Mixed Dentition- FINAL- Retrouvey

Question 1

The difference in sizes of the primary anterior incisors and the permanent anterior incisors=

Answer 1

incisor liability

Question 2

Lower permanent incisors erupt ___ to the primary

How does the effect the arch?

Answer 2

lingually

arch size decreases

Question 3

Upper permanent incisors erupt ___ to the primary incisors.

How does this effect the arch?

Answer 3

labially/facially

Arch size increases

Question 4

Dental arch measurement include:

Answer 4

1. arch length
2. arch width
3. arch perimeter
4. inter canine distance

Question 5

Measured at the midline to a tangent touching the distal surfaces of the second primary molars

Answer 5

arch length (depth)

Question 6

Arch length is measured at the midline to a tangent touch the ___ surfaces of the ____

Answer 6

distal surfaces; second primary molars

Question 7

The arch length is stable once the:

Answer 7

permanent incisors are in

Question 8

If one sees “growth” of the arch length after the primary incisors are in, this is due to _____ and actually growth.

Answer 8

displacement in space

Question 9

Arch length changes include:

Answer 9

1. lose arch length in the lower arch (due to lower incisor eruption)
2. gain arch length in the upper arch (due to upper incisor eruption)

Question 10

Measured between the cusps of the canines tips in the transverse plane

Answer 10

arch width

Question 11

Measured between the occlusal grooves of the second primary molars

Answer 11

arch width

Question 12

arch widths are give in ___ measurements

Answer 12

2 different measurements (which allows you to estimate the transverse development of the arches)

Question 13

Although “there are no significant changes from primary to mixed dentition in the lower arch width”, there is about 4mm of changes between ages:

Answer 13

4-12 years old

Question 14

Intercanine distance increases until age ____ in girls and ___ in boys

Answer 14

10-11 in girls; 11-12 in boys

(+3-4 mm roughly)

Question 15

Measured from the distal surface of the second primary molar around th arch over the contact points and incisal edges in a smoothed curve:

Answer 15

arch perimeter

Question 16

Arch perimeter before treatment is referred to as:

Answer 16

baseline (T0)

Question 17

The elongation of the roots has nothing to do with:

Answer 17

tooth eruption

(rather the crown is pulling the root)

Question 18

From __ to __ years old, the primary dentition is replaced by the permanent dentition resulting in mixed dentition

Answer 18

6-13

Question 19

The permanent first molars erupt to the ____ of the primary dentition (no primary tooth replacement)

Answer 19

distal

Question 20

1st, 2nd, and 3rd molars do not:

Answer 20

replace primary dentition (erupt distal to primary dentition)

Question 21

Primary root resorption is a result of

Answer 21

permanent tooth eruption

Question 22

Permanent tooth eruption causes:

Answer 22

primary root resorption

Question 23

Put the following events in order:

A) primary tooth starts to resorb
B) permanent root develops
C) crown of permanent tooth is formed

Answer 23

1. Crown of permanent tooth is formed
2. Permanent root develops
3. Crown of permanent tooth is formed

Question 24

When does the primary tooth exfoliate and the permanent tooth erupt?

Answer 24

When the primary root is totally resorbed

Question 25

What happens when the primary root is totally resorbed?

Answer 25

the primary tooth exfoliates and the permanent tooth erupts

Question 26

When does the permanent tooth stop erupting?

Answer 26

when it reaches the occlusal plane or contacts an opposing tooth

Question 27

What gives the power to cause the primary root to resorb/baby tooth to fall out?

Answer 27

permanent tooth eruption

Question 28

What do we mean by “root development is not a main factor in eruption”

Answer 28

The root forms at the same time that the tooth erupts (IT DOES NOT PUSH THE CROWN UP)

Question 29

You shouldn’t do a panoramic x-ray before the age of:

Answer 29

8

Question 30

For eruption of permanent dentition, there are variable patterns between:

Answer 30

3-4-5

(canine, premolar 1, premolar 2)

Question 31

The tooth replacement sequence is variable in terms of:

Answer 31

1. sequence
2. timing
3. position
4. numbers
5. shape

Question 32

What are tooth eruption patterns for teeth 3,4,5?

Answer 32

• 3,4,5
• 4,3,5
• 4,5,3

Question 33

At 13 years old, describe what dentition should look like:

Answer 33

most permanent teeth should be in

Question 34

The root of the permanent tooth has to be ___ formed PRIOR to extraction of primary tooth

Answer 34

2/3 formed

Question 35

variability in tooth numbers can be a result of:

Answer 35

ethnicity

Question 36

Congenitally missing teeth are rare affecting ___ % of the population

Answer 36

3-5%

Question 37

What is the most frequently congenitally missing tooth? (in Caucasian population)

Answer 37

lateral incisor

Question 38

What are 2 common congenitally missing teeth?

Answer 38

1. maxillary lateral incisor (most frequent)
2. mandibular 2nd premolar

Question 39

A missing primary tooth = ____ meaning ___

Answer 39

no permanent successor = delayed eruption

Question 40

A missing primary tooth = ____ meaning ___

Question 41

___ effects growth of the alveolar processes

Answer 41

ankylosis

Question 42

Refers to the fusion of part of the root of a primary tooth to the underlying bone, which stops the tooth from erupting:

Answer 42

ankylosis

Question 43

Ankylosis may be due to localized defect during eruption process in the ____ whereby ___.

Answer 43

PDL; osseous

Question 44

Ankylosis becomes more prevalent in mixed dentition where occlusal level of ankylosed tooth:

Answer 44

does NOT keep up with the vertical level of the adjacent teeth

Question 45

What is responsible for keeping the teeth in contact during growth and may a role in ankylosis?

Answer 45

dentoalveolar development

Question 46

Treatment of ankylosis usually involves:

Answer 46

simply monitor these teeth (50% self correction)

Question 47

If an ankylosed tooth fails to correct itself/ fails to exfoliate, it may advisable to:

Answer 47

extract the tooth to avoid damages to the permanent dentition

Question 48

When the tooth growing is in the complete wrong position:

Answer 48

ectopic eruption

Question 49

The most common tooth for ectopic eruption:

Answer 49

mandibular canine