|TorF? A flexible impression material is restricted to application in areas where no undercuts are present... ||False|
|Agar reversible hydrocollold ||water cooled trays|
|Alginate ||stock trays (perforated rim lock)|
|Rubber impression ||tripple tray, stock plastic|
|TorF? Air bubbles or voids on impressions will appear on model or cast... ||True|
|__________ is not an elastomeric impression material... ||Compound|
|When adhesive is placed in impression trays... ||holds material in place|
|TorF? Hotter room temp will lengthen the setting time... ||False|
|After removing alginate impression from the mouth operator should... ||rinse impression to remove saliva, blood, and debris|
|When taken final impression of abutment teeth for fixed bridgework, what materials may be used...
agar reversible hydrocolloid
|Alginate impression make a _____ mold... ||negative|
|Agar hydrocolloid impression material gels by circulating... ||cool water in tray|
|Although there is no adequate method of storing an impression obtained with hydrocolloid material, to help prevent dimensional change...
3 ||place in humidor
wrap in disinfected
pour impression immediately
|Syneresis means... ||loss of fluid|
|Proper method for removal OF hydrocolloid impression in order to minimize permanent detormation involves... ||removing with a snap|
|TorF? Elastrometric rubber impression material is used with water-cooled trays... ||False|
|The major disadvantage of impression obtained with hydrocolloid impression material is... ||lack of dimersional stability|
|TorF? Irreversible hydrocolloid impression material is most commonly used impression material for study models... ||True|
|Alginate is _____ hydrocolloid impression... ||Irreversible|
|Mixing alginate impression material , the use of cold water will... ||increase the setting time|
|TorF? Alginate powder cup should be overfilled and the powder pressed firmly into cup of compaction... ||False|
|TorF? Cotton rolls should be used to isolate the area prior to placement of the tray... ||False|
|"normal" or "regular" set alginate takes 10min to set mouth temp... ||False|
|When mixing alginate, excess water in the water powder ratio will cause...
3 ||decreased strength
longer setting time
|An interocclusal record may be accomplished with...
4 ||putty polyvinylsiloxane
rubber impression material
|Elastromeric impression materials are classified according to their viscosity. __________ viscosity is needed to record marginal detail after the removal of retaction cord... ||Low viscosity (syringe material)|
|A "hydrophyllic" polyvinylsiloxane impression material is advantageous because...
4 ||It is not adversely affected by contact with blood or saliva.
The material spreads evenly over moist surfaces (teeth) without developing voids in the final impression.
Marginal detail is improved.
Voids in the stone cast are reduced.
|Impression must be_________ before they are handled in the laboratory... ||Disinfected|
|Some rubber impression materials use a dispenser with a trigger-type handle and movable plunger that blends syringe base and catalyst. What type of syringe is this... ||Extruder gun system|
|The impression material that has the greatest dimensional stability after removal... ||Vinyl polsiloxanes|
|Final impressional, impression of opposing arch bite regristration is accomplished at the time the ____ ____(____ ______) technique... ||double arch (triple tray)|