PRPD 2 Flashcards
What are some solutions to control the issues with the rotation around fulcrums with K1 and K2 PRDPs?
A. Indirect retention.
B. Design new clasps and M rests.
C. Best saddle extension and fit to soft tissues.
How does the altered cast improve the fulcrum issues.
The dual impression technique creates saddle stabilization for distal extension PRDPs.
What are the benefits of multiple RCT teeth beneath PRDP saddles
Propioception, bone preservation leading to stability and retention.
What are the abutment considerations for clinical success?
Periodontal health/patient factors. Endodontic health. Occlusal health. Restorative health.
Interim PRDP indications
Young patients, traumatic tooth loss, rapid caried, hereditary partial anodontia. Health, older adult patients with compromised medical conditions. Time.
Uses of interim PRDPs
Maintain a space. Re-establish occlusion. Replace visible missing teeth. Service during periodontal or implant therapy. “practice” for a permanent one.
What types of retention are used in interim prdps?
Wrought/ortho wire, ball clasps, interproximal acrylic struts, surface tension, adhesives.
How far back do you extend interim PRDPs?
Same as full dentures in distal extension patients. Pterygomaxillary notch extension and retromolar pad/tuberosity coverage.
Transitional PRDPs
Transition to complete dentures. To avoid immediate extractions when some or all of the teeth are hopeless, but the patient is not physiologically or psychologically ready.
Treatment PRDPs
Vehicle for tissue conditioning. Splint to establish a new VDO or occlusal relationship and evaluate the patient’s progress. Occlusal guard to correct or control undesirable oral habits.
What is the best technique to make repairs?
Make a pick-up alginate impression, and pour a cast with the PRDP in the impression. Then remove the PRDP from the cast to make needed repairs.
Intracoronal attachments
Within the crown. Usually a prefabricated key/keyway with parallel walls within the contours of a restoration.
Extracoronal attachments
Mechanical resistance to displacement through components attached to the external surface of an abutment tooth.
Advantages of extracoronoal attachments
Esthetics. Mechanical: Functional loads are more apically directed. Improved cross-arch load transfer and prosthesis stabilization.
Disadvantages of extra and intracoronoal attachments.
Complexity of design, fabrication and clinical treatment. Demanding crown preparation for space, vertical height, laboratory technique, path of insertion, cost, wear of components and maintenance.
Contraindications
Poor periodontal health and crown to root ratio. Compromised endodontic and restorative conditions, bad manual dexterity. Oral hygiene.
What are the attachements used?
ERA, SA Swiss Anchor/CEKA, Allegro DE.
When are the crowns made?
Crown prep, impression and jaw relation second.
When is the framework made?
FIRST!
Indication for an AP path in the saggital plane
MX/MN Class IVs without modification spaces and visible clasping is not an option.
PA Path, saggital plane.
MN Class IIIs with mesially tipped molar abutments and bilateral edentulous segments.
Indications for the frontal plane
MX/MN Class IIs (lateral path) or Class IIIs (unilateral) with no modification spaces (lateral path).
