Distalization pattern of whole maxillary dentition according to force application points

Area of Science:

• Orthodontics
• Biomechanics
• Finite Element Analysis

Background:

• Miniscrews are crucial for orthodontic anchorage.
• Understanding force vector effects on the entire maxillary arch is essential for predictable tooth movement.

Purpose of the Study:

• To analyze stress distribution and displacement patterns of the maxillary arch.
• To evaluate the impact of distalizing force vectors from interdental miniscrews.

Main Methods:

• A 3D finite element model simulated the maxillary teeth, periodontal ligament, and alveolar process.
• Tooth displacement was calculated along x, y, and z axes.
• Von Mises stress distribution was visualized using color-coded scales.

Main Results:

• Force at the archwire level caused lingual inclination of anterior teeth and intrusive distal tipping of posterior teeth.
• Force at a higher retraction hook level resulted in lingual root movement of anterior teeth and extrusive distal translation of posterior teeth.
• Posterior force application points increased extrusive lingual inclination of anterior teeth; vertical force components caused posterior intrusion and buccal tipping.

Conclusions:

• Maxillary arch displacement is directly related to the center of resistance and the line of action between miniscrews and force application points.
• This relationship allows for highly predictable total arch movement in orthodontic treatments.