49.當病患口內有陶瓷嵌體(ceramic inlays/onlays)復形物時，下列何種氟化物可以預防二次齲齒，且不會對陶瓷及牙齒造成不利影響？①acidulated phosphate fluoride solution ②stannous fluoride gel ③ neutral sodium fluoride solution (A)①②③ (B)僅② (C)僅③ (D)僅②③