dental assistant, dental hygienist

1 Two red vertical lines drawn between the upper central incisors on a patient chart would indicate:

a. Extraction of a mesiodens

b. Diastema

c. Drifting

d. Fixed bridge

Incorrect. Please choose another answer.

Diastema - a space between the upper central incisors

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2 What is added to an anesthetic agent to lengthen the effect by decreasing blood flow?

a. Vasoconstrictors

b. Vasodilators

c. Lidocaine

d. Septocaine

Incorrect. Please choose another answer.

Vasoconstrictors act by constricting the blood vessels thereby decreasing blood flow in the area and lengthening the amount of time that the local anesthetic is active in that location.

3 Which of the following are the most frequently injured primary teeth?

a. Maxillary central incisors

b. Mandibular central incisors

c. Maxillary central and lateral incisors

d. Mandibular central and lateral incisors

Incorrect. Please choose another answer.

Maxillary central incisors are the most frequently injured primary teeth.

4 In which of the following situations should utility gloves be worn?

a. X-ray processing

b. Instrument sterilization

c. Patient examination

d. None of the above

Incorrect. Please choose another answer.

Utility gloves should be worn during instrument sterilization.

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5 What is the recommended size of x-ray beams, which are targeted toward the patient's face for dental radiographs?

a. 2"

b. 3"

c. 2.75"

d. 3.75"

Incorrect. Please choose another answer.

2.75" is the appropriate and recommended size of x-ray beams that are to be targeted toward a patient's face during dental radiographs.

6 Decalcification and demineralization of tooth enamel begins at what pH?

a. 3.3

b. 5.5

c. 6.6

d. 7.7

Incorrect. Please choose another answer.

5.5 pH is the acidic level at which decalcification and demineralization of tooth enamel begins to occur.

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7 Wedge-shaped lesions along the cervical margin of the teeth are referred to as _________.

a. Erosion

b. Abrasion

c. Abfraction

d. Attrition

Incorrect. Please choose another answer.

Abfractions are the wedge-shaped lesion along the cervical margin of the teeth, usually due to fatigue or flexing of the tooth. The excess flexing causes enamel to chip off of the tooth in this area, exposing the dentin.

8 Which type of pocket is generated by an apical migration of the junctional epithelium?

a. Periodontal

b. Gingival

c. Suprabony

d. False

Incorrect. Please choose another answer.

Periodontal pockets are the result of loss of junctional epithelium in an apical direction, indicative of bone loss.

9 What type of cement is widely used in dentistry for bonding, temporary fillings and temporary cement?

a. Glass ionomer

b. Zinc phosphate

c. Zinc polycarboxylate

d. Zinc oxide and eugenol

Incorrect. Please choose another answer.

Zinc oxide and eugenol cement is widely used in dentistry and has many purposes including impressions, temporary cement or fillings, bonding and even periodontal dressing.

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10 What is the ideal angle of instrumentation for calculus removal?

a. 60-80 degrees

b. 0-40 degrees

c. 20-50 degrees

d. 40-60 degrees

Incorrect. Please choose another answer.

60-80 degrees is ideal for calculus removal. This angulation is in regards to the face of the instrument to the tooth.

Dental Assistant / Hygienist Practice Test