Two types of x-rays are used in dentistry
- Intraoral – IOPA, RVG
- extraoral – OPG, CBCT
RVG means Radio Visio Grapghy. It is an instant method of taking dental x-rays. It is a form of intraoral digital imaging which uses advanced sensors instead of traditional films. The image captures better details and also gives lesser radiation as compared to traditional image techniques. There is around 80% reduction in dosage as compared with conventional x-rays. It provides quick results and aids in early diagnosis without wasting patients time.
It is localized and limited to one or 3 to 4 teeth. It can be used as a chairside tool during treatment. In periodontal diseases, it helps to evaluate the alveolar bone loss. RVG is used to educate and motivate the patient. RVG takes localised area images, hence multiple dental implant x-rays are not possible and also as it causes contamination of the surgical area. Multiple RVGs cause patient’s discomfort and it is time consuming where one-day dental implants are choice of treatment. An effective dose is 1-8 micro SV
ortho Panto Gram is done for upper and lower teeth with jawbones and maxillary, nasal sinus. Generally recommended for full mouth cases. OPG is commonly used to diagnose teeth impaction, fractures, dislocation, infection, tumours, sinuses. Recommended in patients with severe gag during placement of RVG sensor. It can be used for diagnostic purpose. For dental implant planning, OPG is advisable compared to RVG as the entire bone structure, nerve pathway can be assessed and implant placements can be done accordingly. Effective doses are 4-30 micro SV.