Dental Materials OSCE

How do you know tooth enamel is etched properly?

a. surface is shiny

b. surface is frosted

c. surface stays the same

d. it does not matter what the surface looks like.

b. surface is frosted

Which of the following amalgam types require less condensation pressures and requires heavier wedging to establish contact?

a. admix

b. spherical

c. lathe-cut alloy

d. none of the above

b. spherical

What is the function of the bottom knob on the Tofflemire matrix retainer?

a. tightens and loosens the spindle within the diagnal slot.

b. increases or decreases the size of the matrix band loop.

c. holds the matrix band in position

d. all of the above.

b. increases or decreases the size of the matrix band loop.

How do you check for adequate occlusion after placement and finishing of the amalgams and composites?

a. the patient tells you

b. the dentist knows

c. through using articulating paper

d. with PIP paste

c. through the articulating paper

What type of curing light is used in our Dental Materials Lab for polymerizing light-cured materials?

a. Light Emitting Diode (LED)

b. Plasma Arc (PAC)

c. Quartz- Tungsten-halogen (QHT) d. Laser (argon laser)

a. Light Emitting Diode (LED)

After cavity preparation finished and before placing of composite restoration, you need to isolate the prepared area and moist tooth and check for _________________________.

a. occlusion

b. shade guide

c. rubber dam placement

d. none of the above

d. none of the above

What are the armamentarium for finishing and polishing amalgam restorations?

a. mouth mirror, dental explorer, perio probe, hemostate, contra angle

b. perio probe, mouth mirror, contra angle, plastic instrument, articulating paper

c. mouth mirror, dental explorer, finishing burs, contra angle, articulating paper

d. mouth mirror, finishing burs, perio probe, contra angle, plastic instrument

c. mouth mirror, dental explorer, finishing burs, contra angle, articulating paper

True or False

The diagonal slotted surface of the matrix band retainer is positioned away from the gingiva.

False

What class cavity restoration is a Tofflemire matrix band placed?

a. I

b. II

c. III

d. IV

b. II

The purposes of the placement of the wedge in class II cavity preparation (proximal embrasures) are ______

to prevent overhanging margins at the proximal area

This instrument is used to place a dental clamp onto the treatment tooth.

a. dental dam forceps

b. dental dam pliers

c. dental dam spacer

d. dental dam clamp gripper

a. dental damn forceps

What size of rubber dam material is used in our Dental Materials Lab?

a. 5 x 5 inch square. (anterior teeth and primary dentition)

b. 6 x 6 inch square. ( most common for posterior)

c. 4 x 4 inch square

d. None of the above

b. 6x6 inch square

Which clamp is used for isolation of the facial surfaces of anterior and some posterior teeth?

a. winged clamps

b. wingless clamps

c. butterfly-shaped clamps

d. bow clamp

c. butterfly-shaped clamps

True or False

In a class II cavity preparation the wedge is placed with the widest side towards the gingiva and placed buccal to lingual.

True

True or False

A contra angle is only placed on high speed hand pieces.

False

Before placing a sealant the tooth must be: a. free from plaque

b. free from decay

c. free from food debris

d. all of the above

d. all of the above

True or False

Sealant composites resemble flowable composites but have more viscosity to allow the material to stick to the pits and fissures.

False

Polishing of the amalgam restoration is best done:

a. at the time of placement of restoration

b. after finishing the amalgam restoration

c. 24 hours or longer after the initial placement

d. none of the above

c. 24 hours or longer after the initial placement

This instrument is used to smooth the restorative surfaces and margins:

a. carver

b. condenser

c. ball burnisher

d. plastic instrument

c. ball burnisher

True or False

Light cured materials harden as the result of a chemical reaction when the materials are mixed together.

False