Aim: Coronavirus disease (COVID-19) was first to appear in Wuhan, China, in 2019. Being highly contagious, it started to spread rapidly throughout the entire world causing fear and anxiety among all nations with a very high mortality rate. Dentists are considered at an extremely substantial risk to be infected among all health care workers because they are working in close contact with their patients and also because of being regularly exposed to the aerosols, droplets and saliva splashing out of the patients' mouth. Subjects and Methods: This study was based on a questionnaire to assess the knowledge of the graduating dental students about the signs and symptoms of (COVID-19) infection and also to evaluate their awareness about the precautions and infection control measures required during the dental treatment to keep them safe and control the spread of the disease. A well-constructed and validated questionnaire was formed and its link was sent to dental students in all year grades at different universities in Upper Egypt. The data were collected, tabulated, and statistically analyzed by SPSS (Statistical Package for Social Sciences). Results: Result showed significant valued regarding that the dental students have a good understanding of COVID-19 and the precautions. Conclusion: As a result, it was concluded that the dental students have a good understanding of COVID-19 and the precautions that must be taken to provide adequate dental treatment for patients during the pandemic.

Purpose This study aimed to evaluate the anatomic circle around the impacted lower third molar to show, document, and correlate essential findings that should be included in the routine radiographic assessment protocol as clinically meaningful factors in overall case evaluation and treatment planning. Materials and Methods Cone-beam computed tomographic images of impacted lower third molars were selected according to specific inclusion criteria. Impacted teeth were classified according to their position before assessment. The adjacent second molars were assessed for distal caries, distal bone loss, and root resorption. The fourth finding was the presence of a retromolar canal distal to the impaction. Communication with the dentist responsible for each case was done to determine whether these findings were detected or undetected by them before communication. Results Statistically significant correlations were found between impaction position, distal bone loss, and detected distal caries associated with the adjacent second molar. The greatest percentage of undetected findings was found in the evaluation of distal bone status, followed by missed detection of the retromolar canal. Conclusion The radiographic assessment protocol for impacted third molars should consider a step-by-step evaluation for second molars, and clinicians should be aware of the high prevalence of second molar affection in horizontal and mesioangular impactions. They also should search for the retromolar canal due to its associated clinical considerations.

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