The apical border plaque in severe periodontitis. An ultrastructural study

Journal of Periodontology
T P VrahopoulosH N Newman

Abstract

This study concerns the apical border (AB) plaque in relation to severe forms of periodontitis (SP), including juvenile, post-juvenile, and rapidly progressing periodontitis. Twenty-four (24) teeth from 16 patients with SP were examined by transmission electron microscopy (TEM). The AB was not discrete, with islands of bacteria in the so-called plaque-free zone (PFZ). Coronal to the AB the established plaque consisted of a layer of Gram-positive cocci and ghost cells and a superficial layer mainly of Gram-negative morphotypes, including cocci, rods, filaments, fusiforms, and spirochetes. The most apical apparently intact organisms in the PFZ were in bacterial islands or in isolation and were predominantly Gram-negative cocci and rods, with ghost cells in abundance. Ruthenium red, alcian blue-lanthanum nitrate, and safranin O were used to label matrix polyanionic macromolecules, and periodic acid (thiosemicarbazide) silver proteinate for intracellular polysaccharide (IPS). The matrix components were mainly fibrillar. Many intact bacteria exhibited extracellular polysaccharides or glycocalyces associated with their cell wall, and cytoplasmic IPS granules. The latter varied in distribution and were evident even in the most apicall...Continue Reading

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Citations

Feb 3, 2005·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Wolf Dietrich KrautgartnerWalter Stoiber
Oct 21, 1998·International Dental Journal·H N Newman
Mar 17, 2004·Journal of Clinical Periodontology·S Aída Borges-YáñezGustavo Jiménez-García
Sep 28, 2007·Journal of Applied Microbiology·P SpencerA Flanagan
Aug 10, 2001·Journal of Periodontology·P WeidlichR V Oppermann
Sep 6, 2000·Journal of Periodontology·Y Noiri, S Ebisu
Aug 28, 2004·Periodontology 2000·Tatsuji Nishihara, Takeyoshi Koseki

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