| Summary: | 碩士 === 高雄醫學大學 === 牙醫學研究所 === 82 === Two different kinds of dental ceramic alloys were used in this study. The one is a palladium-copper alloy (Option, Ney, CT, USA), the other is a palladium-silver alloy (JP-5, Jensen, CT, USA). The centrifugal casting machine and the argon vaccum casting machine were operated seperatelly. The specimens were devided into two groups. Group A is recasting without new alloy added. Group B is recasting with 50% new alloy added. Both group A and B of the alloys were recast to the fifth time. Then, the castability on the recasting of these two dental creamic alloy were evaluated.
The results are:
1. The average results of the castability:
(1) From the centrifugal casting machine
a. In JP-5 alloy:
Group A, from the initiation to the forth generation, were 70.77 ±7.34%, 82.56 ±8.51%, 92.05 ±4.70%, 98.97 ±1.18%, 71.53 ±9.23%
Group B, from the initiation to the forth generation, were 80.25 ±6.98%, 87.43 ±12.53%, 98.72 ±1.18%, 93.33 ±3.21%, 74.87 ±7.70%
b. In Option alloy:
Group A, from the initiation to the forth generation, were 81.80 ±2.70%, 96.15 ±4.29%, 98.20 ±1.94%, 100.0 ±0%, 94.10 ±3.47%
Group B, from the initiation to the forth generation, were 98.97 ±1.78%, 97.43 ±2.35%, 96.66 ±0.44%, 100.0 ±0%, 98.20 ±2.48%
(2) From the argon vaccum casting machine
a. In JP-5 alloy:
Group A, from the initiation to the forth generation, were 70.51 ±6.63%, 87.17 ±11.95%, 97.95 ±3.56%, 94.61 ±4.69%, 80.25 ±11.83%
Group B, from the initiation to the forth gerenration, were 80.51 ±3.63%, 98.72 ±1.60%, 96.41 ±3.47%, 92.30 ±7.70%, 79.48 ±15.5%
b. In Option alloy:
Group A, from the initiation to the forth generation, were 67.17 ±9.5%, 79.74 ±18.24%, 52.56 ±27.19%, 91.79 ±12.90%, 79.23 ±8.14%
Group B, from the the initiation to the forth generation, were 85.13 ±12.36%, 94.36 ±5.12%, 88.20 ±10.25%, 90.25 ±11.42%, 83.59 ±10.33%
2. The castability of both the Pd-Cu and the Pd-Ag alloy became better after recast, especially the first, second and the third generation. The castability of the initiation and the 4th generation were worse than the 1st, 2nd & 3rd generation, there's no significant difference between them.
3. The argon castability of both alloys from the vaccum casting machine were not better than those from the centrifugal casting machine. There is no significant difference between the two casting methods.
4. In the same generation, there's no significant difference between the Pd-Cu and the Pd-Ag ceramic alloy.
5. In the same casting method, the same generation of the same group, of the different alloy, there's also not significant difference between the two alloys.
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