Subramanian Saravana Kumar, Anbarasu Prema, Joushua R S, Jeyaraj Yamini, Iyer Sushmitha R, Bhaskar Nivethitha
Department of Orthodontics, Chettinad Dental College and Research Institute, Kelambakkam, Tamil Nadu, India.
J Orthod Sci. 2022 Jan 28;11:6. doi: 10.4103/jos.jos_129_21. eCollection 2022.
Laser etching addresses the disadvantages of conventional acid etching technique, such as enamel decalcification and formation of white spot lesions. The aim of the present study was to evaluate and compare the shear bond strength (SBS), adhesive remnant index (ARI), and the surface characteristics of the samples treated with conventional acid etching and Er, Cr: YSGG laser etching with variable output power and time durations.
The study sample included 78 extracted teeth divided into six groups of 13 teeth each, and 3 samples from each group were utilized for analyzing etch patterns, and the remaining 10 teeth from each group were used for evaluating the shear bond strength. In Group I phosphoric acid etching was done, whereas in Group II- VI Laser etching 1.5 W/10 s, 1.5 W/15 s, 3 W/5 s, 3 W/10 s, 3 W/15 s. Statistical analysis for shear bond strength testing was performed using one-way ANOVA followed by Post HOC tests.
The mean shear bond strength of Group I was 7.16 Mpa and Group III of 5.43 Mpa. Group II, IV, V, and VI had mean shear bond strength of 4.93 Mpa, 3.88 Mpa, 4.05 Mpa, and 4.88 Mpa, respectively. The ARI scores Group I had a significant number of samples with scores 2 other groups showed increased Score 0. The etch pattern of groups I, II, III showed the combined dissolution of both prism cores, and peripheries were seen. In group IV, the etching pattern was irregular with the pitted type of surface. In groups V and VI, relatively flat and smooth enamel surface was seen.
The bond strength attained by laser etching (1.5 W/10 s and 1.5 W/15 s) was comparable to that obtained by the acid etching technique.
激光蚀刻解决了传统酸蚀技术的缺点，如牙釉质脱矿和白斑病变的形成。本研究的目的是评估和比较传统酸蚀与不同输出功率和持续时间的铒铬：钇铝石榴石激光蚀刻处理的样本的剪切粘结强度（SBS）、粘结剂残留指数（ARI）和表面特性。
研究样本包括78颗拔除的牙齿，分为六组，每组13颗牙齿，每组3个样本用于分析蚀刻模式，每组其余10颗牙齿用于评估剪切粘结强度。第一组进行磷酸蚀刻，而第二组至第六组进行激光蚀刻，功率分别为1.5W/10秒、1.5W/15秒、3W/5秒、3W/10秒、3W/15秒。使用单因素方差分析进行剪切粘结强度测试的统计分析，随后进行事后检验。
第一组的平均剪切粘结强度为7.16兆帕，第三组为5.43兆帕。第二组、第四组、第五组和第六组的平均剪切粘结强度分别为4.93兆帕、3.88兆帕、4.05兆帕和4.88兆帕。ARI评分中，第一组有大量样本评分为2，其他组评分为0的样本数量增加。第一组、第二组、第三组的蚀刻模式显示棱柱核心和周边均有溶解。第四组的蚀刻模式不规则，表面呈麻点状。在第五组和第六组中，可见相对平坦光滑的牙釉质表面。
激光蚀刻（1.5W/10秒和1.5W/15秒）获得的粘结强度与酸蚀技术相当。
