49 下列那種齒頸部邊緣形態最適合製作瓷融合金屬冠(porcelain fused to metal crown)的瓷側邊緣(porcelain margin)?(A)刀緣(knife edge) (
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49 下列那種齒頸部邊緣形態最適合製作瓷融合金屬冠(porcelain fused to metal crown)的瓷側邊緣(porcelain margin)? (A)刀緣(knife edge) (B)肩台緣(shoulder) (C)羽毛緣(feather edge) (D)斜面肩台緣(shoulder with bevel)