Prosthetic IV.
Removable dentures
Removable dentures
Removable partial dentures Complete denture
Removable partial dentures
Class I.
Dental arch with gaps (interruptions)
Teeth supported (borne) dentures
Class
Reduced (shortened) dental arch
Teeth and tissue supported (borne)
dentures
Way of the transfer of masticatory
forces
> Tooth
> Tooth and oral mucosa >Oral mucosa
Tooth and/or oral mucosa
bone
Base -replaces missing part of alveol and carrying arteficial teeth.
Base (basis)
Supports the supplied teeth and effects the transfer of occlusal stresses to the supporting oral structures.
Different materials - metal framework + resin (attached to the metal framework) Or resin only
Accuracy of adaptaion to the tissues with low volume change
Dense, non irritating surface that is capable of receiving and maintaining a good finish
Thermal conductivity
Low specific gravity
Sufficient strength - resitance to fracture
Easily kept clean
Aesthetics acceptability
Potential for future relining
Low initial cost
Components
■ Elements of anchorage Clasps- casted clasps, wire clasps, combined clasps.
Anchorage supporting bar
Attachements
Telescope crowns
Components
Teeth - acrylic teeth - porcelain teeth
Clasps
Cast clasp
Surface retainers - they he on the surface of teeth
Arms - one, two or three arms
Clasps
i One arm made of wire
> Simple retainer, only in simply temporary prothesis.
> It can damage the tooth because no stabilization (bracing)
Clasps
:■ Two arms clasps
One arm for retention (wire)
One arm for stabilization against horizontal forces
Clasps
: i Three arms clasps
One arm for retention (wire)
One arm for stabilization (bracing) against
horizontal forces
On arm for transmission of occlusal forces
Clasps
:■ Three arms clasps
One part for retention (going under the
maximal convexity)
One part for stabilization against horizontal
forces (upon the maximal convexity)
On arm for transmission of occlusal forces
the rest)
Rests
Any unit of a partial denture that rests upon a tooth surface to provide vertical support to the denture is called a rest
Upon the occlusal surface (premolar, molar)
Upon the lingual surface (prepared) of anterior teeth
Transmitted forces [ of the tooth will prev cervical direction.
Darallel to the long axis rent movement in a
Components
Connectors
Connect the parts of denture
9
Components
Connectors
Connect the parts of denture
9
Major connector
Connect the parts of the prothesis
All other parts are directly or indirectly attached to it
Musi be rrgid - stresses may be effectively distributed over the entire are
Mandibular major connector
Lingual bar
Lingual plate (continouos bar retainer and
lingual bar,
Maxillary major connector
Anterior and posterior palatal bar
U- shaped palatal connector
Palatal plate - type connector
Minor connectors
Arising from the major connector -join the major connector with other parts of the denture.
Placed not on a convex surface of the abutment teeth but in embarasure