BU DENTAL RADIOLOGY EXAM Question and
Answer 2026 | Complete Certification
Review Guide | Grade A+
• Parallel Technique -✓✓1) Long axis of tooth and film are parallel to eachother
2) The central ray is directed perpendicular to the long axis of the tooth and film
• Periapical Film -✓✓Used to show root apex of tooth and surrounding structures
• Bitewing exposure -✓✓Used to detect interproximal decay and height of alveolar bone
• Occlusial -✓✓Used to view cross section of the teeth and complete palatal structure
or floor of mouth
• 5 safety precautions for operator -✓✓1) Never hold film in patients mouth
2) Stand behind a protective barrier
3) stand 6 feet away from x-ray unit
4)Never stand in direct line of primary beam
5) Use lead lined open cone
• Care of x-ray unit -✓✓1) Don't force unit arm to be extended
2) Don't leave the arm extended after use
3) allow 5 seconds between exposures to let the tube cool
4) Don't let the tube head hit the wall
5) always turn off unit when finished
• Inverse Square Law -✓✓Using a longer target object diminishes intensity of radiation
• Horizontal angulation (Parallel Technique) -✓✓Central ray must pass through the
teeth parallel to the proximal surfaces
• Vertical Angulation (Parallel Technique) -✓✓The film is parallel to the long axis of the
teeth
• Elongation -✓✓Vertical angulation too low
• Foreshortening -✓✓Vertical angulation too high
• Overlapping -✓✓Result of incorrect horizontal angualtion
• Target Film Distance -✓✓16"
Answer 2026 | Complete Certification
Review Guide | Grade A+
• Parallel Technique -✓✓1) Long axis of tooth and film are parallel to eachother
2) The central ray is directed perpendicular to the long axis of the tooth and film
• Periapical Film -✓✓Used to show root apex of tooth and surrounding structures
• Bitewing exposure -✓✓Used to detect interproximal decay and height of alveolar bone
• Occlusial -✓✓Used to view cross section of the teeth and complete palatal structure
or floor of mouth
• 5 safety precautions for operator -✓✓1) Never hold film in patients mouth
2) Stand behind a protective barrier
3) stand 6 feet away from x-ray unit
4)Never stand in direct line of primary beam
5) Use lead lined open cone
• Care of x-ray unit -✓✓1) Don't force unit arm to be extended
2) Don't leave the arm extended after use
3) allow 5 seconds between exposures to let the tube cool
4) Don't let the tube head hit the wall
5) always turn off unit when finished
• Inverse Square Law -✓✓Using a longer target object diminishes intensity of radiation
• Horizontal angulation (Parallel Technique) -✓✓Central ray must pass through the
teeth parallel to the proximal surfaces
• Vertical Angulation (Parallel Technique) -✓✓The film is parallel to the long axis of the
teeth
• Elongation -✓✓Vertical angulation too low
• Foreshortening -✓✓Vertical angulation too high
• Overlapping -✓✓Result of incorrect horizontal angualtion
• Target Film Distance -✓✓16"
