To compare the treatment outcome of 4 vs. 6bar-connected implants in the posterior region of the maxilla to support an overdenture during a 1-year follow-up period.
Materials and methods
Sixty-six edentulous patients with an insufficient amount of bone volume in the maxilla to place implants were asked to participate in this study. Randomization assigned patients to either 4 or 6 implants. In all patients, a maxillary sinus floor elevation procedure with bone from the iliac crest was performed, and after a 3-month healing period, 4 or 6 dental implants were inserted in the maxillary posterior region in a one-stage procedure. After 3months of osseointegration, a bar-supported overdenture was constructed. Implant survival, overdenture survival, clinical scores, peri-implant bone height changes and patients' satisfaction were assessed. Study analysis was performed according a non-inferiority design.
All patients completed the one-year follow-up. After a functional period of 1-year, implant survival was 100% in the 4 implants group and 99.5% in the 6 implants group. Overdenture survival was 100% in both groups. Mean clinical scores were very low and did not significantly differ between groups. Mean marginal bone resorption was 0.35 +/- 0.31mm and 0.46 +/- 0.34mm in the 4 and 6 implants group, respectively. Patients' satisfaction improved significantly in both groups, but did not differ between groups.
A bar-supported overdenture on 4 implants in the posterior maxillary region is not inferior to an overdenture supported by 6bar-connected dental implants.
- dental implants
- healthy ageing
- ENDOSSEOUS IMPLANTS
- RETROSPECTIVE EVALUATION
- RETAINED OVERDENTURES
- EDENTULOUS PATIENTS
- PLANNED MAXILLARY