Transpalatal arch hinge mechanic using dental and skeletal anchorage for molar intrusion: a biomechanical approach
Authors
Marino Musilli, Eda Fani, Damiano Musilli, Carla Romanucci, Alfredo De Rosa, Martina Ferrillo
Abstract
Molar intrusion represents a challenging objective in orthodontic treatment, particularly in adult patients. The integration of skeletal anchorage with conventional dental anchorage systems has expanded the possibilities for achieving controlled vertical tooth movement. This report presents a biomechanical approach based on a transpalatal arch (TPA) hinge mechanic combined with both dental and skeletal anchorage to achieve effective molar intrusion.
A biomechanical approach is described involving patients requiring maxillary molar intrusion to correct vertical discrepancy and occlusal imbalance. The proposed technique utilized a modified TPA designed to function as a hinge system, in conjunction with temporary anchorage devices (TADs). The biomechanical setup enabled the application of intrusive forces while minimizing unwanted tipping and transverse effects. Careful force vector control and appliance design were key factors in ensuring efficient and predictable tooth movement.
The application of this combined dental–skeletal anchorage system resulted in successful molar intrusion, improved occlusal relationships, and favorable vertical control without significant adverse effects. The treatment demonstrated good stability during the observation period and required minimal patient compliance.
The TPA hinge mechanic supported by skeletal anchorage represents a reliable and minimally invasive approach for molar intrusion. This technique allows precise biomechanical control and may be considered a valuable option for managing complex vertical discrepancies in orthodontic patients.
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