Special Trays Flashcards
0
Q
Dentate trays must be…
A
Upper handle 45 degrees at incisal edge in midline
Lower handle 10 degrees lower incisal edge and midline
Finger rests in premolar region
1
Q
What are the principles of special trays?
A
Tray must be rigid Correctly angled handles Correct spacing for impression material Periphery 2mm short of sulcus depth Sufficient relief for fraene Spaced tray for alginate Consider perforation
2
Q
Trays for edentulous must be…
A
Upper: handle at 45 degrees over crest of ridge in midline
Lower: 10’degress over crest of ridge in midline
Consider finger rests in premolar region
3
Q
What material is used to make the special tray?
A
Special tray light cured wafer material
4
Q
What are the components of the special tray material?
A
TEDma UDMA Pyrogenic silica Glass filler Pigments Additives Catalysts Vynilic ester resin.
5
Q
What are the properties of the light cured spiral ray material?
A
Transverse stengh of 80Mpa Economical Easy to manipulate Good working time Stable Quick setting time with light Shelf lire of three years
6
Q
What are the uses for special tray light cured material?
A
CCON Complete and partial special tray Creating undercuts on teeth Occlusal rim and try in base plates Neutral zone baseplate
