Dental: Chapter 46 test

1. 1An impression is a _____ reproduction of teeth and surrounding oral tissues, and the model created from the impression is a _____ reproduction of the structure.
   

   1. Aa. positive;positive
   2. Bb. positive; negative
   3. Cc. negative; positive
   4. Dd. negative; negative
2. 2The three classification of impressions in dentistry are:

   1. Aprospective, retrospective, and introspective.
   2. Bpreliminary, functional, and occlusal, or bite registration.
   3. Cpreliminary, final, and occlusal or bite registration.
   4. Ddiagnostic, functional, determinative.
3. 3A Preliminary impression would be used for:

   1. Acustom trays
   2. Bindirect restorations
   3. Cpartial or full dentures
   4. Dimplants
4. 4Final impressions are taken by the:

   1. Adentist
   2. Bdental hygnientist
   3. Cdental assistant
   4. Dlaboratory technician
5. 5The impression tray should be sufficiently deep to allow ____mm of material between the tray and the incisal or occlusal edges of the teeth.

   1. A0.5
   2. B2 to 3
   3. C6 to 8
   4. D10 to 12
6. 6Custom impression tray:

   1. Aare made from a preliminary model after the dentist has prepared the teeth.
   2. Bmay be constructed from resin.
   3. Care available only as full-arch trays
   4. Ddo not require adhesive if they are smooth surface.
7. 7The irreversible hydrocolloid material used most widely preliminary impressions is:

   1. Alight-bodied material
   2. Balginate
   3. Cpolysulfide
   4. Dpolyether
8. 8Most alginate impressions must be poured within ____ so that distortion does not occur.

   1. A5 minutes
   2. B30 minutes
   3. C1 hour
   4. D24 hours
9. 9If an alginate impression is stored in water or in soaked paper towel, the alginate will absorb the additional water expand. This property is called:

   1. Asyneresis
   2. Bimbibition
   3. Ctempering
   4. Dviscosity
10. 10A _____ tray covers of a dental arch.

    1. Afull-arch
    2. Bsection
    3. Cquadrant
    4. Dcustom

11. 11The length or depth of the alginate impression tray borders can be extended by adding ____ to the tray.

    1. Autility wax
    2. Bacrylic
    3. Cboxing wax
    4. Dborder molding compound
12. 12A(n) ____ is taken to produce a reproduction of the occlusal relationship of the maxillary and mandibular teeth when the mouth is occluded.

    1. Afinal impression
    2. Bpreliminary impression
    3. Cbite registration
    4. Darticulated impression
13. 13Which often following is an acceptable method for altering the setting time of alginate irreversible hydrocolloid impression material?

    1. AIncrease or decrease the water-to-powder ratio
    2. Bchange the water temperature
    3. CAdd a colloidal material to the alginate
    4. DUse potassium chloride as a accelerator
14. 14A(n) ____ impression material is used when an extremely accurate final impression is essential.

    1. Aelastomeric
    2. Balginate
    3. Creversible hydrocolloid
    4. Dlight-cured
15. 15Which type of elastomeric material has the highest viscosity?

    1. ALight-bodied
    2. BRegular-bodied
    3. CHeavy-bodied
    4. DPutty
16. 16Elastomeric impression materials are mixed by using:

    1. Aa paper pad and spatula.
    2. Ban automix system.
    3. Cmixing bowl and a spatula.
    4. Dboth a and b.
17. 17Which of the four types of elastomeric materials has best dimensional stability?

    1. APolysulfide
    2. BPolyether
    3. CCondensation silicone
    4. DPolysiloxane
18. 18Which of the following is the most durable material for occlusal bite registration?

    1. ASoftened baseplate wax
    2. BPolysiloxane bite registration paste
    3. CZinc oxide-eugenol (ZOE) bite registration paste
    4. DPolyether impression material
19. 19Which of the following is not considered a classification of impression materials?

    1. APreliminary
    2. BFinal
    3. CTemporary
    4. DOcclusal
20. 20Preliminary impressions are used to make:

    1. Adiagnostic models
    2. Bprovisional coverage
    3. Call of the above
21. 21Impression tray must be rigid enough to:

    1. Asupport the material in the patient's mouth.
    2. Bwarp the completed impression.
    3. Cboth a and b
    4. Dneither of above
22. 22The three curing stage are:

    1. Afirst impression, setting phase, final impression.
    2. Binitial set, final set, final cure.
    3. Cinitial impression, curing stage, final impression.
    4. Dfirst set, curing set, final set.
23. 23What is the purpose of the potassium alginate in impression alginate?

    1. ASlow set time
    2. BAdd bulk to material
    3. CAccelerate set time
    4. DThicken the material
24. 24How will a water temperature of 80 F affect an alginate mix?

    1. AIt will make the mix set faster.
    2. BIt will not change the setting time
    3. CIt will make mix set slower
    4. DIt will render it useless
25. 25Syneresis in an alginate impression occurs when:

    1. Awater evaporates from the impression
    2. Bthe mix changed colors
    3. Cexcess moisture is absorbed by the impression
    4. Dthe mixing time is increased
26. 26Alginate impressions may be disinfected by:

    1. Aspraying the alginate with glutaraldehyde
    2. Bsubmersion in disinfecting solution overnight.
    3. Cwetting with isopropyl alcohol
    4. Dspraying the alginate with an intermediate-level disinfectant
27. 27Alginate impression should be removed from the mouth by:

    1. Ausing gentle rocking movements.
    2. Busing one quick, snap-out motion.
    3. Cby twisting the tray sideways.
    4. Dusing a vigorous back forth action
28. 28The _____ portion of the maxillary tray should be seated in the mouth first.

    1. Aanterior
    2. Bposterior
    3. Cright side
    4. Dleft side
29. 29Alginate impression material can:

    1. Achange color as it sets
    2. Bbe normal set or fast set
    3. Cbe supplied with flavoring
    4. Dall of the above
30. 30Putting utility/rope wax on maxillary alginate tray will:

    1. Amaximize anatomical coverage of the posterior teeth
    2. Bmodify the tray to accommodate a high palate
    3. Cpermanently alter the impression tray
    4. Da and b only
    5. Eall of the above
31. 31When taking wax bite registration, the patient is directed to:

    1. Abite with the posterior teeth first
    2. Bclose normally and gently
    3. Cocclude with lateral movements
    4. Dbite with the anterior teeth first
32. 32The retromolar area, lingual frenum, tongue space, and mylohyoid ridge are reproduced in which impression?

    1. AMaxillary
    2. BMandibular
    3. CBoth a and b
    4. DNeither a nor b
33. 33Which positioning should the EFDA use while taking mandibular and maxillary impressions.

    1. AUpright
    2. BOperator
    3. CSubsupine
    4. DFour-handed dentistry
34. 34The atmosphere that is best for storing impressions is ___% relative humidity.

    1. A70
    2. B10
    3. C45
    4. D100
35. 35What may be done to alleviate the gag reflex when taking alginate impressions?

    1. AUse fast-set alginate, as it allows the impression tray to be removed from the mouth much sooner than if using normal set alginate.
    2. BDo not overload the posterior regions of the trays
    3. CHave the patients take deep breaths through the nose.
    4. DAll of the above
36. 36Alginate material not setting or setting too rapidly may be the result of:

    1. Aexpired shelf life
    2. Bhumidity
    3. Cimproper storage
    4. Dall of the above
37. 37Impression disinfection:

    1. Ashould be performed in the laboratory
    2. Bshould be performed before leaving the treatment area
    3. Cshould be performed wherever the assistant has the time
    4. Dis not necessary, provided the impression has been thoroughly rinsed
38. 38Impression inspection and evaluation include:

    1. Athe presence of the retromolar area and maxillary tuberosity
    2. Bsharp anatomical detail
    3. Ca surface free from voids
    4. Dall of the above
39. 39When loading a tray from an upper impression, place:

    1. Amore material toward the anterior and labial edge
    2. Bmore material in the palatal area
    3. Cthe material evenly in the tray
    4. Dmore material toward the posterior and palatal areas
40. 40Criteria for an acceptable alginate impression include all the following except:

    1. Afree of voids, air bubbles, and tears
    2. Banatomic area clearly defined
    3. Cperipheral borders clearly defined
    4. Dvoid of frena and tuberosities
41. 41Which type of reversible hydrocolloid material is the most viscous?

    1. ASyringe
    2. BPlate
    3. CHysteretic
    4. DTray
42. 42Which is not true regarding reversible hydrocolloids?

    1. APlastic stops are used during the impression
    2. BThe impression procedure require teh use of 3 conditioning baths for the material
    3. CThe material is 85% agar and 15% water
    4. DEither tray or syringe material can be used for the impression
43. 43What type of impression tray is required with reversible hydrocolloid impressions?

    1. APerforated
    2. BDisposable
    3. CWater-cooled
    4. DPlastic
44. 44Most of the elastomeric material used requires the use of a(n) ___ on the tray.

    1. Astop
    2. Bspacer
    3. Cadhesive
    4. Dlubricant
45. 45Although technique may vary, when assisting a dentist in taking an elastomeric impression, mix the light-bodied material first.

    1. ATrue
    2. BFalse
46. 46Elastomeric materials use an automix system; what does the extruder gun consist of?

    1. AA tube of catalyst and base of the same viscosity
    2. BA tube of light and heavy body material
    3. Ceither of the above
    4. Dneither of the above
47. 47Which is an advantage of an automix unit system for impression

    1. ANo mixing saves materials
    2. BIt increases productivity
    3. CLess time is spent on infection control
    4. Dall of theses are advantages
48. 48One of teh most popukar impression materials used for bite registartion is:

    1. Apolysulfide
    2. Bzinc oxide-eugenol (ZOE)
    3. Cpolysiloxane
    4. Dreversible hydrocolloid
49. 49If a more durable impression material is needed for bit registration, may be selected

    1. Apolysulfide
    2. Bzinc oxide-eugenol (ZOE)
    3. CPolysiloxane
    4. Dreversible hydrocolloid

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Quiz on Dental: Chapter 46 test , created by RAKARI FOSTER on 25/01/2018.

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RAKARI FOSTER

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