Objective To obtain the medical exposure frequency data of residents through a questionnaire survey on mobile phone networks in the community, and to analyze the main influencing factors. Methods A snowball sampling method was used to expand the sampling from medical staff in a county hospital to the community. The questionnaire included personal information such as occupation category, type of medical insurance, and education level as well as basic radiation-related knowledge and medical exposure type and frequency of respondents received in 2021. A logistic regression model was used to analyze the influencing factors of medical exposure. Results A total of 223 respondents were investigated, and 12.56% of them received radiological diagnosis and radiotherapy in 2021. The proportion of males receiving medical exposure was significantly higher than that of females (19.64% vs 10.18%). The likelihood of the person receiving medical exposure increased considerably with age, with the proportion of residents receiving medical exposure at 20, 30, 40, and 50 years of age being 6.25%, 7.95%, 19.23%, and 33.33%, respectively. Of persons who received medical exposure, 57.14% underwent CT scans. Persons participating in the new rural cooperative medical system were likely less to receive radiological diagnosis and radiotherapy than urban workers and residents (OR = 0.55, CI:0.13-2.23, P > 0.05). Conclusion Questionnaire survey in the community can obtain more information about the medical exposure of residents, and age and type of medical insurance are important factors affecting the frequency of medical exposure.

Third molars, late-eruption permanent teeth in humans, have commonly been extracted in clinical treatments. However, with the development of oral medicine, the value of maxillary third molars in clinical treatments, as well as in oral prosthetics, orthodontics, and oral implant applications, has gradually become recognized. This paper summarizes the research on the morphology of the crown, root, root canal and root tip of the maxillary third molar in a review to facilitate related research and clinical treatments.

Objective : To describe a novel workflow for the anterior dental esthetics in immediate implant and immediate aesthetic restoration with digital technique. Methods : Before the implant placement, a intra-oral optical scan(IOS) combined with CBCT was performed to virtually design the 3D implant position and restoration. A surgical guide and an individualized Ti abutment restoration was CAD/CAM-fabricated out of the PMMA-based in a fully digital workflow and seated at the stage of minimal invasive surgery. Results : The technique achieved immediate implant and immediate restoration after tooth extraction. Immediate restoration of temporary crown could be completed immediately in second patient visit after the operation, finally realized the aesthetic implantation with preserved soft tissue contour. Conclusin The fully digital technique changed the conventional workflow which achieves more efficiency and better aesthetic effect.