Dental midterm - Fall 2026

Posterior teeth

Are the teeth posterior to the canines

The four first permanent molars are

3, 14, 19, and 30

The maxilla is the bone which

Contains the upper teeth

The TMJ (temporomandibular joint) is the

Joint which allows the lower jaw to move

The most common bacteria in the mouth and the one most responsible for tooth decay is:

S. mutans

The first sign of periodontal disease is:

Bleeding gums

Among the many OSHA regulations which must be followed in a dental practice include

all of the above

The branch of dentistry which treats infections within the pulp canal (root) is:

Endodontics

In general, the needles used to inject local anesthesia are

Blue for upper teeth and yellow for lower teeth

The items needed for rubber dam placement are:

Clamp forceps, clamp, frame, rubber dam, hole punch, floss

In the photo at the right, the usual transfer zone to pass instruments is:

The 4-7 o’clock position (over the bib)

The rule of thumb for the HVE (suction) by the assistant is to have the bevel or opening of the suction tube:

Facing the tooth being prepared

Following treatment, high and low speed handpieces must be:

Oiled, if recommended, and autoclaved

Floss is placed (tied) on the rubber dam clamp:

To aid in the retrieval of the clamp should it fall off the tooth

An autoclave sterilizer (pick the best)

A. Uses steam pressure and heat to kill germs

The Statim autoclave is popular in many dental offices because

The cycle is much faster than regular autoclaves

A rubber dam clamp used for bicuspids is:

2A

Whenever using the air-water syringe, the assistant should

also have the HVE suction close to the tooth

The x-ray tube inside a dental x-ray machine operates in the voltage range of

70,000 to 90,000 volts

In the x-ray control panel at right, the button for setting the machine for a lower molar is:

‘A’

If it is the office policy to use a lead apron on a patient for dental x-rays, the correct procedure for doing so is:

Put the apron on the patient, wash hands, glove up, take the x-rays

The Rinn holder at right is assembled correctly for taking x-rays in the

Upper right and lower left quadrant

The sensor for taking digital x-rays

Costs from $6000 to $8000

When the angle of the x-ray beam is positioned as shown here

Shorter than the actual teeth

While the primary advantage of a panoramic x-ray that it is quick, the main disadvantage over an FMX is that a panoramic x-ray:

Isn’t as sharp as an FMX

The x-ray technique(s) used in dentistry are the

A. B and C

A periapical x-ray of tooth #3 is taken by positioning the x-ray head:

At a downward angle on the patients right side

The correct sequence of treatment in light-cured composite fillings is:

Etching, bonding, cure, composite placement, cure, polish

The plastic instrument is

Used for composite placement

Sectional matrix bands as shown here are sometimes preferred over traditional Tofflemire matrix bands because the sectional matrix

Makes a tighter contact between the teeth

When polishing composites, the sanding discs are secured to the lowspeed handpiece using a:

Mandrel

To help secure a matrix band to the tooth in composite procedures a _____ is sometimes used.

Wooden wedege

An alginate impression

Should be poured immediately or wrapped in a wet paper towel

Using a vibrator is necessary when pouring up plaster models because:

It removes the air bubbles trapped in the plaster

Sealants applied to children’s and adolescent’s teeth

All of the above

The instrument at the right is

A Tofflemire matrix band holder

Permanent crown and bridge, power-liquid cements should be mixed

Very quickly on a disposable mixing pad if desired

One of the permanent, modern cements for cementing crowns is:

RMGI cement, resin-modified glass ionomer cement (RelyX)

Match restoration with the cement commonly used for each: Acrylic (plastic) temporary

Temp bond

Match restoration with the cement commonly used for each: Metal shell temporary

IRM

Match restoration with the cement commonly used for each: Permanent crown

RMGI or Zinc phosphate cement

The jaw position (maxilla to mandible) shown at right is

Class II

Orthodontic brackets (right) are attached (cemented) to teeth using

Composite type (bonding) cement

During orthodontic treatment, the specific hardware that does most of the work to straighten the teeth is:

The wire

The main advantage of the modern cement types, like RMGI (RelyX) and all-resin cements, is:

The are insoluble (don’t wash out) in oral fluids

Identify (#) tooth shown on x-ray:

20

Identify (#) tooth shown on x-ray:

3

Identify (#) tooth shown on x-ray:

8

Identify (#) tooth shown on x-ray:

29

Identify (#) tooth shown on x-ray:

24