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Master models and die prep Question and answers already passed 2024/2025 $12.99   Add to cart

Exam (elaborations)

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 ...

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  • September 17, 2024
  • 22
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • DENTURES,DX AND TX PLANNING
  • DENTURES,DX AND TX PLANNING
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Academia199
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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