93 嵌體 (inlay) 窩洞修形時,下列何種鑽針最合適? (A) 圓型鑽針 (round bur) (B) 倒錐型鑽針 (inverted cone bur) (C) 錐型裂溝鑽針 (taper fissure bur) (D) 直型裂溝鑽針 (straight fissure bur)