Jhingan Pulkit, Sandhu Meera, Jindal Garima, Goel Deepti, Sachdev Vinod
Department of Pedodotnics and Preventive Dentistry, ITS - CDSR, Muradnagar, Ghaziabad, (U.P.), India.
Indian J Dent. 2015 Apr-Jun;6(2):85-90. doi: 10.4103/0975-962X.155889.
Very recently, diode laser has been used for disinfecting the root canals in endodontic treatment and increasing its success rate and longevity utilizing the thermal effect of laser on surrounding tissues.
The aim of this study is to evaluate the effect of 980 nm laser irradiation on intra-canal dentin surface - scanning electron microscopic (SEM) - in-vitro study.
A total of 40 single-rooted freshly extracted permanent teeth were collected. Teeth were sectioned at the cemento-enamel junction using diamond disc. Root canals of all samples were prepared using hand ProTaper, which were randomly assigned into two groups (n = 20 each). Group 1: Receiving no treatment after biomechanical preparation; Group 2: 980 nm diode laser-treated root canals. Teeth were prepared for SEM analysis to check the size of intra-canal dentinal tubule openings.
Data were analyzed using SPSS V.16 software and compared using Levene's and independent t-test.
On statistical analysis, width of intracanal dentinal tubule openings in Group 1 (control) was significantly higher than those observed in Group 2 (diode laser-treated) (P < 0.001).
This study showed that the application of 980 nm diode laser on intra-radicular dentin resulted in ultrastructural alterations resulting in melting of dentin.
最近，二极管激光已被用于牙髓病治疗中的根管消毒，并利用激光对周围组织的热效应提高其成功率和使用寿命。
本研究的目的是通过扫描电子显微镜（SEM）体外研究评估980nm激光照射对根管内牙本质表面的影响。
共收集40颗新鲜拔除的单根恒牙。使用金刚石圆盘在牙骨质-釉质界处将牙齿切开。所有样本的根管均使用手动ProTaper进行预备，然后随机分为两组（每组n = 20）。第1组：在进行生物力学预备后不接受任何处理；第2组：980nm二极管激光处理根管。对牙齿进行SEM分析准备，以检查根管内牙本质小管开口的大小。
使用SPSS V.16软件对数据进行分析，并使用Levene检验和独立样本t检验进行比较。
经统计分析，第1组（对照组）根管内牙本质小管开口的宽度明显高于第2组（二极管激光处理组）（P < 0.001）。
本研究表明，980nm二极管激光应用于根管内牙本质会导致超微结构改变，从而使牙本质熔化。
