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Ortho midterm

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robbypowell's version from 2016-03-02 00:12

1

Question Answer
adults comprise _________% to _________% of the orthodontic population.25-30%
ortho isn't only adjustment of the growth of teeth, but also the _____ and ____ ____skeleton; soft tissue
Through ____ _____ we attempt to improve skeletal and soft tissue relationships to improve not only dental but facial estheticsgrowth modification
T/F: Without growth modification and/or favorable growth, unfavorable skeletal relationships usually result in disproportionate soft tissue relationshipsTrue
Who initially defined the orthodontic classification system we now use?Edward Hartley Angle (1899)
(angle classification) condition where the molar relationship is identical to the “Normal Occlusion” group however the teeth are irregular in alignmentClass 1 malocclusion
(angle classification) condition where the mesiobuccal cusp of the maxillary first molar occludes anterior to the mesio-buccal groove of the mandibular first molarClass 2 malocclusion
(angle classification) condition where the mesio-buccal cusp of the maxillary first molar occludes posterior to the mesio-buccal groove of the mandibular first molarClass 3 malocclusion
(angle classification) arrangement where the mesiobuccal cusp of the maxillary first molar occludes in the mesio-buccal groove of the mandibular first molar and the teeth in both arches are well aligned along the “Line of OcclusionNormal Occlusion
(extended angle classification) Someone who has a class II molar relation, but also has significant overjetClass 2 Division 1
A _____ malocclusion is characterized by asymmetric molar relationships and is described Right or Left depending on the side that is the prevailing malocclusionsubdivision
(extended angle classification) class 2 molar relation with the centrals are tucked back and the laterals are positioned forward.Class 2 division 2
T/F: skeletal and dental relationships should be assessed independentlyTrue
T/F: skeletal and dental relationships are the sameFalse (not always... often not)
facial pattern noted in certain ethnic groups with higher frequency usually characterized by class I dental relationships and forward positioning of the maxillary and mandibular dentoalveolar segmentsBimaxillary Protrusion
Class 1 occlusion (mal or normal) makes up what % of american children?80%
Class 2 occlusion makes up what % of american children?15%
Class 3 occlusion makes up what % of american children?5%
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2

Question Answer
tooth formation begins ____ week of embryonic life6th week
initial eruption of primary teeth take place before ____ years old(6 months - ) 2.5 years old
Full primary teeth have erupted by ____ years old (plus or minus 9 months)12 years old
Eruption of the primary dentition begins at ___ months with the appearance of the mandibular central incisors6 months
What are the first primary teeth to erupt?Mandibular central incisors
order that primary teeth eruptIncisors, First Molars, Canines, Second molars
inter-digitation of primary teeth occurs by age ____3 years old
T/F: crooked teeth seen in adults are usually mirrored in their primary dentitionFalse (usually not)
Most primary arches are ____ in shapeovoid
(primary dentition type) has spaces between the teeth ; none developed into crowded permanent dentitionsBaume type 1 (has no spaces)
(primary dentition type) between the teeth ; 50% developed intocrowded permanent dentitions.Baume type 2
spaces mesial to the maxillary canine and distal to the mandibular canine are called ____ spacesPrimate Spaces
Arch Circumference and arch length ____ a small amount from the time of eruption of the second primary molars until eruption of the first permanent molardecrease
T/F: Inter-proximal caries can shorten the arch length/circumference, thus reducing space available for the eruption of the succedaneous permanent teethTrue
T/F: Inter-proximal caries can lengthen the arch length/circumference, thus creating flared spatial relationships upon eruption of the succedaneous permanent teethFalse
average overbite of the primary dentition is _________ mm2 mm
average overjet of primary dentition is ___ to ___ mm1-2 mm
The terminal plane relationship of the second molars is always employed in describing the primary occlusion. It is significant in that it determines the position of what teeth on eruption?first succedaneous molars
most common primary molar relationshipFlush Terminal Plane
relationship of the maxillary and mandibular _____ is the most stable one throughout the primary dentitioncanines
what teeth relationship provides the best reference for the relationship between the maxilla and mandible in primary dentition?canines
(what class?) Mandibular canine inter-digitates in embrasure between maxillary lateral and canineClass 1
(what class?) Any relationship in which the mandibular canine interdigitates distal to this (class 1); typically the cusps will be end to endclass 2
(what class?) Any relationship in which the mandibular canine is mesial to this (class 1)Class 3
Early Mixed Dentition happens between ages ____ and ____6-9 yo
which sex commonly erupts their permanent teeth earlier?girls
what are the first permanent teeth to erupt?Mandibular 1st molars (followed immediately by max 1st molars)
what are the second permanent teeth to erupt?Mandibular central incisors (followed by max central incisors)
Flush Terminal Plane (of primary 2nd molars) results in what 1st permanent molar relationship?End to End
Mesial step (of primary 2nd molars) results in what 1st permanent molar relationship?Class I molar
Distal step (of primary 2nd molars) results in what 1st permanent molar relationship?Class II molar
late mesial shift of permanent molars comes at the expense of the ____ spaceLeeway space
early medial shift of permanent molars comes at the expense of the ____ spaceprimate space
The four maxillary permanent incisors are, on the average, ___ mm larger than the primary incisors7.6 mm
The four mandibular permanent incisors are ___ mm larger than the primary incisors.6.0 mm
Lack of inter-dental spacing in the primary dentition must be considered a serious handicap to normal alignment of the permanent ____incisors (incisor liability)
On average, maxillary central incisors position themselves ___ mm farther anteriorly than primary incisors; this can increase inter-canine arch circumference as much as _________ mm.2.2 mm; 3.0 mm
If the sizes of the anterior teeth are ____ than average in comparison to their primary counterparts, the incisor liability (which is an average) will be less.smaller
Usually incisor alignment is established by _________ yrs. of age8 yo
period from the eruption of the lateral incisors to the eruption of the canine has been referred by Broadbent as the ___ ____ stage.Ugly Duckling
Ugly duckling stage is between eruption of what teeth?lateral incisors and canines
Root closure of the permanent incisors and 1st permanent molars is not effected until after age _________.9 yo
size differential in the posterior segments is akaLeeway space
forward shifting of the 1st permanent molars is referred to as the... ‘late mesial shift.’
average overbite and overrate in adult dentition is ___ mm3 mm
Succedaneous teeth can be expected to erupt when how much of their roots are formed2/3's to 3/4
A premolar tooth moves through 1 mm of bone in approximately ___ months4-5 months
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3 (development/embryo)

Question Answer
period From fertilization through the 8th week of developmentEmbrionic period
period from week 9 to termfetal period
during what weeks do tissues develop from the original germ layers?week 4 to 8
what is the period of greatest teratogenic sensitivity?week 4 to 8
Spermatozoon fertilizes an oocyte in the formation of a _____ZYGOTE
Morula forms day ___4
Blastula forms day ___5
process of going from a bilaminar disk to a trilaminar disc is called ______Gastrulation
the 3 germ layers are formed during what week?week 3 (gastrulation week)
internal organs apart from thyroid glands, GI tract lining and bladder are derived from what germ layerMesoderm
CNS, nerves, eyes, skin are all derived from what germ layerEctoderm
enamel of Teeth are derived from what germ layer?Ectoderm (surface)
skeleton is derived from what germ layer?endoderm
Dentin of teeth derived from what subtype of ectodermNeural crest
development of face occurs primarily between what weeks?4-8
at week do pharyngeal arches begin to develop?week 4
pharyngeal arches develop from _____ ____ cellsneural crest
cranial nerve of first pharyngeal archV
cranial nerve of 2nd phar arch7
cranial nerve of 3rd phar arch9
cranial nerve of 4th and 6th arch10 (vagus)
cartilage of 1st archmeckel's cartilage
cartilage of 2nd archreichert's cartilage
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