الفهرس 
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Abstract
Purpose: This study aimed to compare between using four conventional implants in the inter foraminal region, and using four implants (two in the anterior region and two short implants in the posterior region) retaining fixed detachable mandibular dentures regarding implant stability.
Materials and methods: Fourteen patients with completely edentulous patients were selected for this study and divided into two groups. group A was including seven patients. Each patient was rehabilitated with four equidistant implants in the inter foraminal region (two on each side of the mid line) retaining mandibular fixed detachable denture. group B was including seven patients. Each patient was rehabilitated with four implants (two conventional were inserted in the inter foraminal region and two short implants were inserted on each side at the first molar regions) retaining mandibular fixed detachable denture. Immediate loading was done. Implant stability was evaluated using osstell at time of insertion, after two months and after four months. Numerical data were explored for normality by checking the distribution of data. All data showed parametric distribution. Data were presented as mean and standard deviation (SD).Independent sample t-test was used to compare between two groups in non-related samples. Repeated measure was used to compare between more than two groups in related samples.
Results: group A showed higher implant sability ( mean and standard deviation) compared to group B. However, t-test showed no statistical significant difference. Also, there was an increase in implant stability through out the study period.
Conclusion: from the result obtained from this study, it could be concluded that: Implants stability have no relation with their distribution or length. So, using of short implants in the resorbed posterior mandible is a reliable treatment option.
Key words: Short implant, fixed detachable denture.