NORMAL
RADIOGRAPHIC
ANATOMICAL
LANDMARKS
DR. DIVYA RANA
a
b
c
a : enamel
B : dentin
C : pulp
Cervical burnout :
Radiographs sometimes show
Diffuse radiolucent areas
With ill defined borders
Present on mesial n dista...
Lamina dura:
It is a thin radio-opaque Layer Of dense bone surrounding the
Tooth socket.
It is thicker than the surroundin...
Alveolar crest
The gingival margin of the
Alveolar process that extends
Between the teeth is
Apparant on radiographs
As ra...
Periodontal ligament space
PDL space is primarily composed of collagen, so appers as radiolucent
Space between tooth root ...
Cancellous bone : it lies between the cortical plates in both the jaws.
It is composed of thin radiopaque plates and rods ...
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Landmarks of maxilla
median palatine suture
Nasal fossa
Nasal septum
Anterior nasal spine
Inci...
Maxillary anterior region
Nasal septum
Nasal fossa
Nasal spine
Insicive foramen
Nose
Median palatine suture
A-Nasal septum
B-Nasal fossa
C-Anterior nasal spine
D-Incisive foramen
E-Median palatine suture
a
b
c d
e
Nasal cavities Nasal
septum
Anterior nasal spine
Median palatine suture
1 .Nasal septum (17): appears as a
radio-opaque line that separates
the two nasal fossa in the
midline.
2. Anterior nasal ...
Palatal view
Median palatine suture
Median palatine suture
Appears as a vertically oriented
Radiolucent line in true image
projections through the midline.
Us...
Palatal view
Incisive foramen
Red arrow points to
periapical lesion
periapical cyst
Red arrow :mesiodens mesiodens
Incisive canal cyst
Facial view
Nasal septum
Facial view
Nasal fossa
Soft tissues of nose
Red arrow : soft tissues of nose
Green arrow :lip line
Floor of nasal fossa
Maxillary sinus
Lateral fossa
Nose
Maxillary canine
a: Floor of nasal fossa
b: Maxillary sinus
c: Lateral fossa
a
b
c
Floor of nasal fossa (red arrow) and anterior border of
maxillary sinus (blue arrows),forming the inverted
(upside down )Y
Lateral fossa : the radiolucency results from a depression
Above and posterior to the lateral incisor.To help rule
Out a p...
The maxillary sinus surrounds
The root of the canine,
Which may be misinterpreted
As pathology.
Black arrows indicate the ...
Sinus
septum
Zygomatic
process
Maxillary sinus
Maxillary premolar region
a: Malar process
c: Sinus septum
d: Maxillary sinus
a
c
d
a c
d
Maxillary sinuszygoma
ptrygoid plate
Hamular process
Coronoid process maxillary tuberosity
Maxillary molar region
Maxillary sinus :
The maxillary sinus with
Its thin bony walls, its
thin mucosa, and its vast
Air space, produce an
Extrem...
1- body of zygoma
6- apices of roots
7 - floor of the sinus
8- septum of the sinus
molar region
In general ,the floor of the sinus is
Approximately coincidental with
The location of the apices of the
Roots of the upper...
In other cases the sinus floor dips so deeply between the roots of the
Maxillary teeth that the latter appear to project i...
Pneumanization :expansion of sinus wall into surrounding
bone, usually in an area where teeth have been lost
prematurely.
...
a
c
d
e
g
e
g
d
c a
b
f
f
A :max tuberosity e : zygoma (dotted lines)
B :coronoid process f : max sinus
C : hamular proces...
Malar (zygomatic) process. U or j- shaped
Radio-opacity, often superimposed over the roots
Of the molars, specially when u...
Maxillary tuberosity : the rounded elevation located at the
posterior aspect of both sides of the maxilla.
Malar bone : or the zygomatic
Process.The inferior portion
Of the malar bone appears
As a radio-opaque, U shaped structure...
Black arrows : hamular process
Purple arrows : pterygoid plates
Coronoid process : it is seen as a radio-opaque structure in
maxillay molar iopa.
Hamular process:
It is a bony spine extending from
Pterygoid process of the sphenoid
Bone. It appears as a radio-opaque
Sp...
The zygomatic process (green) is a U shaped rationality. Normally
the Zygomatic bone posterior to this is very dense and r...
Nasolacrimal duct :
It is seen in occlusal view
of the maxilla as a round
radiolucent area
superimposed on the
posterior r...
Landmarks of mandible
Lingual foramen
Genial tubercles
Mental ridge
Mental foramen
Mental fossa
External oblique line
Inte...
Mandibular symphysis
In a new born infant
Symphysis
Fracture
Mandibular incisor region
mental fossa
Lingual foramenGenial tubercle
Mental ridge
a
b
cd
C :mental ridge
D: mental fossa
A: lingual foramen
b: genial tubercles
Lingual foramen : radiolucent ‘hole ’ in centre of genial tubercles.
Lingual nutrient vessels pass through this foramen .
Lingual foramen
It is set in the midline deep
To the apices of the
Anterior teeth.
It appears as a small
Radiolucent dot a...
Genial tubercles : radio-opaque area in the midline surrounding
The lingual foramen
Genial tubercles:They appear as radio Opaque circle that surrounds
the lingual foramen just below the apices of the Of the...
mental ridge
Mental ridge :
it is a bony prominence found on the labial
Aspect of the mandible near its inferior border and extended
Fr...
mental fossa : this represents the depression on the labial
aspect of the mandible overlying the roots of the incisors.The...
Nutrient canals :
The arrows above identify
nutrient
Canals.
They are most often seen in
Persons with thin bone and in
Tho...
Mental foramen (3)
It appears as a radiolucent,
ill defined area between
the apices of bicuspids.
it represents the anteri...
6- caries
7- prepared cavity
8- enostosis
9 –mental foramen
Mandibular premolar region
A – mylohyoid ridge
B - mandibular canal
c – submandibular gland fossa
d – mental foramen
b -Mandibular canal
d -Mental foramen
a- Mylohyoid ridge
c -Submandibular gland fossa
d
b a
c
mental
foramen
Mandibular molar region
A – external oblique ridge
B – mylohyoid ridge
C – mandibular canal
D- submandibular gland fossa
A -External oblique ridge
c -Mandibular canal
B - Mylohyoid ridge
D -Submandibular gland fossa
a
c
b
d
External oblique ridge - a continuation of the anterior border of ramus
passing downward and forward on the buccal side of...
The external oblique ridge (red) and the mylohyoid ridge (blue)
Usually run parallel to each other , with the external obl...
Internal oblique ridge -
It appears as a radio opaque
Line, descending downwards
And forward from coronoid
Process, in a h...
Mylohyoid ridge (internal oblique) – located on the lingual
Surface of the mandible , extending from third molar area
to P...
Mandibular canal : arises at the mandibular foramen on the
Lingual side of the ramus and passes downward and forward,
Movi...
The mandibular canals (red arrows) usually runs very close to the molars
Green arrow showing dilaceration of roots.
The ot...
Bifid mandibular canal:
a) cone beam section
b) Cross section
Submandibular gland fossa
Submandibular gland fossa -
It is a depression on the lingual
Aspect of the mandible on which
Submandibular glands are
Pre...
A – external oblique ridge
B – mylohyoid ridge
c – mandibular canal
D – submandibular gland fossa
a
b
c
d
THANK YOU
PRESENTED BY: DR. DIVYA RANA
Normal Radiographic Anatomical Landmarks
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Normal Radiographic Anatomical Landmarks

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PRESENTATION OF NORMAL ANATOMICAL LANDMARKS ON INTRA ORAL PERIAPICAL RADIOGRAPHS.

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Transcript of "Normal Radiographic Anatomical Landmarks"

  1. 1. NORMAL RADIOGRAPHIC ANATOMICAL LANDMARKS DR. DIVYA RANA
  2. 2. a b c a : enamel B : dentin C : pulp
  3. 3. Cervical burnout : Radiographs sometimes show Diffuse radiolucent areas With ill defined borders Present on mesial n distal Aspects of teeth in cervical region These regions appear between The edge of the enamel cap And the crest of the alveolar Ridge. It should not be confused with Root caries.
  4. 4. Lamina dura: It is a thin radio-opaque Layer Of dense bone surrounding the Tooth socket. It is thicker than the surroundingTrabecular bone and thickness Increases with increase in amount In the occlusal stress
  5. 5. Alveolar crest The gingival margin of the Alveolar process that extends Between the teeth is Apparant on radiographs As radiopaque line called Alveolar crest. It is considered as normal If it is not > than 1.5 mm From cej of adjacent teeth.
  6. 6. Periodontal ligament space PDL space is primarily composed of collagen, so appers as radiolucent Space between tooth root and lamina dura.
  7. 7. Cancellous bone : it lies between the cortical plates in both the jaws. It is composed of thin radiopaque plates and rods surronding many Small radiolucent marrow spaces.
  8. 8. •Email •Likd × •Save •Embed Landmarks of maxilla median palatine suture Nasal fossa Nasal septum Anterior nasal spine Incisive foramen Lateral fossa Maxillary sinus Malar bone Maxillary tuberosity Hamular process Nasolacrimal duct
  9. 9. Maxillary anterior region Nasal septum Nasal fossa Nasal spine Insicive foramen Nose Median palatine suture
  10. 10. A-Nasal septum B-Nasal fossa C-Anterior nasal spine D-Incisive foramen E-Median palatine suture a b c d e
  11. 11. Nasal cavities Nasal septum Anterior nasal spine Median palatine suture
  12. 12. 1 .Nasal septum (17): appears as a radio-opaque line that separates the two nasal fossa in the midline. 2. Anterior nasal spine (16): appears as aV-shaped radio-opaque structure in the midline above the incisive foramen. 3. Incisive foramen (12): or the anterior palatine fossa, it usually appears as a prominent radiolucent area above or between roots of two central incisors, it usually appears round or oval in shape and doesn’t exceed 6mm in diameter.
  13. 13. Palatal view Median palatine suture
  14. 14. Median palatine suture Appears as a vertically oriented Radiolucent line in true image projections through the midline. Usually prominent between the two central incisor roots in Young individuals.
  15. 15. Palatal view Incisive foramen
  16. 16. Red arrow points to periapical lesion periapical cyst
  17. 17. Red arrow :mesiodens mesiodens
  18. 18. Incisive canal cyst
  19. 19. Facial view Nasal septum
  20. 20. Facial view Nasal fossa
  21. 21. Soft tissues of nose
  22. 22. Red arrow : soft tissues of nose Green arrow :lip line
  23. 23. Floor of nasal fossa Maxillary sinus Lateral fossa Nose Maxillary canine
  24. 24. a: Floor of nasal fossa b: Maxillary sinus c: Lateral fossa a b c
  25. 25. Floor of nasal fossa (red arrow) and anterior border of maxillary sinus (blue arrows),forming the inverted (upside down )Y
  26. 26. Lateral fossa : the radiolucency results from a depression Above and posterior to the lateral incisor.To help rule Out a pathology, look for an intact lamina dura Surrounding the adjacent bone.
  27. 27. The maxillary sinus surrounds The root of the canine, Which may be misinterpreted As pathology. Black arrows indicate the floor of the nasal fossa ,the max sinus (red arrows) has pneumatized bet the 2nd PM And 1st molar.
  28. 28. Sinus septum Zygomatic process Maxillary sinus Maxillary premolar region
  29. 29. a: Malar process c: Sinus septum d: Maxillary sinus a c d a c d
  30. 30. Maxillary sinuszygoma ptrygoid plate Hamular process Coronoid process maxillary tuberosity Maxillary molar region
  31. 31. Maxillary sinus : The maxillary sinus with Its thin bony walls, its thin mucosa, and its vast Air space, produce an Extremely dark image Deep to the maxillary Teeth. Its outlines, particularly its Floor, are clearly delineated By delicate radio-opaque lines
  32. 32. 1- body of zygoma 6- apices of roots 7 - floor of the sinus 8- septum of the sinus molar region
  33. 33. In general ,the floor of the sinus is Approximately coincidental with The location of the apices of the Roots of the upper teeth (bicuspids And first two molars ). But there is often as much as two Or even three mm of maxillary Bone between the root ends and Sinus floor.
  34. 34. In other cases the sinus floor dips so deeply between the roots of the Maxillary teeth that the latter appear to project into it for as much as One half of their length
  35. 35. Pneumanization :expansion of sinus wall into surrounding bone, usually in an area where teeth have been lost prematurely. It increases with age .
  36. 36. a c d e g e g d c a b f f A :max tuberosity e : zygoma (dotted lines) B :coronoid process f : max sinus C : hamular process g :sinus recess D: pterygoid plates Image of the imacted third molar superimposed
  37. 37. Malar (zygomatic) process. U or j- shaped Radio-opacity, often superimposed over the roots Of the molars, specially when using the bisecting Angle technique.The red arrows define the Lower border of the zygomatic bone.
  38. 38. Maxillary tuberosity : the rounded elevation located at the posterior aspect of both sides of the maxilla.
  39. 39. Malar bone : or the zygomatic Process.The inferior portion Of the malar bone appears As a radio-opaque, U shaped structure Related to the roots of the first Maxillary molar. It represents the Attachment of the zygomatic bone To the maxilla. Maxillary tuberosity: appears As a radio-opaque structure that Extends distally and upward from Posterior to maxillary sinus. It Represents the end of maxilla.
  40. 40. Black arrows : hamular process Purple arrows : pterygoid plates
  41. 41. Coronoid process : it is seen as a radio-opaque structure in maxillay molar iopa.
  42. 42. Hamular process: It is a bony spine extending from Pterygoid process of the sphenoid Bone. It appears as a radio-opaque Spine that is recorded on radiographs Distal to the tuberosity of maxilla And extends downward. Coronoid process of the mandible: Appears as a triangular radio- opaque structure projected into the same general area of max periapical film projections distal to the maxillary teeth.
  43. 43. The zygomatic process (green) is a U shaped rationality. Normally the Zygomatic bone posterior to this is very dense and radio- opaque. In this, however the max sinus has expanded into the zygomatic bone and makes the area more radiolucent (red).The coronoid process (orange), the pterygoid plates (blue) and the max tuberosity (pink) are also identified .
  44. 44. Nasolacrimal duct : It is seen in occlusal view of the maxilla as a round radiolucent area superimposed on the posterior region of the hard palate.
  45. 45. Landmarks of mandible Lingual foramen Genial tubercles Mental ridge Mental foramen Mental fossa External oblique line Internal oblique line Mylohyoid line Mandibular foramen Inferior alveolar canal Submandibular gland fossa Nutrient canals
  46. 46. Mandibular symphysis In a new born infant Symphysis Fracture
  47. 47. Mandibular incisor region mental fossa Lingual foramenGenial tubercle Mental ridge
  48. 48. a b cd C :mental ridge D: mental fossa A: lingual foramen b: genial tubercles
  49. 49. Lingual foramen : radiolucent ‘hole ’ in centre of genial tubercles. Lingual nutrient vessels pass through this foramen .
  50. 50. Lingual foramen It is set in the midline deep To the apices of the Anterior teeth. It appears as a small Radiolucent dot at the Symphysis area usually Surrounded by a radio Opaque structure.
  51. 51. Genial tubercles : radio-opaque area in the midline surrounding The lingual foramen
  52. 52. Genial tubercles:They appear as radio Opaque circle that surrounds the lingual foramen just below the apices of the Of the incisors.
  53. 53. mental ridge
  54. 54. Mental ridge : it is a bony prominence found on the labial Aspect of the mandible near its inferior border and extended From the premolar region to the symphysis area on wchich It takes an upward turn as it approaches it. It appears as a Radio opaque line below the apices of anterior teeth.
  55. 55. mental fossa : this represents the depression on the labial aspect of the mandible overlying the roots of the incisors.The resultant radiolucency may be mistaken for pathology
  56. 56. Nutrient canals : The arrows above identify nutrient Canals. They are most often seen in Persons with thin bone and in Those with high blood pressure Or advanced periodontitis. Nutrient canals
  57. 57. Mental foramen (3) It appears as a radiolucent, ill defined area between the apices of bicuspids. it represents the anterior Terminates of the mandibular canal.
  58. 58. 6- caries 7- prepared cavity 8- enostosis 9 –mental foramen
  59. 59. Mandibular premolar region A – mylohyoid ridge B - mandibular canal c – submandibular gland fossa d – mental foramen
  60. 60. b -Mandibular canal d -Mental foramen a- Mylohyoid ridge c -Submandibular gland fossa d b a c
  61. 61. mental foramen
  62. 62. Mandibular molar region A – external oblique ridge B – mylohyoid ridge C – mandibular canal D- submandibular gland fossa
  63. 63. A -External oblique ridge c -Mandibular canal B - Mylohyoid ridge D -Submandibular gland fossa a c b d
  64. 64. External oblique ridge - a continuation of the anterior border of ramus passing downward and forward on the buccal side of the mandible. It apperas as a radio-opaque line which usually ends anteriorly in the Area of the first molar. The red arrow points to the mylohyoid ridge.
  65. 65. The external oblique ridge (red) and the mylohyoid ridge (blue) Usually run parallel to each other , with the external oblique ridge Always being higher on the film .
  66. 66. Internal oblique ridge - It appears as a radio opaque Line, descending downwards And forward from coronoid Process, in a horizontal Position, stop at the third Molar area or become cotinuous With the mylohyoid line Its placed below the external Oblique ridge.
  67. 67. Mylohyoid ridge (internal oblique) – located on the lingual Surface of the mandible , extending from third molar area to Premolar region
  68. 68. Mandibular canal : arises at the mandibular foramen on the Lingual side of the ramus and passes downward and forward, Moving from the lingual side in the third molar region to the buccal Side in the premolar region. It contains the inferior alveolar nerves and vessels.
  69. 69. The mandibular canals (red arrows) usually runs very close to the molars Green arrow showing dilaceration of roots. The other film shows impaction at the superior border of the canal .
  70. 70. Bifid mandibular canal: a) cone beam section b) Cross section
  71. 71. Submandibular gland fossa
  72. 72. Submandibular gland fossa - It is a depression on the lingual Aspect of the mandible on which Submandibular glands are Present. It appears as a zone of Radiolucency below the Lower molars
  73. 73. A – external oblique ridge B – mylohyoid ridge c – mandibular canal D – submandibular gland fossa a b c d
  74. 74. THANK YOU PRESENTED BY: DR. DIVYA RANA
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