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Both cast circumferential and wrought wire clasps are supra bulge clasps, in that they engage an undercut on the tooth by originating coronal to the height of contour, while Roach clasps are infrabulge clasps and engage undercuts by approaching from the gingival. In addition there are a couple of specific theories which include the clasp design:
An Akers' clasp is the classic direct retainer for removable partial dentures. [1] Named after its inventor, Polk E. Akers, this suprabulge clasp consists of a rest, a guide plate, a retentive arm and a reciprocal arm. Akers' clasps, as a rule, face away from an edentulous area. Should they face the edentulous area, they are termed reverse ...
Thus, the orthodontic wire clasps used to retain interim palatal lift prostheses are sometimes extended in a mesial direction up to two mesiodistal tooth diameters. Clasps designed in this fashion can be flexed laterally by patients or their caregivers to facilitate the insertion and removal of the interim palatal lift prosthesis.
The wire for a permanent tooth is typically 0.7mm in diameter but 0.8mm can also be used, especially for clasps that are made to fit two teeth. [9] A clasp for a deciduous tooth can be made from 0.6mm [7] or 0.7mm wire [5] [6] and 0.6mm wire has been advocated for a canine. [6]
Rack Phase Difference (RPD) is a difference in the elevation between rack teeth of the chords of any single leg of a jackup rig with open truss-type legs. This type of jackup vessel operates with a rack and pinion drive system, as opposed to the pin-hole system found on jackups rigs with tubular legs. The legs are mostly triangular though some ...
Bitcoin surpassed $98,800 to touch a new record on Thursday after the Securities and Exchange Commission announced Chair Gary Gensler will step down effective Jan. 20, the day Donald Trump is ...
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Cobalt-chrome disc with dental bridges and crowns manufactured using WorkNC Dental. Cobalt-chrome or cobalt-chromium (CoCr) is a metal alloy of cobalt and chromium.Cobalt-chrome has a very high specific strength and is commonly used in gas turbines, dental implants, and orthopedic implants.