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4. Dental photography
• Patient education
• Legal record for facial features before and after
dental treatment
• Excellent tool for teaching
• Excellent tool for communication
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5. Digital photography
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Basics of digital photography
Classification of digital cameras
Features to consider in digital cameras
Conventional versus digital photography
Common errors in clinical photography
Gold standard in clinical photography
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6. B
asics of digital photography
• First used in 1981
• Commercially available since 1991(marketed
by auto trader).
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17. Shutter speed
• Shutter speed – the length of time the shutter
is open and light strikes the image sensor
• Bright lens and high shutter speed – ideal
• Higher shutter speed – grater the image quality
• Cameras should have a range of high and low
shutter speeds.
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28. Zoom
• Must in any digital camera
• Closer to the subject without moving
physically closer.
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29. Focal length
• The distance between the rear nodal point of the lens and
the focal plane when focus is set at infinity.
• Nodal point – where the rays of light appear to have come
after passing through the lens.
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30. • HOW MUCH THE CAMERA SEES ( ANGLE OF
VIEW OF THE LENS).
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33. Optical zoom
• Zoom lens is lens determined so that its focal length
can be varied over a predetermined range.
• The image is optically modified so that it can show a
smaller o larger field of view.
• This allows to replace a no of single focal length
lenses.
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34. • Does not change the resolution of the image or
the image size, the no of pixels used to
describe the image are same.
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39. Dif f erence between optical and
digital zoom
• Optical zoom – bring object closer ( like a
telescope)
• Digital zoom is merely a cropping tool.
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40. Conf usion
• for eg- 10 x optical zoom becomes 60 x if 6x
digital zoom is tacked on the focal length of
the lens.
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111. Alternatives
• Rotating camera through 1800
• Illuminated backdrop screen
• Dark non reflective background preferably
velvet
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145. Standardizing dental photography
• Natural head position.
• Frontal views.
• The line from the outer canthus of eye to
superior attachment of ear from should be
parallel to Frankfort horizontal plane.
• The inter pupilary line should be parallel to
horizontal plane
• The distance from outer canthus of eye to the
hair line should be equal on both side
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147. CAMER LENS AND P
A
OSITION
• Focal length of the lens should be the same
(100 or 105mm)
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148. CAMER LENS AND P
A
OSITION
• Have consistent subject – camera distances
(use of tripod)
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149. CAMER LENS AND P
A
OSITION
• Camera position is one in which a line from
middle of lens to eye is parallel to horizontal
plane
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150. GOLD STANDAR IN
D
P
HOTOGR HY
AP
• Journal of orthodontics june 2002
- j sandler and a murray
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151. • Survey carried out in angle society.
• Seventy questionnaires were used
• Following questions were asked.
– which intraoral and extraoral photographs they currently take?
– when during the treatment the photographs are taken?
– which staff member takes the photographs?
– what medium is used to record the images?
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152. R
outine use of photography
96% take pre and post treatment photographs.
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158. Gold standard
• Nine pretreatment and nine post treatment
photographs are a must.
• mid treatment photographs at change of every
arch wire .
• Up to 36 photographs are considered a
reasonable number for full photographic
documentation of the case.
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159. Need f or photographs
• Extra oral
full face view ( lips at rest )
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160. Need f or photographs
• Extra oral
– full face view ( smiling)
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161. Need f or photographs
• Extra oral
– three quarter view
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162. Need f or photographs
• Extra oral
– profile view
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163. Need f or photographs
• Intra oral
front intra oral view.
buccal intra oral shots.
upper and lower buccal shots.
overjet view ( optional ).
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