الفهرس 
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Abstract
Introduction: InFibra ribbon bar recently introduced as an alternative to the metal bar to act with soft liner as attachment for implant overdentures. Changing the bar design may affect the overdenture retention and the peri-implant tissues.
Aim: This study aims to compare between two different designs of InFibra ribbon bar attachment for implant overdentures, regarding peri-implant tissue changes and overdenture retention.
Material and Methods: Six healthy completely edentulous patients were selected and grouped into two groups. Group I with rounded cross section bar and group II with oval cross section. For each patient two implants were inserted at the canine region, the InFibra ribbon bar was fabricated and inserted then overdenture was constructed and bar housing was relined with soft liner. The peri-implant tissues were clinically evaluated and the mandibular overdenture retention was measured using the digital force gauge at insertion and after 3months.
Results: Data were analyzed using the independent t-test. There was statistically significant difference between round and oval InFibra ribbon bar regarding the peri-implant tissues evaluation indices except plaque index. The oval InFibra ribbon bar design preserves the peri-implant tissues in comparison to the round design. No statistically significant difference in the overdenture retention between the two bar design although the rounded design offers slightly higher retention.
Conclusion: The oval infibra ribbon bar is preferred over the round one for complete overdenture as it permits a good retention with preservation of the peri-implant tissues.