摘要:

AbstractThe effect of a 5‐day course of systemic metronidazole was investigated in 11 recall maintenance patients over a period of 3 months. Crevicular fluid flow, bleeding on probing, pocket depth, and composition of the subgingival microbiota as observed by dark‐field microscopy, were measured.The study design allowed patients to act as their own controls. At baseline 1 (day 0), each patient had a randomly assigned quadrant scaled and root‐planed, and received oral hygiene instruction. Microbiological and clinical parameters were measured at baseline 1 (before treatment) and at 3, 6, and 12 weeks in both the root‐planed and a designated no‐treatment quadrant. At baseline 2 (12 weeks), the contralateral quadrant was scaled and root‐planed, and the oral hygiene instruction was reinforced. At this appointment, each patient was given 15 metronidazole tablets (250 mg), 1 to be taken 3 times per day for 5 days. At the end of this period, patients were seen 1–2 h after taking their last tablet, and blood and crevicular fluid samples were taken lo determine the concentration of metronidazole by microbiological assay in the serum and crevicular fluid. Microbiological and clinical parameters were measucd at baseline 2 (before treatment) and at 13, 15, 18, and 24 weeks in both the root‐planed and designated non‐root‐planed (metronidazole only) quadrants.Results demonstrated, that in this group of recall maintenance patients, metronidazole was no more effective than root‐planing alone in reducing the relative % of total motile organisms and spirochetes in 5–8 mm pockets. Crevicular fluid flow was, however, significantly reduced for 11 weeks; serum and crevicular fluid levels of metronidazole were similar 1 to 2

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01357.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractDiagnosis of hone lesions on dental radiographs can be difficult due to the irregular trabecular pattern and subjectivity on the part of the observer. The purpose of this study is to improve the recognition of bone lesions by means of objective computer‐aided pattern recognition techniques. This article describes a method for the separation of teeth and bone regions in the image to facilitate further analysis, especially of the interdental bon

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01358.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractRadiography is an important tool in the diagnosis of periodontal bone lesions. Due to subjective factors in the interpretation by the observer, however, an error‐free diagnosis of bone lesions in an early stage is very difficult. The aim of this study was to reduce the influence of observer subjectivity by means of computer‐assisted image processing and pattern recognition in dental radiographs. The findings of the study show that periodontal lesions can be recognized and described in an objective way by means of digitized pattern recognit

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01359.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThe present study concerns an investigation carried out to determine the effects of gingival stimulation on the resolution of a human experimental gingivitis. 10 young male Dental students participated in the experiment. Following the baseline examination (day 0). the participants were instructed to abstain from all oral hygiene procedures during a 21‐day period. Heavy plaque accumulation and gingivitis developed during the 21‐day induction period. On the evening of the 21st day active oral hygiene measures were reinstitued, for an 8‐day period, using 2 different methods. For the left side of the maxillary arch, a hygiene procedure including gingival stimulation was prescribed. On the other hand, for the right side, a hygiene method without gingival stimulation was instituted. On both sides of the upper arch, the gingival condition was assessed by means of the gingival index and soft deposits were assessed by the plaque index (selected teeth: 13, 14, 15, 23, 24, 25). Measurements were performed on days 0, 21, 22, 23, 24, 25, 26, 27, 28, 29.On day 29, ideal oral hygiene conditions and gingival health were re‐established on both sides. However, a statistical analysis of the data collected during the recovery period revealed that gingival index scores were temporarily, but significantly, higher on the side where mechanical stimulation was performed, although plaque deposits there decreased more rapidly. Thus the present work supports the idea that gingival stimulation does not in any way improve recovery from experimental gin

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01360.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractRegenerative surgery of dog teeth with reduced periodontal support was undertaken to determine: (1) if new connective tissue attachment could be predictably attained back to the level of the cemento‐enamel junction; and (2) to what extent the new attachment would be accompanied by bone regeneration, root resorption, and ankylosis. The alveolar bone around mandibular premolars was surgically reduced up to 6 mm from the cementoenamel junction. The denuded root surfaces were exposed to the oral environment during a period of 3 months without plaque control. Regenerative surgery was then carried out employing citric acid root conditioning and coronally positioned flaps. 6 months later, histologic evaluation of the midbuccal and midlingual areas of mesial and distal roots revealed new attachment over extended portions of the root surfaces. In 9] of 120 available surfaces, there was no epithelial downgrowth apical to the cemento‐enamel junction. Bone regeneration varied from negligible amounts to complete reformation. However, root resorption and ankylosis were prevalent features. 2 different types of resorptions could be distinguished: those occurring near the cemento‐enamel junction (cervical resorption). and those occurring more apically in areas of newly formed bone (ankylosis‐associated resorption). Resorption of either or both types was noted for 92 of the 120 s

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01361.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThe aim of the present investigation was to find out to what extent the magnitudes of chewing and biting forces in dentitions restored with cross‐arch bilateral end abutment bridges are correlated to the areas of the periodontal ligament supporting the abutment teeth.12 subjects whose dentitions had been periodontally treated and prosthetically restored participated in the study.The chewing and biting forces were measured in various parts of as well as over the entire dentition simultaneously using 4 strain gauge transducers bilaterally placed in pontics of the posterior (first molar/second premolar) and anterior regions.Based on calculations of the periodontal ligament areas, a new periodontal support index. PSI1, is introduced. This index expresses the relation between the total remaining periodontal ligament area supporting the bridge abutments and total maximal periodontal ligament area if all teeth were preserved as abutments. It is compared with the index of Ante. PSIA, which expresses the relation between the total remaining periodontal ligament area of all abutments and the total maximal periodontal ligament area of all replaced teeth.Within the present group of subjects. PSILvaried from 10 to 44% and PSIAfrom 17 to 118%.Based on the results of the correlation analyses, it is suggested that in dentitions restored with cross‐arch bilateral end abutment bridges, the magnitude of thechewing forcesis positively correlated to the areas of the periodontal ligament supporting the bridge abutments, whereas the periodontal ligament areas have no influence on the comparatively largerbiting forces.The relevance of the 2 periodontal support indices and the clinical implications of the results of the study are discus

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01362.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThe purpose of the present study was to investigate the clinical differences between individuals highly susceptible and individuals insusceptible to periodontal breakdown. The susceptible group consisted of 7 patients with a diagnosis of juvenile periodontitis. The insusceptible group consisted of 7 individuals selected on the basis of age (52 years or older), presence of at least 18 teeth, no evidence of extractions due to periodontal breakdown, no loss of attachment, shallow pockets, gross amounts of plaque and no history of interdental cleaning. Results showed that the susceptible group had more bleeding, less plaque and deeper pockets than the insusceptible group. Since the 2 groups seem to behave differently with regard to bleeding upon probing and amount of plaque, bleeding plaque ratios were calculated. Testing showed a highly significant difference between the 2 groups. The same results were obtained if only sites with shallow pockets were included in the analysis. On the basis of these results, it is hypothesized that a high value of the ratio between bleeding and plaque may act as a prognostic indicator for periodontal breakdown.

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01363.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThe present clinical trial was performed to assess the effect of a Sanguinarine‐containing mouthrinse on developing plaque and gingivitis in man. The trial was designed as a blind cross‐over study. The active mouthrinse consisted of a 0.03% aqueous solution of Sanguinaria extract; an aqueous solution With similar color and taste as the active rinse was used as the placebo preparation. 14 dental students participated in the trial. At the start of each of 2 test phases, their gingival conditions were normal and their tooth surfaces free from dental plaque. Following a baseline examination, the participants refrained from mechanical tooth cleaning measures for 2 weeks. They rinsed twice daily with either the active or the placebo mouthrinse. Clinical examinations of plaque and gingivitis were repeated after 4, 7 and 14 days use of the mouthrinse preparation. During the second test phase of no mechanical tooth cleaning, the subjects who previously had rinsed with the placebo solution now used the active compound andvice versa.The results demonstrated that the Sanguinarine‐containing mouthrinse was effective in reducing plaque formation and retarding the development of gingi

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01364.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractIt is staled that in trials whereexperimental unitson different levels (sites, patients, etc.) are employed, the highest level unit should be used ascomputational unitwhen computing standard errors and in statistical inference. Using a lower level unit will underestimate the standard error and the level of significance (P‐value). A numerical illustration is presente

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01365.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractIn experiments where the treatment effect is denned as the change of a variable during treatment, one may. under certain circumstances, obtain a higher precision by basing the statistical analysis on the after‐treatment measurements alone instead of the change during treatment. The conditions for this are derived and an empirical illustration involving bacterial counts is presented. In the case of acrow‐over trialit is found in this particular case thatnotusing the base‐line measurements reduces the number of patients needed by approximately 40%, In the case of acompletely randomizeddesign, about the same precision is obtained whether or not one utilizes the base‐line

ISSN:0303-6979    

DOI:10.1111/j.1600-051X.1985.tb01366.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY