Some errors in the design of removable denture

The relationship between location and function: objects with certain morphology only in the proper place to play out with the function, prosthesis shape and location of the production staff need to be considered in the design and production process of the restoration time.

Removable denture bracket must have the perfect shape and exact location to meet the needs of patients in function, appearance, comfort and other aspects of Removable denture stent design errors in the production of almost all can be attributed to the denture part of the shape and location of design errors.

Clasp design of common errors: FPD retainer card ring common seated Road, the denture can not be in place, snap ring into the undercut area to the inelastic part of the denture can not be in place or in place after the card ring arm to leave the dental supplies tooth retention arm elastic part of the surface, the snap ring retainer arm elastic section located in a non undercuts District, no retention effect, clasp into the undercuts too much or too little, against the arm of the clasp into the undercut, the clasp arm form the proportion of exception.

Clasp retention force of a decision factors: neck contraction of the angular size of the card end of the arm into the depth of the neck contraction angle, the flexibility of the card arm, the card arm length from the beginning to the end of the thickness of the card arm, cross-sectional form card arm of the material.

If you do not consider changes in the clasp flexible clasp retention force should depend on the retention of part of the card arm into the depth of the undercut, rather than the distance and the wire.

Casting clasp retentive arm into the undercut and the depth of the standard:

Gold alloy: the premolar annular snap ring is 0.25mm, the molar circular ring clasp 0.25 ~ 0.5mm, the rod-shaped clasp 0.5 ~ 0.75mm.

Cobalt-chromium alloy at the lower limit of the above data or The advantages of removable denture repair smaller value card arm of the cross-section shape: the forging the Szymborska ring round, casting clasp semi-circular, elastic non-tapered conical card arm.