4-META and new phosphate-methacrylate resins adhere strongly to dental alloys. However, for strengthening the water durability of the adhesive interface, the oxidation of the alloy surface is indispensable. A new oxidation method using ion-sputtering was developed, and the effectiveness of this surface treatment on two dental alloys--a type IV gold alloy and Ni-Cr-Be alloy--was investigated. As an endurance test, thermocycling for a maximum of 100,000 cycles was adopted, and the tensile adhesive bond strength was then measured. Ion-coating the surface of the alloys resulted in strong bonds with adhesive resins, and after 100,000 thermocycles, a bond strength of above 20 MPa was maintained.

Abstract:Ion sputtering is a phenomenon in which ions or other high energy particles strike at a target electrode causing emission of atoms from the electrode. It takes placein a grow discharge in a relatively low vacuum chamber. We studied the application of this phenomenon to surface treatment of dental precious alloys for adhesion.Nine pure metals were examined the aptitude as a target which was the source of metal oxide supply. As the result of adhesion endurance test, Cu target showed favorableadhesive strength, and following studies were conducted applying Cu target. In the next study to decide the optimum ion coating time, best result was obtained by 10 minutes treatment.Type IV and Au-Ag-Pd alloys ion coated for 10 minutes with Cu target showed excellent adhesive durability in endurance test and after subjection to thermal cycling of 50,000 times, adhesive strength of above 250 kgf/cm2 were maintained. Ion sputtering is a phenomenon in which ions or other high energy particles strike at a target electrode causing emission of atoms from the electrode. It takes place in a grow discharge in a relatively low vacuum chamber. We studied the application of this phenomenon to surface treatment of dental precious alloys for adhesion.Nine pure metals were examined the aptitude as a target which was the source of metal oxide supply. As the result of adhesion endurance test, Cu target showed favorable adhesive strength, and following studies were conducted applying Cu target. In the next study to decide the optimum ion coating time, best result was obtained by 10 minutes treatment.Type IV and Au-Ag-Pd alloys ion coated for 10 minutes with Cu target showed excellent adhesive durability in endurance test and after subjection to thermal cycling of 50,000 times, adhesive strength of above 250 kgf/cm2 were maintained.

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