Splinted teeth did not show significantly increased risk of tooth loss compared with non-splinted teeth (HR; 95% CI: 1.30; 0.87-1.93); while age (1.07; 1.05-1.09), PPD >6 mm (4.24; 1.26-14.31), bone loss (mean HR was 5.07-15.36 depending on severity), tooth location (posterior versus anterior teeth: HR 2.08; 1.24-3.49) and the number of occlusal contact areas (mean HR was 4.38-17.34 depending on the number of antagonistic contact areas) were associated with tooth loss.
Risk of tooth loss was significantly increased in active smokers (HR[95% CI]: 4.94[1.91/12.75]), the upper dental arch (1.94[1,16/3.25]), with each mm of residual PPD (1.41[1.29/1.53]), teeth with furcation involvement (FI) (HR 4.00-4.44 for different degrees) and mobility (5.39 [2.06/14.1] for degree III).