Removable Pros Flashcards
What mouth preparations do you need to do before making dentures
-Manage perio disease
-Extract poor prognosis teeth
-Restore teeth before master imp
-Treat denture stomatitis
-Treat denture granuloma
What are the functions of primary casts
-To make special trays
-Patient education
-Pre/post treatment records
-Plan denture
What is jaw relationship
-Horizontal and vertical component
-Must be reproducible
What is centric relation
-Condylar disc assembly is in the most superior anterior position within the glenoid fossa
When do we use centric relation
-Less than 3 contacts
-Wear cases where the teeth are being built up
What does a facebow record
-Relationship between the terminal hinge axis (runs between condylar heads) and upper occlusal plane
What are the function of rest seats
-Transmit forces along the long axis of the tooth
-Provide support (prevent damage to soft tissues)
-Stabilise occlusion
-Prevent some horizontal movement
-Prevent food packing
What are guide planes and what are they used for
-Two or more parallel tooth surfaces
-Provide friction to retain denture
-Enable path of insertion to be restricted to ensure accuracy of clasps
-Contribute to retention and stability
-Reduces black triangles
What is path of insertion
Path of the denture from first point of contact to seating
Why are special trays more accurate
-Allow an even thickness of material all around
-This reduces distortion
What is the Kennedy classification
Class I: Bilateral free-ended saddle
Class II: Unilateral free-ended saddle
Class III: Unilateral bounded saddle
Class IV: Bilateral anterior bounded saddle
What are the types of clasps, reciprocation and indications for each
-Gingivally approaching clasps: anterior teeth, cingulum rest seat for reciprocation
-Occlusally approaching clasps: premolars/molars, reciprocating arm
How do clasps work
-Terminal third of the clasp arm engages in the undercut
-Accuracy improved with guide planes
Advantages of CoCr over acrylic
-Stronger
-Less bulky
-Hygienic design (lingual bar)
-Provides tooth support and better retention
-Easier to clean
-Metal overlays are possible
-Better thermal conductivity
List effects of tooth loss on denture construction
-Loss of alveolar bone
-Change in occlusal scheme
-Drifting and rotating of teeth
-Excessive load on remaining teeth
-Changes to speech
-Changes to facial profile
Why is a denture better than fixed pros?
-Cheaper to make
-Can replace large edentulous spans
-Reversible
-Temporary option
Types of rest seats and when you need to to tooth prep for a rest seat
-Occlusal, cingulum and incisor rest
-Prep tooth if there is not enough occlusal clearance OR to correct the occlusal surface
Disadvantages of dentures
-Plaque traps
-Can exacerbate periodontal disease
-Bulky
-Poor compliance due to comfort
-Ulcers/pain underneath
Anatomical landmarks to record in the impression
-Retromolar pad
-Maxillary tuberosity, hamular notch, vibrating line
-Sulci, frenum
What is the denture space
Space between tongue, lips and cheeks and residual alveolar ridges
What are the three denture surfaces
-Occlusal surface
-Fit surface
-Polished surface
What features help with retention of the denture
-Saliva layer gives a suction affect for complete dentures
-Muscles hold in place
-Opposing upper and lower teeth
-Gravity keeps lower denture in place
-Clasps (direct retention)
-Rests (indirect retention)
What is the role of saliva in denture retention?
-Provides a peripheral seal due to inter surface tension in upper complete dentures
-Thin saliva works better
-Dry mouth –> poor seal
How does the sulcus affect denture retention and stability
-Denture flange must fill width of sulcus to create a better seal
-Impressions must record full depth of sulcus
-If flange extended too deep, muscles will push the denture out during movement
