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Head & Neck Anatomy

Chapter 20 Occlusion

What is occlusion? The contact relationship between the maxillary and mandibular teeth when the jaw is in a closed position.
What is centric occlusion? voluntary position of the dentition that allows the maximum contact when the teeth occlude.
What happens if a tooth is missing for a long period of time? Mesial Drifting or supereruption
Overjet How many mm the maxillary arch naturally overhangs the mandibular, facially.
What is the purpose of overjet? Allows for the extensions of movement in the mandible and keeps soft tissue out of the way during mastication.
What is overbite? in centric occlusion, max. incisors overlap the mandibular incisors.
What is the purpose of overbite? Allows for contact between posterior teeth during mastication.
What teeth are anchor support for the dental arches? Canines & 1st Molars
Phase I of arch form? Molars
Phase II of arch form? Anteriors
Phase III arch form? Premolars
Phase IV arch form? Canines then 2nd molars
Phase V arch form? Wisdom Teeth
What is the Curve of Spee? Anterior to posterior
What is the Curve of Wilson? Side to side.
What is the root axis line? Each tooth is bisected by its root axis line, showing the angulations of the root.
What are centric stops? maximum interdigitation with locking of the two arch positions.
Centric stops include? Height of cusp contour, marginal ridges, central fossae, supporting cusps.
What are supporting cusps? Lingual cusps of max. post & buccal cusps of mand. post./ Incisal edges of mand. anterior
What is centric relation? End point of closure of the mandible: the mand. is in the most retruded position to which it can be carried by the musculature and ligaments.
What percentage of youth show some degree of malocclusion? 80%
What is occlusion? The contact relationship between the maxillary and mandibular teeth when the jaw is in a closed position.
What is centric occlusion? voluntary position of the dentition that allows the maximum contact when the teeth occlude.
What happens if a tooth is missing for a long period of time? Mesial Drifting or supereruption
Overjet How many mm the maxillary arch naturally overhangs the mandibular, facially.
What is the purpose of overjet? Allows for the extensions of movement in the mandible and keeps soft tissue out of the way during mastication.
What is overbite? in centric occlusion, max. incisors overlap the mandibular incisors.
What is the purpose of overbite? Allows for contact between posterior teeth during mastication.
What teeth are anchor support for the dental arches? Canines & 1st Molars
Phase I of arch form? Molars
Phase II of arch form? Anteriors
Phase III arch form? Premolars
Phase IV arch form? Canines then 2nd molars
Phase V arch form? Wisdom Teeth
What is the Curve of Spee? Anterior to posterior
What is the Curve of Wilson? Side to side.
What is the root axis line? Each tooth is bisected by its root axis line, showing the angulations of the root.
What are centric stops? maximum interdigitation with locking of the two arch positions.
Centric stops include? Height of cusp contour, marginal ridges, central fossae, supporting cusps.
What are supporting cusps? Lingual cusps of max. post & buccal cusps of mand. post./ Incisal edges of mand. anterior
What is centric relation? End point of closure of the mandible: the mand. is in the most retruded position to which it can be carried by the musculature and ligaments.
What percentage of youth show some degree of malocclusion? 80%
What is class I malocclusion? Ideal mesiodistal relationship/ MB of max. first molar occludes with the MB groove the mandibular first molar.
What is the facial profile of a class I Malocclusion? Mesognathic.
What is an open bite? The anterior teeth do not occlude.
What is an end to end bite? The teeth occlude without the maxillary teeth overlapping the mandibular teeth.
What is cross bite? When a mand. tooth or teeth are placed facially to the maxillary teeth.
What is class II malocclusion? The MB cusp of the max. first molar occlude (more than the width of a premolar) mesial to the MB groove of the mand. first molar.
What is class II, division I occlusion? The max. anterior protrude facially from the mand. anterior.
What is a clinical consideration of class II, division I occlusion? Mand. incisors super erupt.
What is the facial profile of a class II, division I occlusion? Retrognathi- overbite
What is the palate shape of a class II, division I occlusion? Narrow and V shaped
What is class II malocclusion, division II occlusion? The max. central incisors are upright or retruded.
What is the facial profile of a class II, division II? Mesognathic with a prominent chin.
What is class III malocclusion? MB cusp of the max first molar occludes distal to the MB groove of the mand. first molar.
What is the facial profile of a class III mandible? Prognathic- underbite
What is clenching? Teeth are in centric occlusion for long period of time.
What is bruxism? Grinding of the teeth. Forceful meshing of teeth that may cause audible noises.
What is attrition? Tooth tissues are worn away.
What is abfraction? Tooth tissue loss caused by tensile and compressive forces.
Created by: Strobelight95