impression guide Flashcards
Which impression should be recorded first?
mandibular - easier for the pt to tolerate.
Pt positioning for the mandibular impression.
- pt sat upright with appropriate head support.
- chair raised so pt’s head is level with operator’s shoulder.
When taking a mandibular impression, how should the operator be positioned?
In front and to the side of the pt.
(8 o’clock position)
When taking a maxillary impression, how should the pt be positioned?
- upright with appropriate head support.
- chair is lowered as low as possible / level of operator’s elbow.
When taking a maxillary impression, where should the operator be positioned?
What should be used to record a lower complete impression if there is poor ridge form?
1st imps - silicone putty
2nd imps - heavy bodied silicone with a medium-light body wash once the heavy has set.
What must be included in the upper DBA impression?
- labial frenum
- incisive papilla
- buccal and lingual sulci
- rugea area
- palatine raphe
- tuberosity
- hamular notches
- palatine fovea
- vibrating line
What must be included in the lower DBA impression?
- retromolar pads
- mylohyoid ridge
- lingual sulcus
- buccal shelf
- lingual frenum
- buccal and lingual sulci
Which type of special tray should be asked for for alginate?
U - 3mm spacing with 3 tissue stops and a cranked handle.
L - 3mm spacing with 2 finger rests in the premolar region and a stubbed handle.
How much spacing would be required for ZOE?
0.5mm
What type of special tray should be used for PVS?
U - 1.5mm spacing, 3 tissue stops with a cranked handle.
L - 1.5mm spacing, 2 finger rests in the premolar region and a stub handle.
(ideally peripheries slightly under extended by 1mm).
