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Sliding resistance with esthetic ligatures: an in-vitro study

linhongcrystal 添加于 2010-5-15 01:07 | 1045 次阅读 | 0 个评论

作者
Bortoly TG, Guerrero AP, Rached RN, Tanaka O, Guariza-Filho O, Rosa EAR
摘要
INTRODUCTION: This study was developed to evaluate in vitro the properties related to sliding resistance of esthetic ligatures. METHODS: Frictional force of 6 ligatures--2 conventional, 2 specially coated elastomeric, Teflon-coated (Dupont, Wilmington, Del) stainless steel, and stainless steel (control) ligatures--were studied by sliding 0.019 x 0.025-in stainless steel wire through the 0.22-in slot of stainless steel bracket. Elastomeric ligatures were tested for frictional and tensile forces under 3 experimental conditions: recent stretching, after 21 days of simulated stretching in artificial saliva, and a demineralizing/remineralizing regimen. Statistical analysis was conducted with ANOVA and Games-Howell tests. RESULTS: There was high correlation between frictional and tensile forces of elastomeric ligatures, with reduction of both after 21 days. The demineralizing/remineralizing regimen reduced the frictional forces of ligatures to the same level as the ligatures in artificial saliva. Teflon-coated and stainless steel ligatures showed the lowest initial frictional forces, but there was no difference in friction of stainless steel and post-stretched elastomeric ligatures. CONCLUSIONS: Frictional forces generated by esthetic elastomeric ligatures under simulated oral environments are not stable and are more related to tensile force than to surface characteristics of the ligatures.
详细资料
- 关键词: Analysis of Variance; Coated Materials, Biocompatible; Dental Stress Analysis; Elastomers; *Esthetics, Dental; Friction; Hydrogen-Ion Concentration; *Orthodontic Appliances; Orthodontic Brackets; Orthodontic Wires; Polytetrafluoroethylene; Saliva, Artificial; Stainless Steel; Statistics, Nonparametric; Tensile Strength
- 文献种类:期刊
- 期刊名称: American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, its Constituent Societies, and the American Board of Orthodontics
- 期刊缩写: Am J Orthod Dentofacial Orthop
- 期卷页: 2008年第133卷第3期 340.e1-7页
- 地址: Graduate Dentistry Program in Orthodontics, Pontifical Catholic University of Parana, Curitiba, Brazil. ingalill.feldmann@lg.se
- ISBN: 0889-5406
- 备注:PMID:18331929
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