Rubber Coating Rapid Dental Orthodontic Appliances Plastic Tray
Orthodontic Expansion: It is well known that expansion of the
dental arches can be produced by a variety of orthodontic
treatments, including those that employee fixed appliances.
Orthopedic Expansion : Rapid maxillary expansion (RME) appliances
are the best examples of true orthopedic expansion in that changes
are produced primarily in the underlying skeletal structures rather
than by the movement of teeth through alveolar bone.
Passive Expansion when the occlusion is shielded from the forces of
the buccal and labial musculature, a widening of the dental arches
often occurs. This expansion is not produced through the
application of extrinsic biomechanical forces, but rather by
intrinsic forces such as those produced by the tongue.
Example as passive expansion are the dimensional changes in the
dental arches produced by such vestibular shield appliances as the
FR-2 of Frankel.
1. Rapid Palatal Expansion Appliances e.g. : Haas appliance.
2. Slow Palatal Expansion Appliances e.g. : Quad Helix ,NiTi
3. Dentoalveolar expansion Appliances e.g. : Conventional fixed