Master models and die prep Question and answers already passed 2024/2025
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Course
DENTURES,DX AND TX PLANNING
Institution
DENTURES,DX AND TX PLANNING
Master models and die prep Question and answers already passed 2024/2025 Master models and die prep
Prosthondontic procedures
die
positive reproduction of the form of prepared tooth in any suitable subsance
definitive (working Master) casts
the replica of prepared teeth, ridge areas ...
Master models and die prep
Prosthondontic procedures
die
positive reproduction of the form of prepared tooth in any suitable subsance
definitive (working Master) casts
the replica of prepared teeth, ridge areas and other parts of the dental arch
steps of preparing final impression
Evaluate the impression before the procedure
No voids on the preparation, especially on the margin
No detach of impression material from the tray
trim lateral over-extension flush with custom tray
leave 5-8, vertical height from cervical margins of teeth
trim vertical over extension- create a flat surface parallel to tray base- occlusal
plane
,preparing final impression- typodont artifact
tyhphodont has large gingial embrasure
Preps for final impression- clip out interproximal areas on unprepared teeth
only
not on prepared teeth
facilitates pouring impression
strengthens cast, prevent fracture of tooth
boxing the impression- adapt boxing wax to periphery to ensure
adequate first pour thickness
add additoinal bowing wax if necessary
seal wax junctions with a hot #7 wax spatula,
sticky was can be used to assist sealing
seal boxing to internal border of impression material.
, wax adapted to tray- no gaps (this hold water)
pouring final impression: material choice
gypsum
epoxy resin
polymeric material (PVS)
dental gypsum products
alpha-hemihydrate- dental stone
beta-hemihydrate: plaster
gypsum product comparison
from type I to type V, water to powder ratio decreases, and therefore strength
increases.
type 4 max expansion is less than type V
type I
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