Purpose: to compare the effect of different locator abutments height on peri-implant tissue health in retained mandibular overdenture.
Material and method: Twelve completely edentulous patient were selected to this study. Each patient will received two implant in the canine area of the mandibular arch using early loading protocol. patients were grouped as follow: Group I: the locator abutment height is 1mm. Group II: the locator abutment height is 2mm. Group III: the locator abutment height is 3mm.clinical evaluation were carried out at the time of insertion(T0),3 months(T3),6 monthes (T6) after insertion.
Results: there was statistically significant increase in plaque index and probing depth between group 1mm, 2 mm and 3 mm in different period 3and 6 monhts except mesial side after 3months.there was statistically insignificant decrease in bleeding on probing.
Conclusion: locator abutment showed favorable peri-implant tissue health especially group I better than group Ⅱ and group Ⅱ is better than group IⅡ.