Dental photography we must distinguish two groups, the one that is realized in clinic and the one that is realized in laboratory. Nowadays, it is increasingly taking on the role of the laboratory, because with this we can teach the finished works with a multitude of effects and different cancellations, which make our cases much more striking.
Extraoral photographs: they are the frames in which the patient's full face. Your goal is to capture the facial features and features along with the patient's smile. Thanks to these photographs, we can evaluate the facial change together once the treatment is finished. These photographs are widely used in Orthodontics, where significant facial changes are occasionally produced, although nowadays it is increasingly used in cases of complete rehabilitation and implantology.
Intraoral photography: in these photographs should only leave the mouth without showing the lips, for this we need the lip retractors. They are the photographs that are used to record the time of beginning treatment, the intermediate steps and the end, thus obtaining a complete follow up of the case. These photographs are used in all the specialties of Dentistry because of their great value and importance in showing the treatments to both patients and partners.
Before beginning the technique, we must know several terms necessary for the correct management of a reflex camera:
Depth of Field: Depth of field is the space ahead and behind the focused plane, between the first and last sharply defined point reproduced in the same plane of focus.
Shutter Speed: This is the time the picture is taken.
ISO: is the sensitivity of the camera pickup. In digital cameras is variable but in analog cameras depends on the reel.
Once these terms are learned, we will explain the technique for each type of clinical dental photography.
This photograph serves to capture the facial features of the patients and their future variations once the treatments are finished.
We will need to place the patient at the corresponding height, we can use a stool of variable height.
To carry out these photographs we must have a color background that contrasts with the rest (green, blue). In order to obtain a digital background with pure color (black and white), we will explain this in the Photoshop section. It can also be done by placing a white background and a flash reflecting on it thus eliminating the shadows (method used in the photos of study card type), but this way we will need more equipment and more expense.
Aperture of the diaphragm: it must be at a point that we get adequate illumination, sharpness and depth of field. For this we must choose a medium aperture (f / 22 aprox.), If we do not get enough illumination we can open the diaphragm more, that is, decrease the number f (f / 16).
Shutter Speed: must be sufficient speed to achieve a clear image, thus eliminating the impurities produced in the image by the involuntary movements of the camera or the patient. A correct speed will be (1 / 125s aprox.) Although this also depends on the camera.
ISO: a low sensitivity (200 or as low as possible) should be used to achieve maximum sharpness and minimum granulation possible in photography. If we lack brightness and the photographs go dark, we can increase the sensitivity (500) but increase the grain of the image.
Flash: Must be used in TTL mode, although not all cameras and flashes support it. If this is not possible, it will be used in manual mode, setting the flash correctly to avoid overexposed areas in the image.
A series of full-face photographs should be taken, where the patient is in a resting position, with teeth in occlusion and one with the patient smiling.