The influence of occlusal overload on peri-implant bone loss continues to be controversially discussed. Isidor observed in animal experimental examinations on monkays that occlusal overload had a greater influence on the loss of osseointegration of imlants than a plaque accumulation. In five of eight overloaded implants, mobility could be observed between 4.5 and 15.5 months after insertion. In comparision, none of the implants with plaque accumulation lost osseointegration, although an average loss of 1.8mm in the radiographic bone lavel was assessed after 18 months. Rosenberg et al and Sanz et al were also able to differentiate clinically and microbiologically between primary bacterial and nonbacterial caused peri-implant bone resorption. In contrast, the results of the recent study performed in dogs revealed in the case of an uninflamed peri-implant mucosa that implant overloading increased the bone-to-implant contact and only slightly reduced the marginal bone level. However, overloading aggravated the plaque-induced bone rerption when peri-implant inflammation was present. Irrespective of these results, occlusal overload should not exceed the physiological limits of the bone adaptation.
(Frank SCHWARZ, Jurgen BECKER: Etiological factors. Peri-implant infection: Etiology, diagnosis and treatmet 2010; 60-61)