| Root substance removal by scaling and root planing. | |
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MedLine Citation:
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PMID: 1765938 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The amount of root substance removed by scaling and root planing is largely unknown. The present study evaluated in vitro the root substance loss caused by a defined number of working strokes at known forces. Forty extracted teeth with loss of connective tissue attachment into the middle third of the roots were washed and embedded in plaster, leaving one entire corono-apical tooth aspect exposed. The teeth were reproducibly repositioned in a bench-vise, where a profilometer repeatedly measured root surface levels at the same location. In a standard area of the roots a total of 40 working strokes were applied. Low forces were used in 30 teeth and high forces in 10 teeth. The forces were recorded using a piezo-electric receiver built into the upper shank of the curet. Root substance loss was measured after 5, 10, 20, and 40 working strokes. The results showed that the mean low force used per working stroke across all 40 strokes was 3.04 Newtons for the low forces, and 8.48 Newtons for the high forces. Mean cumulative loss of root substance across 40 strokes was 148.7 microns at low forces, and 343.3 microns at high forces. The mean force per stroke increased slightly across the 40 strokes, while substance removal per stroke decreased. Substance removal per stroke during strokes 1 to 5 was 6.8 microns using low forces and 20.6 microns using high forces. During strokes 21 to 40 mean removal per stroke was 2.3 microns at low forces, and 5.6 microns at high forces. These results suggest that high forces remove more root substance, and loss per stroke becomes less with increasing numbers of strokes. |
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Authors:
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U Zappa; B Smith; C Simona; H Graf; D Case; W Kim |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of periodontology Volume: 62 ISSN: 0022-3492 ISO Abbreviation: J. Periodontol. Publication Date: 1991 Dec |
Date Detail:
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Created Date: 1992-02-18 Completed Date: 1992-02-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8000345 Medline TA: J Periodontol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 750-4 Citation Subset: D; IM |
Affiliation:
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Department of Periodontology, School of Dental Medicine, University of Bern, Switzerland. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Dental Scaling*
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methods Dental Stress Analysis Humans Multivariate Analysis Root Planing* / methods Stress, Mechanical Time Factors Tooth Root / pathology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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