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The aim of the study is to evaluate the proximal contact tightness (PCT) between single-tooth implant-supported prosthesis (ISP) and the adjacent natural teeth with and without the intervention of the Essix retainer at the end of 1 year. -experimental study. Forty patients with a single ISP in the first molar region of the mandibular arch are included in the study who were randomly divided into two groups - Group I (2 those without an intervention of Essix retainer and Group II (2 those with the intervention of Essix retainer (2 mm thickness) (Thermo Va