الفهرس 
The Problem of EdentulismOnly 14 pages are availabe for public view
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Abstract
The study was carried to evaluate and compare the effect of two implant–supported overdenture designs: mandibular overdenture supported by four implants placed in the interforaminal region and mandibular overdenture supported by four implants placed in the canine and molar regions bilaterally on the peri–implant supporting tissues by measuring bone height and bone density.
Eight completely edentulous male patients were precisely selected from the out-patient clinics of the Armed Forces hospitals. Patients were rehabilitated by mucosa supported maxillary complete denture and implant supported mandibular overdenture. Standard clinical and laboratory techniques were followed for denture construction for all patients. According to the position of implants patients were divided into two equal groups:
Group (1): Four implants were installed in the interforaminal area of the mandible; two implants on each side and the other two were installed in-between.
Group (2): Two implants were installed in the canine area and the other two were installed in the first molar area bilaterally.
Surgical installation of the implant took place under strict aseptic conditions and delayed loading protocol was followed.
Patients were recalled frequently for post-insertion inspection and adjustments. Follow-up visits were scheduled at time of denture insertion, six, twelve and eighteen months after insertion for inspection of the prosthesis and radiographic evaluation of the peri-implant supporting structures using a digital panoramic machine.
Results showed that there was a significant increase in crestal bone height loss and bone density in the implants supporting structures in both groups. However, no statistically significant difference could be detected between the two groups.