Imaging accurate measurement and three-dimensional finite element analysis of short-term bone resorption after guided bone regeneration implantation in anterior dental region
Objective CBCT was used to accurately measure the bone graft material absorption within 12 months after simultaneous GBR implantation in the maxillary anterior region,and the biomechanical analysis was performed by three-dimensional finite element method.Methods 31 patients with GBR with single anterior tooth implantation were se-lected(central incisor 24 cases,lateral incisor 7 cases).CBCT data of patients immediately after surgery,6 months after surgery and 12 months after surgery were used to measure the lip and palatal bone mass every 1mm depth and analyze the influence of time and depth on the absorption amount of bone graft material.Three-dimensional finite element modeling was carried out for the first time to analyze the deformation rule of the upper lip pressure.Results The average absorp-tion of labial bone graft material at 6 months after surgery was(1.2±2.04)mm,which was 1.64 times of that at 6 months to 12 months after surgery(0.73±1.13)mm.The absorption of bone graft material on the lip was significantly different at 0mm,1mm and 2mm of the implant neck and 7mm,8mm and 9mm of the implant neck,respectively(P＜0.05),and the maximum absorption is 1mm from the neck.Three-dimensional finite element analysis showed that after the simulated upper lip pressure was applied,the bone graft material had the largest shape variable in the neck of the im-plant and gradually decreased with the depth deformation,which was consistent with the CBCT data.Conclusion After simultaneous GBR implantation in the maxillary anterior region,the absorption of bone graft material in the first 6 months is greater than that in the postoperative 6-12 months,and the absorption is mainly in the neck 1/3.Three-dimen-sional finite element analysis proves that the absorption law of bone graft material is related to the pressure of the upper lip.
Guided bone regenerationBone graft materialsAbsorbable collagen membraneImplant teethThree-dimensional finite elements analysisUpper lip pressureCone-beam computed tomographyMaxillary anterior re-gion
万方数据
维普
