106 Chapter 7 ABSTRACT Even though implant surgery has become a safe and predictable treatment for replacing teeth, peri-implantitis has evolved to a common condition, which can eventually lead to implant loss. Retreatment with implants is often considered, but is associated with lower implant survival. Current research on implant retreatment is limited, especially considering fully edentulous patients. The aim of this study was to assess implant retreatment in a group of patients whose maxillary implants were all failing after full arch rehabilitation. Materials and methods All consecutive patients referred between 2008 and 2018, following multiple late implant failures in implant-rehabilitated maxillae, were included in the study. Treatment involved implant removal, augmentation and placement of an overdenture supported by four to six implants. 70 implants in 15 patients were evaluated at 3.3±2.5 years (range 1.1-8.6 years) after loading. At time of evaluation, implant survival, complications, clinical parameters, marginal bone level change and patient related outcome measures were recorded. Results The implant survival rate was 95.7%. Three implant failures occurred within the first year of function. The mean marginal bone level change was -0.32±0.46mm. The mean pocket depth was 4.55±1.59mm. Plaque, calculus, inflammation, and bleeding were hardly seen (median score: 0). Patients satisfaction was high (mean overall score 8.7±1.2, max. 10). Chewing soft and tough food was scored as ‘good’, hard food as ‘moderate’. Conclusion It can be concluded that replacement of multiple failing implants in an edentulous maxilla after reconstructive surgery is a safe and predictable treatment procedure when applied as an implant supported overdenture.
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