Investigation of crestal cortical bone thickness and cancellous bone density in posterior sites of mandible with CBCT

Abstract

Background: A dental implant is a type of fixed partial denture (FPD) that can be used to restore a missing tooth1, and computed tomography (CT) and cone-beam computed tomography (CBCT) assesses bone quality such as crestal cortical bone thickness and cancellous bone density during the development of an implant treatment plan. The initial stabilization of the implant is directly related to the cortical bone thickness, and the basis for our study was to determine the difference in the cortical bone thickness of the anterior and posterior sites for the mandible. Aim: Investigation of cortical bone thickness, cancellous bone density in posterior sites of the mandible with cone-beam computed tomography Materials and Methods: We reviewed the CBCT imaging of 40 patients who were examined in the mandibular region by CBCT. The study was performed using random sampling and a retrospective survey design from CBCT images. Dental CBCT images were obtained using the HDX Will Dentri 3 CBCT device by the following specifications: 85kVp 7mA. We measured the CBCT images in OnDemand3DApp 3D software. Measurements were made by measuring the cortical bone thickness (mm), cancellous bone density (HU) at a distance of 3.5 mm from the implant placement site 1.5 mm from the adjacent tooth and The results of the study were processed using SPSS22 software. The difference between the values of the parameters was assessed by the Independent Sample T-test and the correlation was evaluated by the Pearson correlation coefÏcient. Significance level was defined as 0.05. A total of 40 people were investigate and an average age is 37. Results: The posterior sites average value of the cortical bone thickness of the mandible is 1.445 [0.28], which is p=0.036 (p<0.05) are statistically significant differences. The mean cancellous bone density in posterior site of mandible outside of implant was 572.84 HU, inside of the implant was 526.07 HU, which is p=0.024 (p <0.05) are statistacally significant differences. Conclusion: 1. The average value of upper crestal cortical bone thickness of the mandibular molars are 1.445 [0.48] mm, which is considered suitable index for implant placement 2. The average value of bone density of the mandibular molars is 572.84 HU outside the implant and 526.07 HU inside the implant, which is suitable index for implant. 3. There was a strong linear relationship between the cortical bone thickness and cancellous bone density in the mandibular region.