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35 Cards in this Set
- Front
- Back
What does late mesial shift mean?
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mesial drift specifically of the permanent 1st molars into the leeway space.
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What does "centric" mean with regard to occlusion?
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a supporting cusp that stops you from biting down further
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Which of the following BEST describes a centric holding cusp of a mandibular left second molar?
a.It is the distofacial cusp and occludes in the embrasure between maxillary first and second molars. b.It is the distofacial cusp and occludes in the central fossa of a maxillary second molar. c.It is the distolingual cusp and occludes in the embrasure between maxillary first and second molars. d.It is the distolingual cusp and occludes in the central fossa of a maxillary second molar. |
b.It is the distofacial cusp and occludes in the central fossa of a maxillary second molar.
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What's the difference between occlusion and articulation?
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occlusion is the static relationship of teeth
articulation is the dynamic relationship of teeth |
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What does it mean that babies are obligate nasal breathers?
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They position jaw forward to lower tongue to breath through nose.
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What does it mean that babies have reflex suckling?
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They position tongue on lower lip to take milk on tongue back to the throat.
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What accounts for the creation of interdental space on the mand. and
lengthening of the jaw? |
Permanent teeth erupt lingually to primary teeth.
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What are the opposing contacts of the primary max. central incisor?
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mand. Central incisor, mesial 1/3 of lateral incisor
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What are the opposing contacts of the primary max. lateral incisor?
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distal 2/3 mand. lateral incisor, part of canine mesial to cusp tip
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What are the opposing contacts of the primary max. canine?
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part of mand. canine distal to cusp tip, mesial part of MB cusp of mand. 1st molar
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What are the opposing contacts of the primary max. 1st molar?
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distal 2/3 of mand. 1st molar, MMR & MTF of 2nd molar
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What are the opposing contacts of the primary max. 2nd molar?
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all of mand. 2nd molar except its MMR & MTF
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What are the opposing contacts of the primary mand. central incisor?
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mesial 2/3 of max. central incisor
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What are the opposing contacts of the primary mand. lateral incisor?
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distal 1/3 of max. central incisor
mesial part of max. lateral incisor |
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What are the opposing contacts of the primary mand. canine?
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distal part of max. lateral incisor
mesial part of canine |
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What are the opposing contacts of the primary mand. 1st molar?
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distal part of max. canine
mesial 2/3 of max. 1st molar |
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What are the opposing contacts of the primary mand. 2nd molar?
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distal 1/3 of max. 1st molar
max. 2nd molar |
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Which of the primary teeth have only one opposing tooth?
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Max. 2nd molar and mand. central.
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"Step Relationships" refer to what tooth?
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primary mand. 2nd molar
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Where are the primate spaces found?
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mesial to the canines in the maxilla
distal to the canines in the mandible |
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What changes occur to the maxilla during facial growth?
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bone is added at the sutures and tuberosity posteriorly
maxilla is translated downward and forward bone is remodeled away from anterior surfaces (except for anterior nasal spine) |
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Who came up with the Functional Matrix Theory, and what does that theory state?
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Melvin Moss
Facial bones grow in response to function not genes. Determinant of growth is in soft tissues. |
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Which arch is the diagnostic arch when looking at primary dentition to predict crowding?
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mandibular
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What is incisal liability?
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transient crowding in mandibular permanent incisors due to their being larger mesiodistally than their deciduous counterparts
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What is the difference in m-d dimension in the primary incisors vs. permanent incisors?
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1.6 mm
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By what age is arch form and width established?
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9 months
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Arch width is basically established by 9 months of age, but a change in arch widths comes later in life. When does this occur and by how much?
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when the permanent canines erupt
~ 2mm increase in width (boys>girls, max.>mand.) |
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Who is Edward H. Angle?
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The father of modern orthodontics
Instructor of Prosthodontics Founder of the Angle Schools of Orthodontia Responsible for the permanent molar relationship classifications |
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How much Leeway space is there in the mand. arch?
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5mm
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What can Leeway Space be used for?
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mesial movement of the molars
alignment of mand. incisors (incisal liability) |
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From where to where is arch length/depth measured?
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from the mesial surface of the permanent 1st molars to a point between the central incisors
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What is the definition of arch circumference and what are its values for the mand. and max. arches?
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the sum of the M-D diameters of the teeth of an arch
mand: 126mm max: 128mm |
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What permanent molar relationships can distal step lead to?
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class II and end-on-end
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What permanent molar relationships can flush terminal plane lead to?
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end-on-end and class I
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What permanent molar relationships can mesial step lead to?
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class I and class III
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