3rd class

Question 1

When does mand perm 1st molar erupt?

Answer 1

6 yrs

Question 2

When does max perm 1st molar erupt?

Answer 2

6 1/4 yr

Question 3

When does mand perm CI erupt?

Answer 3

6 1/4 yr

Question 4

When does max perm CI erupt?

Answer 4

7 1/4 yr

Question 5

When does mand perm LI erupt?

Answer 5

7 1/2 yr

Question 6

When does max perm LI erupt?

Answer 6

8 1/4 yr

Question 7

When does mand perm canine erupt?

Answer 7

10 1/2 yr

Question 8

When does mand perm 1st PM erupt?

Answer 8

10 1/2 yr

Question 9

When does mand perm 2nd PM erupt?

Answer 9

11 1/4 yr

Question 10

When does mand perm 2nd molar erupt?

Answer 10

12 yr

Question 11

When does mand perm 3rd molar erupt?

Answer 11

20 yr

Question 12

When does max perm canine erupt?

Answer 12

11 1/2 yr

Question 13

When does max perm 1st PM erupt?

Answer 13

10 1/4 yr

Question 14

When does max perm 2nd PM erupt?

Answer 14

11 yr

Question 15

When does max perm 2nd molar erupt?

Answer 15

12 1/2 yr

Question 16

When does max perm 3rd molar erupt?

Answer 16

20 yr

Question 17

Once the root is ____ % completed, it can handle hardware used as space maintainers

Answer 17

50%

Question 18

When the second primary molars are lost, the first permanent molars move forward (mesially) relatively rapidly, into the ________

Answer 18

Leeway space.

Question 19

When the second primary molars are lost, the first permanent molars move ______ (in what direction) relatively rapidly, into the Leeway space.

Answer 19

forward (mesially)

Question 20

This movement (molars moving mesially) _______ both arch length and arch circumference, which are related but not the same thing, and are commonly confused.

Answer 20

decreases

Question 21

Majority of the Leeway space is used by _____ mvmnt of

the molars.

Answer 21

mesial movement

Question 22

Both _______, and _________ tend to

decrease during the transition of the molars moving mesially into the leeway space

Answer 22

arch length (L) and arch circumference (C)

Question 23

Because of the incisor liability, a normal child will go through a
transitory stage of mandibular incisor crowding at age ____ to _____
•Even if there will eventually be enough room to accommodate all the
permanent teeth in good alignment.

Answer 23

8 to 9.

Question 24

In other words, a period when the mandibular incisors are
slightly crowded is a normal developmental stage, and by the
time the ____ teeth erupt, space is once again adequate
under normal conditions.

Answer 24

canine

Question 25

Does the jaw grow in the posterior or anterior segment?

Answer 25

Posterior portion of jaw

Question 26

What are the 3 sources where extra space in A-P dimension of mandible comes from?

Answer 26

* Increase in the width of the dental arch. * Labial positioning of the permanent incisors. * Repositioning of mandibular canines.

Question 27

As growth continues, the teeth erupt in what 2 directions?

Answer 27

Upward and outward

Question 28

The increase in arch width is about ___ mm on average

Answer 28

2 mm

Question 29

More width is gained in the which arch? , and more is gained by boys than girls.

Answer 29

Maxillary arch

Question 30

More width is gained in the maxillary arch than in the | mandibular, and more is gained by which gender?

Answer 30

Boys

Question 31

Do girls or boys have a greater liability to incisor crowding particularly mandibular incisor crowding?

Answer 31

Girls

Question 32

The primary incisors tend to be quite ______

Answer 32

upright

Question 33

As the permanent incisors replace them, the perm teeth lean slightly _____ (in what direction), which arranges them along the arc of a larger circle.

Answer 33

forward

Question 34

Although this change is also small (proclination of perm incisors), it contributes __ to __ mm of additional space in the average child.

Answer 34

1 to 2 mm

Question 35

As the permanent incisors erupt, the canine teeth not widen in what 2 directions into the primate space?

Answer 35

Out and back

Question 36

As the permanent incisors erupt, the canine teeth not only widen out slightly but move slightly back into the ____ space

Answer 36

primate space.

Question 37

How much space is the backward and outward movement of the erupting mandibular canines, how much space is created?

Answer 37

1 mm

Question 38

From a profile view, the molar surface lie on the arch or circle which, continued posteriorly touched the anterior border of mandibular condyle. - concave in mand; convex in max

Answer 38

Curve of spee

Question 39

•From frontal view, it is the mediolateral curve that contacts the buccal and lingual cusp tips on each side of the arch.

Answer 39

Curve of Wilson

Question 40

In ortho, do you want the curve of spee or not?

Answer 40

No

Question 41

In contrast to the anterior teeth, the permanent premolars are _____ than the primary teeth they replace.

Answer 41

smaller

Question 42

Lower E is __ mm larger than the second premolar.

Answer 42

2 mm

Question 43

Upper E is __ mm larger.

Answer 43

1.5 mm

Question 44

Lower D is slightly larger than the 1st premolar. Only | contributes an extra ____ mm.

Answer 44

0.5 mm

Question 45

Upper D is almost ___ mm larger than the first premolar.

Answer 45

equal/ 0 mm

Question 46

Mandibular arch contains about ___ mm | of what is called Leeway space per quadrant

Answer 46

2.5

Question 47

Maxillary arch has a Leeway Space | about ___ mm on the average per quadrant

Answer 47

1.5 mm

Question 48

``` •In mixed dentition with primate spaces, eruption force of the 1st permanent molar is sufficient to push primary 1st and 2nd molars forward to close the primate space. •This space closure due to eruption force of 1st permanent molar called ______ ```

Answer 48

Early | Mesial Shift.

Question 49

``` •In mixed dentition with primate spaces, eruption force of the ______ tooth is sufficient to push primary 1st and 2nd molars forward to close the primate space. •This space closure due to eruption force of 1st permanent molar called Early Mesial Shift. ```

Answer 49

1st permanent molar

Question 50

``` •When no spaces exist, the erupting 1st permanent molar is not able to move mesially. •In these cases when the primary molars exfoliate the permanent molars migrate mesially to use up the Leeway Space. ```

Answer 50

Late Mesial Shift

Question 51

When primary second molars are lost, both the maxillary and mandibular molars tend to shift mesially into the leeway space, but the ____ molar normally moves mesially more than its maxillary counterpart.

Answer 51

mandibular

Question 52

The flush terminal plane can lead to end on the relationship of permanent molars or can lead to Class __ permanent molar occlusion with forward growth of mandible.

Answer 52

Class I

Question 53

The mesial step can lead to Class I permanent molar relationship and with forward growth of mandible can lead to Class __ molar relationship.

Answer 53

Class III

Question 54

The distal step can lead to Class __ permanent molar relationship and with forward growth of mandible can lead to end on occlusion of permanent molars.

Answer 54

Class II

Question 55

If a child has a flush terminal plane molar relationship, about ___ mm of movement of the lower molar forward relative to the upper molar is required for a smooth transition to a Class I molar relationship.

Answer 55

3.5 mm

Question 56

About ___ of this distance can be obtained from the leeway space, which allows greater mesial movement of the mandibular than the maxillary molar.

Answer 56

half

Question 57

``` The other half of the 3.5 mm needed to turn flush terminal plane into class I occlusion not supplied by leeway space is supplied by _____ of the lower jaw, carrying the lower molar with it. ```

Answer 57

differential growth

Question 58

_____ quantifies the amount of needed space (crowding/ spacing) within the arches estimating the severity of space discrepancy.

Answer 58

Space analysis

Question 59

``` •Tanaka and Johnston analysis is a mixed dentition analysis which allows one to estimate the space available in an arch for the permanent teeth to erupt. •All you need to do is to measuring the ___ width of what teeth? ```

Answer 59

MD width of all lower incisors.