Comparative assessment of forces generated during simulated alignment with self-ligating and conventional brackets

Area of Science:

• Orthodontics
• Biomechanical Engineering

Background:

• Orthodontic treatment involves applying controlled forces to move teeth.
• Bracket systems differ in design, potentially influencing force and moment generation during alignment.

Purpose of the Study:

• To compare the forces and moments produced by three different orthodontic bracket systems (Orthos2, Damon2, In-Ovation R) during the initial leveling and alignment phase.
• To analyze the magnitude and direction of these forces and moments on specific teeth (lateral incisor, canine, first premolar) in a crowded mandibular arch model.

Main Methods:

• Three bracket systems were tested on resin replica models of a crowded mandibular arch.
• A 0.014-inch Damon archform CuNiTi wire was used, and measurements were taken using the Orthodontic Measurement and Simulation System (OMSS).
• Static measurements of forces and moments were recorded for six components, with statistical analysis including one-way ANOVA and Tukey's post hoc tests.

Main Results:

• Self-ligating brackets generated higher forces in the buccolingual direction compared to conventional brackets.
• The lingually inclined lateral incisor experienced the lowest vertical force but showed significant extrusive and buccal movement.
• Moments generally followed force trends, with self-ligating brackets applying higher moments in the buccolingual direction.

Conclusions:

• Bracket system design influences the biomechanical forces and moments during initial orthodontic alignment.
• Self-ligating brackets exhibit distinct force and moment profiles, particularly in the buccolingual direction, compared to conventional systems.
• Understanding these differences is crucial for optimizing treatment strategies and predicting tooth movement during leveling and alignment.