I.S.S.N 0070-9484 www.eda-egypt.org EGYPTIAN DENTAL JOURNAL Vol. 64, 1733: 1736, October, 2018 * M. B. Dent 2002, Faculty of Dentistry, Mansoura University ** Assistant Professor of Removable Prosthodontics, Faculty of Dentistry, Mansoura University *** Lecturer of Removable Prosthodontics, Faculty of Dentistry, Mansoura University INTRODUCTION Improvements in the socio-economic conditions and general health of people living in developed countries have led to a progressively aging population. Currently, although teeth are lost later, the longevity of the population has meant an increase in the number of prosthetic oral rehabilitation procedures, including full dentures. (1) THE INFLUENCE OF TWO ATTACHMENT TYPES AND STANDARD INTER-IMPLANT DISTANCE ON RETENTION OF MANDIBULAR IMPLANT OVERDENTURES Asaad Ragab Mohamed Kandel * , Nesreen Elmekawy ** and Ahmed Khalifa Khalifa *** ABSTRACT Purpose: assessment of the infuence of attachment types and standard inter-implant distance on retention of mandibular implant overdentures Material and methods: Twelve fully edentulous patients were enrolled for this study. Conventional complete dentures were made and duplicated into stereolithographic surgical guide using CBCT. According to implant planning, each patient received two anterior mandibular implants placed at the anterior region bilaterally with inter implant-distance 19 mm . After 3-4 months osseointegration period, OTEquator attachments were screwed to the implants for group A and Locator attachment were screwed to implants for group B, and matrices were picked-up into the mandibular overdenture. The retention of the mandibular overdenture was evaluated before insertion (T0),at time of insertion of mandibular over-denture (T1), three months after insertion (T3 Results: Comparing the retentive forces of the prosthesis at different periods of study, there was statistically signifcant decrease in retention measurements before over denture insertion, signifcant increase in retention at time of insertion of overdenture Also a signifcant increase of retention after 3 months from denture insertion was observed Conclusion: Two implant overdenture with OTEquator and Locator attachments could be a reliable treatment option for edentulous mandible in this short term study . KEYWORDS: Two implants, OTEquator attachment, locator attachment, mandibular overdenture.