Paediatric Dental Specialist Clinic, Sarawak General Hospital, Kuching, Sarawak, Malaysia; Centre of Paediatric Dentistry and Orthodontics Studies, Faculty of Dentistry, Universiti Teknologi MARA, 47000 Sungai Buloh, Selangor, Malaysia.
Department of Oral Science, Faculty of Dentistry, University of Otago, 310 Great King Street, Dunedin, 9016, New Zealand.
Photodiagnosis Photodyn Ther. 2024 Feb;45:103989. doi: 10.1016/j.pdpdt.2024.103989. Epub 2024 Jan 26.
Resin infiltration is used to mask enamel opacities and the recommended etching cycles are three. However, anecdotal evidence suggests that favorable esthetics outcomes can be obtained by increasing the etching cycles.
To determine the incremental and total enamel loss when enamel surfaces are exposed to multiple etching cycles and to assess the relative attenuation coefficient after multiple etching cycles and resin infiltration treatment.
Ninety extracted sound human premolars teeth were divided into 9 groups (n = 10); with each consecutive group having one additional etching cycle up to 9 cycles. The teeth were scanned with optical coherence tomography and enamel loss and attenuation coefficient were measured with MATLAB software. Enamel loss (one-way ANOVA, p ≤ 0.05) and attenuation coefficient (two-way ANOVA, p ≤ 0.05) were statistically analyzed.
There was a significant total enamel loss of more than 33% found at the 7th etching cycle and more. There was no statistically significant difference in the incremental mean depth of penetration of resin between various etching cycles (F(8, 134) = [2.016], one-way ANOVA, p = 0.185).
This study recommends that etching should not be repeated more than seven cycles to prevent excessive enamel loss. Following eight etching cycles, resin infiltration penetration appears approximately equal to that of healthy enamel.
树脂渗透被用于遮盖牙釉质的不透明性，建议的蚀刻循环次数为三次。然而，有传闻证据表明，通过增加蚀刻循环次数可以获得更满意的美学效果。
确定在暴露于多个蚀刻循环时牙釉质表面的增量和总损失，并评估多次蚀刻循环和树脂渗透处理后的相对衰减系数。
将 90 颗提取的健康人前磨牙分为 9 组（n = 10）；每组依次增加一个蚀刻循环，最多可达 9 个循环。使用光学相干断层扫描对牙齿进行扫描，使用 MATLAB 软件测量牙釉质损失和衰减系数。使用单向方差分析（one-way ANOVA，p ≤ 0.05）对牙釉质损失和衰减系数进行统计分析。
在第 7 个和更多的蚀刻循环中发现了超过 33%的总牙釉质损失，具有统计学意义。在不同蚀刻循环之间，树脂的增量平均渗透深度没有统计学上的显著差异（F(8, 134) = [2.016]，单向方差分析，p = 0.185）。
本研究建议，蚀刻不应重复超过七次，以防止牙釉质过度损失。在进行了 8 次蚀刻循环后，树脂渗透的深度似乎与健康牙釉质相当。
