Dentofacial Orthopedics Glossary
105 terms total — 24 showing — Last updated 15 Sep 2026
Functional Matrix Theory
A developmental theory proposing that the growth of skeletal structures is driven by the functional demands of the soft-tissue matrices they support or protect.
Le Fort I Osteotomy
A surgical procedure in which the maxilla is separated from the skull base at a horizontal plane above the tooth roots a...
Lip Bumper
A removable intraoral arch wire device that holds the lips and cheeks away from the teeth to reduce the muscular pressur...
Lip Competence
The ability to achieve an anterior oral seal with the lips in a relaxed, natural posture, without muscular strain.
Malocclusion
Any deviation from the ideal alignment and occlusal relationship of the upper and lower teeth, classified by Angle's cla...
Mandibular Plane Angle
A cephalometric measurement of the steepness of the lower jaw's inferior border relative to a cranial base reference pla...
Mandibular Symphysis
The midline fibrocartilaginous junction of the two halves of the mandible that fuses during early childhood, forming the...
Maxillary Deficiency
A skeletal condition in which the maxilla is underdeveloped or posteriorly positioned relative to the cranial base, typi...
Maxillary Excess
A skeletal condition in which the maxilla is positioned or developed beyond normal limits in the sagittal, vertical, or...
Menton
The most inferior point on the mandibular symphysis in the midsagittal plane, used as a landmark in cephalometric and fa...
Mesialization
The orthodontic movement of a tooth or teeth in a mesial (anterior) direction along the dental arch.
Midpalatal Suture
The fibrous joint that unites the two palatal bones at the midline of the hard palate, targeted during palatal expansion...
Nance Holding Arch
A fixed space-maintenance appliance consisting of bands on the upper first molars connected by a wire that rests against...
Nasion
The most anterior point of the nasofrontal suture, used as a landmark in cephalometric tracing.
Nasolabial Angle
The angle formed at the junction of the columella of the nose and the upper lip, used to assess soft-tissue harmony in p...
Open Bite
A malocclusion characterised by a lack of vertical overlap between opposing teeth, most commonly the anterior teeth, res...
OPG
Abbreviation for orthopantomogram; the standard panoramic dental radiograph used in orthodontic record-taking.
Orbitale
The most inferior point on the lower margin of the bony orbit, serving as one of the two reference points defining the F...
Orthognathic Surgery
Surgical repositioning of the maxilla, mandible, or both to correct significant skeletal discrepancies that cannot be ma...
Orthopedic Force
A heavy, intermittent or sustained force applied to the dentofacial skeleton with the intention of modifying bone or sut...
Overbite
The vertical overlap of the upper incisors over the lower incisors when the teeth are in maximum intercuspation.
Overjet
The horizontal distance between the labial surface of the upper incisor and the labial surface of the lower incisor, mea...
Panoramic Radiograph
A single extraoral dental X-ray image that depicts both dental arches, the alveolar bone, and associated craniofacial st...
Peer Assessment Rating
A validated index used to quantify the degree of malocclusion and the outcome of orthodontic treatment by scoring occlus...
Pendulum Appliance
A fixed intraoral device that uses nickel-titanium coil springs anchored to the palate to distalize (move posteriorly) t...