RPD 2 Flashcards
What are spoon dentures used for
temporary
What are every dentures?
What are properties
Borders 3mm from the margins
Open design at saddle/tooth junction
Point contacts between abutment and artificial
Fanges includes to provide bracing
Posterior wire stops to prevent posterior drift and loss of contact
How are lateral stresses reduced in every dentures?
Balanced occlusion
What is included in the RPI system?
R = occlusal rest P = distal plane guide I = Gingivally approaching I-bar
When is the RPI system used?
For free-end saddle cases
What does the RPI system allow?
Minor connector and distal plate together act to provide reciprocation to the I-bar
Where should the I bar be placed in the RPI system?
Should be on or anterior to the midpoint of the buccal surface
What is the path of insertion?
Mechanical retention - relative to the path of displacement
Why consider creating guide planes?
when do it in particular?
To restrict the path of insertion
Particularly when providing musoca born RPD’s
How do you record a path of insertion?
3 marks with lead at fixed height
Scribe the side of model
Why may a shortened dental arch be necessary?
It is more important to maintain the teeth that remain rather than replacing the missing one
What does WHO say about a shortened dentition?
20 natural teeth throughout adulthood
Having a functional occlusion important
Why consider SDA over RPD?
RPD’s that replace molar teeth may not provide the patient with any immediate masticatory benefit
RPD’s often requiring patient to learn new skills to effectively use the appliance
A standard of OH is required is required by patient if further tooth loss is to be avoided
Patients may find this harder with an RPD
What are the disadvantages of SDA?
Increased risk of anterior tooth wear
RPD provision in future may be more challenging with fewer teeth, tongue space, controlling a larger denture
What’s the different combination work?
Milling a crown
Attachments
CoCr RPD/onlay - where space for acrylic teeth is limited, where increase in OVD
Telescopic crowns
What do undercuts need to be noted for?
Undercut for retention by creating a POI
Note undercut for retention for clasping