Image Study Of Site Preservation After Extraction Of Mandibular Molars

Objective:1.By accurately locating the research plane of CBCT,using the data and image to explore and compare the changes of alveolar bone height and texture after the implementation of site preservation and conventional healing.To enhance clinicians' understanding of site preservation and make them understand the relevant imaging performance after site preservation.2.This study provides theoretical basis for the direct relationship between implant retention and image.Methods:According to the inclusion and exclusion criteria,88 patients from January 2016 to January 2018 were selected from the picture archiving and communication systems database of cone beam computed tomography(CBCT)PACS(picture archiving and communication systems)of West China Dental Hospital of Sichuan University.93 mandibular molars were extracted,including 34 of which were conventionally healed,30 of which were the first and second molars and 29 of which were the third molars.29 third molars were excluded(29 of them were mandibular third molars,so they were excluded due to the interference of mandible).The location plane was located in the center of alveolar fossa.The height of buccal,middle and lingual alveolar bone was measured before and 6 months after the operation,and the morphology and texture of alveolar bone were observed The data collected were analyzed statistically.Results:The changes of alveolar bone in buccal,middle and lingual sites were statistically significant between the two groups(P < 0.05).The shape and density of alveolar bonewere significantly different between the two groups(P < 0.05).The changes of alveolar bone in buccal,middle and lingual sites were statistically significant between the two groups(P < 0.05).The shape and density of alveolar bone were significantly different between the two groups(P < 0.05).Conclusion:Compared with the conventional healing after extraction,site preservation can preserve and form more alveolar bone.Different types of image can reflect the characteristics of site preservation and provide certain imaging reference for clinical implant therapy.