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Bidirectional relationship between chronic kidney and periodontal disease: a study using structural equation modeling. Kidney Int 2010; 79:347-55. [PMID: 20927035 DOI: 10.1038/ki.2010.384] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Periodontal disease is associated with diabetes, heart disease, and chronic kidney disease (CKD), relationships postulated to be due in part to vascular inflammation. A bidirectional relationship between CKD and periodontal disease is plausible, though this relationship has not been previously reported. In this study, we assessed the potential for connections between CKD and periodontal disease, and mediators of these relationships using structural equation models of data from 11,211 adults ≥ 18 years of age who participated in the Third National Health and Nutrition Examination Survey. Multivariable logistic regression models were used to test the hypothesis that periodontal disease was independently associated with CKD. Given the potential that the periodontal disease and CKD relationship may be bidirectional, a two-step analytic approach was used that involved tests for mediation and structural equation models to examine more complex direct and indirect effects of periodontal disease on CKD, and vice versa. In two separate models, periodontal disease (adjusted odds ratio of 1.62), edentulism (adjusted odds ratio of 1.83), and the periodontal disease score were associated with CKD when simultaneously adjusting for 14 other factors. Altogether, three of four structural equation models support the hypothesized relationship. Thus, our analyses support a bidirectional relationship between CKD and periodontal disease, mediated by hypertension and the duration of diabetes.
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Joseph R, Nath SG, Joseraj MG. Elevated plasma homocysteine levels in chronic periodontitis: a hospital-based case-control study. J Periodontol 2010; 82:439-44. [PMID: 20831374 DOI: 10.1902/jop.2010.100271] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
BACKGROUND Plasma homocysteine (Hcy), a novel risk factor for cardiovascular disease, has been found to be increased in inflammatory diseases, such as rheumatoid arthritis. Our study investigates the association between chronic periodontitis and plasma Hcy. METHODS This case-control study involves 85 age- and sex-matched subjects with chronic periodontitis and 91 healthy controls. Patients were grouped into moderate and severe periodontitis. Plaque index, calculus component of simplified oral hygiene index, and modified gingival index were recorded. Body mass index, fasting blood sugar, total cholesterol, triglycerides, high-density lipoprotein, low-density lipoprotein, very-low-density lipoprotein, and plasma Hcy were also assessed. RESULTS Case and control groups had similar levels of fasting blood sugar, lipid profile, and body mass index. The mean plasma Hcy was found to be 19.22 ± 8.27 and 10.27 ± 2.50 μmol/L for cases and controls, respectively. A significant elevation in plasma Hcy levels was observed in cases (P <0.05). No significant differences were observed in plasma Hcy levels between moderate and severe chronic periodontitis (P = 0.722). CONCLUSIONS Elevated levels of plasma Hcy were observed in patients with chronic periodontitis. Future research should be directed on the effect of periodontal therapy on plasma Hcy levels.
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Affiliation(s)
- Rosamma Joseph
- Department of Periodontics, Government Dental College, Medical College Post Office, Calicut, Kerala, India.
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Polybacterial challenge effects on cytokine/chemokine production by macrophages and dendritic cells. Inflamm Res 2010; 60:119-25. [PMID: 20798974 DOI: 10.1007/s00011-010-0242-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Accepted: 08/02/2010] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVE To investigate the polymicrobial infection of periodontal disease, which elicits inflammatory mediators/cytokines/chemokines in the local gingival tissues, and a polybacterial challenge of antigen-presenting cells, e.g. macrophages and dendritic cells (DCs), at the mucosal surface. MATERIALS AND METHODS The cytokine/chemokine profiles of human macrophages and DCs in response to polybacterial challenges were investigated. RESULTS Oral Gram-negative bacteria elicited significantly greater IL-8 levels from macrophages, compared to Gram-positive bacteria. Gram-positive bacteria did not show synergism in inducing this chemokine from macrophages. In contrast, pairs of oral Gram-negative bacteria elicited synergistic production of IL-8 by macrophages. Similar results were not observed with TNFα, which only appeared additive with the polybacterial challenge. Selected Gram-negative bacterial pairs synergized in IL-6 production by immature DCs. In mature DCs (mDCs), a Porphyromonas gingivalis/Fusobacterium nucleatum and Porphyromonas intermedia/F. nucleatum polybacterial challenge resulted in significant synergism for IL-6 and TNFα levels. However, only the Pi/Fn combination synergized for IL-12 production and there appeared to be no polybacterial effect on IL-10 production by the mDCs. CONCLUSIONS These results indicate that a polybacterial challenge of cells linking innate and adaptive immune responses results in varied response profiles that are dependent upon the characteristics of the microorganisms that are components of the polybacterial complex.
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Ramirez JH, Arce R, Contreras A. Why must physicians know about oral diseases? TEACHING AND LEARNING IN MEDICINE 2010; 22:148-155. [PMID: 20614382 DOI: 10.1080/10401331003656744] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
BACKGROUND Poor oral health reflects social inequalities, hence the prevention of oral diseases should be a priority in developed and underdeveloped countries around the world. Medical practitioners must play an active role in oral health promotion. SUMMARY Proper knowledge of oral diseases is crucial in medical practice due to the following reasons: (a) Periodontal disease is associated with multiple systemic conditions of medical interest, (b) a large number of systemic diseases have oral manifestations, (c) many drugs are associated with oral adverse drug reactions, (d) physicians are generally not sufficiently trained to detect oral cancer manifestations, (e) physicians could play a pivotal role in oral public health, and (f) early detection of oral diseases by physicians could improve the oral health status of the population. CONCLUSIONS Physicians need to get more involved in oral health promotion. Moreover, oral health education should be included in the curriculum of future medical students.
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Affiliation(s)
- Jorge Hernán Ramirez
- Peridontal Medicine Group, School of Dentistry, Universidad del Valle, Cali, Colombia.
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Oral health and risk for head and neck squamous cell carcinoma: the Carolina Head and Neck Cancer Study. Cancer Causes Control 2010; 21:567-75. [PMID: 20049634 DOI: 10.1007/s10552-009-9486-9] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2009] [Accepted: 12/04/2009] [Indexed: 01/21/2023]
Abstract
OBJECTIVE Recent reports have linked oral health and periodontal disease indicators with increased risk of squamous cell carcinoma of head and neck (SCCHN). Thus far, evidence has been inconclusive; our objective was to study the association between oral health and SCCHN risk in the context of a large population-based study. METHODS A population-based case-control study of incident SCCHN, the Carolina Head and Neck Cancer Study was carried out in 2002-2006 in 46 counties in North Carolina. Controls (n = 1,361) were frequency matched with cases (n = 1,289) on age, race, and gender. Oral health was assessed using interview data on tooth loss and mobility, mouthwash use, and frequency of dental visits. RESULTS Subjects were 26-80 years old (median age = 61). The distribution of tooth loss among controls was 0-5 teeth = 60%; 5-14 = 15%; and 16-28 = 25%. After controlling for covariates, tooth loss did not yield any notable association with SCCHN (16-28 vs. 0-5 lost teeth: OR: 1.21, 95% CI: 0.94, 1.56). Self-reported history of tooth mobility was moderately associated with increased SCCHN risk (OR: 1.33, 95% CI: 1.07, 1.65); however, the association did not persist among never smokers. Routine dental visits were associated with 30% risk reduction (OR: 0.68, 95% CI: 0.53, 0.87). CONCLUSIONS These data provide support for a possible modest association of periodontal disease, as measured by self-reported tooth loss indicators, but not tooth loss per se, with SCCHN risk.
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Franca M, Moura-Costa L, Meyer RJ, Trindade SC, Tunes UDR, Freire SM. Humoral immune response to antigens of Porphyromonas gingivalis ATCC 33277 in chronic periodontitis. J Appl Oral Sci 2009; 15:213-9. [PMID: 19089132 PMCID: PMC4327469 DOI: 10.1590/s1678-77572007000300011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2006] [Accepted: 05/07/2007] [Indexed: 12/03/2022] Open
Abstract
Introduction: Periodontitis is a chronic disease that results from an interaction of a mixed bacterial challenge and the host response. Objective: The purposes of this study were to evaluate the IgG serum levels to Porphyromonas gingivalis antigens by ELISA in individuals with different periodontal conditions correlated with clinical parameters, and to analyze the immunoreactivity profiles by Western blotting. Methods: Serum IgG levels against the cell sonicate antigen from P. gingivalis ATCC 33277 of 28 patients with chronic periodontitis (CP), 10 patients with gingivitis (G) and 21 periodontally healthy individuals (H) were measured by ELISA and Western immunoblotting. Results: In the CP group, sera reactivity by ELISA was significantly higher than in the G and H groups (Kruskal-Wallis p<0.001; Dunnet t3 p= 0.001 and Dunnet t3 p= 0.0001). There was no statistically significant difference between G and HP reactivity (Dunnett t3 p=0.617). Among individuals with chronic periodontitis, the IgG-anti-P. gingivalis serum levels were positively correlated with percentage of clinical attachment level =5mm (rs = + 0.375, p<0.05) and a negative correlation was found between IgG-anti-P. gingivalis levels and percentage of probing pocket depth 0-3mm (rs = - 0. 411, p< 0.05). The analysis of sera immunoreactivity profiles to sonicate antigen by Western blotting showed differences between the sera of CP, G and H group individuals. The serum from CP frequently reacted with high molecular weight (103 kDa, 86 kDa, 72 kDa, 60 kDa, 58 kDa, 52 kDa) protein fractions. Conclusions: Serum levels of IgG anti-P. gingivalis distinguished individuals with chronic periodontitis, gingivitis and healthy periodontium. There was a correlation between clinical parameters and serum IgG levels against P. gingivalis. There was a difference in the recognition profile of protein fractions among the studied groups and some bands were more specific
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Affiliation(s)
- Mônica Franca
- Bahia State Foundation for the Development of Sciences, Salvador, BA, Brazil.
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Noble JM, Borrell LN, Papapanou PN, Elkind MSV, Scarmeas N, Wright CB. Periodontitis is associated with cognitive impairment among older adults: analysis of NHANES-III. J Neurol Neurosurg Psychiatry 2009; 80:1206-11. [PMID: 19419981 PMCID: PMC3073380 DOI: 10.1136/jnnp.2009.174029] [Citation(s) in RCA: 209] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Periodontitis is ubiquitous and associated with serological evidence of exposure to periodontal organisms, systemic inflammation and vascular disease. Dementia is a major public health problem likely related to a complex interaction between genetics and diseases associated with systemic inflammation, including diabetes, smoking and stroke. METHODS To assess relationships between systemic exposure to periodontal pathogens and cognitive test outcomes, data were analysed from the Third National Health and Nutrition Examination Survey (NHANES-III), a nationally representative cross sectional observational study among older adults. We included 2355 participants >or=60 years who completed measures of cognition and Poryphyromonas gingivalis IgG. Using SUDAAN, logistic regression models examined the association of P gingivalis IgG with cognitive test performance. RESULTS Poor immediate verbal memory (<5/9 points) was prevalent in 5.7% of patients, and 6.5% overall had impaired delayed recall (<4/9); 22.1% had difficulty with serial subtractions (<5/5 trials correct). Individuals with the highest P gingivalis IgG (>119 ELISA Units (EU)) were more likely to have poor delayed verbal recall (OR 2.89, 95% CI 1.14 to 7.29) and impaired subtraction (OR 1.95, 95% CI 1.22 to 3.11) than those with the lowest ( CONCLUSION A serological marker of periodontitis is associated with impaired delayed memory and calculation. Further exploration of relationships between oral health and cognition is warranted.
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Affiliation(s)
- J M Noble
- Gertrude H Sergievsky Center, Columbia University Medical Center, New York, NY, USA.
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Ebersole JL, Novak MJ, Michalowicz BS, Hodges JS, Steffen MJ, Ferguson JE, Diangelis A, Buchanan W, Mitchell DA, Papapanou PN. Systemic immune responses in pregnancy and periodontitis: relationship to pregnancy outcomes in the Obstetrics and Periodontal Therapy (OPT) study. J Periodontol 2009; 80:953-60. [PMID: 19485826 DOI: 10.1902/jop.2009.080464] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Our previous studies reported on the obstetric, periodontal, and microbiologic outcomes of women participating in the Obstetrics and Periodontal Therapy (OPT) Study. This article describes the systemic antibody responses to selected periodontal bacteria in the same patients. METHODS Serum samples, obtained from pregnant women at baseline (13 to 16 weeks; 6 days of gestation) and 29 to 32 weeks, were analyzed by enzyme-linked immunosorbent assay for serum immunoglobulin G (IgG) antibody to Aggregatibacter actinomycetemcomitans (previously Actinobacillus actinomycetemcomitans), Campylobacter rectus, Fusobacterium nucleatum, Porphyromonas gingivalis, Prevotella intermedia, Tannerella forsythia (previously T. forsythensis), and Treponema denticola. RESULTS At baseline, women who delivered live preterm infants had significantly lower total serum levels of IgG antibody to the panel of periodontal pathogens (P = 0.0018), to P. gingivalis (P = 0.0013), and to F. nucleatum (P = 0.0200) than women who delivered at term. These differences were not significant at 29 to 32 weeks. Changes in IgG levels between baseline and 29 to 32 weeks were not associated with preterm birth when adjusted for treatment group, clinical center, race, or age. In addition, delivery of low birth weight infants was not associated with levels of antibody at baseline or with antibody changes during pregnancy. CONCLUSIONS Live preterm birth is associated with decreased levels of IgG antibody to periodontal pathogens in women with periodontitis when assessed during the second trimester. Changes in IgG antibody during pregnancy are not associated with birth outcomes.
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Affiliation(s)
- Jeffrey L Ebersole
- Center for Oral Health Research and Department of Obstetrics and Gynecology, University of Kentucky, Lexington, KY, USA.
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Dye BA, Herrera-Abreu M, Lerche-Sehm J, Vlachojannis C, Pikdoken L, Pretzl B, Schwartz A, Papapanou PN. Serum antibodies to periodontal bacteria as diagnostic markers of periodontitis. J Periodontol 2009; 80:634-47. [PMID: 19335084 DOI: 10.1902/jop.2009.080474] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Assessment of periodontal conditions in epidemiologic studies usually requires a clinical examination, which is resource-intensive. We investigated the ability of serum immunoglobulin G (IgG) antibodies to periodontal bacteria to reflect clinical periodontal status. METHODS We used checkerboard immunoblotting to assess serum IgG levels to 19 species, including established/putative periodontal pathogens and non-pathogenic bacteria, in 5,747 dentate adults aged > or = 40 years who participated in the third National Health and Nutrition Examination Survey between 1988 and 1994. Three earlier described alternative definitions of periodontitis were used, based on specific combinations of probing depth and attachment level values. Optimized elevated titer thresholds and corresponding sensitivities and specificities were calculated for each definition. Titers significantly associated with periodontitis were identified in univariable and multivariable logistic regression models. Parsimonious models were subsequently developed using age, gender, race/ethnicity, education, smoking, and diagnosed diabetes. RESULTS In unadjusted models, high titers to Porphyromonas gingivalis were most strongly associated with periodontitis across all definitions (odds ratio, 2.07 to 2.74; P <0.05). In parsimonious models including demographic data, smoking, and diagnosed diabetes, high P. gingivalis titers were consistently associated with periodontitis, whereas high Eubacterium nodatum titers were associated with periodontal health in two of three definitions. Receiver operating characteristic curves for the parsimonious multivariable models showed that the area under the curve ranged between 0.72 and 0.78. CONCLUSIONS Serum IgG titers to selected periodontal species, combined with demographic and behavioral characteristics, resulted in a moderately accurate classification of periodontal status in epidemiologic studies. The external validity of these findings must be examined further.
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Affiliation(s)
- Bruce A Dye
- Centers for Disease Control and Prevention, National Center for Health Statistics, Hyattsville, MD, USA
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Bagaitkar J, Williams LR, Renaud DE, Bemakanakere MR, Martin M, Scott DA, Demuth DR. Tobacco-induced alterations to Porphyromonas gingivalis-host interactions. Environ Microbiol 2009; 11:1242-53. [PMID: 19175666 DOI: 10.1111/j.1462-2920.2008.01852.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Smokers are more susceptible than non-smokers to persistent infection by Porphyromonas gingivalis, a causative agent of periodontitis. Patients who smoke exhibit increased susceptibility to periodontitis and are more likely to display severe disease and be refractory to treatment. Paradoxically, smokers demonstrate reduced clinical inflammation. We show that P. gingivalis cells exposed to cigarette smoke extract (CSE) induce a lower proinflammatory response (tumour necrosis factor-alpha, interleukin-6, interleukin-12 p40) from monocytes and peripheral blood mononuclear cells than do unexposed bacteria. This effect is reversed when CSE-exposed bacteria are subcultured in fresh medium without CSE. Using microarrays representative of the P. gingivalis genome, CSE-exposure resulted in differential regulation of 6.8% of P. gingivalis genes, including detoxification and oxidative stress-related genes; DNA repair genes; and multiple genes related to P. gingivalis virulence, including genes in the major fimbrial and capsular operons. Exposure to CSE also altered the expression of outer membrane proteins, most notably by inducing the virulence factors RagA and RagB, and a putative lipoprotein cotranscribed with the minor fimbrial antigen. Therefore, CSE represents an environmental stress to which P. gingivalis adapts by altering gene expression and outer membrane proteins. These changes may explain, in part, the altered virulence and host-pathogen interactions that have been documented in vivo in smokers with periodontal disease.
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Affiliation(s)
- Juhi Bagaitkar
- Microbiology and Immunology, University of Louisville, Louisville, KY 40292, USA
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Fisher MA, Taylor GW, Papapanou PN, Rahman M, Debanne SM. Clinical and serologic markers of periodontal infection and chronic kidney disease. J Periodontol 2008; 79:1670-8. [PMID: 18771368 DOI: 10.1902/jop.2008.070569] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND Chronic kidney disease and its concomitant sequelae represent a major public health problem. Recent data suggest periodontal infection contributes to chronic kidney disease. METHODS This United States population-based study of 4,053 adults > or =40 years of age investigated the association between chronic kidney disease and clinical measures and serologic markers of periodontal infection. Chronic kidney disease was defined as moderate-to-severe reduction of kidney function with glomerular filtration rate of 15 to 59 ml/minute/1.73 m(2) based on stages 3 and 4 of the Kidney Disease Outcome Quality Initiative. Chronic oral inflammatory burden was measured as 1) clinical periodontal infection categorized as no periodontal disease, periodontal disease (at least one tooth with > or =4 mm loss of attachment and bleeding on probing as an indicator of inflammation), or edentulism and 2) serum immunoglobulin G antibody response to Aggregatibacter actinomycetemcomitans (previously Actinobacillus actinomycetemcomitans) and Porphyromonas gingivalis. Multiple logistic regression modeling quantified the association between chronic kidney disease and chronic inflammatory burden and other risk factors. RESULTS Nine percent of the study population had chronic kidney disease, 22% had high A. actinomycetemcomitans antibody titer, 24% had high P. gingivalis antibody titer, 9% had periodontal disease, and 17% were edentulous. After simultaneously adjusting for recognized risk factors, adults with a high A. actinomycetemcomitans titer were less likely to have chronic kidney disease (adjusted odds ratio [OR(Adj)] = 0.67; 95% confidence interval [CI]: 0.46 to 0.98), and adults with edentulism were more likely to have chronic kidney disease (OR(Adj) = 1.64; 95% CI: 1.11 to 2.44). CONCLUSION These results support considering edentulism and low serum titer to A. actinomycetemcomitans as risk indicators for chronic kidney disease.
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Affiliation(s)
- Monica A Fisher
- Department of Orthodontics, School of Dental Medicine, Case Western Reserve University, Cleveland, OH, USA
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Champagne C, Yoshinari N, Oetjen JA, Riché EL, Beck JD, Offenbacher S. Gender differences in systemic inflammation and atheroma formation following Porphyromonas gingivalis infection in heterozygous apolipoprotein E-deficient mice. J Periodontal Res 2008; 44:569-77. [PMID: 18973527 DOI: 10.1111/j.1600-0765.2008.01156.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND OBJECTIVE Men are at higher risk for periodontal and cardiovascular diseases compared with women, although they have lower serum levels of risk markers, including lipids and acute phase proteins. In this study, we investigated whether infection with a major periodontal pathogen, Porphyromonas gingivalis, affected the inflammatory and atherosclerotic response of male and female mice differently. MATERIAL AND METHODS Forty-eight heterozygous apolipoprotein E-deficient mice (24 males and 24 females), maintained on normal diet, were infected twice by intrasubcutaneous chamber injections of P. gingivalis or vehicle at weeks 11 and 14 of age. Serum samples were collected before the first infection and bi-weekly thereafter, to quantify levels of high-density lipoprotein (HDL) cholesterol and the murine acute phase protein, serum amyloid A (SAA). Mice were killed at week 17 to evaluate aortic atheroma lesion score. RESULTS Males had significantly higher baseline HDL cholesterol levels (p < 0.01, factorial ANOVA). Following P. gingivalis infection, HDL cholesterol levels decreased over time in infected males only [p < 0.05, generalized estimating equation (GEE)], whereas SAA levels increased and remained elevated over time in both male and female infected mice (p < 0.01, GEE). Lesion scores were significantly higher in infected mice (3-fold, p < 0.01, factorial ANOVA), and lesion scores of all mice were positively correlated with SAA levels at the time of killing (Spearman correlation coefficient = 0.40, p < 0.01). CONCLUSION In these young mice, P. gingivalis infection induced sex-specific changes in serum lipids but no gender differences in acute phase proteins and atheroma lesion score.
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Affiliation(s)
- C Champagne
- Center for Oral and Systemic Diseases, School of Dentistry, University of North Carolina Chapel Hill, Chapel Hill, NC 27599-7450, USA.
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Dye BA, Nowjack-Raymer R, Barker LK, Nunn JH, Steele JG, Tan S, Lewis BG, Beltran-Aguilar ED. Overview and Quality Assurance for the Oral Health Component of the National Health and Nutrition Examination Survey (NHANES), 2003-04. J Public Health Dent 2008; 68:218-26. [DOI: 10.1111/j.1752-7325.2007.00076.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Demmer RT, Kocher T, Schwahn C, Völzke H, Jacobs DR, Desvarieux M. Refining exposure definitions for studies of periodontal disease and systemic disease associations. Community Dent Oral Epidemiol 2008; 36:493-502. [PMID: 18422705 DOI: 10.1111/j.1600-0528.2008.00435.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Substantial variation exists in reported associations between periodontal infections and cardiovascular disease. Imprecise periodontal exposure definitions are possible contributors to this variability. We studied appropriate exposure definitions for studying associations between clinical periodontal disease (PD) and systemic disease. METHODS Data originate from men and women aged 20-79 enrolled in the Study of Health in Pomerania (SHIP) from 1997-2001. Age and sex-adjusted correlation analysis identified PD definitions with the highest cross-sectional associations with three subclinical markers of systemic disease: plasma fibrinogen (n = 3481), serum hemoglobin A1c (HbA1c) (n = 3480), and common carotid artery intima-media thickness (c-IMT) (n = 1745, age > or = 45). RESULTS In men and women, percent of sites with attachment loss (AL) > or =6 mm and tooth loss both revealed the highest correlation with HbA1c (rho = 0.11; several other definitions related similarly), while the strongest fibrinogen correlation was observed with percent of sites with pocket depth > or =3 mm (rho = 0.19). Findings for c-IMT among men were strongest for percent of sites with AL > or =6 mm (rho = 0.14; several other definitions related similarly) while among women, percent of sites with pocket depth > or =5 or 6 mm had the highest observed correlation (rho = 0.13). CONCLUSIONS A range of near optimal definitions varied according to gender and whether the systemic disease marker reflected an acute or chronic situation. Pocket depth was more strongly correlated with the acute marker fibrinogen while attachment and tooth loss tended to be more strongly correlated with the chronic markers, HbA1c, and c-IMT. These findings can be useful in designing future studies investigating the association between PD and systemic disease.
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Affiliation(s)
- Ryan T Demmer
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY 10032, USA.
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Paraskevas S, Huizinga JD, Loos BG. A systematic review and meta-analyses on C-reactive protein in relation to periodontitis. J Clin Periodontol 2008; 35:277-90. [PMID: 18294231 DOI: 10.1111/j.1600-051x.2007.01173.x] [Citation(s) in RCA: 482] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
AIM Elevated plasma C-reactive protein (CRP) is regarded as a risk predictor for cardiovascular diseases. This systematic review explored the robustness of observations that CRP is elevated in periodontitis. Similarly, the effect of periodontal therapy on CRP levels was investigated. MATERIAL AND METHODS Selection of publications was based on: (1) cross-sectional (case-control) studies; (2) longitudinal (treatment) studies; (3) high-sensitivity CRP measurement; (4) median and/or mean (+/-SD) values presented; and (5) subjects with no systemic disorders. RESULTS Screening of the initially 448 identified studies and reference checking resulted in 18 suitable papers. The majority of the studies showed that CRP levels are higher in patients than in controls. Often, studies showed that patients had CRP levels >2.1 mg/l. A meta-analysis of 10 cross-sectional studies showed that the weighted mean difference (WMD) of CRP between patients and controls was 1.56 mg/l (p<0.00001). Evidence from available treatment studies (n=6) showed lower levels of CRP after periodontal therapy. Eligible treatment studies in a meta-analysis demonstrated a WMD of reductions of CRP after therapy of 0.50 mg/L (95% CI 0.08-0.93) (p=0.02). CONCLUSIONS There is strong evidence from cross-sectional studies that plasma CRP in periodontitis is elevated compared with controls. There is modest evidence on the effect of periodontal therapy in lowering the levels of CRP.
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Affiliation(s)
- Spiros Paraskevas
- Department of Periodontology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University, Amsterdam, The Netherlands.
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Maternal periodontal disease, systemic inflammation, and risk for preeclampsia. Am J Obstet Gynecol 2008; 198:389.e1-5. [PMID: 18295179 DOI: 10.1016/j.ajog.2007.12.002] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2007] [Revised: 12/03/2007] [Accepted: 12/06/2007] [Indexed: 11/20/2022]
Abstract
OBJECTIVE Maternal periodontal disease, a chronic oral infectious and inflammatory disorder, is associated with an increased risk for preeclampsia. Our objective was to determine the relationship between maternal periodontal disease, maternal systemic inflammation, and the development of preeclampsia. STUDY DESIGN A secondary analysis of data from the Oral Conditions and Pregnancy Study was performed. A cohort of healthy pregnant women enrolled at less than 26 weeks underwent an oral health examination, serum sampling, and delivery follow-up. Periodontal disease was categorized clinically as present or absent. Maternal serum was assayed for C-reactive protein by high-sensitivity enzyme-linked immunosorbent assay and stratified as elevated (> or = 75th percentile) or not elevated (< 75th percentile). Preeclampsia was defined as blood pressure > 140/90 mmHg and at least 1+ proteinuria on a catheterized urine specimen. Risk ratios (RR) for preeclampsia were calculated, stratified by periodontal disease and C-reactive protein level. RESULTS Thirty-one (4%) of 775 women with complete data developed preeclampsia. Women with CRP > or = 75th percentile were more likely than those with CRP < 75th percentile to develop preeclampsia (7% vs 3%, P < .03; RR, 95% CI 2.2, 1.1-4.4). Women with periodontal disease and CRP > or = 75th percentile were at increased risk for preeclampsia (adjusted RR 5.8, 1.2-26.9), compared to women without periodontal disease and either CRP < 75th or > or = 75th percentile. CONCLUSION Maternal periodontal disease with systemic inflammation as measured by C-reactive protein is associated with an increased risk for preeclampsia.
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67
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Pitiphat W, Savetsilp W, Wara-Aswapati N. C-reactive protein associated with periodontitis in a Thai population. J Clin Periodontol 2007; 35:120-5. [PMID: 18081858 DOI: 10.1111/j.1600-051x.2007.01179.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
AIM C-reactive protein (CRP) has been implicated as a possible mediator of the association between periodontitis and several systemic diseases. Previous studies suggest an association between increased CRP levels and periodontitis predominantly in Caucasians. This study evaluated the associations of chronic periodontitis and Porphyromonas gingivalis with CRP in systemically healthy Thai adults. MATERIAL AND METHODS Serum high-sensitivity CRP was measured in 21 generalized periodontitis, 62 localized periodontitis, and 38 periodontally healthy control subjects. P. gingivalis in subgingival plaque samples was analyzed by polymerase chain reaction. RESULTS Overall, these subjects had a median CRP level lower than that reported in the western populations. Subjects with generalized periodontitis and localized periodontitis had higher median CRP levels than controls (1.78 and 0.65 mg/l versus 0.25 mg/l, p<0.001). Multivariate linear regression showed that log CRP levels were increased in subjects with generalized periodontitis (p<0.01) and localized periodontitis (p=0.03) compared with the controls, adjusted for age, body mass index and smoking. Presence of P. gingivalis was also independently associated with elevated log CRP levels (p<0.001). CONCLUSION Periodontitis and subgingival P. gingivalis are associated with increased CRP levels. These findings suggest that periodontal infection may contribute to systemic inflammatory burden in otherwise healthy individuals.
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Affiliation(s)
- Waranuch Pitiphat
- Department of Community Dentistry, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
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Chen YW, Umeda M, Nagasawa T, Takeuchi Y, Huang Y, Inoue Y, Iwai T, Izumi Y, Ishikawa I. Periodontitis may increase the risk of peripheral arterial disease. Eur J Vasc Endovasc Surg 2007; 35:153-8. [PMID: 17964192 DOI: 10.1016/j.ejvs.2007.08.016] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2007] [Accepted: 08/26/2007] [Indexed: 12/23/2022]
Abstract
OBJECTIVES The aim of this case control study was to evaluate whether periodontitis was associated with peripheral arterial disease (PAD). SUBJECTS AND METHODS Twenty-five patients diagnosed with aorto-iliac and/or femoro-popliteal occlusive disease and thirty-two generally healthy control subjects were enrolled in this study. Polymerase chain reaction (PCR) was used to identify Porphyromonas gingivalis, Treponema denticola, Actinobacillus actinomycetemcomitans, Prevotella intermedia, Cytomegalovirus (CMV), Chlamydia pneumoniae, and Helicobacter pylori in tissue specimens taken from the anastomotic site of distal bypasses. Periodontal status was evaluated; serum IgG titres against the four listed bacteria were measured. RESULTS Periodontopathic bacteria were detected in 13/25 (52%) atherosclerotic specimens. CMV or C. pneumoniae was detected in 1/25 (4%) specimens; H. pylori was not detected from any of these specimens. Fontaine grade III or IV patients showed higher detection frequency of P. gingivalis than Fontaine grade II patients (57.1% vs 22.2%, P=0.09). After adjusting for age, gender, diabetes and smoking, periodontitis increased 5-fold the risk of having PAD (OR 5.45). There were preliminary indications that periodontitis was associated with increased serum IL-6 and TNF-alpha concentrations. CONCLUSIONS This study suggests that periodontitis may be associated with an increased risk of PAD. This association could result from the increased concentration of serum inflammatory cytokines in those with periodontitis.
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Affiliation(s)
- Y-W Chen
- Periodontology, Department of Hard Tissue Engineering, Graduate School, Tokyo Medical and Dental University, Yushima, Tokyo, Japan.
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69
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Dye BA, Thornton-Evans G. A brief history of national surveillance efforts for periodontal disease in the United States. J Periodontol 2007; 78:1373-9. [PMID: 17608609 DOI: 10.1902/jop.2007.060210] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
National efforts directed toward improving our understanding of the epidemiology of periodontal disease began nearly a half century ago following the development of Russell's periodontal index (PI). United States Public Health Service agencies began national surveillance activities for periodontal disease with the first National Health Examination Survey in 1960 to 1962, and this continued periodically through 2004 in the National Health and Nutrition Examination Survey (NHANES). Periodontal disease status was assessed by using the PI in the earlier national health surveys, but beginning in the 1980s, direct measures for clinical attachment loss were made in national health surveys and continued through 2004 in NHANES. This article provides a general history of the development and implementation of national surveillance efforts for periodontal disease from the mid-1950s to 2005. It also provides brief background information on the factors that have influenced these national surveillance efforts.
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Affiliation(s)
- Bruce A Dye
- National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, MD 20782, USA.
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70
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Yamazaki K, Honda T, Domon H, Okui T, Kajita K, Amanuma R, Kudoh C, Takashiba S, Kokeguchi S, Nishimura F, Kodama M, Aizawa Y, Oda H. Relationship of periodontal infection to serum antibody levels to periodontopathic bacteria and inflammatory markers in periodontitis patients with coronary heart disease. Clin Exp Immunol 2007; 149:445-52. [PMID: 17645769 PMCID: PMC2219327 DOI: 10.1111/j.1365-2249.2007.03450.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Several reports have demonstrated a possible association of periodontal infections with coronary heart disease (CHD) by elevated antibody titre to periodontopathic bacteria in CHD patients compared with non-diseased controls. Although each periodontopathic bacterium may vary in virulence for periodontitis and atherosclerosis, antibody response to multiple bacteria in CHD patients has not been understood fully. Therefore, serum levels of antibody to 12 periodontopathic bacteria together with other atherosclerotic risk markers were compared among 51 patients with CHD, 55 patients with moderate to severe chronic periodontitis and 37 healthy individuals. The antibody response was the most prevalent for Porphyromonas gingivalis, a major causative organism, in CHD as well as periodontitis patients. However, antibody positivity was different between CHD and periodontitis if the response was analysed for two different strains of P. gingivalis, namely FDC381 and Su63. While periodontitis patients were positive for both P. gingivalis FDC381 and Su63, a high frequency of antibody positivity for P. gingivalis Su63 but not for FDC381 was observed in CHD patients. The results indicate that the presence of particular periodontopathic bacteria with high virulence may affect atherogenesis. Identifying the virulence factors of P. gingivalis Su63 may gain insight into the new therapeutic modality for infection-induced deterioration of atherosclerosis.
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Affiliation(s)
- K Yamazaki
- Laboratory of Periodontology and Immunology, Department of Oral Health and Welfare, Niigata University Faculty of Dentistry, Niigata, Japan.
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Pussinen PJ, Tuomisto K, Jousilahti P, Havulinna AS, Sundvall J, Salomaa V. Endotoxemia, immune response to periodontal pathogens, and systemic inflammation associate with incident cardiovascular disease events. Arterioscler Thromb Vasc Biol 2007; 27:1433-9. [PMID: 17363692 DOI: 10.1161/atvbaha.106.138743] [Citation(s) in RCA: 190] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
OBJECTIVE In periodontitis, overgrowth of gram-negative bacteria may cause endotoxemia and systemic inflammation leading to cardiovascular diseases (CVD). We investigated in a prospective study the associations of serum endotoxin, antibodies to periodontal pathogens, and inflammation markers with the risk of incident CVD. METHODS AND RESULTS The FINRISK 1992 cohort of 6051 individuals was followed up for 10 years. We examined 185 incident CVD events and a control cohort of 320 individuals using a prospective case-cohort design. High antibody response to periodontal pathogens independently predicted incident CVD events with hazard ratios (HR, quartile 4 versus quartiles 1 to 3, 95% CI) of 1.87 (1.13 to 3.08). The subjects with a high antibody response and high CRP or interleukin (IL)-6 had multivariate-adjusted HRs of 3.01 (1.27 to 7.09) and 3.11 (1.42 to 6.83) compared with low-responders, respectively. The corresponding HRs for high endotoxin concentration were 1.82 (1.22 to 2.73, alone), 3.92 (1.99 to 7.74, with CRP), 3.54 (1.78 to 7.03, with IL-6), and 2.26 (1.13 to 4.52, with tumor necrosis factor (TNF)-alpha) after adjusting for age and gender. These associations were abolished after adjusting for serum lipids. High endotoxin/HDL ratio, however, had a multivariate-adjusted HR of 1.92 (1.19 to 3.08) for CVD events. CONCLUSIONS Our results suggest that the exposure to periodontal pathogens or endotoxin induces systemic inflammation leading to increased risk for CVD.
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Affiliation(s)
- Pirkko J Pussinen
- Institute of Dentistry, University of Helsinki, Haartmaninkatu 8, PO Box 63, FI-00014 Helsinki, Finland.
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Lalla E, Kaplan S, Chang SMJ, Roth GA, Celenti R, Hinckley K, Greenberg E, Papapanou PN. Periodontal infection profiles in type 1 diabetes. J Clin Periodontol 2007; 33:855-62. [PMID: 17092237 DOI: 10.1111/j.1600-051x.2006.00996.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVES We investigated the levels of subgingival plaque bacteria and serum IgG responses in patients with type 1 diabetes and non-diabetic controls of comparable periodontal status. MATERIAL AND METHODS Fifty type 1 diabetes patients (mean duration 20.3 years, range 6-41) were age-and gender-matched with 50 non-diabetic individuals with similar levels of periodontal disease. Full-mouth clinical periodontal status was recorded, and eight plaque samples/person were collected and analysed by checkerboard hybridization with respect to 12 species. Homologous serum IgG titres were assessed by checkerboard immunoblotting. In a sub-sample of pairs, serum cytokines and selected markers of cardiovascular risk were assessed using multiplex technology. RESULTS Among the investigated species, only levels of Eubacterium nodatum were found to be higher in diabetic patients, while none of the IgG titres differed between the groups, both before and after adjustments for microbial load. Patients with diabetes had significantly higher serum levels of soluble E-selectin (p=0.04), vascular cell adhesion molecule-1 (VCAM-1; p=0.0008), adiponectin (p=0.01) and lower levels of plasminogen activator inhibitor-1 (PAI-1; p=0.02). CONCLUSIONS After controlling for the severity of periodontal disease, patients with type 1 diabetes and non-diabetic controls showed comparable subgingival infection patterns and serum antibody responses.
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Affiliation(s)
- Evanthia Lalla
- Division of Periodontics, Section of Oral and Diagnostic Sciences, College of Dental Medicine, Columbia University, New York, NY 10032, USA.
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Arbes SJ, Sever ML, Vaughn B, Cohen EA, Zeldin DC. Oral pathogens and allergic disease: results from the Third National Health and Nutrition Examination Survey. J Allergy Clin Immunol 2006; 118:1169-75. [PMID: 17088145 PMCID: PMC2065847 DOI: 10.1016/j.jaci.2006.07.029] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2006] [Revised: 06/29/2006] [Accepted: 07/17/2006] [Indexed: 12/29/2022]
Abstract
BACKGROUND The hygiene hypothesis contends that fewer opportunities for infection have led to increases in the prevalences of asthma and other allergic diseases. OBJECTIVE This study evaluated the association between asthma, wheeze, and hay fever and antibodies to 2 oral bacteria associated with periodontal disease. METHODS Data were obtained from the Third National Health and Nutrition Examination Survey. Serum levels of IgG antibodies to Actinobacillus actinomycetemcomitans and Porphyromonas gingivalis were quantified by enzyme-linked immunoassays in 9385 subjects age 12 years and older. The outcomes were current asthma, wheeze, and hay fever. Odds ratios (ORs) representing a 1-log-unit increase in IgG concentrations were estimated with logistic regression. ORs were adjusted for 8 confounders and weighted to represent the US population. RESULTS For each disease outcome, geometric mean antibody concentrations were higher in persons without the disease outcome than with the disease outcome. For a 1-log-unit increase in P gingivalis antibody concentration, adjusted ORs were 0.41 (95% CI, 0.20-0.87) for asthma, 0.43 (0.23-0.78) for wheeze, and 0.45 (0.23-0.93) for hay fever. For A actinomycetemcomitans, those ORs were 0.56 (0.19-1.72), 0.39 (0.17-0.86), and 0.48 (0.23-1.03), respectively. CONCLUSION Consistent with the hygiene hypothesis, higher concentrations of IgG antibodies to P gingivalis were significantly associated with lower prevalences of asthma, wheeze, and hay fever, and higher concentrations of IgG antibodies to A actinomycetemcomitans were significantly associated with a lower prevalence of wheeze. CLINICAL IMPLICATIONS Colonization of the oral cavity by bacteria and other microbes might play a protective role in the etiology of allergic disease.
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Affiliation(s)
- Samuel J. Arbes
- National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC
| | - Michelle L. Sever
- National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC
| | - Ben Vaughn
- National Institute of Environmental Health Sciences, National Institutes of Health, Rho, Inc, Durham, NC
| | - Eric A. Cohen
- National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC
| | - Darryl C. Zeldin
- National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC
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Forner L, Larsen T, Kilian M, Holmstrup P. Incidence of bacteremia after chewing, tooth brushing and scaling in individuals with periodontal inflammation. J Clin Periodontol 2006; 33:401-7. [PMID: 16677328 DOI: 10.1111/j.1600-051x.2006.00924.x] [Citation(s) in RCA: 445] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
UNLABELLED SCIENTIFIC RATIONALE FOR STUDY: Bacteremia occurs with various frequency after oral procedures. Periodontal disease may affect the incidence, magnitude, duration and bacterial spectrum of bacteremia. PRINCIPLE FINDINGS The incidence and magnitude of bacteremia after scaling was significantly higher in periodontitis than in gingivitis patients and healthy control individuals. In periodontitis patients, the magnitude of bacteremia was associated with gingival index, plaque index and number of sites with bleeding on probing, but not with probing pocket depth measurements. PRACTICAL IMPLICATIONS The prevention and treatment of periodontal diseases appear to be crucial for the prevention of bacteremia associated with oral procedures.
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Affiliation(s)
- Lone Forner
- Department of Periodontology, University of Copenhagen, Copenhagen, Denmark
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Czerniuk MR, Górska R, Filipiak KJ, Opolski G. C-reactive protein in patients with coexistent periodontal disease and acute coronary syndromes. J Clin Periodontol 2006; 33:415-20. [PMID: 16677330 DOI: 10.1111/j.1600-051x.2006.00931.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIM To evaluate periodontal disease (PD) influence on changes in high-sensitivity C-reactive protein (hsCRP) concentrations in patients with acute coronary syndromes and coexistent PD. MATERIALS AND METHODS Dental examinations were carried out in a group of 50 consecutive patients, less than 60 years old, hospitalized as a result of acute coronary syndromes. The patients were divided into two groups on the basis of own-constructed combined PD score (group 2: more advanced; and group 1: less advanced PD) as well as clinical attachment loss (CAL) - group 4: CAL >3 mm; group 3: CAL <or=3 mm. Blood samples for hsCRP estimation were taken at admission, after 10/12 days and long term after acute coronary syndromes. RESULTS A statistically significant decrease in hsCRP was observed among three consecutive blood sample examinations in groups 2 and 4, whereas it was only seen between examination 1 and examination 2 in groups 1 and 3. CONCLUSIONS Although no statistically significant difference of hsCRP was found between studied groups, patients with less advanced PD, either estimated with the use of own-constructed combined score or on the basis of CAL, have significantly longer diminution of inflammatory response monitored with hsCRP concentrations.
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Affiliation(s)
- Maciej R Czerniuk
- Department of Oral Medicine and Periodontal Disease, Warsaw Medical University School, Poland.
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