Department of Pediatric and Preventive Dentistry, ITS-CDSR, Muradnagar, Uttar Pradesh, India.
J Indian Soc Pedod Prev Dent. 2023 Jul-Sep;41(3):253-257. doi: 10.4103/jisppd.jisppd_214_23.
Well articulated by John Knowles - "Everything has to evolve or else it perishes." With the paradigm shift of emphasis toward the prevention of dental caries, it has been proven that laser irradiation protects against both caries initiation and caries progression.
The aim of the study was to evaluate and compare the micromorphology of caries-free extracted premolars using a Scanning electron microscope (SEM) after fissurotomy by conventional fissurotomy bur and erbium, chromium: yttrium, scandium, gallium, and garnet (ER, CR: YSGG) hard-tissue laser.
Sixty caries-free premolars extracted atraumatically for orthodontic treatment were included in the study. The samples were divided into two groups randomly (Group 1: fissurotomy by bur, n = 30, and Group 2: fissurotomy by hard-tissue laser, n = 30). Each sample was further divided into halves from the occlusal surface wherein one-half of the occlusal surface received fissurotomy procedure and the other half was control. Samples were analyzed by scanning electron microscopy (SEM) for micromorphological changes.
Profile image of control samples revealed the disorganization of enamel surface at the junction of fissures forming a heterogeneous tissue and agglomeration of enamel with deep pit and fissure. On the contrary, the image of experimented samples (with laser fissurotomy) showed smooth enamel surface and homogeneous enamel subsurface with wider pit and fissure owing to self-cleansing ability.
On the grounds of the present study results, it could be concluded that the intervention of ER, CR: YSGG hard-tissue laser possesses self-cleansable pit and fissures for caries prevention and has the potential to irradicate the smear layer entirely for superior attachment of remineralizing agents.
约翰·诺尔斯（John Knowles）曾明确表示：“万物皆须进化，否则就会消亡。”随着人们对预防龋齿的重视，已经证明激光照射可以预防龋齿的发生和进展。
本研究旨在通过扫描电子显微镜（SEM）评估和比较使用传统牙裂钻和铒铬：钇钪石榴石（ER，CR：YSGG）硬组织激光进行窝沟封闭后无龋磨牙的微观形态。
本研究纳入了 60 颗因正畸治疗而无龋的离体磨牙。将样本随机分为两组（组 1：牙裂钻窝沟封闭，n = 30；组 2：硬组织激光窝沟封闭，n = 30）。每个样本从咬合面分为两半，其中一半的咬合面接受窝沟封闭程序，另一半为对照。使用扫描电子显微镜（SEM）对样本进行微观形态分析。
对照组样本的轮廓图像显示，在裂隙交界处的釉质表面出现紊乱，形成不均匀的组织，并出现釉质聚集体和深窝沟。相比之下，实验组（激光窝沟封闭）样本的图像显示出光滑的釉质表面和同质的釉质下表面，窝沟变宽，这归因于自洁能力。
根据本研究结果，可以得出结论，ER，CR：YSGG 硬组织激光干预具有自洁性的窝沟，可预防龋齿，并有可能完全清除玷污层，从而增强再矿化剂的附着。
