Flashcards in Oc 1 Deck (23)
horizontal alignment is a balance between?
tongue and cheek/lips
tongue thrsuting may acuse?
lip muscles may cause?
intercuspation prevents deviation in?
buccal or lingual direction
the size and shape of the jaws and teeth can affect the alignment of?
teeth, spacing, and the resulting curvature of the dental arch
curve of spee
the buccal cups of posterior teeth conform to an even curve in an 'anterior to posterior' direction
curve of wilson
a transverse occlusal curve of posterior teeth in a right to left direction as a seen from the posterior view
curve of monson
a spherical curve of approximately 8 inches resting on the buccal cusps of the mandibular posterior teeth (combo of wilson and spee)
1) man posterior tooth crowns tip lingually. Max posterior teeth have a slight buccal inclination
2) from a lateral (B/F) view, all teeth have a slight mesial inclination. The anterior teeth have a slight labial protrusion
a position of the mandible relative to the maxilla. THis position is a stable and reproducible position generally described as the most anterior, upward, unstrained position of the mandibular condyle in the glenoid fossa
a position determined by the way the teeth contact, when the mandible and maxilla are in centric relation a more commonly used tern when teeth are inthe greatest interdigitation is 'maximum intercuspation'
when closed in maximum intercuspation, the maxillary teeth usually ?
overlap the mandibular teeth to the facial
'Overjet; refers to the amount of facial horizontal overlap of the?
maxillary anterior teeth
'overbite' refers to the amount of vertical overlap of the?
maxillary anterior teeth below the edges of the mandibular anterior teeth
cross-bite occurs when?
mandibular teeth are located facial to the maxillary teeth
open bite is the situation when?
maxillary teeth do not contact mandibular teeth when in maximum intercuspation
class 1 skeletal classification?
mesiobuccal cusp of the maxillary first molar is in line with the mesiobuccal groove of the mendibular first molar
class 2 skeletal classification?
mesiobuccal cups of the maxillary first molar is mesial to the mesiobuccal groove of the mandibular 1st molar
**HAS TWO DIVISIONS**
class 3 skeletal classification?
mesiobuccal cusp of the maxillary 1st molar is distal to the mesiobuccal groove of the mandibular first molar
angles of classification
based on the relationship of the permanent first molar to each other. other classification exist based on the positions of canines and incisors
skeletal classifications in general?
class 1= normal maxilla-mandible relation
class 2= mandible distal to the maxilla
class 3= mandible mesial to the maxilla
class 2 division 1
molars in class 2, but maxillary incisors in normal position