抄録
The purpose of this study was to determine whether clinical success can be achieved with immediate loading in the edentulous maxilla and mandible with Brånemark implants (Nobel Biocare, Goteborg, Sweden) at one year after placement of the implants.
The study sample consisted of 18 patients who were edentulous or about to lose all remaining teeth. A total of 118 fixtures were placed in 7 maxillae and 12 mandibles, including one bimaxillary patient. Ninety seven of the 118 fixtures were immediately loaded and 21 fixtures were submerged. Five to 7 fixtures (mean of 5.9 fixtures) supported the prostheses in the maxilla and 4 or 5 fixtures (mean of 4.7 fixtures) in the mandible. All fixtures immediately loaded were placed in the incisor and premolar regions of both maxilla and mandible. The mean lengths of the fixtures in the maxillae and mandibles were 14.8±1.8 mm and,15.6±2.6 mm, respectively.All of 41 immediate loading fixtures in the maxillae showed a placement torque of more than 35 Ncm. Although 5 of 56 fixtures in the mandibles showed a placement torque of 30 Ncm, remaining fixtures showed more than 35 Ncm. Provisional implant-supported fixed prostheses were fabricated in a laboratory from an impression and were placed on the next day after surgery. After a 4-to 7-month healing period, a definitive prosthesis was fabricated and placed. One implant, although still osseointegrated, was removed owing to bone resorption. In the patient, the provisional prosthesis was supported by 4 remaining fixtures;thus the cumulative survival rates for fixtures and prostheses were 99.0%and 100%, respectively, after one year.
This clinical report suggests that immediate loading of implant-supported fixed prostheses in the edentulous maxilla and mandible can be a safe and successful treatment as long as patients are carefully and strictly selected.
