Periodontal Ligament

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Questions and Answers

What is the thickness range of the periodontal ligament space in humans?

0.20 to 0.50 mm
0.15 to 0.38 mm (correct)
0.40 to 0.60 mm
0.10 to 0.30 mm

What appears as a radiolucent area between the radiopaque lamina dura and the radiopaque cementum on radiographs?

Periodontal ligament (correct)
Dental pulp
Alveolar bone proper
Gingiva

Which cells are NOT found in the periodontal ligament?

Fibroblasts
Osteoblasts (correct)
Epithelial cell rests of Malassez
Inflammatory cells

What is the PDL continuous with at the apical foramen?

<p>Dental pulp (B)</p> Signup and view all the answers

Which term was previously used for the periodontal ligament?

<p>"Desmodont" (C)</p> Signup and view all the answers

Flashcards

Periodontal Ligament Space Thickness

The periodontal ligament space in humans ranges from 0.15 to 0.38 millimeters.

Radiolucent Appearance

The periodontal ligament appears as a radiolucent (dark) area on dental X-rays between the lamina dura (the outer layer of the tooth socket) and the cementum (the outer layer of the tooth root).

Cells NOT Found in PDL

Osteoblasts, which are responsible for bone formation, are not found within the periodontal ligament. Osteoclasts and cementoblasts are present.

PDL Continuity at Apical Foramen

The periodontal ligament connects directly to the dental pulp at the apical foramen, the opening at the tip of the tooth root.

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Previous Name for Periodontal Ligament

The periodontal ligament was previously referred to as the 'desmodont,' which means 'tooth-binding'.

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Study Notes

Periodontal Ligament Characteristics

The thickness range of the periodontal ligament (PDL) space in humans is 0.15-0.38 mm.
The PDL appears as a radiolucent area between the radiopaque lamina dura and the radiopaque cementum on radiographs.