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Videoscope and Light Microscopy Analysis of Root Surface Microgrooves in Periodontal Disease
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Studies using the dental videoscope have identified so called “microgrooves” and “microislands of calculus” on root surfaces within periodontal defects. These grooves have been observed in vivo due to the visualization up to 60x and access of this novel instrument. Studies have identified a prevalence of 49-79% of these grooves in periodontal defects. The etiology and nature of these microgrooves have not been explored to this date. Teeth were collected from the undergraduate and graduate clinics that were deemed periodontally hopeless. These teeth were then lightly scaled and examined with the videoscope for microgrooves. Teeth were selected to be studied histologically to see the nature of the dentin and cemental interface of the grooves. Additionally, dried specimens collected previously in private practice, as well as non-periodontally involved teeth were observed. The control specimens were scaled with zero, one, or ten strokes to determine the effect of scaling upon the root surface., Microgrooves were found to be involved with changes of the cementum, including cellular cementum and reparative cementum. No major defects were found associated with the dentin, other than some darkening in one specimen, as well as evidence of external root resorption and cemental repair in another specimen. Based on the literature review, as well as the specimens studied, it is postulated that microgrooves are disturbances of the cementum, that may be associated with changes in the underlying dentin. They are believed to be associated with periodontal disease, and may be associated with occlusal discrepancies, gross anatomical characteristics, as well as iatrogenic root planing. They are believed to be distinct from Sharpey’s fibers attachment areas, and are possible precursors to cemental tears and dentinal fractures.
Wilson, John Brooks (2019). Videoscope and Light Microscopy Analysis of Root Surface Microgrooves in Periodontal Disease. Master's thesis, Texas A & M University. Available electronically from