NEET MDS Lessons
Radiology
Age Groups and Radiographs
-
Age 2:
- Anterior IOPA's: 2
- Posterior IOPA's: 4
- Bitewings: 2
- Total Films: 12
-
Age 8:
- Anterior IOPA's: 8
- Posterior IOPA's: 4
- Bitewings: 2
- Total Films: 14
-
Age 8 (another entry):
- Anterior IOPA's: 8
- Posterior IOPA's: 8
- Bitewings: 2
- Total Films: 20
Summary of Total Films by Type
-
Anterior IOPA's:
- Age 2: 2
- Age 8: 8
- Age 8 (another entry): 8
- Total Anterior IOPA's: 18
-
Posterior IOPA's:
- Age 2: 4
- Age 8: 4
- Age 8 (another entry): 8
- Total Posterior IOPA's: 16
-
Bitewings:
- Age 2: 2
- Age 8: 2
- Age 8 (another entry): 2
- Total Bitewings: 6
Overall Total Films
- Total Films for Age 2: 12
- Total Films for Age 8 (first entry): 14
- Total Films for Age 8 (second entry): 20
- Grand Total Films: 12 + 14 + 20 = 46
Radiographic films used in Dentistry
1. Intraoral Periapical (IOPA) Film
- Size 0:
- Dimensions: 22 x 35 mm
- For: Small children
- MPD (Maximum Permissible Dose) for whole body: 0.1 Rem in 1 year
- Size 1:
- MPD for gonads/bone marrow: 0.5 Rem in 1 year
- Size 2:
- Dimensions: 24 x 40 mm or 32 x 41 mm
- For: Anterior projections and adults
- MPD for gestation period in relation to the fetus: 5 Rem
- MPD for skin: 0.5 Rem in 1 year
- Radiation Exposure:
- Mean exposure from one IOPA: 300 mR
- Mean exposure from improved dental X-ray techniques: as low as 110 mR
2. Bitewing Film
- Size 0:
- For: Very small children
- Size 1:
- For: Children
- Size 2:
- For: Adults
3. Occlusal Film
- Size:
- 3 times larger than size 2 film (57 x 76 mm)
- Used for capturing larger areas of the dental arch.
4. Screen Film
- Size:
- 8 x 10 inches
- Used for extraoral projections in conjunction with an intensifying screen.
Additional Information
- Erythema Dose: The amount of radiation necessary to produce a noticeable skin reaction, typically 300-400 R.
- ALARA Principle: Stands for "As Low As Reasonably Achievable," emphasizing the importance of minimizing radiation exposure.