Table of Contents:
Objectives: The aim of this prospective study of partially edentulous patients
treated for generalized chronic and aggressive periodontitis was to evaluate the
three-dimensional marginal bone level around implants 3-15 years after loading.
Material and Methods: 17 generalized aggressive and 17 chronic periodontitis
patients (GAP, GCP) with 119 implants were examined. Implants were inserted
on bone level with a marginal bone thickness of at least 2 mm. The clinical
examination was carried out within a framework of a 3-month recall schedule
after insertion of the superstructure. For analysis of the three-dimensional bone loss and for determination of mucosa thickness, CBCT were taken once 3–15
years after insertion of the superstructure with an aligned tin-foil on the
periimplant soft tissue together with a clinical examination. The Mann-Whitney-test was used for group comparison and the Spearman correlation for the relation between clinical and radiologic parameters. Statistical significance was considered p < 0.05.
Results: The DVT showed in both groups most bone loss vestibular, this was
more pronounced in GAP patients (4,49 ± 2,93 mm) than in GCP patients
(3,57 ± 2,94 mm). In both groups, most bone loss was in the mandible
(GAP: 3,03 ± 1,95 mm; GCP: 2,42 ± 0,97 mm). The thickness of the periimplant mucosa was (GAP: 1,94 ± 1,16 mm; GCP: 2,02 ± 1,14 mm) in the maxilla and (GAP: 1,02 ± 1,04 mm; GCP: 1,06 ± 0,96 mm) in the mandible.
There were significant correlations between clinical parameters (implant age,
bone quality, keratinized mucosa width, GR, AL, GI and PI) and bone loss in the
mandible of GAP patients.
Conclusions: The highest bone loss was observed vestibular in the anterior
mandible. In GAP patients there was a correlation between the mucosal
thickness and bone loss. Plaque-associated inflammation and the width and
thickness of KM seemed to have the greatest impact on bone loss.