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The wear rate in eleven retrievals excluding an extremely short excised sample was 0.055 ± 0.020 mm/year in the medial load zone and 0.041 ± 0.020 mm/year in the lateral load zone. Raman spectroscopy proved very useful in separating creep and wear components of thickness reduction, thus revealing the wear rate of the UHMWPE material. The aim of the present laboratory study was to investigate the retentive properties and the wear of three different resin matrix attachments for implant overdentures as well as to assess the effects of im