impression

Question 1

what should the impression cover

Answer 1

remaining tooth structures, residual ridges, surrounding soft tissue

Question 2

Why is taking a custom tray better

Answer 2

allows better fit into the edentulous area, more accurate impression obtained, ensure material spreads evenly, saves amount of impression material used, can record functional form of lips, cheeks and tongue

Question 3

what materials can custom trays be made of

Answer 3

acrylic resin trays that are self cured or light cured, thermoplastic resin trays, impression compound tray

Question 4

How to make custom tray?

Answer 4

1. draw outline of cast 2. make spacer 3. make acrylic tray

Question 5

how much shorter than the sulcus should the labial/buccal and lingual tray be

Answer 5

2mm

Question 6

what is the posterior border of the upper tray demarcated by

Answer 6

a straight line between the hamular notch

Question 7

what should the thickness of the tray be

Answer 7

maxillary tray :1.5-2mm
mandibular tray: 2.5mm

Question 8

What type of material does mucostatic technique uses

Answer 8

low viscosity material, better fitting and retention at resting position

Question 9

what type of material does mucodisplacive technique use

Answer 9

heavy viscosity material, better stability during function, mucosal support denture