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Chronic Periodontitis Patients (chronic + periodontitis_patient)
Selected AbstractsTooth extraction decision model in periodontitis patientsCLINICAL ORAL IMPLANTS RESEARCH, Issue 1 2010A. Popelut Abstract Objective: The purpose of this study was to build, around several types of input data, a decision analysis model for dental extraction strategy in periodontitis patients. Materials and methods: The decision analysis was based on the following scenario: a fictitious adult chronic periodontitis patient with no chief complaint, being referred to make a decision of extraction on one single tooth presenting a periodontal defect that may affect the decision-making process. A decision tree was used to identify the treatment options within the next 5 years. Scientific evidences were based on probabilities given by a literature analysis using a systematic approach. Clinical expertize was based on subjective utilities (SUs) assigned by an experts' panel. Expected utilities (EUs) were used to rank the following options: no treatment (EU1) or periodontal treatment (EU2); extraction followed by a tooth-supported fixed partial denture , FPD , (EU3) or an implant-supported single crown , ISC , (EU4). Results: The robustness analysis calculation indicates that the probability of tooth survival needed to be equal to 0.78 in order that the passive option becomes optimal. However, EU1 was impossible to calculate due to the lack of available probabilities. The EU intervals were 79,96, 86,89 and 94,95 for EU2, EU3 and EU4, respectively. Consequently, the FPD option is dominated by the ISC option, and it is not possible to conclude to a difference between the periodontal and the ISC therapy. Conclusions: Within the limits of this model, tooth extraction followed by FPD is the worst strategy compared with ISC or periodontal therapies. To cite this article: Popelut A, Rousval B, Fromentin O, Feghali M, Mora F, Bouchard P. Tooth extraction decision model in periodontitis patients. Clin Oral Impl Res. 21, 2010; 80,89. [source] Post-treatment effects of subantimicrobial dose doxycycline on clinical parameters and gingival crevicular fluid transforming growth factor-,1 in severe, generalized chronic periodontitisINTERNATIONAL JOURNAL OF DENTAL HYGIENE, Issue 2 2008A Gürkan Abstract:, Objective:, Present study aimed to evaluate the effect of 3-month adjunctive subantimicrobial dose doxycycline (SDD) on clinical parameters and gingival crevicular fluid (GCF) transforming growth factor-beta1 (TGF-,1) levels in chronic periodontitis patients over 12 months. Methods:, Thirty-five patients with severe, generalized periodontitis participated in the present randomized, placebo-controlled study. Patients received scaling and root planing (SRP) plus 3 months adjunctive SDD or placebo. Clinical measurements and GCF sampling were performed at baseline, 3, 6, 9 and 12 months. Eleven periodontally healthy subjects served as controls for GCF TGF-,1 analysis. Results:, Clinical parameters of both SDD and placebo groups significantly improved during the study (P < 0.0125). SDD group exhibited significantly higher PD reduction at deep sites (baseline PD ,7 mm) compared with placebo group at 6 months (P < 0.05). In SDD group significantly higher percentage of deep pockets resolved (PD reduction ,3 mm from baseline) when compared with placebo group at 6 and 9 months (73.4% versus 49.7%; 79.9% versus 50.6%, respectively, P < 0.05). PD reduction ,4 mm for deep pockets from baseline was also greater in SDD group than placebo at 6 months (53.4% versus 36.3%, P < 0.05). GCF TGF-,1 levels of SDD group was significantly higher than baseline (P < 0.0125) and placebo group (P < 0.017) at 3 months. Conclusions:, These results ensure further data for beneficial effects of adjunctive SDD therapy in the management of severe chronic periodontitis. [source] The effect of topical doxycycline usage on gingival crevicular fluid MMP-8 levels of chronic and aggressive periodontitis patients: a pilot studyINTERNATIONAL JOURNAL OF DENTAL HYGIENE, Issue 3 2006Abstract:, The aim of this study was to evaluate the efficacy of topical subgingival application of doxycycline hyclate (DH) gel adjunctive to non-surgical periodontal therapy on gingival crevicular fluid (GCF) matrix metalloproteinase (MMP)-8 levels in chronic and aggressive periodontitis patients. Forty teeth of 10 chronic periodontitis patients and 32 teeth of eight aggressive periodontitis patients were screened for 6 months. Scaling and root planing (SRP) was applied to the control sites and DH gel adjunctive to SRP was applied to the test sites of each patient simultaneously. GCF MMP-8 levels were analysed at baseline, 7 days; and at 1, 3 and 6 months by Sandwich Elisa Method. At 1, 3 and 6 months, probing depth (P < 0.0051) and plaque scores and bleeding on probing values (P = 0.000) significantly decreased in each group when compared with the baseline, but there was no statistically significant difference between the test and control sites. GCF MMP-8 levels reduced presenting statistically significant differences on 7 days, 1, 3 and 6 months in four of the groups (P < 0.05); however, intergroup differences were not statistically significant. Developing functional and immunological-based chair-side MMP tests might serve as useful adjunctive diagnostic tools when monitoring the effects of DH gel application. [source] Regenerative treatment with platelet-rich plasma combined with a bovine-derived xenograft in smokers and non-smokers: 12-month clinical and radiographic resultsJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 1 2010Selcuk Yilmaz Abstract Aim: The purpose of this study was to assess the healing response of intrabony defects following regenerative treatment with platelet-rich plasma (PRP) combined with a bovine-derived xenograft (BDX) in smokers and non-smokers. Materials and Methods: A total of 24 advanced chronic periodontitis patients, 12 smokers and 12 non-smokers, with 113 intrabony defects with an intrabony component of 3 mm were included in this study. Defects were surgically treated with PRP/BDX. At baseline and 12 months after surgery, the following parameters were recorded: plaque and sulcus bleeding indices, probing depth (PD), relative attachment level, marginal recession, probing and radiographic bone levels. Results: Considering the soft tissue measurements, smokers and non-smokers presented a mean PD reduction of 3.97 ± 0.76 and 4.63 ± 0.52 mm, recession of 0.76 ± 0.44 and 0.50 ± 0.12 mm and attachment gain of 3.26 ± 0.42 and 4.06 ± 0.40 mm, respectively. Evaluation of the hard tissue findings revealed that the mean clinical and radiographic bone gains in smokers and non-smokers were 2.83 ± 0.47 and 3.63 ± 0.38 mm, 2.98 ± 0.38 and 3.67 ± 0.48 mm, respectively. Inter-group differences for PD reduction (p<0.05), attachment (p<0.001), clinical (p<0.001) and radiographic bone gains (p<0.001) were found to be significant between smokers and non-smokers. Conclusions: Within the limits of this study, the results indicate that treatment outcome following PRP/BDX application in intrabony defects is impaired with smoking. [source] Saliva concentrations of RANKL and osteoprotegerin in smoker versus non-smoker chronic periodontitis patientsJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 10 2008Nurcan Buduneli Abstract Objectives: To compare the salivary receptor activator of NF- ,B ligand (RANKL) and osteoprotegerin (OPG) concentrations in smokers versus non-smokers with chronic periodontitis. Material and Methods: Whole saliva samples were obtained from 67 untreated chronic periodontitis patients, of whom 34 were smokers, and from 44 maintenance patients, of whom 22 were smokers. Full-mouth clinical periodontal measurements were recorded. Saliva cotinine, sRANKL and OPG concentrations were determined by ELISA. Statistical analysis was performed using the Mann,Whitney U test, Bonferroni's correction for multiple comparisons and Spearman's correlations. Results: Untreated smokers exhibited significantly higher values of clinical periodontal recordings than untreated non-smokers (all p<0.05). Salivary cotinine level correlated with clinical attachment level (p=0.023). Smoker versus non-smoker maintenance groups showed no significant differences in clinical parameters. There were significant differences in sRANKL and OPG concentrations between untreated and maintenance groups (all p<0.01). Salivary OPG concentration was significantly lower (all p<0.01) and the sRANKL/OPG ratio was higher (all p<0.01) in smokers than in non-smokers. OPG concentration correlated positively with probing depth, clinical attachment level and bleeding on probing (all p<0.005) and negatively with pack-year, and cotinine level (p<0.05). Conclusion: Salivary RANKL and OPG concentrations are suggested to be affected by smoking as not only the untreated but also the treated smokers exhibited higher RANKL and lower OPG concentrations than non-smokers. [source] Formation of osteoclast-like cells from peripheral blood of periodontitis patients occurs without supplementation of macrophage colony-stimulating factorJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 7 2008Stanley T. S. Tjoa Abstract Aim: To determine whether peripheral blood mononuclear cells (PBMCs) from chronic periodontitis patients differ from PBMCs from matched control patients in their capacity to form osteoclast-like cells. Material and Methods: PBMCs from 10 subjects with severe chronic periodontitis and their matched controls were cultured on plastic or on bone slices without or with macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor- ,B ligand (RANKL). The number of tartrate-resistant acid phosphatase-positive (TRACP+) multinucleated cells (MNCs) and bone resorption were assessed. Results: TRACP+ MNCs were formed under all culture conditions, in patient and control cultures. In periodontitis patients, the formation of TRACP+ MNC was similar for all three culture conditions; thus supplementation of the cytokines was not needed to induce MNC formation. In control cultures, however, M-CSF or M-CSF/RANKL resulted in higher numbers compared with cultures without cytokines. Upregulations of osteoclast marker mRNA cathepsin K and carbonic anhydrase II confirmed the osteoclastic character. Bone resorption was only observed when PBMCs were cultured in the presence of M-CSF and RANKL. Conclusion: Our data indicate that PBMCs from periodontitis patients do not need priming by M-CSF to become osteoclast-like cells, suggesting that PBMCs from periodontitis patients are present in the circulation in a different state of activity. [source] Subgingival microbial profiles in chronic periodontitis patients from Chile, Colombia and SpainJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 2 2008David Herrera Abstract Aim: To investigate the subgingival microbiota of distinct periodontitis patient populations, in Chile, Colombia and Spain, using identical clinical and bacteriological methods. Material and Methods: In this multicentre study, 114 chronic periodontitis patients were selected. Patients were examined using an identical clinical protocol and pooled subgingival samples were obtained from each patient. Samples were processed in the three laboratories by means of culturing under identical clinical and microbiological protocols. Total anaerobic counts and frequency of detection and proportions of nine periodontal pathogens were calculated. Variables were analysed by means of anova, ,2, Kruskal,Wallis and Dunn's multiple comparison tests. Results: The Colombian population demonstrated greater severity of periodontitis, with significantly deeper mean probing pocket depth, and had a significantly lower percentage of current smokers. When comparing samples from the three patient populations, the total counts were significantly higher in the Colombian patients. The numbers of putative pathogens differed among groups. Tannerella forsythia was found less frequently in Chilean samples, while Parvimonas micra and enteric rods differed significantly among the three population groups. Conclusion: Significant differences among Chile, Colombia and Spain existed regarding the frequency and proportions of specific periodontal pathogens in the subgingival microbiota of periodontitis patients. [source] Comparison of gingival blood flow during healing of simplified papilla preservation and modified Widman flap surgery: a clinical trial using laser Doppler flowmetryJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 10 2007M. Retzepi Abstract Aim: This prospective randomized-controlled clinical trial compared the gingival blood flow responses following simplified papilla preservation (test) versus modified Widman flap (control). Materials and Methods: Twenty contra-lateral upper sites with pocket depth 5 mm after initial treatment in 10 chronic periodontitis patients were randomly assigned to either test or control treatment, using a split-mouth design. Laser Doppler flowmetry recordings were performed pre-operatively, following anaesthesia, immediately post-operatively and on days 1, 2, 3, 4, 7, 15, 30 and 60, at nine selected sites per flap. Results: Significant ischaemia was observed at all sites following anaesthesia and immediately post-operatively. At the mucosal flap basis, a peak hyperaemic response was observed on day 1, which tended to resolve by day 4 at the test sites, but persisted until day 7 at the control sites. The buccal and palatal papillae blood perfusion presented the maximum increase on day 7 in both groups and returned to baseline by day 15. Both surgical modalities yielded significant pocket depth reduction, recession increase and clinical attachment gain. Conclusions: Periodontal access flaps represent an ischaemia,reperfusion flap model. The simplified papilla preservation flap may be associated with faster recovery of the gingival blood flow post-operatively compared with the modified Widman flap. [source] Antibiotic resistance profile of the subgingival microbiota following systemic or local tetracycline therapyJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 6 2004Rosa Maria J. Rodrigues Abstract Background: Tetracyclines have been extensively used as adjunctives to conventional periodontal therapy. Emergence of resistant strains, however, has been reported. This study evaluated longitudinally the tetracycline resistance patterns of the subgingival microbiota of periodontitis subjects treated with systemic or local tetracycline therapy+scaling and root planing (SRP). Methods: Thirty chronic periodontitis patients were randomly assigned to three groups: SRP+500 mg of systemic tetracycline twice/day for 14 days; SRP alone and SRP+tetracycline fibers (Actsite®) at four selected sites for 10 days. Subgingival plaque samples were obtained from four sites with probing pocket depths (PPD)6 mm in each patient at baseline, 1 week, 3, 6 and 12 months post-therapy. Samples were dispersed and diluted in pre-reduced anaerobically sterilized Ringer's solution, plated on Trypticase Soy Agar (TSA)+5% blood with or without 4 ,g/ml of tetracycline and incubated anaerobically for 10 days. The percentage of resistant microorganisms were determined and the isolates identified by DNA probes and the checkerboard method. Significance of differences among and within groups over time was sought using the Kruskal,Wallis and Friedman tests, respectively. Results: The percentage of resistant microorganisms increased significantly at 1 week in the tetracycline groups, but dropped to baseline levels over time. The SRP+Actsite® group presented the lowest proportions of resistant species at 6 and 12 months. No significant changes were observed in the SRP group. The predominant tetracycline-resistant species included Streptococcus spp., Veillonela parvula, Peptostreptococcus micros, Prevotella intermedia, Gemella morbillorum and Actinobacillus actinomycetemcomitans (Aa). A high percentage of sites with resistant Aa, Porphyromonas gingivalis and Tanerella forsythensis was observed in all groups at baseline. However, T. forsythensis was not detected in any group and P. gingivalis was not present in the SRP+Actsite® group at 1 year post-therapy. Aa was still frequently detected in all groups after therapy. However, the greatest reduction was observed in the SRP+Actsite® group. Conclusion: Local or systemically administered tetracycline results in transitory selection of subgingival species intrinsically resistant to this drug. Although the percentage of sites harboring periodontal pathogens resistant to tetracycline were quite elevated in this population, both therapies were effective in reducing their prevalence over time. [source] Quadrant root planing versus same-day full-mouth root planingJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 2 2004II. Microbiological findings Abstract Objectives: The aim of this study was to test the hypothesis that over a period of 6 months, same-day full-mouth scaling and root planing (FM-SRP) resulted in greater reductions in the detection frequency of five putative periodontal pathogens compared with quadrant scaling and root planing (Q-SRP) in chronic periodontitis patients. Materials and Methods: Forty patients were recruited into this study. Subjects were randomised into two groups. The FM-SRP group received full-mouth scaling and root planing completed within the same day, while the Q-SRP group received quadrant root planing at 2-weekly intervals over four consecutive sessions. Selected-site analyses were performed on the deepest site in each quadrant before and after therapy, at approximately 3 and 6 months from baseline (R1 and R2) and clinical indices were recorded with an electronic pressure-sensitive probe. In addition, subgingival plaque samples were collected from these sites at baseline (BAS), at reassessment 1 (R1), approximately 6 weeks after the completion of therapy and at reassessment 2 (R2), 6 months from baseline. Polymerase chain reaction (PCR) was used to determine the presence of Porphyromonas gingivalis, Actinobacillus actinomycetemcomitans, Prevotella intermedia, Treponema denticola and Bacteroides forsythus in plaque. Results: Both therapies resulted in significant improvements in all clinical indices both at R1 and R2. A marked reduction in the presence of all candidate periodontal pathogens was noted after both treatment modalities, reaching statistical significance for the majority of the test organisms. These improvements were maintained over a period of 6 months. When the two treatment groups were compared, a significantly higher percentage of Q-SRP patients was positive for P. intermedia at R1 compared with FM-SRP patients (p<0.05). In addition, a greater reduction in the patient prevalence for T. denticola was found for the FM-SRP group than the Q-SRP group at R1 and R2 from baseline (p<0.005), but the significance of this is questionable given the skewed detection frequency of this organism at baseline between the two treatments (p<0.01). Conclusion: This study failed to confirm that same-day FM-SRP resulted in greater microbiological improvements compared with Q-SRP at 2-weekly intervals over a 6-month period, as determined by PCR. [source] Accumulation of methylglyoxal in the gingival crevicular fluid of chronic periodontitis patientsJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 4 2003S. Kashket Abstract Background, aims: Methylglyoxal (MG), a toxic product of cellular metabolism, is elevated in tissues and fluids in a number of human diseases. A cross-sectional study was undertaken to determine whether MG accumulates in the gingival crevicular fluid (GCF) of chronic periodontitis patients. Methods: GCF samples were collected for 30 s each from three teeth with pocket depths greater than 3 mm (DD sites), from 14 chronic periodontitis patients. Control samples were taken from three healthy sites (DH sites) in the same patients, as well as from seven subjects who were periodontally healthy (HH sites). Fluid volumes were determined and the strips were placed in 0.5 N perchloric acid. Subsequently, samples were derivatized with o -phenylenediamine and the resulting methylquinoxaline was assayed by high-performance liquid chromatography on Lichrospher® -100 RP-18, with UV detection. Results: Mean pocket depths were 5.7±0.7, 2.7±0.6 and 2.7±0.5 mm (mean±SD) for the DD, DH and HH sites, respectively. Mean MG levels were found to be 208.7±241.7 and 142.9±235.7 pmol/site in the GCF from DD and DH sites, respectively (p=0.0023), but only 11.5±4.4 pmol/site for the HH sites. Bacteroides forsythus has been found to accumulate high levels of MG in culture (unpublished data) and, consistent with this, the sampled diseased sites contained higher levels of B. forsythus than the corresponding healthy sites (2.7±4.2×105 versus 0.7±1.1×105, respectively; p=0.022). Total "red complex" microorganisms were significantly elevated in the DD sites. Conclusions: In view of the known protein- and DNA-modifying effects of MG, the finding of elevated levels of MG in the GCF from chronic periodontitis patients supports the hypothesis that MG may contribute to destructive tissue damage in this disease. Zusammenfassung Hintergrund: Methylglyoxal (MG), ein toxisches Produkt des Zellstoffwechsels, ist bei einer Reihe menschlicher Erkrankungen in Geweben und Körperflüssigkeiten erhöht. Zielsetzung: Querschnittsstudie zur Klärung der Frage, ob sich MG in der Sulkusflüssigkeit (SF) bei Patienten mit chronischer Parodontitis ansammelt. Methoden: Bei 14 Patienten mit chronischer Parodontitis wurde SF für 30 s an 3 Zähnen mit Sondierungstiefen >3 mm (DD-Stellen) gewonnen. Kontrollproben wurden von jeweils 3 gesunden Stellen (DH-Stellen) bei den gleichen Patienten und bei 7 parodontal gesunden Personen gewonnen (HH-Stellen). Die Flüssigkeitsvolumina wurden bestimmt und die Probenstreifen in 0,5 N Perchlorsäure gegeben. Anschließend wurden die Proben mit o-Phenyldiamin versetzt und das resultierende Methylquinoxalin wurde mittels High-Performance-Liquid-Chromatographie in einem Lichrospher®-100 RP-18 bei UV-Detektion nachgewiesen. Ergebnisse: Die mittleren Sondierungstiefen lagen bei 5,7±0,7, an den DD-Stellen, bei 2,7±0,6 (DH) und 2,7±0,5 mm (Mittelwert + Standardabweichung) (HH). Die mittleren MG-Spiegel lagen bei 208,7±241,7 an den DD-Stellen und bei 142,9±235,7 pmol/Stelle an den DH-Stellen (p=0,0023), aber nur bei 11,5±4,4 pmol/Stelle an den HH-Stellen. Es war gezeigt worden, dass Bacteroides forsythus in Kultur hohe Konzentrationen von MG ansammelt (unveröffentlichte Daten) und übereinstimmend damit wurden an den untersuchten DD-Stellen höhere Zahlen von B. forsythus gefunden als an den entsprechenden gesunden Stellen (2,7±4,2×105 versus 0,7±1,1×105; p=0,022). Die Zahl aller Keime des "Roten Komplexes" waren an DD-Stellen signifikant erhöht. Schlussfolgerungen: In Anbetracht der bekannten Proteine und DNS verändernden Effekte von MG unterstützt dieser Nachweis erhöhter MG-Spiegel in der SF bei Patienten mit chronischer Parodontitis die Hypothese, dass MG zur Gewebezerstörung bei Parodontitis beiträgt. Résumé Références et buts: Le méthylglyoxal (MG), un produit toxique du métabolisme cellulaire est retrouvé en quantitéélevée dans les tissus et les fluides lors de nombreuses maladies humaines. Une étude croisée fut réalisée pour déterminer si MG s'accumulait dans le fluide gingival (GCF) des patients atteints de parodontite chronique. Méthodes: Des échantillons de GCF furent prélevés pendant 30 secondes chacun de 3 dents avec des profondeurs de poches de plus de 3 mm (sites DD), chez 14 patients atteints de parodontites chroniques. Des échantillons contrôles furent prélevés sur des sites sains (sites DH) chez les mêmes patients, et aussi chez 7 sujets au parodonte sain (sites HH). Les volumes de fluide furent déterminés et les bandelettes ont été mises dans 0.5 N d'acide perchlorique. Puis, les échantillons furent transformés à l'aide de o-phenylenediamine et la méthylquinoxaline ainsi créée fut analysé par chromatographie liquide à haute performance sur une Lichrospher®-100 RP-18, avec détection aux UV. Résultats: Les profondeurs de poche moyenne étaient de 5.7 ± 0.7, 2.7 ± 0.6 et 2.7±0.5 mm (moyenne ± SD) pour les sites DD, DH et HH, respectivement. Les niveaux moyen de MG étaient de 208.7±241.7 et 142.9±235.7 pmol/site dans le fluide des sites in DD et DH, respectivement (p=0.0023), mais seulement de 11.5±4.4 pmol/site pour les sites HH. On a trouvé que Bacteroides forsythus accumulait de hauts niveaux de MG en culture (données non publiées) et les sites malades échantillonnés contenait effectivement de plus hauts niveaux de B. forsythus que les sites sains correspondants (2.7±4.2×105 contre 0.7±1.1×105, respectivement; p=0.022). Les microorganismes du complexe rouge étaient significativement en nombre élevé dans les sites DD. Conclusions: Au vu des effets connus de MG pour modifier les protéines et l'AND, la découverte de niveaux élevés de MG dans le fluide gingival de patients atteints de maladie parodontale chronique supporte l'hypothèse selon laquelle MG pourrait contribuer aux dommages tissulaires destructifs rencontrés au cours de cette maladie. [source] Real-time polymerase chain reaction quantification of Epstein,Barr virus in chronic periodontitis patientsJOURNAL OF PERIODONTAL RESEARCH, Issue 4 2005Antonis Konstantinidis Background:, Although herpes viruses have been implicated in the pathogenesis of chronic and aggressive periodontitis, few data in the literature refer to quantification of these viruses in periodontal sites, especially in relation to serological findings. Objective:, The aim of the present study was to compare Epstein,Barr virus (EBV) DNA load in subgingival specimens from chronic periodontitis patients and in periodontally healthy subjects, in relation to serologic testing of IgM and IgG antibodies to EBV. Methods:, A total of 22 chronic periodontitis patients and 13 controls participated in the present study. Seventy-nine subgingival specimens (one pooled, one from a deep and one from a shallow site), sampled with paper points, were analysed with real-time polymerase chain reaction for EBV. Subjects were also examined for anti-EBV IgG and IgM levels in serum, using an enzyme-linked immunosorbent assay. Results:, One subject was seronegative for EBV. Three subjects (one patient and two controls) displayed anti-EBV IgM. Their data were excluded from further analysis. All three displayed EBV in their subgingival samples. Nine out of the remaining 20 chronic periodontitis patients and 10 out of 11 controls did not display EBV subgingivally. A statistically significant difference in viral load was observed between pooled and shallow-pocket samples from periodontitis patients but not between samples from deep and shallow pockets (Kruskall,Wallis anova, Dunn's multiple comparisons test). Conclusions:, Data from the present study do not strongly support the pathogenetic significance of EBV in chronic periodontitis lesions. The data do, however, suggest that parallel serological assessments provide a useful insight into the association of viruses with periodontal disease. [source] Characterization and expression of a novel Porphyromonas gingivalis outer membrane protein, Omp28MOLECULAR ORAL MICROBIOLOGY, Issue 3 2002N. Slakeski We report the characterization of a Porphyromonas gingivalis gene, designated omp28, encoding a protein that we have previously purified and characterized as a 28-kDa outer membrane protein. The deduced amino acid sequence of the omp28 open reading frame displayed an outer membrane leader sequence and lipoprotein attachment site but did not exhibit any significant overall sequence identity with protein sequences in the databases. A small stretch of amino acids (19 residues) exhibits 50% sequence identity with a segment of a fimbrial protein from Dichelobacter nodosus involved in adhesion, suggesting that Omp28 may be a surface adhesin/receptor of P. gingivalis. Using the pET-24 vector we expressed recombinant Omp28 (rOmp28) in Escherichia coli. Western blot analyses of purified rOmp28 with rabbit antisera to a P. gingivalis outer membrane preparation, protective rat anti-whole P. gingivalis antisera and pooled human sera from chronic periodontitis patients showed that the recombinant was recognized by all antisera. Further, anti-rOmp28 antisera exhibited strong reactivity with a panel of four laboratory strains and 10 clinical isolates of P. gingivalis from the United States, Sudan, Romania and Norway. These results suggest that Omp28 is expressed by a wide distribution of P. gingivalis strains. [source] Lipid peroxidation levels, total oxidant status and superoxide dismutase in serum, saliva and gingival crevicular fluid in chronic periodontitis patients before and after periodontal therapyAUSTRALIAN DENTAL JOURNAL, Issue 1 2010D Wei Abstract Background:, Recent data have demonstrated increased lipid peroxidation (LPO) levels and oxidative stress in periodontitis. Malondialdehyde (MDA) and superoxide dismutase (SOD) are both increased during oxidative stress. Furthermore, this study examined SOD concentration, total oxidative status (TOS) and MDA levels in periodontal patients and investigated the longitudinal effect of periodontal therapy on the index levels of chronic periodontitis (CP) patients. Methods:, Serum, saliva and gingival crevicular fluid (GCF) samples were obtained from 48 CP patients and 35 healthy control subjects prior to, as well as after 16 weeks following non-surgical post-periodontal therapy. MDA, TOS and SOD and clinical parameters were determined pre- and post-therapy. Results:, The levels of TOS and SOD values were significantly higher in the CP group than in the control group (p < 0.05), but only MDA in GCF. Post-periodontal therapy, serum, saliva and GCF TOS and SOD levels significantly decreased compared to basal levels (p < 0.05), but only MDA in GCF. Conclusions:, LPO was higher in the periodontal region, with TOS and SOD increasing both locally and peripherally. Non-surgical therapy can restore and control the subject antioxidant capacity by locally and systemically modifying the levels of MDA, TOS and SOD. [source] | ||||||||||