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The study about the marginal fit of the casting titanium and machine-milled titanium copings 주조티타늄과 기계절삭티타늄 코핑의 변연적합성에 관한 연구
Su-Yeon Oh, Mong-Sook Vang, Hong-So Yang, Sang-Won Park, Ha-Ok Park
오수연, 방몽숙, 양홍서, 박상원, 박하옥

Statement of problem: The titanium has advantages of a high biocompatibility, a corrosion
resistence, low density, and cheep price, so it is focused as a substituted alloy. But it is quite dif-
ficult to cast with the tranditional method due to the high melting point, reacivity with element
at elevated temperature.
By using the CAD-CAM system for the crown construction, it is possible to reduce the errors
while proceeding the wax-up, investing, and casting procedure
Purpose: The purposes of this study were to measure the marginal adaptation of the casting
titanium coping and machine-milled titanium coping according to the casting methods and the
marginal configurations.   
Material  and method: The marginal  configurations were  used  chamfer,  shoulder,and
beveled shoulder. The total 30 copings were used, and these are divided into 6 groups according
to the manufacturing method and marginal configuration. The gap between margin of the mod-
el and the restoration was measured with 3-dimensional measuring microscope.
Results: The following results were obtained;
1. casting gold coping demonstrated the best marginal seal, followed by casting titanium cop-
ing finally machine-milled titanium copings.
2. In casting titanium coping, chamfer demonstrated the best marginal seal, followed by shoul-
der and beveled shoulder. There was no significantly difference in shoulder and beveled shoul-
der. But all margin form has clinically acceptable
3. In machine-milled titanium copings, chamfer demonstrated the best marginal seal, followed
by shoulder and beveled shoulder. Beveled shoulder show large and uneven marginal gap.
Conclusions: Above result revealed that marginal adaptation of the titanim coping is avail-
able in the clinical range, it can be used as an alternative metal and it is prefered especially in
chamfer or shoulder margin during implant superstructure fabrication. But there should be more
research on machine-milled titanium in order to use it in the clinics.

* Keywords: Titanium, Casting, Machine-milled, Marginal Fit

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