الفهرس 
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Abstract
Purpose : To evaluate the effect of two different dental implant materials (Titanium _zirconium implant, Titanium implant) retaining reinforced mandibular over denture with early loading protocol on surrounding bone and soft tissue. Material and methods : Six completely edentulous male patients aged 45-65 years were selected for this study. CBCT was used to evaluate bone quantity and quality, accordingly all patient received complete dentures and the mandibular dentures were duplicated with clear acrylic resin to construct radiographic template which was used as a guide in construction of stereolithographic stent by CADCAM. The patients were randomly divided into two equal groups according to implant material. group (I): received two titanium _zirconium implants (Roxolid) and group (II) received two titanium implants. At four weeks after implant placement the lower reinforced complete denture was attached by locators to the implants (Early progressive loading protocol). vertical bone changes were evaluated by parallel periapical long cone Xray technique at T1 after 6 months of insertion, and at T2 after 1year of insertion; and the soft tissue changes were evaluated by modified gingival index (MGI), modified bleeding index (MBI), periimplant pocket depth (PD) measurements immediately at the insertion time of lower overdenture (T0), and (T1) at six months after insertion, (T2) at one year from insertion Results: The result of this study showed that, there was a significant difference in MGI between the two groups at T1 (p =.007). No significant difference in MGI between the two groups at T0 and T2.There was significant difference in MBI between the two groups at T2 (p<.001), no significant difference at T0, T1 observation times. There was no a significant difference in probing pocket depth between the two groups at T0, T1, T2.There was significant difference in vertical bone changes between the two groups at T2 (p=.048) only, at T1 no significant difference. Conclusion: Both (Titanium-Zirconium implants, Titanium implants) showed improved clinical results regarding, probing depth, and vertical bone highet changes after one year follow up. Both types can be used successfully to support implant overdenture, with titanium-zirconium implants more favorable results in all clinical parameters. Early progressive loading protocol could provide satisfactory clinical results similar to conventional loading protocol.