الفهرس 
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Abstract
This study was carried out to evaluate the effect of two different
types of dental Implants abutments on supporting structures surrounding
dental implants supporting mandibular overdentures .
Ten males patients completely edentulous patients whose ages
ranged between 50-62 were selected from out-patients clinic of Faculty of
Dentistry, Suez Canal University. The selected patients were suitable for
implant inclusion criteria.
All patients received two dental implants supporting mandibular
complete overdenture opposed to maxillary complete denture. The
selected patients were randomly classified according to the type of
implants inserted into two equal groups.
group (a): received mandibular over-denture supported by two
platform switched dental implants inserted in the canine area.
group (b): received mandibular over-denture supported by two nonplatform switched dental implants inserted in the canine area.
Radiographic evaluation of marginal bone height changes and the
bone density around the dental implant were carried out using Cone beam
computed topography (CBCT) for every patient of both groups were
recorded at three months intervals up to twelve months (3,6,9&12).
The results of the study showed that in the group (A) bone height
changes were statistically significant in the first follow up period (3
months) and was statistically insignificant in the rest of the follow-up
period same results were found in group (B), while bone density changes
for group (A) and (B) were statistically insignificant.
Summary &Conclusion
There were statistically .