Mixed Dentition

Question 1

▸The transition from primary teeth (deciduous) —> permanent teeth (succedaneous)
▸A balance of primary tooth loss and permanent tooth eruption, up to the functional occlusal plane
▸Eruption of permanent tooth leads to the root resorption of the primary tooth
▸Largely between the ages of 6-12 years old

Answer 1

Mixed dentition

Question 2

T/F: ▸The maxilla and mandible affect growth of the other

Answer 2

True

Question 3

T/F: ▸Occlusion of the teeth can affect the growth of the jaws

Answer 3

True

Question 4

▸Primary incisors are _____ than the permanent incisors

Answer 4

smaller

Question 5

Do you want spaces between the teeth in the primary dentition?

Answer 5

Yes

Question 6

▸Primary molars are ______ than their permanent successors ▸

Answer 6

larger

Question 7

________ is the following principle:
▸Primary molars are larger than their permanent successors
▸Important to maintain primary molars to accommodate for crowding

Answer 7

Leeway space

Question 8

▸Space between:
▸ upper primary lateral incisor and canine
▸lower primary canine and 1st molar
▸Extra spacing- accommodate larger permanent teeth ▸1-2mm of spacing in each arch
▸Vestige of our ‘primate” genetic heritage

Answer 8

Primate/simian space

Question 9

The primate/simian space is where in the maxilla?

Answer 9

▸ upper primary lateral incisor and canine

Question 10

The primate/simian space is where in the mandible?

Answer 10

▸lower primary canine and 1st molar

Question 11

▸Permanent incisors are larger than the primary incisors
▸Body able to self-correct via:
▸Labial tipping of perm incisors
▸Inter-canine width increase
▸Primary, primate, and leeway space utilization

Answer 11

Incisor liability

Question 12

___-____ years old:
▸Beginning stages of permanent tooth eruption with many baby teeth remaining
▸Upper and lower Perm 1st molars
▸Upper and lower perm incisors
▸Lower teeth erupt before upper
▸Focus on symmetry- less on chronological age
▸Transverse development of maxilla slows
▸Arch length is “set”
▸Ears and head are nearly at their adult size

Answer 12

6-8 years old

Question 13

During the 6-8 year old period, do the lower or upper teeth erupt first?

Answer 13

Lower teeth

Question 14

____-_____ years old:
▸Entering the “Ugly Duckling” stage
▸Perm canines push on the roots of lateral incisors ▸Lower permanent canines and upper and lower 1st premolars erupt
▸Most independent forward and down growth of the maxilla slows
▸Maxillary transverse suture initiates interdigitation ▸Anticipate CII relationship
▸Upper teeth and jaw ahead of the lower

Answer 14

8-10 years old

Question 15

____-____ years old:
▸Upper perm canines and second premolars
▸Upper and lower perm 2nd molars
▸Midline maxillary diastema begin to close after eruption of canines
▸Diastema smaller than 3mm
▸Begin to enter pubertal growth spurt (females more so, than males)
▸Mandible begins to “catch up” to the maxilla
▸Anterior-posterior relationship improves
▸* Vertical height of the face increases through skeletal maturation

Answer 15

10-12 YEARS OLD

Question 16

▸Altered eruption pathway of permanent teeth ▸Primary teeth maintained
▸Case Plan: extraction of primary laterals, lower brackets, retainer

Answer 16

Over-retained primary teeth

Question 17

▸Affected tooth is underneath the functional occlusal plane
▸Most often primary mandibular 1st/2nd molars ▸Treatment: Monitor until require dental-age appropriate extraction
▸If not address, lead to vertical bone/periodontal defects to adjacent teeth

Answer 17

ANKYLOSIS{

Question 18

Premature loss of upper and lower left primary lateral incisor
Due to severe crowding
PLAN: Space Regaining
Maxillary expansion, extraction of lower primary canines, Lower 2x4, lower lingual holding arch

Answer 18

Premature lost primary teeth

Question 19

▸Obtain pano by age 7 to:
▸Identify eruption pathway of permanent canines (and other teeth)
▸If a contralateral permanent tooth not erupt with 6 months of counterpart
▸Excessive amount of time has passed from eruption window

Answer 19

ECTOPIC ERUPTION

Question 20

______ impaction most common, after 3rd molars

Early detection is KEY

Answer 20

Canine

Question 21

If the canine gets past the ______ of the lateral incisor, there is a much lesser likelihood of spontaneous correction

Answer 21

Midline of lateral incisor

Question 22

____ causes the following:
▸Posterior cross bite
▸Anterior open bite
▸Intruded incisors

Answer 22

Thumb sucking

Question 23

▸Functional: Occlusion
▸Functional interference
▸Cause mandible to shift into maximum intercuspation ▸Untreated—> asymmetric mandibular growth ▸Skeletal/Non-functional: Skeletal growth
▸Often a unilateral cross bite is due to a constricted maxilla (unless a cleft/craniofacial patient)

Answer 23

Crossbites

Question 24

In a class 3 case with maxillary retrognathia and severe to moderate dental crowding, what is the likely treatment from 7-10 years old?

Answer 24

Reverse Pull Headgear

Question 25

_______ : two tooth buds are joined into one large tooth

▸One tooth short in the arch, if count the larger tooth as one

Answer 25

▸Fusion

Question 26

_______: one tooth bud attempts to split into two ▸Normal tooth count, if count larger tooth as one

Answer 26

▸Gemination

Question 27

What are the 2 most common teeth types that are missing teeth?

Answer 27

Maxillary lateral incisors and

Mandibular second premolars

Question 28

T/F: ▸Primary tooth condition is not always a predictor of the permanent tooth

Answer 28

True