17929605
Description
Mind Map by Alice Dolman, updated more than 1 year ago
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Created by Alice Dolman
about 5 years ago
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“Metal partial dentures should
alwaysincorporate occlusal
supports.”Discuss this statement.
- Occlusal supports help to control stresses by directing forces within the long axis of the abutments. Whilst the
periodontal ligaments can be subjected to vertical forces, they struggle under horizontal or torsional forces.
- Rests function to:
- prevent movement of the removable partial denture framework in
a cervical direction
- preventing trauma to the mucosa located around the abutments and
beneath the framework
- Also maintains the retentive portions of clasps in prescribed
positions
- Assist in distribution of occlusal loads of several teeth
- Assist in distribution of occlusal loads of several teeth
- Also maintains the retentive portions of clasps in prescribed
positions
- preventing trauma to the mucosa located around the abutments and
beneath the framework
- prevent movement of the removable partial denture framework in
a cervical direction
- The rest is successful in resisting movement of the denture, by securely seating into a
preparation of an abutment tooth at an 90o angle or less with the proposed path of
insertion to prevent its migration.
- Support is provided almost entirely by rests.
- Some support is furnished by other ridged metal located above the
survey line e.g. rigid portions of retentive arms and bracing and reciprocating arms. However, they should never
be relied on to provide primary support.
- Some support is furnished by other ridged metal located above the
survey line e.g. rigid portions of retentive arms and bracing and reciprocating arms. However, they should never
be relied on to provide primary support.
- Occlusal supports are attached to abutments. The number of abutment teeth there are, influences the amount of
force that each tooth must withstand. So if there are less abutment teeth available the abutment tooth must
direct a larger load causing stress onto a tooth which may cause damage or mobility.
- Alternatively implants can be used as a rest. 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.
- An acrylic every denture is designed with no type of rest/stops/clasps
- when compared to a metal denture, if no occlusal
support is given the metal could possibly rub
against the soft tissues as it is a tougher material
for the oral cavity
- Metal being the heavier choice, clasps are needed to maintain retention
of the denture. With clasps, rests aid in keeping them in their desired
location.
- Occlusal supports may not be needed when it comes to acrylic dentures, however when working with metal, a
heavier more rigid material, supports are needed to maintain position of the framework. Also protecting the
mucosa by directing occlusal forces more evenly down the long axis of the abutment teeth.
- when compared to a metal denture, if no occlusal
support is given the metal could possibly rub
against the soft tissues as it is a tougher material
for the oral cavity
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