الفهرس 
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Abstract
This study aimed to evaluate the peri-implant soft tissue health of four implant supported mandibular overdenture retained with bilateral posterior bars to compare between the effect of clips and resilient liners.
Materials and methods:
For each patient, four acid etched roughened titanium screw type implant fixures were surgically inserted in the canine and first molar areas bilaterally. Bar abutments were screwed in to their fixures. Two abutments on each side were splinted with a prefabricated Dyna Instant Adjusting Bar within 24 hours after surgery. The patients were randomly classified in to two equal groups according to the method of retention as follows: Group I: including patients having mandibular overdentures retained to the bar with clips and Group II: including patients having mandibular overdentures retained to the bar with silicone resilient liners.
The peri-implant tissue health was investigated in the aspects of peri-implant probing depth, peri-implant bleeding index, peri-implant plaque index and implant mobility three, six and nine months after insertion of definitive mandibular overdenture.
Conclusion:
1. Regarding the per-implant soft tissue health, resilient liners may be considered better than the bar-clips when used with bilateral posterior bars for retaining implant supported mandibular overdentur.
2. Although splinting action of the bilateral posterior bars, they cannot be proposed as a promising design for supporting mandibular overdenture.
3. Implants inserted in the canine areas provide better stability and tissue health than those inserted in the first molar areas.