Correlation between Bone Density and Primary Implants Stability in Implant Retained Mandibular Overdenture

Abstract

This in- vivo study was carried out to evaluate the correlation between bone density and primary implant stability in implant retained mandibular overdenture by using OSSTELL®. Fourteen completely edentulous patients were selected from the outpatient clinic, Removable prosthodontics Department, Faculty of Dentistry, Ain Shams University to participate in this study. Patients were precisely selected and thoroughly examined in an attempt to reduce human variables and eliminate any factor that might adversely affect the success of this treatment modality. A pre-operative Computed tomography (CT) was utilized in this study to evaluate alveolar bone height, width and density. Patients were classified into three groups according to bone density at site of implant placement. Group A: patients exhibiting type I (D1) bone density, Group B: patients exhibiting type II (D1) bone density and Group C: patients exhibiting type III (DII1) bone density. The number of the selected patients who exhibited type I bone density was three, as Hounsfield units (HU) ranged from (1255-1350). Six patients exhibited type II bone density, Hounsfield units (HU) ranged from (750-900). Five patients exhibited type III bone density, Hounsfield units (HU) ranged from (568-720). For all patients two implants 4 mm in diameter and 10 mm in length were installed in the canine area following the two stage surgical technique.After preparation of the osteotomy and installation of the