Intraoral Radiographic Anatomy Unit 2

Radiographic Density Radiopacity – light on film Radiolucency - dark on film Page 24 of Dr. Beck’s Note

Radiopaque vs. Radiolucent Radiopaque:refers to a light area on the film –Structures that are absorbers of x-rays block the x-rays from reaching the film –The x-rays are attenuated (decreased in intensity) by absorbing structures –Fewer photons reach the emulsion –Dense structures are strong absorbers

Radiopaque vs. Radiolucent Radiolucent:refers to a dark area on the film –Structures that are less dense are poor absorbers and allow more photons to reach the film emulsion

Radiopaque vs. Radiolucent Enamel Cementum Dentin Bone Muscle Fat Air Restorative and surgical materials have various densities and abilities to absorb. Metallic materials are more dense than enamel, thus appear very white on radiographs

NIH

Follicle

Trabecular Pattern

Sparse Trabeculation Inferiorly

Dental Papilla

Mandibular Posterior Region

Alveolar Ridge

External Oblique Ridge

Mylohyoid Ridge

Mandibular Canal

Enlarged PDL Space?

Inferior Border of Mandible

Inf. Alveolar Canal

Oblique Ridges

Mental Foramen

Anterior Looping of the Canal

Quiz 2. Normal or abnormal?

Posteriorly Positioned Foramen

Anterior looping of the canal

Mandibular Tori

Anterior Mandible

Genial Tubercle

Nutrient Canals

Mental Fossa Radiolucent depression between alveolar ridge and mental ridge

Mental Ridge

Maxillar

Mandible

All Those Horizontal Lines!

Alveolar Ridge

Floor / Wall of Maxillary Sinus

Zygomatic Arch (Inf. Border)

Zygomatic Process of Maxilla

Floor/wall of Nasal Cavity

Tuberosity

Hamular Notch

Coronoid Process

Resorption of Coronoid Process?

Clinical Hamular Notch

Tuberosity

Maxillary Sinus Floor of sinus extends to alveolar crest due to missing teeth

Floor / Wall of Maxillary Sinus Wavy outline of the sinus

Relatively smooth outline

Nasolabial Fold/ Cheek Mass

Maxillary Anterior Region

Anterior Nasal Spine Radiopaque V-shaped

Floor of Nasal Cavity Extends bilaterally away from ANS

Incisive Foramen Variable size and shape, border Variable position, due to angulation of x-ray beam

Nasopalatine Canal Transmits nasopalatine nerves and vessels Terminates in incisive foramen Not always seen

Sup. Foramina of Nasopalatine On each side of nasal septum Mostly seen when  vertical angle

Nasal Septum Superimposition of septal cartilage and vomer Deviated septum

Inferior Concha In the nasal fossa Away from the septum

Nasal Mucosa

Intermaxillary Suture Median suture Extends from alveolar crest through ANS, posteriorly to distal aspect of hard palate Uniform width Variable shape –Angulation of central ray

Soft Tissue Outline of Nose

Nasal turbinates

Inverted Y-Line

Foramena of Stenson and Scarpa

Orbital Entrance of Naso-lachrymal Canal