الفهرس 
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Abstract
Summary
The study was carried out to compare radio graphically between vertical bone height changes around trabecular Tantalum metal and conventional dual acid etched implants in edentulous patients rehabilitated with implant retained mandibular complete overdentures.
Fourteen completely edentulous male patients were selected from those attended the out-patient clinic of Removable Prosthodontics Department, Faculty of Dentistry-Ain Shams University to participate in the study.
Patients were precisely selected and thoroughly examined in an attempt to reduce human variables and eliminate any factor that might adversely affect the results of this study.
Selected patients were equally divided into two groups:
group (I): Patients were rehabilitated by implant over dentures supported on two metal trabecular dental implant (Tantalum) in canine region following two surgical stage technique.
group (II): Patients were rehabilitated by implant over dentures supported on two dual acid etched dental implant in canine region following two surgical stage technique.
Standard clinical and laboratory techniques were followed for complete denture construction for all patients.
Surgical installation of the implants was performed under strict aseptic conditions and the implants were delayed loaded using complete mandibular overdentures retained with two ball and socket attachments.
All patients were scheduled for follow up visits to evaluate marginal bone height changes at the mesial, distal, buccal, and lingual sites of each implant using linear measurement system supplied by cone beam computed tomography.
CBCT records were obtained upon implant loading (Baseline), six Months, twelve Months and eighteen Months of follow-up period. The marginal bone loss at different intervals was obtained by calculating the difference in bone height at that interval from the base line measurements.
Statistical data for the current study revealed:
Statistically significant marginal bone loss in both groups for all surfaces and at all intervals during the follow up period except for group (II) patients the lingual surface at 6-12 intervals showing insignificant change.
During the follow up period, the calculated means of the peri-implant bone loss revealed higher marginal bone loss values for group II Patients (dual acid etched implant) when compared to group I patients (Tantalum implants)., the difference between the two studied groups for all surfaces at all intervals during the follow up period was statistically significant. except for buccle and lingual surfaces at 0-6 interval, all surfaces at 6-12 interval, buccle surface at 12-18 interval, buccle and lingual surfaces at 0-12 and 0-18 intervals data revealed insignificant changes.