Download KEY TERMS

10/22/2012
KEY TERMS
 Angle’s Classification
 Cross bite
 Over bite
 Over jet
 Centric Occlusion
 Centric Relation
 Lateral Excursion
 Cuspid or Canine Rise
 Group Function
Group Function
 Leeway Space
 Primate Space
 Curve of Spee
 Curve of Wilson
 Sphere of Monson
 Flush Plane
 Mesial Step
 Distal Step
Class I Malocclusion
A malocclusion with the proper molar relationship and teeth that are crowded together, spaced apart, an overbite, an openbite, a posterior crossbite or an anterior crossbite
Class I – normal occlusion
Class I malocclusion
Class II Malocclusion
A malocclusion with the upper front teeth protruding or due to the lower teeth and/or jaw positioned back relative to the upper teeth and/or jaw.
Class II division 1
Class II division 2 Malocclusion
The 1st molar distal step is the same as Class II division 1. But the anterior teeth do not protrude. Rather, they may appear to be ducked back & typically crowd out the laterals or the cuspids.
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Class II division 2
Treatment Complete: Class II division 2 Class III Malocclusion
A malocclusion with the lower front teeth protruding or due to the lower teeth and/or jaw positioned ahead relative to the upper teeth and/or jaw.
Various Clinical Presentations of:
Class III malocclusion
Space Maintainer – Leeway Space
Complete Class III
Posterior Crossbite
Anterior Crossbite
Protrusion
Ectopic Eruption
Oral Habits
Diastema
Crowding
Open Bite
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Anterior Appliances
Orthodontic Key Terms
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arch wires
mixed dentition
Elastics
Hawley retainer
Classification of Malocclusion (including primary dentition)
Interceptive/preventive orthodontics
orthodontic "records"
separators
lingual bonded retainer
cephalmetric radiograph
palatal separating appliance
Invisalign
ankylosis
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Prognathic
squeeze release technique
Retrognathic
space maintainer
Profiles‐ including mesognathic, prognathic, & t
thi
retrognathic
functional appliance
fixed appliance
direct bonding
indirect bonding residual resin elastic chains
Headgear
thumb sucking appliance
Muscles of Mastication
 Innervated by mandibular branch of trigeminal nerve
 4 pairs ‐ Medial, lateral pterygoid, masseter, temporal
 Masseter, medial pterygoid elevate mandible
Temporal elevates and retrudes mandible
Lateral pterygoid protrudes both the mandible and articular disc and causes lateral excursions, depresses mandible slightly
Temperomandibular Joint ‐
Joint ‐ TMJ
 articular eminence
 synovial fluid
 mandibular elevation  articular fossa
 joint capsule
 lateral deviation
 articular disc
 posterior tubercle
 condyle
 protrusion
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 meniscus
 retraction
 subluxation
 external auditory meatus
 sphenomandibular ligament
 bruxism
 stylomandibular ligament
 TMD
 temperomandibular joint ligament
 equilibration  mastoid process
Muscles of Mastication
Masseter m. elevates mandible
Origin – zygomatic arch, Insertion ‐ lower border
of the mandible
Temporal M. retrudes and
elevates mandible
Origin – temporal fossa
Insertion – coronoid process
Temporal M. passes medial to the zygomatic arch
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Lateral pterygoid
Lateral pterygoid
• Lateral pterygoid has two heads, inferior and superior
• Inferior head goes Inferior head goes
from pterygoid plate to head of condyle
• When inferior head contracts, it pulls condyle forward and depresses it slightly
(inferior head)
When only one lateral pterygoid contracts, the mandible moves to the side
(lateral excursion)
Which lateral pterygoid contracted?
Lateral pterygoid
Lateral pterygoid
(inferior head)
(superior head)
Articular disc is a fibrous pad that acts as a cushion
for TMJ
When both lateral pterygoids contact, the mandible moves forward (protrusion)
Superior head inserts into articular disc
Inferior head
When the mouth is opened wide, the condyle
moves forward, the superior head pulls articular disc forward
to protect joint
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