变形链球菌在美观型、镍钛合金和不锈钢弓丝上黏附的短期体外比较分析
Comparative short-term in vitro analysis of mutans streptococci adhesion on esthetic, nickel-titanium, and stainless-steel arch wires.
作者信息
Kim In-Hye, Park Hyo-Sang, Kim Young Kyung, Kim Kyo-Han, Kwon Tae-Yub
机构信息
a Graduate Student, Department of Dental Science, Graduate School, Kyungpook National University, Daegu, South Korea.
出版信息
Angle Orthod. 2014 Jul;84(4):680-6. doi: 10.2319/061713-456.1. Epub 2013 Dec 5.
OBJECTIVE
To test the hypothesis that there are no differences in mutans streptococci (MS) adhesion between esthetic and metallic orthodontic arch wires based on their surface characteristics.
MATERIALS AND METHODS
Surface roughness (Ra) and apparent surface free energy (SFE) were measured for six wires-four esthetic, one nickel-titanium (NiTi), and one stainless-steel (SS)-using profilometry and dynamic contact angle analysis, respectively. The amount of MS (Streptococcus mutans and Streptococcus sobrinus) adhering to the wires was quantified using the colony-counting method. The surfaces, coating layers, and MS adhesion were also observed by scanning electron microscopy. Statistical significance was set at P < .05.
RESULTS
The Ra values of the esthetic wires were significantly different from one another depending on the coating method (P < .05). The NiTi wire showed the highest SFE, followed by the SS wire and then the four esthetic wires. The NiTi wires produced a significantly higher MS adhesion than did the SS wires (P < .05). The esthetic wires showed significantly lower MS adhesions than did the NiTi wire (P < .05). Pearson correlation analyses found moderate significant positive correlations between the SFE and the S mutans and S sobrinus adhesions (r = .636/.427, P < .001/P = .001, respectively).
CONCLUSIONS
The hypothesis is rejected. This study indicates that some esthetic coatings on NiTi alloy might reduce MS adhesion in vitro in the short term.
目的
验证基于美学正畸弓丝和金属正畸弓丝的表面特性，变形链球菌（MS）在二者表面的黏附不存在差异这一假设。
材料与方法
分别采用轮廓仪和动态接触角分析法，对六种弓丝——四种美学弓丝、一种镍钛（NiTi）弓丝和一种不锈钢（SS）弓丝——的表面粗糙度（Ra）和表观表面自由能（SFE）进行测量。采用菌落计数法对黏附在弓丝上的MS（变形链球菌和远缘链球菌）数量进行定量分析。还通过扫描电子显微镜观察了弓丝表面、涂层以及MS的黏附情况。设定统计学显著性水平为P < 0.05。
结果
根据涂层方法的不同，美学弓丝的Ra值存在显著差异（P < 0.05）。NiTi弓丝的SFE最高，其次是SS弓丝，然后是四种美学弓丝。NiTi弓丝产生的MS黏附显著高于SS弓丝（P < 0.05）。美学弓丝的MS黏附显著低于NiTi弓丝（P < 0.05）。Pearson相关性分析发现，SFE与变形链球菌和远缘链球菌的黏附之间存在中度显著正相关（r分别为0.636/0.427，P < 0.001/P = 0.001）。
结论
该假设被否定。本研究表明，NiTi合金上的某些美学涂层可能在短期内降低体外MS的黏附。
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