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Traditional elastic ligatures versus slide ligation system. A morphological evaluation
R Condò1, A Casaglia, E Armellin
1Department of Clinical Sciences and Translational Medicine, University of Rome "Tor Vergata", Rome, Italy.
ORAL & Implantology
|August 31, 2013
Summary
This study found that latex and polyurethane O-ring orthodontic ligatures deform significantly after 28 days of clinical use, indicating reduced functionality. Low-friction ligatures showed minimal dimensional changes, suggesting better durability.
Area of Science:
- Biomaterials Science
- Orthodontic Materials Research
- Dental Mechanics
Background:
- Elastomeric ligatures are crucial in orthodontics for tooth movement and space closure.
- Frictional forces and ligating strength are key factors in the archwire-bracket-ligature complex.
- Understanding ligature deformation is essential for optimizing orthodontic treatment outcomes.
Purpose of the Study:
- To analyze the elastic deformation of three distinct elastomeric ligature types after clinical application.
- To compare the structural and dimensional changes in latex and polyurethane ligatures.
- To evaluate the impact of clinical use on ligature performance and potential friction.
Main Methods:
- Three types of elastomeric ligatures (latex O-ring, polyurethane O-ring, polyurethane low-friction) were used in 9 orthodontic patients.
- Ligatures were placed in vivo for 28 days, securing 0.16 x 0.22-inch stainless steel archwires.
- Scanning electron microscopy (SEM) was employed to assess dimensional and structural variations compared to unused controls.
Main Results:
- Transparent latex O-ring ligatures exhibited significant volumetric changes, with increased diameters and decreased thickness.
- Polyurethane O-ring ligatures also showed increased diameters, with internal borders becoming squared and irregular.
- Grey, polyurethane low-friction ligatures demonstrated minimal dimensional changes, with slight increases in length/width and no significant thickness reduction.
Conclusions:
- Latex and polyurethane O-ring ligatures undergo substantial structural and volumetric changes in vivo, suggesting increased friction and premature loss of function.
- Grey, polyurethane low-friction ligatures maintained their integrity with limited dimensional variation, indicating superior clinical performance and durability.
