Chapter 20 Occlusion
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| What is occlusion? | The contact relationship between the maxillary and mandibular teeth when the jaw is in a closed position.
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| What is centric occlusion? | voluntary position of the dentition that allows the maximum contact when the teeth occlude.
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| What happens if a tooth is missing for a long period of time? | Mesial Drifting or supereruption
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| Overjet | How many mm the maxillary arch naturally overhangs the mandibular, facially.
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| 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.
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| What is overbite? | in centric occlusion, max. incisors overlap the mandibular incisors.
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| What is the purpose of overbite? | Allows for contact between posterior teeth during mastication.
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| What teeth are anchor support for the dental arches? | Canines & 1st Molars
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| Phase I of arch form? | Molars
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| Phase II of arch form? | Anteriors
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| Phase III arch form? | Premolars
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| Phase IV arch form? | Canines then 2nd molars
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| Phase V arch form? | Wisdom Teeth
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| What is the Curve of Spee? | Anterior to posterior
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| What is the Curve of Wilson? | Side to side.
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| What is the root axis line? | Each tooth is bisected by its root axis line, showing the angulations of the root.
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| What are centric stops? | maximum interdigitation with locking of the two arch positions.
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| Centric stops include? | Height of cusp contour, marginal ridges, central fossae, supporting cusps.
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| What are supporting cusps? | Lingual cusps of max. post & buccal cusps of mand. post./ Incisal edges of mand. anterior
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| 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.
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| What percentage of youth show some degree of malocclusion? | 80%
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| 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.
🗑
|
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| 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
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| Phase II of arch form? | Anteriors
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| Phase III arch form? | Premolars
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| Phase IV arch form? | Canines then 2nd molars
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| Phase V arch form? | Wisdom Teeth
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| What is the Curve of Spee? | Anterior to posterior
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| What is the Curve of Wilson? | Side to side.
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| What is the root axis line? | Each tooth is bisected by its root axis line, showing the angulations of the root.
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| What are centric stops? | maximum interdigitation with locking of the two arch positions.
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| Centric stops include? | Height of cusp contour, marginal ridges, central fossae, supporting cusps.
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| What are supporting cusps? | Lingual cusps of max. post & buccal cusps of mand. post./ Incisal edges of mand. anterior
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| 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.
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| What percentage of youth show some degree of malocclusion? | 80%
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| What is class I malocclusion? | Ideal mesiodistal relationship/ MB of max. first molar occludes with the MB groove the mandibular first molar.
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| What is the facial profile of a class I Malocclusion? | Mesognathic.
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| What is an open bite? | The anterior teeth do not occlude.
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| What is an end to end bite? | The teeth occlude without the maxillary teeth overlapping the mandibular teeth.
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| What is cross bite? | When a mand. tooth or teeth are placed facially to the maxillary teeth.
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| 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.
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| What is class II, division I occlusion? | The max. anterior protrude facially from the mand. anterior.
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| What is a clinical consideration of class II, division I occlusion? | Mand. incisors super erupt.
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| What is the facial profile of a class II, division I occlusion? | Retrognathi- overbite
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| What is the palate shape of a class II, division I occlusion? | Narrow and V shaped
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| What is class II malocclusion, division II occlusion? | The max. central incisors are upright or retruded.
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| What is the facial profile of a class II, division II? | Mesognathic with a prominent chin.
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| What is class III malocclusion? | MB cusp of the max first molar occludes distal to the MB groove of the mand. first molar.
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| What is the facial profile of a class III mandible? | Prognathic- underbite
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| What is clenching? | Teeth are in centric occlusion for long period of time.
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| What is bruxism? | Grinding of the teeth. Forceful meshing of teeth that may cause audible noises.
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| What is attrition? | Tooth tissues are worn away.
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| What is abfraction? | Tooth tissue loss caused by tensile and compressive forces.
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