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Sliding resistance with esthetic ligatures: an in-vitro study
Thaís Gelatti Bortoly1, Ariana Pulido Guerrero, Rodrigo Nunes Rached
1Graduate Dentistry Program in Orthodontics, Pontifical Catholic University of Paraná, Curitiba, Brazil. ingalill.feldmann@lg.se
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.
