Nd:YAG激光去除根管内充填材料效果的研究  

Removal of filling materials from root canals using Nd: YAG laser irradiation

作　　者：陈幸哲 朱庆萍[1] 孙超[2] 吴大明[2] 周广超[2] 袁玲[3] 张宏超[3] 

机构地区：[1]南京医科大学口腔疾病研究江苏省重点实验室南京医科大学附属口腔医院特诊科,江苏南京210029 [2]南京医科大学口腔疾病研究江苏省重点实验室南京医科大学附属口腔医院放射科,江苏南京210029 [3]南京理工大学理学院,江苏南京210094

出　　处：《口腔医学》2016年第4期314-317,共4页Stomatology

基　　金：江苏省科学技术厅自然科学基金资助项目(BK2011695)

摘　　要：目的通过测定根管内充填材料的清除率和根管外壁温度的变化,评价不同功率Nd:YAG激光去除根管内充填材料的效果。方法选取临床拔除的40颗单根管离体上颌中切牙,常规镍钛锉根管预备、热牙胶充填根管后,随机均分为A、B、C实验组和D对照组,分别采用1.0,1.5,2.0 W的Nd:YAG激光及Protaper D3再治疗锉去除根管内充填材料,同时测量根管外壁的温度变化。各样本在处理前后分别采用mimics软件将口腔颌面锥形束CT(CBCT)的扫描数据进行处理,计算出实验前根管内充填材料体积、处理后剩余充填材料体积及根管充填材料清除率。结果 A、B、C、D四组根管充填材料清除率分别为80.49%、89.82%、78.09%、21.09%,除A组与C组比较无统计学差异外,其他组间两两比较均有统计学差异(P<0.05);A、B、C、D四组根管外壁温度升高均值分别为5.28、6.48、7.73、0.80℃,A、B、C组均与D组有统计学差异(P<0.05)。结论Nd:YAG激光能够有效去除根管内充填材料,参数设置为频率20 Hz,功率1.5 W,SP模式的Nd:YAG激光根管充填材料清除率高,根管外壁温度较再治疗锉明显升高,但在牙周可耐受范围以内。Objective To evaluate the effect of different power of Nd： YAG laser on the removal of root canal filling materials by measuring the removal percentage of root canal filling materials and the change of the temperature on the root surface. Methods 40 maxillary central incisors were prepared by Pro Taper rotary files and filled by Sybron Endo filling system. After that,40 teeth were randomly divided into four groups of 10 each,namely experimental groups A,B,C and control group D. Root canal filling materials of four groups were removed by 1. 0,1. 5,2. 0 W Nd： YAG laser and Pro Taper D3 respectively,and temperature changes on the root surface were also measured at the same time. The Mimics software was used to process the data of CBCT before and after treatment. The removal percentage of root canal filling materials was calculated. Results The average removal percentage of filling materials in group A,B,C and D was 80. 49%,89. 82%,78. 09%,21. 09%,respectively. There was significant difference within groups（ P〈0.05）,except for group A and C. Average temperature increase of group A,B,C and D were 5. 28,6. 48,7. 73,0. 80 ℃,respectively,with significant differences between experimental groups and control group（ P〈0. 05）. Conclusion Nd： YAG laser can effectively remove the root canal filling materials,the parameter of 20 Hz,1. 5 W,SP Nd： YAG laser（ group B） has a high removal percentage,and the temperature increase on the root surface is within the tolerance range of periodontium.

关 键 词：ND:YAG激光 Protaper再治疗锉 根管再治疗 

分 类 号：R781.05[医药卫生—口腔医学]