Development of Casting Investment Preventing Blackening of Noble Metal Alloys Part 2. Application of Developed Investment for Type 4 Gold Alloy

Nakai, Akira; Kakuta, Kiyoshi; Goto, Shinichi; Kato, Katuma; Yara, Atushi; Ogura, Hideo

doi:10.4012/dmj.22.321

Cited by 11 publications

(9 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a previous study 1) , it was reported that the addition of either boron (B) or aluminum (Al) particles to a commercially available gypsum-bonded investment was effective in preventing the blackening of as-cast surfaces of AgPd-Cu-Au alloys. Furthermore, in another study, the same effect was also found on Type 4 gold alloy 2) . The efficaciousness of boron and aluminum could be attributed to two reasons.…”

Section: Introductionsupporting

confidence: 53%

“…Cast specimen was removed from the mold, and the cast surface was cleaned in water for about five minutes using an ultrasonic cleaner until Development of Casting Investment Preventing Blackening of Noble Metal Alloys. Part 4: Effect of Mg(OH) 2 and Ca(OH) 2 as Additives the investment was sufficiently removed from the surface. Six specimens were prepared for the control specimens using the original investment (0 mass％), whereas three as-cast specimens and three polished specimens (using #1,000 SiC paper) were prepared from the six specimens.…”

Section: Color Evaluation Of Cast Specimensmentioning

confidence: 99%

“…Lower number is the content rate (mass％) of each additive in the investment. value (22.9) was obtained from the investment containing 10 mass％ Mg(OH) 2 . Result of two-way analysis of variance showed that differences in dE* between Ca(OH) 2 and Mg(OH) 2 addition at each varying content level were not significant.…”

Section: Thermogravimetric-differential Thermal Analysis (Tg-dta) Andmentioning

confidence: 99%

“…value (22.9) was obtained from the investment containing 10 mass％ Mg(OH) 2 . Result of two-way analysis of variance showed that differences in dE* between Ca(OH) 2 and Mg(OH) 2 addition at each varying content level were not significant. However, significant differences were found among the additive contents for each additive (p<0.01).…”

Section: Thermogravimetric-differential Thermal Analysis (Tg-dta) Andmentioning

confidence: 99%

“…These additives were individually added to a commercially availablegypsum-bonded investment (Cristobalite Micro II, GC Corp., Tokyo, Japan). The content of Ca(OH) 2 or Mg(OH) 2 in the experimental investment powder ranged from 2 to 10 mass％ at an interval of 2 mass％ respectively.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Development of Casting Investment Preventing Blackening of Noble Metal Alloys. Part 4: Effect of Mg(OH)2 and Ca(OH)2 as Additives

Nakai

Ogura

2007

Dent. Mater. J.

Self Cite

View full text Add to dashboard Cite

The objective of this study was to develop a casting investment that prevents the blackening of the cast surface of noble metal alloys. Experimental investments were prepared using a gypsum-bonded investment in which a hydroxide, namely Mg(OH) 2 or Ca(OH) 2 , was added. An Ag-Pd-Cu-Au alloy was cast into the mold made of the prepared investment. The addition of both hydroxides showed a significant effect on the color of as-cast surfaces, which was improved with increase in additive content. When Mg(OH) 2 or Ca(OH) 2 was added at more than 4.0 mass% to the investment, it was useful in preventing the blackening of the as-cast surfaces of an Ag-Pd-Cu-Au alloy. As for differences in the effects between Mg(OH) 2 and Ca(OH) 2 , they were not found.

show abstract

Section: Introductionsupporting

confidence: 53%

Section: Color Evaluation Of Cast Specimensmentioning

confidence: 99%