在根面平整后,根面上会遗留污染层。以往学者采用化学方法去除,如采用枸橼酸、EDTA和过氧化氢等。CO_2激光因比其它激光引起的牙髓损伤小,故作者采用CO_2激光去除根面平整术后根面上的污染层,评价并与各种化学制剂作比较。 采用拔除的50只牙周病患牙,邻近根面经刮治、平整后,35只患牙根面用3 W低功率的CO_2激光照射,依照射时间不同分7组。余15只患牙均分3组,分别用枸橼酸、EDTA和6％过氧化氢液涂擦处理根面,每次涂擦时间为3min。全部标本经SEM After the root surface is flat, the root surface will leave pollution. Scholars in the past using chemical methods to remove, such as the use of citric acid, EDTA and hydrogen peroxide and so on. CO 2 laser is less damaged than other laser-induced dental pulp. Therefore, the authors used CO 2 laser to remove the contaminated layer on the root surface after root-surface flattening, and evaluated and compared with various chemical agents. Fifty teeth with periodontal disease were removed. The adjacent root surface was treated by scraping and flattening. 35 teeth were irradiated with 3 W low-power CO 2 laser, and the irradiation time was divided into 7 groups. More than 15 teeth were divided into three groups were treated with citric acid, EDTA and 6% hydrogen peroxide solution rubbed the root surface, each rubbing time of 3min. All specimens by SEM