PDL Fibre Groups — NDEB AFK MCQ
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Correct answer: E — Oblique fibres
The oblique fibres are the most numerous fibre group of the periodontal ligament, comprising approximately 60-70% of PDL fibres. They run from the cementum in a coronal direction to the alveolar bone (obliquely), converting occlusal compressive forces into tensile forces on the alveolar bone. This arrangement is analogous to a hammock and provides the primary resistance to intrusive (axial) forces. Alveolar crest fibres resist lateral forces and tilting.
Reference: Nanci – Ten Cate's Oral Histology, 9th ed., 2017