抄録
From July 1992 to December 1998, maxillary sinus floor augmentations using autogenous bone grafts combined with simultaneous implant installation were performed on 14 sinuses from eight patients at the First Department of Oral and Maxillofacial Surgery of Tsurumi University.
The eight patients, including three males and five females, ranged from 38 to 64 years of age, with a mean of 52 years old. The surgical procedure performed was bilateral sinus floor augmentation in six patients, and unilateral sinus floor augmentation in two. The grafted bone was obtained from the iliac crest in seven patients, and from the mentum in one. ITI Bonefit solid screw implants were used in seven cases, and Branemark standard fixtures were used in one case. In total, 55 fixtures were applied, with 45 of these being implanted in the maxillary molar region,
One fixture was removed at a secondary operation due to failure to achieve osseointegration, and another one was kept under sleeping condition because of an undesirable position for prosthodontic treatment. The remaining 43 fixtures have been still in place.
CT image findings revealed that the grafted bone of the upper part of the fixture apex disappeared within one year. However, minimum resorption was observed, and sufficient bone contact was maintained around the fixture body in cases after a lapse of from five to two years. In our first case, machine surfaced fixtures were used,with the result that relatively remarkable bone resorption was observable around the fixtures seven years postoperatively.
