Changes Of Alveolar Bone After Periodontal Initial Treatment In Patients With Periodontitis:a Cone Beam Computer Tomography Study

Objective:To evaluate the accuracy and feasibility of using cone beam computed tomography (CBCT) to measure alveolar bone height and density, and to provide theoretical foundation for clinical application in periodontitis by CBCT.Methods:Eight dry mandibles were scanned by CBCT scanner and measured by EzImplant software in the same condition, and repeated above procedures at an internal of one week.(1) The distance from alveolar ridge crest to cemento-enamel junction were measured on every marker by the images of CBCT and by vernier caliper respectively. The difference between two methods was compared and the repeatability of the intra-observer and inter-observer were analyzed.(2) Alveolar bone density on selected region was measured by CBCT and EzImplant software, repeated and saw the difference. The repeatability of the intra-observer and inter-observer were analyzed. All the data were analyzed by statistics software.Result:There was no significant difference between the measurements of alveolar bone height by the CBCT images and by vernier caliper (P>0.05), and the values of ICC were more than0.75for all intra-observer and inter-observer. There was no significant difference between the two repeated measurements of alveolar bone density by the CBCT images, and the values of ICC were more than0.75for all intra-observer and inter-observer as well.Conclusion:The CBCT images could show the three-dimensional relationships between tooth and alveolar bone accurately. CBCT showed good accuracy and repeatability in measuring alveolar bone height, good repeatability and feasibility in measuring alveolar bone density in vitro. Objective:To compare the changes of alveolar bone height and density before and after periodontal initial treatment in patients with chronic periodontitis, and to analyze the influence of periodontal initial treatment on alveolar bone mass.Methods:CBCT scanning were taken before and three months after periodontal initial treatment on twenty patients with chronic periodontitis. Three dimensional images were reconstructed and measured by the EzImplant software. Alveolar bone height and density were compared before and after treatment. All the data were analyzed by statistics software.Result:Measured on the CBCT images, there was no significant change of alveolar bone height before and three months after treatment (P>0.05), but alveolar bone density was significantly increased at three months after treatment (P<0.05).Conclusion:To a certain degree, periodontal initial treatment could accelerate the reparation and regeneration of alveolar bone. It could increase the density of alveolar bone, but could not immediately increase the height of alveolar bone.