Study of the nature and production of x-rays and basic principles and procedures in oral radiology. Emphasis is on radiation physics, radiation biology radiation protection, basic intraoral radiographic techniques, and image processing and mounting procedures. This course will be held as hybrid a synchronic 1:1, one group (A+B) will attend the lecture in-class room physically, while the other group (C+D) will have it as on-line (recorded lecture), and the following week vise versa. Discussion may take place either online or in class room. The lectures will be given using power point presentations, reading assignments, recorded videos.