Radiology Exam 2

What does it mean if a Cyst is Corticated, Smooth?

Slow growing

What does it mean if a cyst is Circular to Oval?

Hydrostatic Pressure

What does it mean if a cyst is Lucent?

Loss of bone

What kind of Cyst is Inflammatory and associated with a Non-Vital Pulp?

Radicular Cyst

Describe this Radicular Cyst

• Epicenter at apex (usually evidence of dental disease or trauma)

• Well-defined, corticated

• Lucent

• Circular

• Resorption, Displacement, Expansion (effect on adjacent structures)

Why is this Radicular cyst less circular/oval in this case?

What other dental anomaly has Similar Radiographic Features compared to Radicular Cysts?

Osteitis

What is the Green Dot?

Submandibular Fossa

What is the Purple Dot?

Radicular Cyst

What is the dental anomaly?

Radicular Cyst

What is the dental anomaly?

Healing Cyst

What are the Radiographic Characteristics of this Healing Cyst?

New bone forms at the original cortex and grows toward the center

This is an image of PDL widened and actual PDL widened, are both these statements true? or only one?

• Normal Anatomy

  • Mylohyoid Ridge

  • SubMn Fossa

What kind of cyst develops after incomplete removal of a cyst?

Residual Cyst

What are some common radiographic features of a Cyst?

• Circular to oval

• Lucent

• Well-defined

• Corticated

• Resorption, Displacement, Expansion (effects on adjacent structures)

• Odontogenic cysts in tooth-bearing areas

Describe this Residual Cyst

• Extraction site at periapical level

• Above IAN Canal

• Lucent

• Circular, oval

• Defined

• Corticated unless infected

• Displacement, Resorption (effect on adjacent structures)

What is this dental anomaly?

Residual Cyst

What is this dental anomaly?

Residual Cyst

What cyst is Always associated with crown of impacted or unerupted tooth, and developmental and not inflammatory?

Dentigerous Cyst

What are some common radiographic features of Dentigerous Cysts?

• Cortex attached at CEJ

• Unerupted Tooth

• Dentigerous Cyst >= 5mm

Describe this Follicular space

Normal Follicle

Describe what to notice about this Dentigerous Cyst

• Size of Follicular space

• Location of Cortex relative to CEJ

• Resorbed root 18

• Impacted Tooth

Describe what to notice about this Dentigerous Cyst

• Size of Follicular Space

• Location of Cortex Relative to CEJ

• Displaced 32

• Impacted Tooth

Assess the apical lucency at mesial root of 31

Normal Anatomy

Assess #32

Dentigerous Cyst

What should you do with a Dentigerous Cyst?

Biopsy Cyst Wall

What cyst does the tooth remain vital and developmental not inflammatory?

Lateral Periodontal Cyst

What are some common radiographic features of Lateral Periodontal Cyst?

• Side of root, not apical

• 2nd premolar to lateral incisor

What is this dental anomaly?

Lateral Periodontal Cyst

What is this dental anomaly?

Lateral Periodontal Cyst

What is this dental anomaly?

Lateral Periodontal Cyst

Evaluate #30

• Widened PDL

• Pulpal Disease

Evaluate #31

• Normal PDL

• Superimposed Anatomy

Notice other radiographic Features?

What cyst has a tooth that remains vital, root displaced lingually, and lingual cusps appear higher than buccal cusps and PAs and BWs?

Buccal Bifurcation Cyst

Describe the radiographic features of this Buccal Bifurcation Cyst?

• Buccal Bifurcation of Molars

• Roots Displaced Lingually

• Occlusal Plane Inclined Buccally

• Lingual Cusp Higher on BWs and PAs