To assess the wear of Zirconia-PEEK versus cobalt-chromium-PEEK telescopic attachments for implant retained complete mandibular overdenture. The wear of Zirconia-PEEK telescopic attachments can affect the retention of implant retained complete mandibular overdenture.
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the mean wear values
Timeframe: at baseline
the mean wear values
Timeframe: after 3 months interval
the mean wear values
Timeframe: after 6 months interval