Test 1 Flashcards
(48 cards)
Treatment planning cast vs. complete denture patient cast
Denture patient cast needs to have accurate extensions and all vestibules present
How much clearance is ideal b/t stock impression tray and tissues
5-6 mm
Periphery wax on trays
Change internal contour to ensure proper spacing b/t tray and tissues and gain additional flange extension
Leave impression unattended?
Never
How long til pour alginate impression?
Within 10 mins
3 goals of a final impression
Exact replica of hard/soft tissues
Max acceptable coverage of supporting tissues
Minimal extension into surrounding movable tissues/muscle attachments
Characteristics of correct impression tray
Material is rigid, stable
Easily adjusted
Not bulky
3 final impression techniques
Mucostatic
Functional
Selective pressure
Selective pressure vs. other 2 techniques
Light to moderate pressure on specific areas of arches, no pressure on other areas.
Mucostatic is minimal to no pressure
Functional is pressure to supporting structures
Primary vs. secondary vs. non-stress bearing areas
1/2 can take functional forces. Non can’t take forces. Selective pressure directs forces to functional areas
Feature of a completed denture that increases factors of retention
Max. Tissue coverage
Distal maxillary extent of complete denture
Vibrating line
Why is relief wax removed
Creates chamber to reduce chance of physical pressure from impression tray to non-stress bearing tissues
Why are holes cut into impression tray
Reduces hydraulic pressure
Location of post. Palatal seal
Vibrating line is posterior limit. Actual location depends on patient
How to minimize roll of tissue in masseter areas
Pull tissue from beneath while seating
Good impression material characteristics
Minimally viscous Polymerized intraorally within 2-3 mins Hydrophilic Thixotropic Doesn’t flow after removed Not excessively rigid Cheap Tolerated by tissues Exact in recording tissue details Poured in stone multiple times
Disadvantages of using modeling compound as border molding material
Need prep, more equipment/materials
Once cooled, it’s hard to place and remove from undercut areas
Why should max denture not be extended onto movable soft palate
Retention compromised
Irritation and trauma to movable tissues
What 8 things do a record base and an occlusion rim help with
Establishing facial contours tooth selection Establish/maintain vertical dimension Interocclusal records Arrangement of denture teeth Verification of correct mounting Esthetic trial insertion Waxup mold for ext. surface of denture
Characteristics of satisfactory record base (6)
Stable on casts and intraorally Rigid Accurately adapted to casts Comfy Esthetic Cover supporting tissues of arches
What is the exception to blocking out undercuts
Labial portion of maxillary cast since base can be placed and removed at an angle
Why is master cast soaked in water before making record base
Minimize formation of bubbles in completed record base
Why must care be taken when trimming record base with acrylic bur
Over reduction
Can warp with excessive heating
