A Scanning Electron Microscopic Observation of Attrition of Deciduous Teeth

Abstract

1. On the attrited enamel surface of deciduous teeth, many striations running irregularly were observed. Fissures, furrows, flanked pits, and defects also were observed. Where steps were formed, cut ends of enamel rods were found. A thin membrane of thin organic fibrous materials and bacteria covered the surface. 2. On the attrited surface of dentin of deciduous teeth, dentinal tubules showed openings of various sizes from large to small in diameter and were obliterated completely or partially. The surface was covered with attachments of matrix fibers and bacteria. 3. On the longitudinal surface of sclerotic dentin at attrited sites, the interior of dentinal tubules was occupied by ruptured processes of odontoblasts, collagen fibers, and bacterium-like substances. Most crystals were aggregations of rhombic crystals.