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Comparative Evaluation of Anchorage Loss During Fixed Orthodontic Technique with or without Anterior Mini-Implants in
Shaji T Varghese1, Ahelam Mundekat1, Mohammed Althaf1
1Department of Orthodontics and Dentofacial Orthopaedics, PSM College of Dental Science and Research, Thrissur, Kerala, India.
Objective:
The study used finite element analysis (FEA) to assess and quantify anchorage loss during simultaneous retraction and intrusion with or without anterior mini-implants under different forces.
Materials And Methods:
CBCT scans of a skeletal Class I patient were used. Mimics Research 18.0 was used to construct a maxilla 3D model from scans. FEA was done with ANSYS 2024 R2 employing a model with bilateral mini-screws and a control model without mini-screws. Each model received a 100g retraction force and additionally vertical intrusive forces 90 g, 120 g, and 150 g in model 2. Both models were limited to the superior maxilla and had appliance component glued connections.
Results:
FEA indicated that simultaneous intrusion and retraction enhanced maxillary first molar anterior displacement. The least displacement (6.24E-06 mm) occurred in model without mini-implants, while maximum displacement (6.86E-06 mm) in model with bilateral mini-implants with highest intrusive force.
Conclusion:
This study showed that conventional retraction without intrusive forces minimizes anchorage loss. With increasing force magnitude of intrusion, anterior molar displacement also increases.
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