Dental assistant expanded fuctions

Which of the following is NOT true when administering nitrous oxide/oxygen analgesia?
A)It should never be used in a concentration of greater than 50% nitrous oxide.
B)90+% of patients have an effective range of 30 -40% nitrous oxide
C)Routine use calls for a concentration of 30-40% nitrous oxide
D)It is seldom effective below a 25% concentration of nitrous oxide E)It is most effective when used in a concentration of greater than 50% nitrous oxide

E) It is most effective when used in a concentration of greater than 50% nitrous oxide

The purpose of the facebow transfer is to _____

allow mounting the upper cast in the correct anatomical position .

The advantage of a periodontal dressing _____

Easy to place ,pliable ,comfortable ,smooth surface , acceptable taste ,and easily removable

The face bow aids the laboratory technician by establishing the ____

incisal plane and the arc of closure.

All of the following are criteria for taking an alginate impression for a denture repair EXCEPT
A ) index the denture (piece it together)
B)go up one size in tray selection
C)mix alginate to a thinner than normal consistency
D)overfill alginate in the tray

D)overfill alginate in the tray

In a normal impression, how much clearance should there be between the tray and the teeth?

1/4 inch

Which of the following are contraindications for the use of nitrous oxide /oxygen analgesia EXCEPT
A. Upper respiratory infection
B. first trimester of pregnancy
C. chronic obstructive pulmonary disease
D. eustachian tube blockage
E. all of the above

E. All of the above

All of the following are indications of clinically correct dosage of nitrous oxide/oxygen analgesia EXCEPT
A .excitement
B. mild diaphoresis
C. slow ,regular, and deep breathing
D.loss of facial expression and open mouth
E. Hand relaxation and a fixed stare

A .excitement

All of the following are indications of symptomatic excessive dosage of nitrous oxide/oxygen analgesia EXCEPT
A. nausea
B .uncontrolled spinning
C. distortion of sensation
D.mild euphoria and hearing alteration

D. mild euphoria and hearing alteration

All of the following are effective sources of fluoride EXCEPT
A. drinking water
B. toothpastes
C. Food
D. air
E. lozenges

D. air

The most commonly accepted theory regarding dentinal hypersensitivity is ______

the hyprodynamic mechanism

Liners should be placed _____

as an indirect pulp cap and placed in the shallowest area of excaration and with at lest 1mm or more of thickness.

Bases should be placed ___

on the pulpal and axial walls in the deepest area of the prep.

The first step in delivering TMJ appliances is to try it in for fit. If retention is poor, or if there is a small rock ,you would____

reline the appliance with a thin mix of acrylic.

When you have completed your adjustments on the TMJ appliance ,you
A.dismiss the patient
B.reappoint the patient for a follow up visit with the doctor
C. have the doctor make the final adjustments
D.clean up the treatment room

C. have the doctor make the final adjustments

Which of the following is NOT a prerequisite for final crown and bridge impressions?
A.clean ,dry field
B.salivary control
C. Hemostasis
D.inflamed tissue

D.inflamed tissue

The ideal concentration of fluoride in the water supply is?

1.0 PPM

Systemic fluoride is primarily effective because ____

It is absorbed by the digestive tract , and incorporated into the enamel matrix during tooth formation .

Fluoride supplements should NOT be prescribed when a patient ___

has no decay and has fluridated water.

Which of the following criteria is used in the selection of teeth to be sealed?
A.Previously unrestored teeth
B.age of the teeth sine eruption
C.no visual or radiographic evidence of interproximal caries.
D.deep pits and fissures in a caries active individual
E. all of the above

E. all of the above

_____ seals the dentinal tubules, enamel prisms ,and margins of a crown prep.

Copalite

A liner should cover the _____only and never cover the _____.

DENTIN /enamel

Which of the following should NOT be used beneath a composite restoration ?
A . Copalite
B .Zinc Oxide Eugenol
C. Glass ionomer
D.A and B
E. B and C

D. a and b

Which of the following liners or bases in cariostatic in nature?
A.Zinc oxide eugenol
B.Glass ionomer
C. calcium hydroxide
D. zinc phosphate

B.Glass ionomer

Which of the following liners or bases in cariostatic in nature?

A.zinc oxide eugenol
B. glass ionomer
C.calcium hydroxide
D. zinc phosphate

B. glass ionomer

The etching of enamel was reported by ___in 1955

Buonocore

The removal of the smear layer is accomplished by the application of _____

an etchant.

Which of the following is NOT a method of tissue retraction for crown and bridge impressions ?
A.mechanical
B.mechanochemical
C.mechanosurgical
D.surgical

C. mechanosurgical

When you place retraction cord, you do NOT_____

place the dry cord and keep it dry for ease of removal

All of the following are contraindications to the use of retraction cords containing epinephrine EXCEPT
A. type of impression material
B.cardiovascular disease
C.hyperthyroidism
D. known hypersensitivity to epinephrine

A. type of impression material

Criteria for choosing a material for temporary crowns should include what?
A compatible with the tooth and soft tissue
B. easy to seat and remove
C. inexpensive
D. easy to use
E. all of the above

E. all of the above

Requirements of an excellent temporary restoration includes all of the following EXCEPT
A. anatomical contour
B. interproximal contacts
C.secondary anatomy on the occlusal
D.proper occlusal contact
E.esthetically pleasing and complete coverage of prep

C.secondary anatomy on the occlusal

The soft tissue should be well lubricated when fabricating a custom provisional to avoid injury from what?

Heat of the chemical reaction and free liquid chemical burns

The teeth which routinely have the greatest need for dental sealants are the

upper and lower permanent molars.

The most common cause of failure of a sealant is______

lack of training by the operator.

Localized osteitis is caused by_______

loss of the blood clot due to drinking through a straw, expectorating or smoking.

Which of the following has the greatest incidence of osteitis?

A. maxillary 3rd molars extraction in a non-smoker
B .mandibular 3rd molars extraction in a smoker
c. mandibular 3rd molars extraction in a non-smoker
D. maxillary 3rd molars extraction in a smoker

B. mandibular 3rd molars extraction in a smoker

Etching for ____seconds with 37% phosphoric acid will etch 8-10 microns of dentin

10

______is/are applied to all cavity walls and margins and over bases.

Copalite or cavity varnishes

Liners interfere with the bonding of composites. T/F

True

Desensitizers are applied in clinical practice for____

dentinal hypersensitivity.

When providing an in-office bleaching, a rubber dam is placed in most cases to___

protect the gingiva from chemical burns.

The most common site for dentin hypersensitivity is____

maxillary first molar.

A proper impression from which you are to fabricate a TMJ or bruxism appliance should.

A. be loose in the impression tray
B. be poured immediately or stored in humidor
C.be wrapped in a paper towel and sent to the lab
D. have bubbles on occlusal surfaces to allow space for acrylic shrinkage
E. contain occlusal and axial detail
F.have no voids

B. be poured immediately or stored in humidor
E. contain occlusal and axial detail
F.have no voids

The reason(s) for packing a localized osteitis is to
A)provide a local obtundent for pain
B)keep food and debris out
C)provide a bad taste to dissuade patients from eating
D.insure that the patient returns to the office for follow up treatment

A)provide a local obtundent for pain
B)keep food and debris out

Which of the following is NOT an indication for bleaching of teeth?
A.teeth darkened by aging
B.teeth yellow from birth
C.teeth malformed from birth
D.teeth with chromogenic stains
E.teeth with nicotine stains
F.teeth with drug-induced stains
G.teeth with trauma-induced darkness H.teeth stained from enamel fluorosis

C.teeth malformed from birth