DDS Periodontics

Question 1

Which fibers of the periodontal ligament embed directly into the cementum and alveolar bone?

Accepted Answer

Sharpey's fibers

Answer

Sharpey's fibers are the terminal portions of principal periodontal ligament fibers that insert into cementum and alveolar bone, anchoring the tooth in its socket.

Question 2

What is the accepted normal sulcus probing depth in a clinically healthy periodontium?

Accepted Answer

1–3 mm

Answer

A healthy gingival sulcus measures 1–3 mm on probing; depths ≥4 mm indicate pathological pocket formation.

Question 3

In a healthy periodontium, the apical termination of the junctional epithelium coincides with the:

Accepted Answer

Cemento-enamel junction (CEJ)

Answer

Under healthy conditions, the apical end of the junctional epithelium is located at the CEJ, with no apical migration onto the root surface.

Question 4

According to Hamp's furcation classification, Class II involvement is defined as:

Accepted Answer

Horizontal loss exceeding one-third the width but not encompassing the total width

Answer

Hamp Class II means the probe penetrates horizontally more than one-third the tooth width but cannot pass completely through the furcation.

Question 5

The 'biologic width' of the periodontium comprises which two structures?

Accepted Answer

Junctional epithelium and supracrestal connective tissue attachment

Answer

Biologic width (~2 mm) consists of the junctional epithelium (~1 mm) and the supracrestal connective tissue attachment (~1 mm); violations cause chronic inflammation.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Periodontics