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Mandible Fracture (AO CMF)

Mandible Fracture (AO CMF)

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Updated: 
March 3, 2024
(a) Panoramic view of the mandible with a full set of permanent teeth. The mandible is divided into nine topographical regions with the symphysis (S) in the anterior central position. All other regions, including the body (B), angle/ramus (A), coronoid (C), and condylar process (P) are symmetric. Two pairs of transitional zones are assembled between the S and B (1 = anterior transition zone) and between the B and A (2 = posterior transition zone). (b) Three reference lines are oriented perpendicular to the posterior ramus to define condylar process subregions. The condylar head reference line is a tangent line caudal to a sphere around the lateral pole zone and separates the condylar head (CH) from the condylar neck (CN). The sigmoid notch line runs through the deepest point of the sigmoid notch and separates the condylar neck (CN) from the condylar base (CB). The masseteric notch line is located one-third of the distance from the most prominent point of the posterior border of masseteric tuberosity to the sigmoid notch line and this line defines the inferior extent of the condylar base. (c) Fractures of the condylar head are defined based on whether the fracture line courses within the pole (p-fracture) or medial to the pole (m-fracture). A combination of fractures that includes a pole fracture and fracture medial to the pole are described as a p-fracture with fragmentation.
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