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Article: Remodelling of periodontal tissues adjacent to sites treated according to the principles of guided tissue regeneration (GTR).

TitleRemodelling of periodontal tissues adjacent to sites treated according to the principles of guided tissue regeneration (GTR).
Authors
Issue Date1992
PublisherBlackwell Munksgaard. The Journal's web site is located at http://www.blackwellpublishing.com/journals/CPE
Citation
Journal Of Clinical Periodontology, 1992, v. 19 n. 9 Pt 1, p. 615-624 How to Cite?
AbstractThe aim of the present study was to assess the remodelling of alveolar bone adjacent to periodontal sites following therapy according to the principles of guided tissue regeneration (GTR) using computer-assisted densitometric image analysis (CADIA), and to compare the radiographic results to traditional clinical parameters. As required for digital subtraction analyses, periodically reproducible radiographs were obtained using a modification of the Rinn System and individual acrylic bite blocks for periodical identical radiographs. Ideally, a digital subtraction image from a site where absolutely no change in density had occurred would show a perfect cancellation of the structures. An average grey level value of 128 (the middle of the digitizer grey level range set by software) would show up at each pixel. Areas with grey levels < 128 in the subtraction image would indicate loss in density and grey levels > 128 would indicate increase in density. Within the subtraction images, areas were defined using the cursor to draw "regions of interest" (ROI) projected on the bony defect exposed to GTR covering the crestal bone as well as the region of potential "bonefill". The mean, median, the standard deviation and range of the grey levels of pixels within a particular ROI were calculated. Similarly sized ROI were drawn in bone areas not exposed to the GTR procedure serving as controls. The differences in the mean grey levels of all pixels within a particular ROI between the baseline, 3 and 12 months images were calculated for documentation of gain or loss in density. From 14 patients, standardized radiographs were available from baseline, 3 months and 12 months postsurgically, depicting one infraosseous defect before and after treatment according to the principles of GTR. The densitometric changes observed in these defects were compared to the clinically assessed changes measured at the site with the deepest baseline pocket depth. A mean clinical attachment gain of 2.36 mm after 3 and 3.22 mm after 12 months was measured. This was associated with a mean reduction in the PPD amounting to 3.36 mm and 3.79 mm, respectively. The changes in the level of the FGM were rather small considering the deep original mean PPD of 7.07 mm. Over the first months, a mean recession of 1.14 mm was observed which was followed by a coronal displacement of 0.43 mm. With respect to the remodelling of the alveolar bone adjacent to the defects assessed by means of CADIA, the most pronounced changes occurred when comparing the baseline to the 12 months radiographs.(ABSTRACT TRUNCATED AT 400 WORDS)
Persistent Identifierhttp://hdl.handle.net/10722/153799
ISSN
2015 Impact Factor: 3.915
2015 SCImago Journal Rankings: 1.848
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorBrägger, Uen_US
dc.contributor.authorHämmerle, CHen_US
dc.contributor.authorMombelli, Aen_US
dc.contributor.authorBürgin, Wen_US
dc.contributor.authorLang, NPen_US
dc.date.accessioned2012-08-08T08:21:38Z-
dc.date.available2012-08-08T08:21:38Z-
dc.date.issued1992en_US
dc.identifier.citationJournal Of Clinical Periodontology, 1992, v. 19 n. 9 Pt 1, p. 615-624en_US
dc.identifier.issn0303-6979en_US
dc.identifier.urihttp://hdl.handle.net/10722/153799-
dc.description.abstractThe aim of the present study was to assess the remodelling of alveolar bone adjacent to periodontal sites following therapy according to the principles of guided tissue regeneration (GTR) using computer-assisted densitometric image analysis (CADIA), and to compare the radiographic results to traditional clinical parameters. As required for digital subtraction analyses, periodically reproducible radiographs were obtained using a modification of the Rinn System and individual acrylic bite blocks for periodical identical radiographs. Ideally, a digital subtraction image from a site where absolutely no change in density had occurred would show a perfect cancellation of the structures. An average grey level value of 128 (the middle of the digitizer grey level range set by software) would show up at each pixel. Areas with grey levels < 128 in the subtraction image would indicate loss in density and grey levels > 128 would indicate increase in density. Within the subtraction images, areas were defined using the cursor to draw "regions of interest" (ROI) projected on the bony defect exposed to GTR covering the crestal bone as well as the region of potential "bonefill". The mean, median, the standard deviation and range of the grey levels of pixels within a particular ROI were calculated. Similarly sized ROI were drawn in bone areas not exposed to the GTR procedure serving as controls. The differences in the mean grey levels of all pixels within a particular ROI between the baseline, 3 and 12 months images were calculated for documentation of gain or loss in density. From 14 patients, standardized radiographs were available from baseline, 3 months and 12 months postsurgically, depicting one infraosseous defect before and after treatment according to the principles of GTR. The densitometric changes observed in these defects were compared to the clinically assessed changes measured at the site with the deepest baseline pocket depth. A mean clinical attachment gain of 2.36 mm after 3 and 3.22 mm after 12 months was measured. This was associated with a mean reduction in the PPD amounting to 3.36 mm and 3.79 mm, respectively. The changes in the level of the FGM were rather small considering the deep original mean PPD of 7.07 mm. Over the first months, a mean recession of 1.14 mm was observed which was followed by a coronal displacement of 0.43 mm. With respect to the remodelling of the alveolar bone adjacent to the defects assessed by means of CADIA, the most pronounced changes occurred when comparing the baseline to the 12 months radiographs.(ABSTRACT TRUNCATED AT 400 WORDS)en_US
dc.languageengen_US
dc.publisherBlackwell Munksgaard. The Journal's web site is located at http://www.blackwellpublishing.com/journals/CPEen_US
dc.relation.ispartofJournal of Clinical Periodontologyen_US
dc.subject.meshAbsorptiometry, Photonen_US
dc.subject.meshAlveolar Process - Physiopathology - Radiographyen_US
dc.subject.meshBone Remodeling - Physiologyen_US
dc.subject.meshDental Plaque Indexen_US
dc.subject.meshEpithelial Attachment - Pathology - Surgeryen_US
dc.subject.meshGingival Hemorrhage - Pathology - Surgeryen_US
dc.subject.meshGuided Tissue Regeneration, Periodontalen_US
dc.subject.meshHumansen_US
dc.subject.meshImage Processing, Computer-Assisteden_US
dc.subject.meshMembranes, Artificialen_US
dc.subject.meshPeriodontal Diseases - Physiopathology - Radiography - Surgeryen_US
dc.subject.meshPeriodontal Indexen_US
dc.subject.meshPeriodontal Pocket - Pathology - Radiography - Surgeryen_US
dc.subject.meshPolytetrafluoroethyleneen_US
dc.subject.meshRadiographic Image Enhancementen_US
dc.subject.meshSubtraction Techniqueen_US
dc.subject.meshTime Factorsen_US
dc.titleRemodelling of periodontal tissues adjacent to sites treated according to the principles of guided tissue regeneration (GTR).en_US
dc.typeArticleen_US
dc.identifier.emailLang, NP:nplang@hkucc.hku.hken_US
dc.identifier.authorityLang, NP=rp00031en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.pmid1430288-
dc.identifier.scopuseid_2-s2.0-0026931293en_US
dc.identifier.volume19en_US
dc.identifier.issue9 Pt 1en_US
dc.identifier.spage615en_US
dc.identifier.epage624en_US
dc.identifier.isiWOS:A1992JT98800002-
dc.publisher.placeDenmarken_US
dc.identifier.scopusauthoridBrägger, U=7005538598en_US
dc.identifier.scopusauthoridHämmerle, CH=7005331848en_US
dc.identifier.scopusauthoridMombelli, A=7006180872en_US
dc.identifier.scopusauthoridBürgin, W=7003413848en_US
dc.identifier.scopusauthoridLang, NP=7201577367en_US

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