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瓷牙賤金屬結合力機轉之研究-金屬表面粗糙度和顯微結構之研究(V)

The Shear Bond Strength of Porcelain and Base metal Alloys for Metal – Ceramic Crown-the Study of Metal Roughness and Microstructure

摘要


瓷牙金屬冠已廣泛使用於牙科贋復物,賤金屬因硬度強並具有抗張力及良好彈性係數,含斂點金流動性好易於鑄造外又可影響金屬表面之氧化層及金屬與瓷層間的結合強度。金屬表面之處理及研磨材料會影響瓷層與金屬間的結合力。本實驗使用二種賤金屬,一種含鈹合金Rexillium III和另一種不含鈹點金Wiron88。試片使用五種不同研磨器材50μm三氧化二鋁噴砂,100μm三氧化二鋁噴砂,碳鋼磨針,碳化矽錐和切片研磨,爾後利用表面粗糙度測量儀MTS-501探測研磨後合金表面粗糙度,再以掃描式電子顯微鏡觀察研磨後合金表面顯微結構。 其結果如下: 1.兩種合金經五種研磨材研磨後,表面粗糙度最大的是50μm三氧化二鋁噴砂。就合金Rexillium III表面粗糙度Ra值是4.46μm,合金Wiron 88 是4.20μm。最小的是用碳鋼磨針研磨,就合金Rexillium III表面粗糙度Ra值是1.64μm,合金Wiron 88是2.43μm。 2.五種研磨材研磨合金表面各有特定顯微表面結構組織,臨床操作上應小心選擇研磨器具,沒有一種處理方式能適合所有賤金屬。 3.以50μm和100μm三氧化二鋁噴砂的表面結構相似,兩者皆有明顯的倒凹區多且明顯。 4.用碳鋼磨針研磨後,其差面較無倒凹區且平滑。 5.用切片和碳化矽錐研磨後,其表面有許多鋸齒狀的撕裂面且有殘雜質,表面亦有明顯的剝落現象。 6.合金Wiron 88的表面常有皺摺的線紋,而合金Rexillium III則無此現象。 瓷牙金屬冠已廣泛使用於牙科贋復物,賤金屬因硬度強並具有抗張力及良好彈性係數,含斂點金流動性好易於鑄造外又可影響金屬表面之氧化層及金屬與瓷層間的結合強度。金屬表面之處理及研磨材料會影響瓷層與金屬間的結合力。本實驗使用二種賤金屬,一種含鈹合金Rexillium III和另一種不含鈹點金Wiron88。試片使用五種不同研磨器材50μm三氧化二鋁噴砂,100μm三氧化二鋁噴砂,碳鋼磨針,碳化矽錐和切片研磨,爾後利用表面粗糙度測量儀MTS-501探測研磨後合金表面粗糙度,再以掃描式電子顯微鏡觀察研磨後合金表面顯微結構。 其結果如下: 1.兩種合金經五種研磨材研磨後,表面粗糙度最大的是50μm三氧化二鋁噴砂。就合金Rexillium III表面粗糙度Ra值是4.46μm,合金Wiron 88 是4.20μm。最小的是用碳鋼磨針研磨,就合金Rexillium III表面粗糙度Ra值是1.64μm,合金Wiron 88是2.43μm。 2.五種研磨材研磨合金表面各有特定顯微表面結構組織,臨床操作上應小心選擇研磨器具,沒有一種處理方式能適合所有賤金屬。 3.以50μm和100μm三氧化二鋁噴砂的表面結構相似,兩者皆有明顯的倒凹區多且明顯。 4.用碳鋼磨針研磨後,其差面較無倒凹區且平滑。 5.用切片和碳化矽錐研磨後,其表面有許多鋸齒狀的撕裂面且有殘雜質,表面亦有明顯的剝落現象。 6.合金Wiron 88的表面常有皺摺的線紋,而合金Rexillium III則無此現象。

關鍵字

無資料

並列摘要


The metal-ceramic crown has become a predominant restoration in fixed prosthodontics. The base metal has the quality of lower price, high tensile strength, high elastic modulus. The base metal alloy that contain beryllium element increases fluidity and improved casting performance. Beryllium also controls surface oxidation and affects the metal ceramic bonds. Preparation of surface prior to porcelain bonding has been a subject of controversy among dental ceramists. Two ceramic base metal alloys (one alloy contains beryllium, another is not) were studied. This investigation evaluated the polishing effects of 50μm, l00μm aluminum oxide sandblasting, carbide bur, carborundum point and separating disk upon two base metal alloys, Rexillium III and Wiron 88. A scanning electron microscope was used to study the surface texture. The following results were obtained: 1. The most roughest surface was created with 50μm aluminum oxide sandblasting. The carbide bur produced the least roughed surface. 2. There are specific surface texture patterns after polishing with five different grinding materials. 3. The metal surfaces treated with 50μm and l0μm aluminum oxide have same micro- structure pictures, but there are much more undercuts treated with 100μm aluminum oxide. 4. The usage of carbide bur resulted in less undercuts of metal surface at two metal alloys. 5. The usage of carborundum point and disk resulted in abrasive particles that retained on the grinding metal surface at two metal alloys. 6. The surface of Wiron 88 alloy usually had wrinkle texture but not the Rexillium III alloy.

並列關鍵字

base metal surface roughness microstructure

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