Purpose: The primary aim of this longitudinal prospective study has been to determine whether conventional or implant supported dental prosthesis and current surgical reconstructive procedures restore patients oral function and quality of life to their status prior to the ablative oral cancer surgery.The study was designed to compare conventional dental(CD)prosthesis and implant retained dental(ID)prosthesis in subjects scheduled to undergo a maxillectomy.Hypothesis included:(1)the CD restores oral functions and perceptions to pre-cancer levels;(2)the ID restores oral functions and perceptions to pre-cancer surgery levels; and(3)the CD and ID are equally effective in restoring oral functions and perceptions.The primary outcome variable was defined as masticatory performance.