Wilson Dustin, Xu Changqi, Hong Liang, Wang Yong
Department of Oral Biology, University of Missouri-Kansas City School of Dentistry, 650 E 25th St, Kansas City, MO 64108, USA.
J Mater Sci Mater Med. 2009 Apr;20(4):1001-7. doi: 10.1007/s10856-008-3657-1. Epub 2008 Dec 13.
The objective of this study was to assess effects of some clinically related preparation procedures during tooth whitening on enamel bonding properties. Sixty-two extracted human teeth were cleaned and divided into four groups. Forty-two of the teeth were left with their natural surface intact while 20 teeth were polished to form a flat surface. Half of the tooth served as the experimental side and received one of the two whitening products: Opalescence (10% carbamide peroxide) and Crest Whitestrips (6.5% hydrogen peroxide), for 2 weeks. Post-bleaching intervals included: 1 day, 1 week, and 2 weeks. On these days, tooth (10 mm x 1.5 mm x 1.5 mm) sections were evaluated using Raman spectroscopy, scanning electron microscopy and tensile bond strength tests. T-test, ANOVA test, and mixed model regression analysis were used to assess the differences. No significant difference existed between natural surface and polished surface teeth for all groups at both Day One and Week Two (P > 0.05). On Day One, both treated groups had significant lower bond strength than the control group (P = 0.002). After 2 weeks, no significant difference existed between any group (P = 0.381). SEM indicated that resin-enamel interfaces in bleached enamel exhibited more defects in granular formations when compared to the control. Raman results indicated a lower degree of polymerization (DP) of adhesive at the interface for treated teeth surfaces. In summary, pre-bleaching surface treatments such as polish or non-polish, had no effect on bond strength. Bleaching significantly decreased bond strength initially, but after 2 weeks, bleaching had no significant effect on bond strength. Storage time had significant effect on Opalescence treated enamel, but not on control and Whitestrip treated enamel. The decrease of bond strength may be related to interfacial defects and low DP due to oxygen release after bleaching.
本研究的目的是评估牙齿美白过程中一些临床相关的制备程序对牙釉质粘结性能的影响。62颗拔除的人类牙齿经过清洁后分为四组。其中42颗牙齿保持其自然表面完整，而20颗牙齿经过打磨形成平坦表面。每颗牙齿的一半作为实验组，接受两种美白产品之一：皓齿（10%过氧化脲）和佳洁士美白牙贴（6.5%过氧化氢），为期2周。漂白后的间隔时间包括：1天、1周和2周。在这些时间点，使用拉曼光谱、扫描电子显微镜和拉伸粘结强度测试对牙齿（10毫米×1.5毫米×1.5毫米）切片进行评估。采用t检验、方差分析和混合模型回归分析来评估差异。在第一天和第二周，所有组的天然表面牙齿和打磨表面牙齿之间均无显著差异（P>0.05）。在第一天，两个处理组的粘结强度均显著低于对照组（P = 0.002）。2周后，任何组之间均无显著差异（P = 0.381）。扫描电子显微镜显示，与对照组相比，漂白牙釉质中的树脂-牙釉质界面在颗粒形成方面表现出更多缺陷。拉曼结果表明，处理过的牙齿表面界面处的粘合剂聚合度（DP）较低。总之，漂白前的表面处理，如打磨或不打磨，对粘结强度没有影响。漂白最初会显著降低粘结强度，但2周后，漂白对粘结强度没有显著影响。储存时间对皓齿处理的牙釉质有显著影响，但对对照组和美白牙贴处理的牙釉质没有影响。粘结强度的降低可能与漂白后氧气释放导致的界面缺陷和低DP有关。
