Colour stabilities of three types of orthodontic clear aligners exposed to staining agents.
Colour stabilities of three types of orthodontic clear aligners exposed to staining agents.
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DOI：
10.1038/ijos.2016.25
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发表时间：
2016-12-16
影响因子：
14.9
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本研究的目的是评估和比较三种类型的正畸透明矫正器在体外暴露于着色剂中的颜色稳定性。三家制造商(InvisAlign、AngelAlign和Smartee)生产的60种透明正畸矫正器被浸泡在三种染色溶液(咖啡、红茶和红酒)和一种对照溶液(蒸馏水)中。在浸泡12小时和7天后，在超声波清洁器中清洗准直器，并用色度计测量。颜色变化(ΔE*)是根据国际委员会L*a*b*颜色系统(L*a*b*)计算的，然后将结果换算成国家标准局单位。用傅立叶变换红外光谱(FT-IR)和扫描电子显微镜(SEM)分别观察了分子和形貌的变化。除了用咖啡染色的InvisAlign校正器外，三种类型的校准器在12 h的染色后显示出轻微的颜色变化。InvisAlign矫正器的ΔE*值(范围为0.3至27.81)显著高于AngelAlign和SmarteE矫正器(ΔE*值分别为0.33至1.89和0.32至1.61，P<；0.05)。FT-IR分析证实，聚合物结构在浸泡前后并未表现出明显的化学差异。扫描电子显微镜结果显示，染色7天后，三种类型的矫正器材料表面发生了不同的变化。三种美容正畸矫治器在浸泡12小时后颜色稳定，但Invisalign矫正器被咖啡弄脏了。INVISALIGN矫正器比AngelAlign和Smarte矫正器更容易出现色素沉着。校准器材料可以通过考虑美学的颜色稳定性属性来改进。
The aim of this study was to evaluate and compare the colour stabilities of three types of orthodontic clear aligners exposed to staining agents in vitro. Sixty clear orthodontic aligners produced by three manufacturers (Invisalign, Angelalign, and Smartee) were immersed in three staining solutions (coffee, black tea, and red wine) and one control solution (distilled water). After 12-h and 7-day immersions, the aligners were washed in an ultrasonic cleaner and measured with a colourimeter. The colour changes (ΔE*) were calculated on the basis of the Commission Internationale de I'Eclairage L*a*b* colour system (CIE L*a*b*), and the results were then converted into National Bureau of Standards (NBS) units. Fourier transformation infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) were conducted to observe the molecular and morphologic alterations to the aligner surfaces, respectively. The three types of aligners exhibited slight colour changes after 12 h of staining, with the exception of the Invisalign aligners stained with coffee. The Invisalign aligners exhibited significantly higher ΔE* values (ranging from 0.30 to 27.81) than those of the Angelalign and Smartee aligners (ΔE* values ranging from 0.33 to 1.89 and 0.32 to 1.61, respectively, P<0.05). FT-IR analysis confirmed that the polymer-based structure of aligners did not exhibit significant chemical differences before and after the immersions. The SEM results revealed different surface alterations to the three types of aligner materials after the 7-day staining. The three types of aesthetic orthodontic appliances exhibited colour stability after the 12-h immersion, with the exception of the Invisalign aligners stained by coffee. The Invisalign aligners were more prone than the Angelalign and Smartee aligners to pigmentation. Aligner materials may be improved by considering aesthetic colour stability properties.