occlusion Flashcards
Mesial Step
Mandibular molars more mesial than maxillary molars
- most children
Flush Terminal Plane
Mandibular molars & maxillary molars are even
Distal Step
Mandibular molars more distal than maxillary molars
– least common
What is the relationship between in Centric Relation?
A relationship of the upper jaw to the lower jaws.
What is the relationship between in Centric Occlusion
A relationship of the upper teeth to the lower teeth.
What is Centric Relation (CR)?
The most retruded relationship of the mandible to the maxilla, occurring during strong muscle contractions like swallowing.
What is the ideal relationship between Centric Relation (CR) and Centric Occlusion (CO)?
CR = CO, meaning the mandible and dentition align at “home base.”
What is Centric Occlusion (CO)?
The static position of teeth in opposite arches, also known as habitual, acquired, convenience, intercuspal, or static occlusion.
What is Maximum intercuspation in Centric Occlusion?
maximum closure of the maxillary & mandibular arches
What is Maximum Interdigitation in Centric Occlusion?
Maximum touching of maxillary & mandibular arches
Inter-arch Malocclusions
Midline off center
Inter-arch Malocclusions: Posterior crossbite
- Mandibular arch is facial or lingual to maxillary arch
- Unilateral or bilateral
- Incorrect horizontal overlap
Inter-arch Malocclusions: Anterior crossbite
- Max incisors lingual to mand incisors
- Incorrect horizontal overlap
- Edge to edge
Inter-arch Malocclusions: Edge to edge
anterior teeth
Inter-arch Malocclusions: end to end
posterior teeth
Inter-arch Malocclusions: Open bite
- Anterior or posterior
- Bilateral or unilateral
- Most frequently – anterior
Intra-arch Malocclusions: Supraversion
Above occlusal plane
Intra-arch Malocclusions: Infraversion
Below occlusal plane
Intra-arch Malocclusions: Drifted mesial
Tooth was extracted
Intra-arch Malocclusions: Linguoversion
Tooth positioned more lingual
Intra-arch Malocclusions: Torsoversion
Rotated or twisted
Rotated mesial
Rotated distal
What is the facial profile of Class I malocclusion?
Mesognathic profile
What is the molar relationship of Class I malocclusion?
MB cusp of max 1st molar – buccal groove of mand 1st molar
What is the canine relationship of Class I malocclusion?
Max canine lies between mand canine & mand 1st premolar
Conditions that occur in Class I malocclusion?
- Malposition – individual teeth or groups of teeth
- Crowded anterior teeth
Protruded or retruded max incisors - Anterior crossbite
- Posterior crossbite
- Mesial drift
What is the molar relationship of Class II malocclusion?
Buccal groove of mand 1st molar – distal to MB cusp of max 1st molar
What is the canine relationship of Class II malocclusion?
Distal of mand canine distal to mesial surface of max canine (mand canine is further back than before)
What is the facial profile of Class II malocclusion division 1 and 2?
Retrognathic profile
Conditions that occur in Class II, division 1?
- Mandible retruded, max incisors protruded
- Deep overbite
- Excessive overjet
- Abnormal muscle function
- Short mandible
- Short upper lip
Conditions that occur in Class II, division 2?
- Mandible retruded, one or more max incisors retruded
- Max laterals protrude, max centrals retrude
- Crowded max anterior teeth
Deep overbite
What is the facial profile of Class III malocclusion?
Prognathic profile
What is the molar relationship of Class III malocclusion?
Buccal groove of mand 1st molar – mesial to MB cusp of max 1st molar
What is the canine relationship of Class III malocclusion?
Distal of mand canine mesial to mesial of max canine
Conditions that occur in Class III
- Anterior crossbite
- Max & mand incisors edge-to-edge occlusion
- Crowded mand incisors
What is Overjet?
Horizontal overlap
- Maxilla overlap Mandible
- Whole arch
What is Overbite
Vertical overlap
- Overlap of anterior teeth
