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materials quiz

materials

QuestionAnswer
what are the 3 classifications of impressions used in dentistry? preliminary, final, and occlusal or bite registration
why would a dentist request preliminary impressions? to fabricate custom trays
legally, who can take final impressions? dentist
an impression tray should be sufficiently deep to allow ______ of material between the tray and the incised or occlusal edges of the teeth. 2 to 3 mm
which statement is correct regarding custom impression trays? they can be constructed from resin
which irreversible hydrocolloid material is used most widely for preliminary impressions? alginate
alginate impressions must be poured within _____ so the distortion does not occur. 1 hour
what term is used when an alginate impression takes up water either from soaking or wrapping in a wet paper towel? (absorbed, swollen, expanded from to much water) imbibition
which type of impression tray covers the anterior portion of the dental arch? section
which of the following is utilized to extend the length or depth of the borders of an alginate impression tray? utility wax
which type of impression is taken to produce a reproduction of the occlusal relationship of the maxilla and mandible teeth when in centric occlusion? bite registration
which of the following is an acceptable method for altering the setting time of alginate irreversible hydrocolloid impression material? change the water temperature
which impression material is used when an extremely accurate final impression is essential? elastomeric
which type of elastomeric material has the highest viscosity? putty
how are elastomeric impression materials mixed? a paper pad and spatula and with an auto mix system
which of the four types of elastomeric materials has the best dimensional stability? polysiloxane
which material is the most durable for occlusal bite registrations? zinc oxide-eugenol (ZOE)
which of the following classifications of impression materials can also be referred to as bite registration? occlusal
what are preliminary impressions used to make? diagnostic models, provisional coverage, and orthodontic appliances
impression trays are rigid for all of the following reasons except to? warp the completed impression
what are the three curing stages of impression materials? initial set, final set, final cure
what is the purpose of the calcium sulfate in impression alginate? it reacts with potassium alginate to form the gel
how will a water temperature of 80 degrees affect an alginate mix? it will make the mix set faster
alginate storage life 1 year
out in the open air, dry, SHRINK/SHRUNK syneresis
2 types of settings Fast set and Normal
how is an alginate impression disinfected? spray the alginate with an intermediate-level disinfectant
how are alginate impressions removed from the mouth? use one quick, snap-out motion
which portion of the maxillary impression tray should be seated in the mouth first? posterior
what is the working time of normal-set alginate impression material? 2 minutes
what position should the EFDA use while taking mandibular and maxillary impressions? operator
what can be done to alleviate the gag reflex when taking alginate impressions? use fast-set alginate , because it allows the impression tray to be removed from the mouth much sooner than using normal set alginate.
which type of reversible hydrocolloid material is the most viscous? tray
how is a stock impression tray prepared for an elastomeric impression? coated with adhesive
Created by: Krijar1165
 

 



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