Bone loss at implants and teeth in thesame segment of the dentition in partially dentate subjects

BackgroundSome studies have indicated that marginal bone loss at implants and at teeth are similar, while results from other studies showed that implants lost more bone than teeth in the same dentition. AimTo determine the amount of progressive marginal bone loss that had occurred at implants and teeth in the same segment of the dentition following implant placement in partially dentate subjects. Material and MethodsA total of 217 patients with a total of 573 implants and 318 teeth present in the same segments of the dentition were included. Radiographs were available from 1year (baseline) and 3years after loading. ResultsThe mean bone loss that occurred between the two examinations was at implants 0.420.68mm and at teeth 0.44 +/- 0.52mm. Thirty-eight subjects (18%) had 1 implant exhibiting >1mm bone loss. Bone loss at the 148 implants in this category of patients was 1.30 +/- 1.04mm with a corresponding loss at the 69 teeth of 0.53 +/- 0.62mm. Eighteen subjects (8%) had 1 tooth that exhibited >1mm bone loss. The mean amount of bone loss in this sample was 1.37 +/- 0.87mm (38 teeth) and 0.29 +/- 0.31mm (56 implants). ConclusionsThis study showed that marginal bone loss at implants and teeth in many partially dentate subjects might be independent phenomena.