Researcher assistant, Orthodontics and Pediatric Dentistry Department, National Research Centre, Egypt.
Professor and head, Orthodontics and Pediatric Dentistry Department, National Research Centre, Egypt.
Can J Dent Hyg. 2023 Feb 1;57(1):25-32. eCollection 2023 Feb.
Acidulated phosphate fluoride (APF) application is used for dental caries prevention. Combining APF with different laser wavelengths increases acid resistance in enamel.
To assess the effects of Er:YAG (2940 nm) laser and diode (940 nm) laser after the application of APF on morphology and mineral content of enamel surfaces of human teeth in vitro.
Twenty (20) freshly extracted third molar crowns were collected and split longitudinally into halves. Ten (10) halves were given to each of the following groups: group 1 (control), group 2 (application of 1.23% APF gel only), group 3 (diode laser; 1 W for 60 sec, contact mode after APF gel), and group 4 (Er:YAG; 80 mJ, 0.8 W, 10 Hz; in pulsed mode for 10 sec after APF gel). Specimens were morphologically examined by scanning electron microscope (SEM), and mineral content was analysed by energy dispersive X-ray (EDX). Collected data were statistically analysed by ANOVA.
Morphologic results were superior in group 3 followed by group 2 and group 1 with the least change in group 4. EDX of calcium (Ca), phosphorous (P), and Ca/P ratio weight % showed the highest value with no statistical significance between groups 2 and 1, and higher with statistical significance in groups 3 and 4 in descending order. Carbon weight % showed highest results in group 4 then 3, 2, and 1. Fluoride weight % showed highest statistical results in group 4 then 2, 3, and 1.
The diode laser showed superior morphological results after APF application compared to the Er:YAG laser. The Er:YAG increased fluoride absorption on outer enamel surfaces.
酸蚀磷酸氟化物（APF）应用于预防龋齿。将 APF 与不同的激光波长结合使用可以提高牙釉质的耐酸性。
评估 Er:YAG（2940nm）激光和二极管（940nm）激光在 APF 应用后对人离体牙釉质表面形貌和矿物质含量的影响。
收集 20 颗新鲜拔除的第三磨牙冠并纵向分为两半。将其中 10 个半部分分别分配给以下各组：第 1 组（对照组）、第 2 组（仅应用 1.23%APF 凝胶）、第 3 组（二极管激光；APF 凝胶后接触模式下应用 1W 持续 60 秒）和第 4 组（Er:YAG；80mJ、0.8W、10Hz；APF 凝胶后脉冲模式下应用 10 秒）。通过扫描电子显微镜（SEM）对标本进行形态学检查，并通过能量色散 X 射线（EDX）分析矿物质含量。通过方差分析对收集的数据进行统计学分析。
形态学结果在第 3 组中最好，其次是第 2 组和第 1 组，第 4 组中变化最小。EDX 分析的钙（Ca）、磷（P）和 Ca/P 比值重量%显示第 2 组和第 1 组之间无统计学意义，第 3 组和第 4 组之间呈下降趋势，且具有统计学意义。碳重量%在第 4 组中最高，其次是第 3 组、第 2 组和第 1 组。氟重量%在第 4 组中最高，其次是第 2 组、第 3 组和第 1 组。
与 Er:YAG 激光相比，二极管激光在 APF 应用后显示出更好的形态学效果。Er:YAG 增加了外釉质表面的氟吸收。
