Our data suggest that subjects with periodontitis, diabetes, and poor oral hygiene were more prone to develop peri-implantitis.

The absence of preventive maintenance in individuals with pre-existing peri-implant mucositis was associated with a high incidence of peri-implantitis. Clinical parameters, such as bleeding on peri-implant probing, periodontal probing depth and the presence of periodontitis were associated with a higher risk of developing peri-implantitis.

IC individuals undergoing PMT presented higher rates of TL when compared to RC individuals. Findings demonstrated the influence of irregular compliance and the importance of monitoring other risk predictors for TL such as smoking, male gender and severity of probing depth during PMT.

Periodontal maintenance programmes in academic environment can stabilize the periodontal condition obtained after active periodontal therapy as well as control the action of risk variables for the progression of periodontitis.

Different periodontitis definitions have been used in periodontal research. This study assessed the impact of case definition on the prevalence and extent rates of periodontitis. A data set including 340 periodontal records, collected in Belo Horizonte, Brazil, was used. Periodontitis was defined as: 1) one site with probing depth (PD) >or= 4 mm; 2) clinical attachment level (CAL) >or= 5 mm in >or= 4 sites + one site with PD >or= 4 mm; 3) CAL >or= 6 mm in >or= 2 teeth + one site with PD >or= 5 mm; 4) >or= 4 teeth with >or= 1 sites with PD >or= 4 mm + CAL >or= 3 mm; 5a) interproximal CAL or PD >or= 4 mm at >or= 2 sites, not on the same tooth; and 5b) interproximal CAL of >or= 6 mm at >or= 2 sites, not on the same tooth + PD >or= 5 mm at >or= 1 proximal site. Definition 5 was determined to be the gold standard and the definitions were compared by means of agreement, sensitivity, specificity, and positive and negative predictive values. Prevalence and extent rates greatly varied, from 13.8% to 65.3% and from 9.7% to 55.6%, respectively. The use of different case definitions has a great impact on the prevalence and extent rates of periodontitis.

Maternal periodontitis is associated with an increased risk for PTB, LBW, and IUGR. Results emphasize the importance of periodontal care in prenatal health programs.

Bacterial frequency increased from peri-implant/periodontal health to peri-implantitis/periodontitis but not from mucositis/gingivitis to peri-implantitis/periodontitis. There was a trend towards higher bacterial frequency in teeth than implants.

Self-reported periodontal measures showed a moderate predictive value for periodontitis prevalence. The use of these measures could be a good strategy in investigating prevalence of periodontal disease.