Abstract
A modified Mallory staining technique applied to serial mesio-distal sections of various regions of the human dentition showed numerous transalveolar fibres passing without interruption from the periodontal ligament through the entire thickness of the bony wall of the surrounding alveolus. These transalveolar fibres were observed only in regions of lamellated bone, lacking Haversian systems. They were never seen traversing an Haversian system. The fibres joined roots of adjacent teeth or of the same tooth to each other, or they were attached to the periosteum of the alveolar process or to the lamina propria on gingival surfaces. It is proposed that the orientation and distribution of transalveolar fibres represent a functional adaptation to occlusal forces.
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