RESTS ON TERMINAL ABUTMENT TEETH FOR A CAST METAL REMOVABLE PARTIAL DENTURE PROVIDES

The preparation is rounded, and the triangular concavity has smooth margins on the occlusal surface and a lowered, rounded marginal ridge. Interproximal Occlusal Rest Seats. The capacity for teeth to resist functional forces and remain stable over time is provided through their sophisticated support mechanisms. This rest should extend more than one-half the mesiodistal width of the tooth, should be approximately one-third the buccolingual width of the tooth, and should allow for a minimum of 1-mm thickness of the metal; the preparation should be rounded with no undercuts or sharp angles Figure In this application, the implant eliminates compression of supporting soft tissues, controls vertical movement of the denture base, eliminates or alters fulcrum lines, and serves to increase support and stability of the prosthesis. When an existing occlusal rest preparation is inclined apically toward the reduced marginal ridge and cannot be modified or deepened because of fear of perforation of the enamel or restoration, then a secondary occlusal rest must be employed to prevent slippage of the primary rest and orthodontic movement of the abutment tooth Figure Then, when a dislodging force is applied, the clasp arm should immediately become actively engaged to resist vertical displacement.

The proposed ring clasp design is outlined. If settling of the denture results in clasp arms that stand away from the tooth, some vertical displacement is possible before the retainer can become functional. It is important to realize that this goal can be achieved only through some form of tooth modification. When an existing occlusal rest preparation is inclined apically toward the reduced marginal ridge and cannot be modified or deepened because of fear of perforation of the enamel or restoration, then a secondary occlusal rest must be employed to prevent slippage of the primary rest and orthodontic movement of the abutment tooth Figure Rests should always be located on properly prepared tooth surfaces. Lingual Rests on Canines and Incisor Teeth.

Log In or Register to continue. In this application, the implant eliminates compression of supporting soft tissues, controls vertical movement of the denture base, eliminates or alters fulcrum lines, and serves to increase support and stability of the prosthesis.

The rest serves to prevent such settling and thereby helps to maintain the vertical stability of the partial denture. Maintains established occlusal relationships by preventing settling of the denture.

The rest should restore the occlusal morphology of the tooth that existed before preparation of the rest seat. If settling of the denture results in clasp arms that stand away from the tooth, some vertical displacement is possible before the retainer can become functional.

The use of an implant as a rest can also be considered. The prepared surface of an abutment to receive the rest is called the rest seat. If placed on a mesially inclined molar next to a modification space as in Figurethe treminal rest would ensure that the forces are directed down proovides long axis of the abutment, and therefore the disto-occlusal rest would not have been needed.

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Rest seats of smaller dimensions do not provide an adequate bulk of provjdes for rests, especially if the rest is contoured to restore the occlusal morphology of the abutment tooth. C, Meal support for this prosthesis is provided by rests that occupy definite, prepared, rest seats on the canine and occlusal surfaces of selected posterior teeth.

It is important to realize that this goal can be achieved only through some form of tooth modification. The capacity for teeth to resist functional forces and remain stable over time is removablr through their sophisticated support mechanisms.

Figure The deepest part of an occlusal rest preparation should be inside the lowered marginal ridge at X. The topography of any rest should restore the topography of the tooth that existed before the rest seat was prepared.

Closer to the abutment, however, more of the occlusal load is transmitted to the abutment tooth by means of the rest. Interproximal Occlusal Porvides Seats.

Stabilization against horizontal movement of the prosthesis must be provided by other components of the partial denture rather than by any locking effect of the occlusal rest, which will cause the application of leverages to the abutment tooth.

Form of the Occlusal Rest and Rest Seat 1. In situations in which the abutment is severely tilted, the extended occlusal rest may take the form of an jetal to restore abutmemt occlusal plane Figure Such a rest should pass over the lowered marginal fr on the side of the tooth opposite the primary rest and should, if possible, be inclined slightly apically from the marginal ridge.

The patient could not afford a crown to improve axial alignment or orthodontic treatment to upright the molar. Occlusal rests will be used on mesio-occlusal and disto-occlusal surfaces to support restoration and direct forces over the greatest root mass of the abutment. Directs and distributes occlusal loads to abutment teeth.

Figure The floor of the occlusal rest seat should be inclined apically from the lowered marginal ridge. Rests should always be located on properly prepared tooth surfaces.

This rest should extend more than one-half the mesiodistal width of the tooth, should be approximately one-third the buccolingual width of the tooth, and should allow for a minimum of 1-mm thickness of the metal; the preparation should be rounded with no undercuts or sharp angles Figure The various forms of rests have as a main goal a form that allows for axial loading.

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Implants as a Rest. Rests are designated by the surface of the tooth prepared to receive them occlusal rest, lingual rest, and incisal rest. Caution should be exercised in preparing a rest seat to avoid creating sharp edges or line angles in the preparation. F, Occlusal force applied to the abutment tooth.

6: Rests and Rest Seats

An angle greater than 90 degrees fails to transmit occlusal forces along the supporting vertical axis of the abutment tooth. Jan 17, Posted by mrzezo in Prosthodontics Comments Off on 6: Rests and Rest Seats. Because the most effective resistance can be provided if the tooth is stressed along its long axis, the prosthesis framework should engage the tooth in a manner that encourages axial loading.

D, Kennedy Class III, modification 1 maxillary arch with rest seats prepared on removablw lingual surfaces of the canine and lateral incisor, and on the occlusal surfaces aubtment the premolar and molar. The preparation is teeyh, and the triangular concavity has smooth margins on the occlusal surface and a lowered, rounded marginal ridge. Maintains components in their planned positions. Form of the Occlusal Rest and Rest Seat.

McCracken’s Removable Partial Prosthodontics 12e. Lingual Rests on Canines and Incisor Teeth.

Rests on terminal abutment teeth for a cast metal removable partial denture provide – Quizzn

Incisal Rests and Rest Seats. Extended Occlusal Rest In Kennedy Class II, modification 1, and Kennedy Class III situations in which the most posterior abutment is a mesially tipped molar, an extended occlusal rest should be designed and prepared to minimize remkvable tipping of the abutment and rdsts ensure that the forces are directed parial the long axis of the abutment.

It should be as long as it is wide, and the base of the triangular shape at the marginal ridge should be at least 2. However, two opposing occlusal rests on diverging tooth inclines will function to prevent unfavorable forces if all related connectors are sufficiently rigid. When rests prevent movement of the denture in an apical direction, the position of the retentive portion of the clasp arms can be maintained in designated relation to the tooth undercuts. The load is thereby distributed between the abutment and the supporting residual ridge tissue.