OBJECTIVE: The experiment is to test the inhibitory bacteria action of three commercial available calcium hydroxide (Hy-cal, Metapex, Metapaste) and 1%chitin on main bacteria from infected canal.

• 目的:研究3种氢氧化钙成品制剂(Hy-cal、Metapex、Metapaste)及1%25甲壳素对感染根管致病菌的抑制作用。