الفهرس 
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Abstract
Objectives: The aim of this study was to evaluate the clinical outcomes and implant stability changes associated with immediately loaded implants of two different types inserted in posterior maxilla. Patients and methods: Twenty patients were selected for prosthetic replacement of missed maxillary posterior single tooth by dental implant and divided randomly into two equal groups. group Ⅰ (Control group): Ten patients receiving 10 implants of conventional thread design inserted in posterior maxilla with immediate loading. group Ⅱ (Study group): Ten patients receiving 10 implants of specific wide knife-edge thread design inserted in posterior maxilla with immediate loading. Clinical evaluation of implant stability was performed at the time of implant insertion and at the 3rd, 6th and 9th week then after 3 and 6 months. Peri-implant Probing Depth (PPD) and Modified Sulcus Bleeding Index (mSBI) were evaluated after 3 and 6 months post-operatively. Radiographical evaluation of marginal bone level (MBL) and relative bone density (BD) were performed immediately postoperative and after 6 months of implant loading using CBCT. All clinical and radiographic data were subjected to statistical analysis. Results: There were statistically significant differences between both groups regarding implant stability at time of implant insertion only (P<0.001) and palatal relative BD immediately postoperative (P=0.023). However, there were no statistically significant differences regarding PPD (P=0.287 and 0.904), mSBI (P=0.760 and 0.277), MBL (P=0.762 and 0.880), buccal relative BD (P=0.705 and 0.289), palatal relative BD after 6 months (P=0.130) and implant stability (P=0.279, 0.657, 0.852, 0.317 and 0.297) at successive follow up periods. Conclusion: Although modification of implant threads macro-design can result in short term improvement of primary stability by reducing lag phase, however no further superior impact was revealed on other clinical parameters.