The main function of horizontal fibres of P.D ligament is____________?
Correct answer: A. Maintains the mesiodistal width
- A. Maintains the mesiodistal width
- B. Prevent rotation
- C. Prevent extrusion
- D. All of the above
Explanation
Horizontal PDL fibres run at right angles from cementum to alveolar bone and resist horizontal displacement, helping preserve the tooth’s mesiodistal position. Prevention of extrusion is mainly associated with alveolar crest and oblique fibres.
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