Abstract
Sixteen intradental A-fiber units (cv 24.5±4.8 (SD)m/s) were identified with monopolar electrical stimulation of the dog's canine tooth. All of the units were activated by drilling and probing of dentine, 15 units by air blasts. Scanning electron microscopy of epoxy resin replicas and specimens of dentine showed that after acid etching of dentine, the apertures of dentinal tubules were open. Accordingly, nerve responses to probing and air blasts could be easily evoked. After drilling and resin or potassium oxalate impregnation, the apertures were partly or completely blocked and nerve responses were weak or totally absent. The results indicate that intradental A-fibers are responsible for dentine sensitivity. The responsiveness of these fibers can be affected by obstructing and opening the dentinal tubules.
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