Radiography
Radiography		
• Roentgen tube - x- ray tube:		
		
Cathode - Anode - Tension	Hi	
Catode (heated) - Electrons - go against		
Anode - brake - x ray originates		
Radiography
• Imaging method completing clinical examination of patients
Radiography
Principle:
X- rays going through various materials (tissues) are absorbed - image on the film
(a special suspension AgBr - silver bromide)
Roentgen tube X ray tube
Cathode wolfram
(tungsten) filament inside (heated - brought to white heat)
Focus - made of wolfram ^_
Anode
Extraoral and intraoral radiography
• Extraoral:
The film is placed outside of oral cavity
- OPG (orthopantomography)
- Teleradiography
- Special projections of a skull (posteriorly -anteriorly)
- Half axial
- Side projection (TMJ,mandible)
- CT
Extraoral and intraoral radiography
Intraoral - the film is placed into the oral Cavity - a special x-ray apparatus.
- Teeth
- Alveolar bone
- Periodontal space
- Fillings
- Caries
- Level of endodontic treatment
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Half axial
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Intraoral radiography
Film or sensor placed in oral cavity Special apparatus
- Teeth
- Alveolar bone
- Periodontal space
- Fillings
- Caries
- Impacted teeth
- Level of endodontic treatment
Technique
Film
The axis of t
y^--► The x-ray beam
Angle between the beam and axis of the angle
The long axis of the tooth
The tooth
The angle betwen the long axis of the tootn and the film
Hypometric and hypermetric picture
Hypometric - the picture is smaller Central beam goes perpendiculary on the tooth
Hypermetric picture - the picture is bigger
- central beam goes perpendiculary to the film paprsek jde kolmo na film.
The tubus can have vairous
position
• Apical projection: the central beam goes through the apex area
• Periodontal projection: the central beam goes through the uper third of the root
• Coronal projection: the central beam goes through the crown.
Orthoradial and excentric projektion
• Orthoradial - the central beam goes parallel to interdental septa
• Excentric- the central beam goes from distal or mesial side.
		Bitewing
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		Fiml or sensor is in a special holder, patien bites into Tje central beam goes parallel to interdental septa Crowns of teeth are well seen - good for early diagnosis of dental caries
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