Abstract
The release of metal ions in vivo is often accompanied by allergic reactions. Therefore, it is desirable to use the same metal in the oral cavity because of electrochemistry. With this in mind,titanium was recommended, as an implant as well as for a prosthesis. Normally, a prosthesis is made by casting. This study was conducted to investigate the relationship between the spark erosion system and the prosthesis of titanium. The results were as follows:
1.There was no difference between the hardness of the titanium crown made by the spark erosion system and that of the titanium ingot.
2. Through observation, the structure of the titanium crown made by a spark erosion system was the same as the structure of the titanium ingot.
3.The titanium crown made by a spark erosion system was considered to be a clinically viable option.
