Subgingival microbiota in health compared to periodon tis and the influence of smoking

PI11/01383 from Carlos III Institute of Health (General Division of Evaluation and Research Promotion, Madrid, Spain), which is integrated in National Plan of Research, Development and Innovation (PN I+D+I 2008–2011). This project was co-financed by European Regional Development Fund (ERDF 2007–2013)

Association between COX-2 rs 6681231 Genotype and Interleukin-6 in Periodontal Connective Tissue. A Pilot Study

This study was partially undertaken at the UCL Eastman Dental Institute, which received a proportion of funding from the Department of Health’s National Institute of Health Research (NIHR) Biomedical Research Centres funding scheme

Association between COX-2 rs 6681231 Genotype and Interleukin-6 in Periodontal Connective Tissue. A Pilot Study

This study was partially undertaken at the UCL Eastman Dental Institute, which received a proportion of funding from the Department of Health’s National Institute of Health Research (NIHR) Biomedical Research Centres funding scheme

Differential Regulation of Circulating Levels of Molecular Chaperones in Patients Undergoing Treatment for Periodontal Disease

British Heart Foundation (grant PG/03/029

Analysis of genetic polymorphisms as risk factors for Aggressive Periodontitis.

This PhD consisted of a series of studies aiming at detecting genetic risk factors for Aggressive Periodontitis (AgP). AgP is a destructive disease of the periodontium affecting around 1% of the population and leading to early tooth loss. Microbiological and environmental factors are thought to act on a genetically susceptible host to determine AgP. We conducted a case-control association study on 224 AgP patients (both Generalised AgP and Localised AgP) and 231 healthy controls to detect differences in genotype distributions of 13 single nucleotide polymorphisms (SNPs). The selected SNPs included FcR and FPR, NADPH oxidase, IL-6, TNF-a and VDR polymorphisms. Further studies on subsets of patients were conducted to detect associations between these SNPs and classical features of AgP: disease severity, familial aggregation, presence of periodontopathogenic bacteria and neutrophil hyperactivity. The NADPH p22phox 242 polymorphism was associated with the AgP trait and with disease severity. The IL-6 -174 SNP was associated with LAgP and with increased detection of periodontopathogenic bacteria. The FcyRIIIb NA polymorphism was associated with GAgP, while FcyR haplotypes were linked with AgP in Blacks and FcyRIIa was associated with familial aggregation of the AgP phenotype. The VDR Taq-I polymorphism showed a trend for association with AgP in smokers. The overall results of the study provide two possible pathogenic pathways leading to AgP: one is mediated through an excessive inflammatory response triggered by the presence of specific bacteria in individuals with hyper-responsive genotypes (NADPH p22phox 242 T allele, FcyRIIIb NA1 homozygosity, IL-6 -174 G homozygosity) the second is initiated by an increased susceptibility to bacterial colonization (FcyRIIa R homozygosity). In conclusion, this study supports the importance of genetic factors in Aggressive Periodontitis and hypothesizes possible pathogenic mechanisms

Heat-shock protein 60 kDa and atherogenic dyslipidemia in patients with untreated mild periodontitis: a pilot study.

Identification of predictors of cardiovascular risk can help in the prevention of pathologic episodes and the management of patients at all stages of illness. Here, we investigated the relationships between serum levels of Hsp60 and dyslipidemia in patients with periodontitis by performing a cross-sectional study of 22 patients with mild periodontitis without any prior treatment for it (i.e., drug naïve) and 22 healthy controls, matched for age and body mass index (BMI). All subjects were evaluated for periodontal status, gingival inflammation, and oral hygiene. Levels of circulating Hsp60, C-reactive protein (CRP), and plasma lipids were measured, and small, dense low-density lipoproteins (LDL) were indirectly assessed by determining the triglycerides/high-density lipoproteins (HDL) cholesterol ratio. We also assessed by immunohistochemistry Hsp60 levels in oral mucosa of patients and controls. No difference was found in CRP levels or plasma lipids between the two groups, but subjects with periodontitis showed, in comparison to controls, higher levels of small, dense LDL (p  = 0.0355) and circulating Hsp60 concentrations (p < 0.0001). However, levels of mucosal Hsp60 did not change significantly between groups. Correlation analysis revealed that circulating Hsp60 inversely correlated with HDL-cholesterol (r  = -0.589, p  = 0.0039), and positively with triglycerides (r  = +0.877, p < 0.0001), and small, dense LDL (r  = +0.925, p < 0.0001). Serum Hsp60 significantly correlated with the degree of periodontal disease (r  = +0.403, p  = 0.0434). In brief, untreated patients with mild periodontitis had increased small, dense LDL and serum Hsp60 concentrations, in comparison to age- and BMI-matched controls and both parameters showed a strong positive correlation. Our data indicate that atherogenic dyslipidemia and elevated circulating Hsp60 tend to be linked and associated to periodontal pathology. Thus, the road is open to investigate the potential value of elevated levels of circulating Hsp60 as predictor of risk for cardiovascular disease when associated to dyslipidemia in periodontitis patients

Expression of gingival crevicular fluid markers during early and late healing of intrabony defects after surgical treatment: a systematic review

Background: Surgical treatments such as guided tissue regeneration (GTR) and access flap surgery are widely employed for the treatment of intrabony defects. However, little is known regarding the postoperative expression of gingival crevicular fluid (GCF) markers. Objective: The aim of this systematic review was to compare the expression of GCF markers following treatment of periodontal intrabony defects with guided tissue regeneration or access surgery. The association of the markers’ expression with the clinical outcome was also assessed. Methods: An electronic literature search was conducted in MEDLINE, EMBASE, OpenGrey, LILACS and Cochrane Library up to December 2018 complemented by a manual search. Human, prospective clinical studies were identified. The changes from baseline up to 30 days (early healing) and 3 months (late healing) were assessed. Results: A total of 164 publications were identified and reviewed for eligibility. Of these, 10 publications fulfilled the inclusion criteria. The included studies evaluated 15 different GCF markers with a follow-up time between 21 and 360 days postoperatively. PDGF, VEGF and TIMP-1 changes were often investigated in the included studies; however, contrasting results were reported. Two studies agreed that both GTR and OFD lead to similar OPG level changes. TGF-β1 is increased early postoperatively, irrespective of the surgical technique employed. Conclusión: There is limited evidence available on the expression of GCF markers after surgical interventions of intrabony periodontal defects. However, OPG and TGF-β1 tend to increase early post-operatively, irrespective of the surgical technique employed, irrespective of the surgical technique employed. Clinical relevance: More well-designed, powered studies with sampling periods reflecting the regenerative process are needed, and future research should focus on employing standardised protocols for collecting, storing and analysing GCF markersS

The effect of a behavioural management tool in adults with mild to moderate periodontitis. A single‐blind, randomized controlled trial

OBJECTIVE: To compare a behavioural management program (test) to a standard communication approach (control) to reduce plaque, improve clinical outcomes and patient's compliance with oral self-care. BACKGROUND: Since psychological factors affect oral health-related behaviours, approaches directed at changing behaviours and improving compliance might improve the effect of oral health education. MATERIALS AND METHODS: This was a randomized, single-blind, parallel-design trial involving 71 patients with mild to moderate periodontitis. During a run-in period, all participants began using a power toothbrush. Two sessions of non-surgical periodontal therapy were performed post-baseline, along with one of the two oral healthcare communication approaches. Plaque and bleeding scores, probing pocket depth (PPD) and clinical attachment level (CAL) were recorded at the screening visit, baseline visit and at 8 and 14 weeks post-baseline. Patients were asked to fill in oral self-care diaries. Experience questionnaires were administered to both clinicians and patients to assess subjective experience of the clinician-patient interactions during the visits. RESULTS: In both groups, a significant reduction in plaque and bleeding scores was observed from baseline to 8 weeks after baseline, which then remained stable at week 14, but no differences between the groups were noted. An improvement in CAL and PPD was recorded at week 8 post-baseline in the test compared to the control group. No inter-group differences in the clinician's and subject's experience questionnaires were observed. CONCLUSION: Both approaches significantly promoted periodontal health. However, changing lifestyle requires repeated communication/engagement over time and a behavioural management program based upon two visits did not provide additional benefit compared to a standard approach

The effect of a behavioural management tool in adults with mild to moderate periodontitis. A single-blind, randomized controlled trial

Objective: To compare a behavioural management program (test) to a standard communication approach (control) to reduce plaque, improve clinical outcomes and patient's compliance with oral self-care. Background: Since psychological factors affect oral health–related behaviours, approaches directed at changing behaviours and improving compliance might improve the effect of oral health education. Materials and Methods: This was a randomized, single-blind, parallel-design trial involving 71 patients with mild to moderate periodontitis. During a run-in period, all participants began using a power toothbrush. Two sessions of non-surgical periodontal therapy were performed post-baseline, along with one of the two oral healthcare communication approaches. Plaque and bleeding scores, probing pocket depth (PPD) and clinical attachment level (CAL) were recorded at the screening visit, baseline visit and at 8 and 14&nbsp;weeks post-baseline. Patients were asked to fill in oral self-care diaries. Experience questionnaires were administered to both clinicians and patients to assess subjective experience of the clinician-patient interactions during the visits. Results: In both groups, a significant reduction in plaque and bleeding scores was observed from baseline to 8&nbsp;weeks after baseline, which then remained stable at week 14, but no differences between the groups were noted. An improvement in CAL and PPD was recorded at week 8 post-baseline in the test compared to the control group. No inter-group differences in the clinician's and subject's experience questionnaires were observed. Conclusion: Both approaches significantly promoted periodontal health. However, changing lifestyle requires repeated communication/engagement over time and a behavioural management program based upon two visits did not provide additional benefit compared to a standard approach