Yassaei Sogra, Shahraki Neda, Aghili Hossein, Davari Abdolrahim
Department of Orthodontics, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Department of Operative, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Dent Res J (Isfahan). 2014 Mar;11(2):193-8.
Development of white spot lesions on enamel is a significant and common problem during the fixed orthodontic treatment. Various preventive methods have been suggested. The purpose of this study was to evaluate the preventive potential of MI Paste Plus, Er: YAG Laser and combined under similar in vitro conditions against demineralization.
In this experimental in vitro study, 60 extracted premolars were randomly allocated to four groups (n = 15) of control, MI Paste Plus, Laser and MI + Laser (MIL). Enamel surface of each group was treated with one of above materials before and during the pH cycling for 12 days through a daily procedure of demineralization and remineralization for 3 h and 20 h, respectively. Teeth were sectioned and evaluated quantitatively by cross-sectional microhardness testing at 20 μm intervals from the outer enamel surface toward dentinoenamel junction up to 160 μm and data were analyzed using the one-way analysis of variance and Tukey test. P < 0.05 was considered as significant.
MIL group had the least amount of demineralization (P < 0.001). Control group (C group) had the greatest relative mineral loss and the laser group (L group) had 45% less mineral loss than the C group and there was no significant difference between the MI Paste Plus and L group (P = 0.154).
BASED ON THESE RESULTS, ER: YAG laser was able to decrease demineralization and was a potential alternative to preventive dentistry and was more effective when combined with casein phosphopeptide-amorphous calcium phosphate products.
在固定正畸治疗期间，牙釉质上白斑病变的形成是一个重大且常见的问题。已提出了各种预防方法。本研究的目的是在相似的体外条件下评估MI Paste Plus、铒钇铝石榴石激光（Er:YAG Laser）以及两者联合使用对脱矿的预防潜力。
在这项体外实验研究中，60颗拔除的前磨牙被随机分为四组（n = 15），即对照组、MI Paste Plus组、激光组和MI + 激光组（MIL组）。在进行为期12天的pH循环之前和期间，通过每天分别进行3小时脱矿和20小时再矿化的程序，对每组的牙釉质表面用上述材料之一进行处理。将牙齿切片，并通过从牙釉质外表面向牙本质釉质界以20μm间隔直至160μm进行横断面显微硬度测试进行定量评估，使用单因素方差分析和Tukey检验对数据进行分析。P < 0.05被认为具有统计学意义。
MIL组的脱矿量最少（P < 0.001）。对照组（C组）的相对矿物质损失最大，激光组（L组）的矿物质损失比C组少45%，并且MI Paste Plus组和L组之间没有显著差异（P = 0.154）。
基于这些结果，铒钇铝石榴石激光能够减少脱矿，是预防牙科的一种潜在替代方法，并且与酪蛋白磷酸肽 - 无定形磷酸钙产品联合使用时更有效。
