Introduction Flashcards
2 Types of removable prostheses
Complete Denture
Removable Partial Denture
3 Types of RPDs
Cast Metal Frame
Acrylic
Flexible Base
90% of this course
Cast Metal Frame
Cast Metal Frame
made of
CoCr
NiCr
— is used more often,
because
CoCr
patients may have
Nickel sensitivity.
• Prosthetics:
– art or science of replacing absent body parts
Prosthesis:
any artificial part
Prosthodontics:
– branch of dentistry that pertains to the
replacement of missing teeth and oral tissues
Prosthodontics divisions:
(3)
– Fixed prosthodontics
– Removable prosthodontics
• Complete
• Partial
– Maxillofacial prosthetics
Dental Prosthesis:
– artificial replacement of 1 or more teeth and/or
associated structures
Fixed Partial Denture (FPD):
(2)
– Prosthesis replacing teeth in partially dentate arch.
– Not designed to be removed by patient.
Removable Partial Denture (RPD):
(2)
– Prosthesis replacing teeth in partially dentate arch.
– Designed to be removed by patient.
Abutment:
– Tooth used to support prosthesis
Residual (edentulous) ridge:
(2)
– Residual bone & soft tissue covering that
remains after tooth loss.
– Part of support for certain types of RPDs
Centric Relation:
– Maxillomandibular relationship in which the
condyles articulate with the thinnest avascular
portion of their respective disks with the complex
in the anterior-superior position against the slope
of the articular eminence.
CR
– Position independent of
tooth contact.
CR
– Position restricted to purely — motion.
rotational
Maximal intercuspal position
– Position with complete intercuspation of
opposing teeth.
MIP
Independent of
condylar position
MIP
Previously called
Centric (Habitual)
Occlusion
Model:
reproduction for demonstration,
accuracy not implied.
Cast:
An accurate positive reproduction of the
maxillary or mandibular arch.
Diagnostic Cast:
Cast for the purpose of
diagnosis & treatment planning.
Master Cast:
Replica of teeth, residual ridges,
& other parts of the dental arch used to
fabricate dental restoration or prosthesis
Tooth-supported RPD:
– RPD that depends entirely
on natural teeth for support
Tooth-tissue supported RPD
(3)
– Extension base RPD
– RPD supported and retained by
teeth at only one end.
– Denture base is supported by teeth & the
residual ridge
skipped
Indications for RPDs
(7)
• Edentulous area(s) too long or
numerous for a fixed prosthesis
• Need to restore lost soft and hard
alveolar tissue, especially in the anterior
region****
• Reduced periodontal support of
remaining teeth
• Need to distribute masticatory
stresses across the dental arch:
cross-arch stabilization
• No posterior abutment tooth
• Immediate replacement of teeth
• Attitude & desires of patient (economic
considerations)
Disadvantages of RPDs
(5)
• Removable, not considered ‘part’ of
patient
• May be lost or broken
• Clasps may be visible, less esthetic
• May dislodge during function
• May trap food while eating
Height of Contour/Survey Line
– Line encircling a tooth
that designates its greatest
diameter at a selected position
determined by a dental surveyor
Height of contour will change if the
axial
inclination is changed
Suprabulge Area
Portion of tooth above
the height of contour
Infrabulge Area
– Portion of tooth below the height of contour
Infrabulge Area
May also be referred to as
Undercut
Undercut:
• Surface of object below the height of contour in
relation to the path of placement
