Treatment of Class III malocclusion is a challenge for orthodontists. The best time to intercept this malocclusion is as early as in the deciduous dentition. Orthopedic management of Class III individuals with retruded maxilla is by protraction facemask along with rapid maxillary expansion (RME). It results in forward and downward maxillary growth and backward mandibular rotation. Alternate RME and contraction (Alt-RAMEC) produces faster and more efficient results than maxillary protraction alone. The present case report describes the clinical application of Alt-RAMEC protocol for the treatment of a Class III malocclusion.
Mousetrap appliance is an effective treatment modality for anterior open bite that utilizes implants inserted into the anterior palate and brings about open bite correction by intruding the maxillary molars. This is a finite element study that assesses the stress contours around maxillary molars and in the periodontal ligament of the maxillary molars when they are intruded by a mousetrap appliance. Materials and Methods: A finite element model of the maxilla and the mousetrap appliance made of 288332 elements and 64771 nodes was generated using software tools like MIMICS and HYPERMESH. A simulated force of 100 grams was applied to the maxillary molar through the appliance and the stress contours were assessed. Results: Maximum tensile stress was observed at furcation region of the PDL and was around 4.49e-3 MPa (0.00449MPa) whereas maximum Von-Mises stress was observed at cervical region on both the lingual and buccal side which was around 2.06e-2MPa (0.0206MPa).
Conclusion:It is therefore concluded that the mousetrap appliance which exerts a force within the range of recommended force for molar intrusion generates stress contours around the maxillary molar and in the periodontal ligament of the maxillary molar.
Arch wires are the backbone of orthodontic treatment. They generate required forces and bring about tooth movement through the medium of brackets and molar tubes. There are a variety of archwires that come in various cross sections. Recently many advances have been made and newer orthodontic wires have been introduced. In this article we will discuss the recent advances in orthodontic wires.
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