鎳基合金與燒附陶瓷技術的整合性製程研發

Abstract

烤瓷牙是近幾年才開展的一種高科技的鑲牙方法，是在治療的牙根上用高強度合金做成金屬帽，在其表面烤上一層與天然牙色澤相近的瓷粉，最後粘結於牙齒上。製作烤瓷牙是個步驟繁多的工藝，極高溫、鑄造、粘結等技術結為一體的高科技產品。製作一個成功的合金瓷冠補綴物，美觀及合金瓷層間堅強的結合力是牙醫臨床家與技工所追求的兩大目標。成功的合金瓷冠補綴物取決於：□燒成溫度的效果□合金與瓷層界面組織的結合相□合金的種類與特性，其中又以金屬與瓷層的結合最為重要。 此實驗以鎳基合金為研究材料，基礎合金中鎳基合金因其價格低廉、抗腐蝕性佳、高強度及剛性、低密度等因素，對於取代價格昂貴的傳統合金，鎳鉻合金是一良好替代物。為了使其瓷層與合金間有良好的結合力，將鎳基合金以陽極氧化(anodization)的方式作為表面處理，陽極氧化處理主要為增加鎳基合金之氧化層厚度與表面粗糙度，改善鎳基合金與瓷層間之化學鍵結(Chemical Bonding)與機械鍵結(Mechanical Bonding)，使瓷層不易崩潰，進而改善其耐用度。

Porcelain-Fused-to-Metal Crown (PFM) is a new high technique in denture teeth. It is a metal alloy and ceramics compound fixture, as formed by ceramic sintering. PFM is a complex and high technique. This fabrication includes many steps such as high temperature casting, sintering, and annealing adhesion. The key technique is the binding strength of alloy and ceramics. It is also the concern and purpose for doctors and engineers. The key to fabricate Porcelain-Fused-to-Metal Crown is related with sintering temperature, interface interaction of metal and ceramics, and alloy properties. Among these, the adhesion capability between alloys and ceramics is the most important factor. In the development, nickel-based alloy will be used to fabricated PFM. Nickel-based alloy possesses low cost, well resistance to corrosion, high strength and rigidity, and low density, etc. It is cheap alloy and the best selection to replace the conventional alloys. In order to promote the binding capability of metal and ceramics, anodization treatment is performed on nickel-based alloys. Increasing the thickness of oxidation and surface roughness is to improve chemical and mechanical bonding. It is believed that thickness of oxidation and surface roughness are able to promote the adhesion properties of PSM.