الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
This prospective study was carried out to compare the survival of dental implants in irradiated and non-irradiated patients with maxillectomy defects. Sixteen patients (10 males and 6 females) were selected having at least three missing teeth in the intact portion of the remaining alveolar ridge after maxillary resection.
The selected patients were divided into two groups; group 1 (non-irradiated) and group 2 (irradiated). Following careful diagnosis and treatment
planning, all patients of both groups received three dental implants on the first stage surgery. On the same day, primary implant stability was measured using OSTELL device and implant bone level was recorded radiographically using paralleling technique and a preformed radiographic stent.
Implants were left submerged for six months and during this period obturators were totally relieved at the site of implants to minimize trauma. Both groups were clinically observed for any signs of early failure while only (group 2) was observed for the onset of any signs of osteoradionecrosis.
Patients of both groups were recalled after six months for the second stage surgery and evaluation of implant survival, stability and bone level measurement. All implants were surgically exposed after which implant stability and bone level were recorded as before. Additionally, survival was evaluated subjectively, however, osseointegrated implants with absent clinical signs and symptoms were considered survived. Healing abutments were then attached and temporary obturators were relieved at abutments’ sites.
Ten days later, special trays were constructed on study casts and the final maxillary impression was done using the direct splinted open tray technique after attaching the implant impression abutments. Metal bar was fabricated on the master cast using plastic burnout implant abutments over which clip attachments were attached for prosthesis retention. After surveying and mouth preparation, the metal framework was fabricated and tried in patients’ mouth after which a bite registration record was obtained. Following teeth arrangement and try in procedures, the finished obturator was delivered using the direct pickup technique.
After 12 months, all patients of both groups were recalled for evaluation of implant survival, implant stability, bone level measurement, and occurrence of osteoradionecrosis. Finally, all data collected during the follow up period was recorded, tabulated and statistically analyzed.
Statistical analysis of the collected data showed that the difference within each group and between the two groups was insignificant regarding the implant survival, and bone change around dental implants. Regarding the implant stability, the difference between the two groups was statistically significant only at the time of implant placement while insignificant during the follow up periods. Additionally, no signs of osteoradionecrosis was observed during the follow up period.