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Both fixed and removable functional appliances can be used to correct a malocclusion in three planes: Anterior-Posterior, Vertical and Transverse. In the Anterior-Posterior dimension, appliances such as Class II and Class III are used. Appliances used in transverse dimension are utilized to expand either the maxillary or the mandibular arch.
The Barrer retainers (aka Spring retainers) carry acrylic bows both labially and lingually. [10] The original appliance extended only to the canines, however due to the risk of swallowing or aspiration, a modification which includes cribs on the first molars has been described. These retainers can be used to realign minor lower incisor relapse ...
There can be no undercuts on the surface of the prepared tooth, as the restoration will not be able to be removed from the die or fit on the tooth (see explanation of lost-wax technique below for an understanding of the processes involved in crown fabrication). Conversely, too much taper will severely limit the grip that the crown has while on ...
Indirect retainer (An example is the little metal piece coming off the "U" at a 90 degree angle near the top of the upper photo, which is a cingulum rest on a canine.) Physical retainer (This is a mesh of metal that allows the pink base material to connect to the metal framework of the RPD. Some consider physical retainers their own component ...
When a removable denture is worn, retainers to hold the denture in place can be either custom made or "off-the-shelf" (stock) abutments. When custom retainers are used, four or more implant fixtures are placed and an impression of the implants is taken and a dental lab creates a custom metal bar with attachments to hold the denture in place.
One major advantage of the resin-retained bridge over a conventional bridge is the failure mode is likely to be debonding of the retainer. In conventional bridges , the failure mode is likely to be complete fracture of the abutment tooth with difficult-to-manage sequelae, possibly requiring root canal treatment .
The micro sensor was created to help parents and orthodontists monitor retainer use after braces are removed. The smart retainer chip is about the size of a shirt button and provides detailed information about the chip's environmental surroundings.
A palatal obturator may be used in cases of a deficiency in tissue, when a remaining opening in the palate occurs. In some cases it may be downsized gradually so that tissue can strengthen over time and compensate for the decreasing size of the obturator. The palatal lift however, is used when there is not enough palatal movement.