From: Quantification of skeletal asymmetries in normal adolescents: cone-beam computed tomography analysis
Landmarks | Definition | Sagittal slice | Axial slice | Coronal slice | ||
---|---|---|---|---|---|---|
Dental | Mx1 | Maxillary central incisors | Incisal contact point of the maxillary central incisors | Inferior-most point | Contact point | Incisal embrasure |
Md1 | Mandibular central incisors | Incisal contact point of the mandibular central incisors | Inferior-most point | Contact point | Incisal embrasure | |
Mx3R and Mx3L | Maxillary canine | Cusp tip of the maxillary canine | Inferior-most point | First point that appears | Inferior-most point | |
Md3R and Mx3L | Mandibular canine | Cusp tip of the mandibular canine | Superior-most point | First point that appears | Superior-most point | |
Mx6R and Mx6L | Maxillary first molar | Mesiobuccal cusp tip of the maxillary first molar | Inferior-most point | First point that appears | Middle-inferior-most point | |
Md6R and Mx6L | Mandibular first molar | Buccal groove of the mandibular first molar | Inferior-most point between the buccal cusps | First point that appears | Superior-most point in line with the buccal cusps | |
Midface | ANS | Anterior nasal spine | The most anterior midpoint of the anterior nasal spine of the maxilla | Lateral-most point | Superior-most point | First point that appears |
PNS | Posterior nasal spine | The most posterior midpoint of the posterior nasal spine of the palatine bone | Lateral-most point | Inferior-most point | First point that appears | |
OrR and OrL | Orbitale | The most inferior point on the infraorbital rim of the maxilla | Inferior-most point of the infraorbital rim | Anterior-most point | Inferior-most point of the infraorbital rim | |
FZSR and FZSL | Frontozygomatic suture | The most superior and medial point on the frontozygomatic suture | Superior-most point | Anterior-most point | Medial-superior most point | |
FPMR and FPML | Frontal process of maxilla | Intersection of the frontal process of the maxilla, frontal bone and lacrimal bone | Superior-most point | Anterior-most point | Medial-superior most point | |
Mandible | Me | Menton | The most inferior midpoint of the chin on the outline of the mandibular symphysis | Inferior-most point | First point that appears | Middle-most point along the inferior border |
Pg | Pogonion | The most anterior midpoint of the chin on the outline of the mandibular symphysis | Inferior-most point | Superior-most point | First point that appears | |
GoR and GoL | Gonion | The midpoint on the angle of the mandible, half way between the corpus and ramus | Middle-most point along the angle of the mandible | Middle-inferior-most point | Middle-inferior-most point | |
CdSR and CdSL | Condyle superior | The most superior point of the condylar head | Superior-most point | First point that appears | Superior-most point | |
CdLR and CdLL | Condyle lateral pole | The most lateral point of the condylar head | First point that appears | Lateral-most point of the widest section of the condyle | Lateral-most point | |
CdMR and CdML | Condyle medial pole | The most medial point of the condylar head | First point that appears | Medial-most point of the widest section of the condyle | Medial-most point | |
CdAR and CdAL | Condyle anterior | The most anterior point of the condylar head | Anterior-most point | Middle-most point on the anterior surface of the widest section of the condyle | Medial-most point | |
CdPR and CdAL | Condyle posterior | The most posterior point of the condylar head | Posterior-most point | Middle-most point on the posterior surface of the widest section of the condyle | N/A | |
Temporal bone | GlSR and GlSL | Glenoid fossa superior | The most superior point of the glenoid fossa of the temporal bone | Superior-most point | First point that appears | Superior-most point |
GlAR and GlAL | Glenoid fossa Anterior | The most inferior point of the articular eminence of the temporal bone | Inferior-most point on the articular eminence | Anterior-most point | Superior-most point | |
PoR and PoL | Porion | The most superior point of the external acoustic meatus | Superior-most point of the external acoustic meatus | First point that appears | Superior-most point of the external acoustic meatus | |
Reference planes | ||||||
Axial plane | A plane that connects the most superior point of the external acoustic meatus with the most inferior point of the infraorbital rim on the right and left sides | |||||
Sagittal plane | A plane constructed using paired midfacial anatomic structures (eg., the orbits, frontal process of the maxilla, frontozygomatic suture) | |||||
Coronal plane | A plane constructed from the transporionic line |