Occlusion Glossary Flashcards
anterior guidance
the influence of the contacting surfaces of anterior teeth, limiting mandibular movements
anterior open bite
the lack of anterior tooth contact in any occluding position of the posterior teeth
articular disc
fibrous extension of the capsule that runs back between the two articular surfaces of the TMJ
articulating paper
ink-coated paper strips used to locate and mark occlusal contacts
articulator
a mechanical instrument that represents the TMJ and jaws, to which maxillary and mandibular casts may be attached to stimulate some or all mandibular movements
bennet angle
the angle formed between the sagittal plane and the average path of the advancing nonworking-side condyle as viewed in the horizontal plane during lateral mandibular movements
bruxism
parafunctional grinding of teeth
an oral habit consisting of involuntary rhythmic or spasmodic nonfunctional gnashing or clenching of teeth in other than chewing movements of the mandible which may lead to occlusal trauma
centric occlusion
the occlusion of opposing teeth when the mandible is in the centric relation; this may or may not coincide with the maximal intercuspal position
central relation
a maxillomandibular relationship, independent of tooth contact in which the condyles articulate in the anterior-superior position against the posterior slopes of the articular eminences
centric slide
the movement of the mandible while in centric relation, from the intial occlusal contact into maximal intercuspal position
centric stop
opposing cuspal/fossae contacts that maintain the occlusal vertical dimension between teh opposing arches
cusp height
the perpendicular distance the tip of the cusp and its base plane
cuspless teeth
teeth designed without cusp height
deep bite
excessive vertical overlap
digastric
one of two suprahyoid muscles that depress the mandible and elevate the hyoid
disclusion
the separation of opposing teeth during eccentric movements of the mandible
eccentric occlusion
an occlusion other than maximal intercuspal position
edge to edge
articulation in which the opposing anterior teeth meet along their incisal edge when the teeth are in maximal intercuspal position
facebow
instrument used to record the spatial relationship of the maxillary arch to some anatomic reference point(s) and the transfer this relationship to an articulator
it orientates the dental cast in the same relationship to the opening axis of the articulator;
customarily the anatomic references are the mandibular transverse horizontal axis and one other selected anterior reference point
fork
the component of the facebow used to attach the occlusion rim and/or natural teeth to the facebow
fremitus
palpable or visible movement of a tooth when subjected to occlusal forces
geniohyoid
one of the two suprahyoid muscles that depress the mandible and elevate the hyoid bone
gnathology
general term for the study of biology of the masticatory mechanisms and the kinematic recording of the mandibular position
(Stallard-Mccollom and Pankey Mann Schyuyler studied this)
hinge movement
rotation around a transverse axis of the condylar poles
infraocclusion
malocclusion in which the occluding surfaces of teth are below the normal plane of the occlusion and lacking occlusal contact
intercuspal position
the complete intercuspation of the opposing teeth independent of condylar position,
sometimes referred to as the best fit of the teeth regardless of the condylar position
lateral pterygoid
muscles that can depress the mandible (open)
unilateral action protrudes a side to side or lateral movement of the jaw
malocclusion
any deviation from normal occlusion
masseter
muscle that elevates the mandible
medial pterygoid
muscle that elevates the mandible, and involved in some lateral movement
mutually protected occlusion
the anterior teeth disengage the posterior teeth in all mandibular excursive movements
occlusal analysis
a systematic examination of the occlusion with special consideration to the interocclusal relations of mounted casts
occlusal harmony
a condition in maximal intercuspation position and eccentric jaw relation in which there are no interceptive or deflective contacts of occluding surfaces
occlusal interference
any undesirable occlusal contact
posselts envelop
the 3D space circumscribe by mandibular border movements within which all mandibular movement occurs (horizontal, frontal, sagittal)
posterior open bite
lack of posterior tooth contact in any occluding position of anterior teeth
retrodiscal tissue
posterior portion of the articular disc of the TMJ that is vascular and highly innervated and is a major contributor in pain in TMD
retruded contact
contact of a tooth along the retruded path of closure
initial contact of tooth or teeth during closure around a transverse horizontal axis
stylohyoid
suprahyoid muscle that initiates swallowing by pulling the hyoid bone posterior superior
supraocclusion
malocclusion in which the occluding surfaces if teeth extend beyond the normal occlusal plane
temporomandibular joint
joint between the condylar head of the mandible and the mandibular fossa of the temporal bone
terminal hinge axis
an imaginary line around which the mandible may rotate within a sagittal plane
trigeminal
the manidibular branch of this nerve innervates the muscles of mastication
