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19 Cards in this Set
- Front
- Back
Full face aspect symmetry relationship
(four things) |
distance bt the eyes
width of base of nose same as distance of two eyes width of mouth = interpupillary distance outer aspect of eye consistent of gonial angle of jaw |
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sagittal view (thirds) 1st, 2nd and 3rd
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1st = hairline to base (bridge) of nose
2nd = maxillary 3rd = mandibular portion of face nose to mouth (1/3) and mouth to chin (2/3) |
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methods of facial form analysis
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1. amt of tooth display
2. smile arch - curvature of lower lip should correspond to upper incisors 3. transverse/buccal corridors 4. evaluate ceph based on class I, II, III profile 5. lip position (over/under supported |
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limitatoins of facial form analysis
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- short anterior face height usually in lower 3rd
- ong anterior face hight in middle 3rd - high angle inidicated downward backward rotation of lower jaw |
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when was the ceph developed
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mid 20th century
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what was the ceph first called
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downs analysis
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two major advantages of ceph
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- directly view relationship of dental arches to underlying structures and the relation to each other
- evaluate growth changes in response to tx |
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5 areas to identify on a ceph
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- craial base
- skeletal maxilla - dental maxilla - skeletal mandible - mandibular dentition |
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how do you determine if incisors are retrusive/protrusive
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usually related to point A and point B
- anterior teeth 2mm in front of point A - posterior teeth 2mm behind point B |
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how do you determine Class I, II, or III
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use A and B angle - tells skeletal classification
- can have class I skeletal with a class II dental relationship |
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what three things can be used for superimposition
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- cranial base
- maxilla (skeletal bone not teeth) - mandible (chin or mandibular canal) |
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space analysis major assumptions
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- correlation bt size of eruptoin and mand incisors to size of remaining unerrupted max canines and premolars
- pt base to derive prediction - assume all succ teeth are developing normally - assume you can predict space analysis accurately (human error and viewing inside the mouth) - incisors will not change in a way that increases or decreases arch circumference and available space (flaring or retroclined) |
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what is the rationale for ecpecting decreased accuracy in children without class I relationship
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class II - lower incisors flare out to compensate (have more arch space in mand than normal)
class III - lower incisors are retroclined decreasing space class I - child looses 1st primary molar early and perm can shift mesially giving false reading |
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what materials are needed to perform space analysis
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accurate study casts (1st molars and central and lateral incisors)
- boli gauge and space analysis form - tanaka-johnson |
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how do you interpret class I, II, and III space analysis with incisors
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class II - flaring - increased space "apparent" not really more space
class III - retroclined class I - molars end to end on distal aspect - mesial shift of upper first molar into leeway space |
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major characteristics of malocclusion
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normal = Aranglment of max teeth to mand teeth (Harmonious line where occlusal grooves line up and go into incisal edges)
class I normal with no crowding or spacing class I mal - crowding, cross bite, open bite, deep bite class II mal - molar classification plus above class III mal - molar classificatoin plus above |
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skeletal xbite different from dental xbite
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- measure rule of thumb
- measure width of palate - normal with xbite = dental - narrow palate (thumb doesn't fit) = skeletal xbite |
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skeletal differentiated from dental class II or III
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- profile from ceph or clinic
- class II - mand deficient - class III - mand excessive |
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describe ceph open and deep bite
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open = short ramus and palatal plane tipped up (posterior down = open bite)
deep = anterior very short face. low angle plane - can bee measure on ceph. clinically see a lot of tooth overlap |