OPG Case 4

Technical Quality and Positioning

  • Joker Smile: Present due to the anchor plane being oriented downwards.
  • Airspace: No airspace visible because the tongue was not positioned on the roof of the mouth.
  • Ghost Images: A ghost image of the hyoid bone is visible on the left hand side of the mandible.

Dental Analysis

  • Tooth Count: All 32 teeth are present.
  • Impacted/Ectopic Teeth:
    • 3, 8 and 4, 8 are vertically impacted and associated with pericoronitis.
  • Dental Anomalies:
    • 3, 3 is rotated and infra-occluded.
    • 4, 4 and 1, 8 show buccal rotation.
  • Dental Pathology:
    • 3, 7 has a restoration extending into the pulp floor.
    • No bone loss is noted.
  • Occlusion: Occlusal asymmetry is present, with an asymmetrical deviation of mandibular teeth on the right hand side.

Bony Structures and Pathology

  • General: No abnormal radiolucencies, radio-opacities, or fractures are present. The trabecular pattern is unaltered.
  • Maxillary Sinus: Bilateral sinuses are in close proximity to the maxillary molars.
  • Zygomatic Arch: The zygomaticotemporal suture is visible bilaterally; it is a normal anatomical feature and not a fracture, though it appears distinct in this patient.

Mandibular Asymmetry and TMD

  • Morphology:
    • Left Side: The mandible is larger. The angle is very obtuse and rounded, with a loss of the antigonial notch (a normal anatomical feature). This is suggestive of left hemi-mandibular hyperplasia.
    • Right Side: The mandible is smaller. The condyle is small and tilted backwards rather than flattened. This is suggestive of right condylar hypoplasia.
  • Condylar Comparison: The left condyle appears normal and rounded at the superior point. The right condyle is smaller and tilted.
  • Symmetry: The left side is more rounded, while the right side is flattened on the condylar range and shorter than the left.

Diagnosis and Management

  • Diagnosis: Asymmetric mandible (congenital rather than traumatic) characterized by left hemi-mandibular hyperplasia and right condylar hypoplasia.
  • Referral Path:
    • Orthodontist: Initial referral should be to an orthodontist to assist in diagnosis and planning, as correction involves orthodontic treatment.
    • Maxillofacial Surgeon: For surgical correction of the bony asymmetry (orthognathic surgery).
  • Further Investigations:
    • Cone Beam CT (CBCT) or standard CT scan to better visualize the bony abnormalities and asymmetry.