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Module 16: Mixed Dentition and Occlusion (mixed dentition: combination of…
Module 16: Mixed Dentition and Occlusion
mixed dentition
: combination of some primary teeth and some permanent teeth
Age 5 years
primary teeth erupt between 2 1/2 to 5 1/2 years old. No permanent teeth visible. Primary incisors, canines, and molars present
Age 7 to 8 years
permanent incisors replace primary incisors
Age 6 to 7 years
permanent first molars erupt
Age 10 to 12
all four mandibular premolars erupt replacing mandibular primary first molars and canines; maxillary permanent first premolars erupt and replace primary first molars
Age 11 to 13
primary canines and primary second molars are lost. All permanent detition
Class I
Canine relation: maxillary permanent canine occludes with the distal half of the mandibular canine and the mesial half of the mandibular permanent premolar
Molar relation: buccal groove of mandibular first molar is directly in line with the mesiobuccal cusp of maxillary first molar
Class II, Division I
Molar relation: buccal groove of mandibular first molar is distal to the mesiobuccal cusp of maxillary first molar by at least the width of a premolar
Canine relation: distal surface of the mandibular canine is distal to the mesial surface of the maxillary canine by at least the width of a premolar
All four maxillary incisors protrude
Class II, Division II
Molar relation: buccal groove of mandibular first molar is distal to the mesiobuccal cusp of maxillary first molar by at least the width of a premolar
Canine relation: distal surface of the mandibular canine is distal to the mesial surface of the maxillary canine by at least the width of a premolar
Both maxillary lateral incisors protrude, central incisors retrude
Class III
Molar relation: buccal groove of mandibular first molar is mesial to the mesiobuccal cusp of maxillary first molar by at least the width of a premolar
Canine relation: distal surface of the mandibular canine is mesial to the mesial surface of the maxillary canine by at least the width of a premolar
Malocclusion
open bite: maxillary anterior teeth do not overlap or contact mandibular anterior teeth
anterior edge to edge bite: incisal surfaces on maxillary and mandibular teeth occlude
Posterior end to end bite: cusps of maxillary teeth occlude with cusps of opposing mandibular teeth
Deep overbite: incisal edges of maxillary anterior teeth are at a level of the cervical third of mandibular anterior teeth
Crossbite: one or more of the mandibular teeth are located facial to their maxillary counterparts
Malpositions
facioversion: tooth that is positioned facial to its normal position
linguoversion: tooth that is positioned lingual to its normal position
supraversion: the extension of a tooth is beyond the plane of occlusion
rotated (torsiversion): a tooth that is turned in relation to its normal position