Table 2 Definitions of measurement of the temporomandibular joint parameters

Glenoid fossa volume

The volume of the glenoid fossa above the fossa base plane

Glenoid fossa surface area

The surface area of glenoid fossa above the fossa base plane

Glenoid fossa width

The distance between AT and ENP

Glenoid fossa length

The distance between Gf-ant and POP

Glenoid fossa depth

The perpendicular distance of most superior point of glenoid fossa to fossa base plane

Articular eminence (AE) angle

The angle between the tangent line connecting Gf-Sup and AT, and the FH plane

Glenoid fossa axial angle

The angle between the tangent line connecting ENP and AT, and the coronal reference plane

Condylar volume

The volume of condyle above the fossa base plane

Condylar axial angle

The angle between the tangent line connecting Con-med and Con-lat, and the coronal reference plane

Fossa/condyle volume ratio

The volume of glenoid fossa divided by the volume of the condyle

Anterior joint space

The distance parallel to FH plane between the anterior point of the condyle in the glenoid fossa and the anterior wall of glenoid fossa

Posterior joint space

The distance parallel to FH plane between the posterior point of the condyle in the glenoid fossa and the posterior wall of glenoid fossa

Superior joint space

The distance between the most superior point of the condylar in the glenoid fossa and the superior wall of glenoid fossa

Lateral joint space

The distance between the most medial point of the condylar in the glenoid fossa and the medial wall of glenoid fossa

Medial joint space

The distance between the most medial point of the condylar in the glenoid fossa and the medial wall of glenoid fossa