The most abundant fiber population within the periodontal ligament consists of_____________?
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Answer: C. Oblique
Explanation
Oblique fibers form the largest and most abundant principal fiber group within the human periodontal ligament. They extend obliquely in an occlusal direction from the cementum to the alveolar bone proper socket wall. This strategic orientation enables them to effectively absorb and resist heavy vertical masticatory forces during biting. The periodontal ligament consists mainly of collagen fiber bundles divided into alveolar crest, horizontal, oblique, apical, and interradicular groups. Oblique fibers account for roughly two-thirds of the total principal periodontal ligament fiber population. By transferring vertical chewing loads into tensile stress on the alveolar bone, they protect the root from crushing damage.
Trans-septal fibers run interproximally between adjacent teeth to maintain contact relationships, representing a smaller fiber population. Horizontal fibers run at right angles to the long axis of the root, resisting tipping movements rather than heavy vertical loads. Apical fibers radiate around the root apex, protecting against tipping and pulling forces rather than primary vertical support.
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