Table 4 3D measurements used in the study
Measurement | Abb | Definition |
|---|---|---|
Skeletal measurements | ||
Maxillary anteroposterior position | SNA | The angle formed between 3-point landmarks; sella, nasion, and A points |
Mandibular anteroposterior position | SNB | The angle formed between 3-point landmarks; sella, nasion, and B points |
Skeletal anteroposterior jaw relation | ANB | The angle formed between 3-point landmarks; A point, N point, and B point |
Skeletal vertical jaw relation | MP^SN | The angle between sella-nasion (SN) and Go-Me (MP) |
Dental measurements | ||
U6—VP | The distance from upper first molar cusp tip to VP, measuring the amount of first molars distalization |  |
U7—VP | The distance from upper first molar cusp tip to VP, measuring the amount of second molars distalization |  |
L6—VP | The distance from lower first molar cusp tip to VP, measuring the amount of first molars mesialization |  |
L7—VP | The distance from lower first molar cusp tip to VP, measuring the amount of second molars mesialization |  |
Mandibular fossa dimension | ||
Mandibular fossa height | MFH | Distance extends perpendicularly between BMF and TM line |
Mandibular fossa width | MFW | Distance extends horizontally between AF and PF |
Articular eminence height | AEH | The perpendicular distance between AT and MFHP |
Condylar inclination | ||
Mediolateral condylar inclination | MCI | Angle between MCP-LCP line and HP |
Vertical condylar inclination | VCI | Angle between ACP-PCP line and VP plane |
Anteroposterior condylar inclination | APCI | Angle between MCP-LCP line and MSP |
Condylar position | ||
Vertical condylar position | VCP | Distance extends vertically from SCP to HP |
Anteroposterior condylar position | APCP | Distance extends anteroposterior from ACP to VP |
Mediolateral condylar position | MLCP | Distance extends mediolaterally from MCP to MSP |
Vertical condylar joint position | VCJP | Linear difference between condyle height to TM line and condyle height to the condyle neckline |
Condylar dimension | ||
Condylar length | CL | The mediolateral distance from MCP to LCP |
Condylar width | CW | The anteroposterior condylar width CWa to CWp |
Condylar height | CH1 | The perpendicular distance from SCP to CN line (ANP-PNP) |
Condylar height to TM line | CH2 | The perpendicular distance from SCP to TM line |
TMJ spaces | ||
Anterior joint space | AJS | Closest distance between AJSc and AJSf |
Posterior joint space | PJS | Closest distance between PJSc and PJSf |
Superior joint space | SJS | Closest distance between SCP and SMF |
Medial joint space | MJS | Closest distance between MCP and MJSf |
Volumetric total joint space (mm3) | VTJS | Total volumetric mandibular joint spaces (superior, anterior, and posterior) which enclosed by TM line |