NDAEB - National Dental Assisting Examination Board Clinical Support Procedures 2

Question 1

A dental assistant is preparing alginate for a mandibular full-arch impression. The mixed alginate appears grainy and sets faster than expected. Which error in technique is most likely responsible?

Accepted Answer

The water temperature was too warm, accelerating the set

Answer

Alginate is highly temperature-sensitive. Warm water accelerates the chemical reaction, shortening working time and producing a grainy, fast-setting mix. Cold water is used to extend working time when needed. Powder/water ratio errors affect consistency but not typically the speed of set in this way.

Question 2

A bitewing radiograph shows overlapping of the posterior interproximal contacts, making it impossible to assess for proximal caries. Which positioning error caused this?

Accepted Answer

Incorrect horizontal angulation — the beam was not directed through the contact points

Answer

Overlapping of interproximal contacts is caused by incorrect horizontal angulation. The X-ray beam must pass through the contact points at a precise 90-degree angle in the horizontal plane. Vertical angulation errors cause elongation or foreshortening, not overlapping.

Question 3

When placing a rubber dam, the dental assistant notices the dam is beginning to tear at the punched hole around the anchor clamp on tooth 3.6. What is the most appropriate immediate action?

Accepted Answer

Stop the procedure immediately, remove the dam, and replace it with a new one

Answer

A torn rubber dam must be replaced immediately. It no longer provides adequate isolation, compromising the sterile field and the quality of the procedure. More critically, fragments of a torn dam can be aspirated or swallowed by the patient, creating a safety hazard.

Question 4

During a posterior composite restoration, the dental assistant is positioning the high-volume evacuator (HVE). Which placement technique provides the best visibility and evacuation efficiency?

Accepted Answer

Place the HVE tip parallel to the tooth being treated, approximately 1–2 mm away on the opposite side from the handpiece bevel

Answer

The HVE tip should be placed parallel to the long axis of the tooth and approximately 1–2 mm from the site, on the side opposite the handpiece bevel. This position intercepts water and debris at the source, keeps the operative field clear, and avoids obstructing the operator's line of sight.

Question 5

A patient with a known history of asthma begins wheezing and reports chest tightness during a routine appointment. The procedure has been stopped and the patient is sitting upright. What is the dental team's first clinical action?

Accepted Answer

Assist the patient in using their own bronchodilator (rescue) inhaler

Answer

For a conscious asthma patient experiencing bronchospasm, the first action is to assist them in using their own prescribed bronchodilator inhaler, which rapidly relaxes bronchial smooth muscle. Oxygen and emergency services are indicated if the inhaler provides no relief or the patient deteriorates. A paper bag is used for hyperventilation, not bronchospasm.

(NDAEB) National Dental Assisting Examination Board Practice Test

(NDAEB) National Dental Assisting Examination Board Practice Test

NDAEB - National Dental Assisting Examination Board Clinical Support Procedures 2