[A study for non-asbestos casting liners. An experimental study of the adaptability of MOD casting to die]

Asbestos liners for investment metal casting has frequently been used in dental laboratory work. In recent years, the dangerous properties of asbestos to the human body were reported in Europe and the United States, and casting liners without asbestos were developed and marketed by many manufacturers. These are so-called non-asbestos liners. This study evaluated the adaptability of MOD inlay castings to dies using 8 kinds of commercial non-asbestos liners of ADA standard No. 2 specifications. The results were as follows; Single and double layers of Casting ribbon, New Asbestos Ribon, Shofu experimental, and KAOLIN showed good adaptation. Shofu experimental with a single layer showed the best marginal adaptation (10 microns). OVAL LINERS and CASTING LINERS with single layer showed good adaptation, but with double layers the adaptation was poor. In FLASK LINER, the double layer showed better adaptation than that with a single layer. Most non-asbestos liners used in this study are adequate in useful to MOD inlay castings.