Mineralized Bacillus-Shaped Deposits Showing Numerous Bacterial Molds on the Surfaces in Deep Subgingival Calculus

Abstract

Mineralized bacillus-shaped deposits showing numerous bacterial molds on the surfaces were found in deep subgingival calculus with scanning electron microscopy, after the fractured surfaces were treated with NaOCl. Such structures may be derived from filamentous microorganisms attached with a large number of rod-shaped bacteria showing a 'bristle-brush' arrangement in subgingival plaque; namely, the filaments mineralized intracellularly, while the unmineralized rods dissolved with NaOCl treatment.