principle of denture design Flashcards
what is required of a good design
a prosthesis that cannot be too rigidly connected to teeth and tissue because it is intended to be removable
need to minimise and distribute potentially destructive forces through proper design and procedures
What are some surfaces to consider
fitting surface
occlusal surface
polished surface
What are some forces to consider that acts on RPD
Vertical forces
Horizontal forces
rotational forces
What are the path of insertion determined by
guide planes
retentions
aesthetics
interferences
What does OSCARR mean
OSCAR
O: outline of saddle
S: support the saddle
C: connect the components
A– and
R: Retain
R: reciprocate and bracing
What does retention mean
It means resistance of denture to dislodge in the occlusal direction
What are some components that provide retention
clasp, flanges, guide planes, fitting surface of denture base, polished surface of denture, utilising undercuts using path of insertion to be different from that of displacement
does reciprocal arm engage an undercut?
no
What is reciprocation
ensures any forces is diametrically opposed at the point of application, resisting harmful lateral forces that may be applied to the teeth by clasps as they move over max curvature of teeth
What are some bracing components
flange, connector, bracing arm of clasp( the rigid portion of clasp arm)
what does bracing do
resists the horizontal components of masticatory forces
What do we normally not do when designing acrylic dentures
do not normally relieve gingiva
