title: Bacteriological evaluation for one-and two-piece implant design supporting mandibular overdenture.
abstract: BACKGROUND
  This study evaluated and compared the bacteriological effect of two-piece implants and one-piece implants in complete overdenture cases on supporting structures.
  
  
  METHODS
  Ten male completely edentulous patients were selected and randomly divided into two equal groups according to the implant design and surgical technique for this study; Group 1: Patients were rehabilitated with complete mandibular overdenture supported by two-piece implants one on each side of the lower arch following two-stage surgical technique and Group 2: Patients were rehabilitated with complete mandibular overdenture supported by one-piece implants one on each side. Evaluation was made at the time of insertion, 6, 12, and 18 months after overdenture insertion, by measuring bacteriological changes around implants abutments.
  
  
  RESULTS
  Complete overdenture supported by one-piece implants showed better effect on the bacteriological changes as compared to that supported by two-piece implants.
  
  
  CONCLUSIONS
  Complete overdenture supported by one-piece implants one on each side of the lower arch showed better effect on the bacteriological changes than using the same prosthesis supported by two-piece implants.
authors.affiliation: Department of Prosthodontics, Faculty of Dental Medicine, Future University, Egypt.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Abdelwahed
authors.affiliation: Department of Restorative, Al-Farabi Collages, Jeddah, KSA.
authors.forename: Ahmed I
authors.initials: AI
authors.lastname: Mahrous
authors.affiliation: Department of Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University, Egypt.
authors.forename: Mohamed Farouk
authors.initials: MF
authors.lastname: Abadallah
authors.affiliation: Department of Microbiology and Parasitological, Faculty of Medicine, King Abdul-Aziz University, KSA.
authors.forename: Hani
authors.initials: H
authors.lastname: Asfour
authors.affiliation: Department of Restorative, Al-Farabi Collages, Jeddah, KSA.
authors.forename: Hussien A
authors.initials: HA
authors.lastname: Aldawash
authors.affiliation: Department of Restorative, Al-Farabi Collages, Jeddah, KSA.
authors.forename: Ebaa I
authors.initials: EI
authors.lastname: Alagha
keywords: One-piece dental implants; overdentures; two-piece dental implants