抄録
We often encounter cases in which quality and quantity of bone is not adequate for implants due to bone resorption caused either by long-lasting severe periodontal disease or by dentures of poor fit. The maxillary sinus continues to expand with aging, and sinus expansion is accelerated when the maxilla becomes edentulous. As a result adequate bone for implants often remains only in the area of the cupid and maxillary tuberosity.
We have applied osseointegrated ITI Implants in maxillary tuberosity and have used them as distal abutments for superstructures. The following findings have been obtained by examination of 36 cases;
1. It is useful to use osseointegrated implants in the maxillary tuberosity when there is an inadequate amount of bone for implants.
2. Though implant surgery in the maxillary tuberosity is relatively difficult, satisfactory results can be achieved in general practice, provided that thorough X-ray examination and study model analysis are made preoperatively and careful surgical procedures are performed with the use of pilot holes.
3. In case the mucosa in the maxillary tuberosity is thickened, as is often observed,it should be reduced during implant surgery.
4. Even if the direction of implant insertion is slightly inclined, osseointegrated type of implants will have no clinical occlusion problem, when they are loaded with occlusal force.
5. There will be no problem in connecting osseointegrated implants and natural teeth with a fixed prosthesis, provided that natural teeth to be connected with implants are in good periodontal conditions and the purpose of connection is to increase the number of connected teeth.
6. T-scan system is a valuable method implant sinking detection.
