commercial Phosphate-bonded Investments with Quick Heating Method

Influence of investment granulometry on the castability and surface roughness of castings obtained with Ni/Cr alloys

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