الفهرس 
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Abstract
Twenty one completely edentulous patients were selected from the outpatient clinic, prosthodontic department, Faculty of dentistry, Ain Shams University to participate in this study. The patients were selected and examined carefully to reduce the human variables that may affect the results of this study.
Cone Beam Computed Tomography (CBCT) was carried out for all patients to assess the bone quality of the mandibular alveolar ridge to locate the position of the mental foramina, and to evaluate the available bone width and height at the inter-foraminal region.
All the selected patients were treated by conventional maxillary complete dentures and mini-implant retained mandibular overdentures. Standard clinical and laboratory techniques were followed for the construction of the dentures for all patients.
The patients participated in this study were divided randomly into three equal groups. group I (seven patients): The patients of this group rehabilitated with two un-splinted mini-implants of 2.4mm diameters and 13mm lengths (on the canine regions) retaining mandibular overdentures opposed by conventional maxillary complete dentures
group II (seven patients): The patients of this group rehabilitated with three un- splinted mini- implants of 2.4mm diameters and 13mm lengths (on the canine regions and midline) retaining mandibular overdentures opposed by conventional maxillary complete dentures.group III (four implants) was detected. This change was statistically non significant, this amount of bone loss was within the accepted range that occurs within the first year.
The bone loss around the implants for group I (two implants) was greater than that for group II (three implants) and for group III it showed the least bone loss at all follow-up periods, the difference between the average bone losses of all aspects around the implants of the three groups was statistically non significant.
Posteriorly, It was found that the bone loss for group I(two implants) was the highest then group II(three implants) and then group III (four implants) was the least, but this difference in the bone loss at the posterior residual ridge was statistically non-significant.