• 대한치과보철학회지
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• 제35권1호
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• pp.103-117
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• 1997

The purpose of this experiment was to determind whether the gold electrodeposit on Pd-Ag and Ni-Cr alloys influences on the shear bond strength between veneering resin and silicoated metal surface. All the metal specimens were sandblasted with $250{\mu}m$ aluminum oxide and followed by silicoating and resin veneering. According to the metal surfaces to be veneered, experimental groups were divided into five. Group Prec : Gold alloy without gold coating Group Semi : Pd-Ag alloy without gold coating Group Base : Ni-Cr alloy without gold coating Group Semi-G : Pd-Ag alloy with gold coating Group Base-G : Ni-Cr alloy with gold coating All specimens were thermocycled 1,000 times at temperature of $5^{\circ}C$ to $55^{\circ}C$. The effects of gold electrodeposit on the shear bond strength between resin and metal interface were measured and fractured surface of the resin veneered metal was examined under the scaning electron microscope. The following results were obtained 1. The shear bond strength between resin and metal was $64.51{\pm}11.11Kg/cm^2$ in Prec group, $62.77{\pm}11.23Kg/cm^2$ in Base group and $58.97{\pm}9.20Kg/cm^2$ in Semi Group. There was no significant difference among the groups. 2. The bond strength in groups Semi-G and Base-G decreased about 17%, compared to the nongold-electrodeposit groups(Semi, Base). 3. In groups of non electrodeposit(Prec, Semi, Base), fracture occurred at the interface between alloy and resin, while fracture interface was observed between gold coating and resin in group Semi-G, and between metal substrate and gold coating in group Base-G respectively.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1993년도 춘계학술발표회
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• pp.32-32
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• 1993

• 대한치과보철학회지
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• 제33권4호
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• pp.645-661
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• 1995

As the mechanical property of composite resin improved, composite resin has been widely used esthetic dentistry. In the field of esthetic dentistry, the color of prosthetic material is very important. The purpose of this study was to evaluate the color difference of specimens, by the types of alloys and gold electrodeposit. Experimental groups were as follows : Group Prec : Au-Pt alloy with no gold coating and no resin veneer. Group Semi : Pd-Ag alloy with no gold coating and no resin veneer. Group BAse : Ni-Cr alloy with no gold coating and no resin veneer. Group Gsem : Pd-Ag alloy with no gold coating and no resin veneer. Group Gbas : Ni-Cr alloy with no gold coating and no resin veneer. Group PreR : Resin veneer on the Pd-Ag alloy without gold coating. Group SemR : Resin veneer on the Pd-Ag alloy without gold coating. Group GbsR : Resin veneer on the Ni-Cr alloy with gold coating Group BasR : Resin veneer on the Ni-Cr alloy without gold coating. In this study, colors of metal surfaces and veneered resins were evaluated by the CIE $L^{*}a^{*}b$ system. The results obtained were as follows : 1. different alloy types and gold coating make the $L^{*}a^{*}b$ system. 2. The ${\Delta}E^*$ab value between groups semi and Base was less than 1.5 and there was no $a^*$ and $b^*$ value difference between groups Gsem and Gbas 3. The values of $L^*$ and $a^*$ ain groups GsemR and GbasR were so similar that the ${\Delta}E^*$ab value was as small as 0.58. 4. In resin specimens with gold coated semiprecious or base alloys showed yellower and redder deviation than the resin specimens with precious alloy. 5. The ${\Delta}E^*$ab values between goups PreR-GsemR and groups PreR-GbasR were as small as 2.68 and 2.22 respectively.

• 한국재료학회지
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• 제5권6호
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• pp.673-681
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• 1995

아황산금나트륨염을 이용하여 형성된 약 20$\mu\textrm{m}$ 금도금층의 표면형상 및 우선적 결정 성장 방향에 대하여 전류밀도, 온도, 농도, pH, 교만속도, 금이온농도가 미치는 영향에 대하여 연구하였다. 표면형상은 cathode 근처의 금이온농도가 증가하는 조건[전류밀도(13.0mA/$\textrm{cm}^2$2$\longrightarrow$4.6mA/$\textrm{cm}^2$)], 온도 (3$0^{\circ}C$$\longrightarrow$6$0^{\circ}C$), pH(12.0$\longrightarrow$9.0), 교반효과(Orpm$\longrightarrow$3200rpm), 금이온농도(10g /1$\longrightarrow$l4g/1)으로 갈수록 porous한 조직에서 미세한 조직으로의 변화가 관찰되었다. X선분석에 의하면 금도금층의 결정성장의 주방향은 표면형상과 밀접한 관계를 나타내었으며 표면형상이 미세화되는 조건인 전류밀도(13.0$\longrightarrow$14.6mA/$\textrm{cm}^2$), pH(12.0$\longrightarrow$9.0)는 감소 할수록, 온도(3$0^{\circ}C$$\longrightarrow$6$0^{\circ}C$), 교반속도(0rPm$\longrightarrow$3200rpm), 금이온농도(10g/1$\longrightarrow$g/1)]는 증가 할수록 결정성장의 주회절피크는 (111)에서 (220)으로 그 성장면이 변하고 있음이 조사되었다.