Barreda Graciela J, Dzierewianko Elizabeth A, Muñoz Karina A, Piccoli Gisela I
Sociedad Argentina de Ortodoncia, Buenos Aires, Argentina.
Universidad de Ciencias Empresariales y Sociales, Buenos Aires, Argentina.
Acta Odontol Latinoam. 2017 Aug;30(2):90-95.
Orthodontic treatments with Invisalign® require the use of attachments, which are composite resin buttons attached to tooth surfaces. Attachments constitute one of the most powerful tools for improving the efficiency of orthodontic tooth movement. The main purpose of this study was to evaluate surface wear over six months in two resin composites (Filtek Z350 XT, 3MESPE and Amelogen Plus TW, Ultradent Products Inc. ) used for making Invisalign® attachments. These composites were selected for their esthetic and mechanical properties. Forty attachments were bonded to the buccal surface of maxillary teeth. Materials were randomized and assigned in a double blind manner. Impressions were taken of the attachments using a preestablished technique immediately after bonding and following 6 months of clinical use. The impressions were examined by Scanning Electron Microscopy (SEM) at 12-fold magnification to identify changes in surface texture and attachment shape. Data were analyzed using Mann-Whitney's test on the overall ranking of detected changes in those variables. Statistically significant differences (P<0. 001) were found for surface wear, with greater changes in Amelogen Plus. Attachment shape did not change significantly in either material (P>0. 05). According to the results of this study, the alteration of the attachment surface during the first six months of treatment depends on the composite used, while attachment shape does not appear to be affected, so the clinical performance of the materials evaluated could be considered acceptable.
使用隐适美（Invisalign®）进行正畸治疗需要使用附件，这些附件是附着在牙齿表面的复合树脂纽扣。附件是提高正畸牙齿移动效率最有效的工具之一。本研究的主要目的是评估用于制作隐适美附件的两种树脂复合材料（3M公司的Filtek Z350 XT和Ultradent Products Inc.公司的Amelogen Plus TW）在六个月内的表面磨损情况。选择这些复合材料是因其美观和机械性能。将40个附件粘结在上颌牙齿的颊面。材料随机分配并采用双盲方式。在粘结后立即以及临床使用6个月后，使用既定技术对附件进行印模。在12倍放大倍数下通过扫描电子显微镜（SEM）检查印模，以确定表面纹理和附件形状的变化。使用Mann-Whitney检验对这些变量中检测到的变化的总体排名进行数据分析。在表面磨损方面发现了统计学上的显著差异（P<0.001），Amelogen Plus的变化更大。两种材料的附件形状均未发生显著变化（P>0.05）。根据本研究结果，治疗前六个月附件表面的改变取决于所使用的复合材料，而附件形状似乎未受影响，因此所评估材料的临床性能可被认为是可接受的。
