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Ortho 1 > 3rd class > Flashcards

3rd class Flashcards

1
Q

When does mand perm 1st molar erupt?

A

6 yrs

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2
Q

When does max perm 1st molar erupt?

A

6 1/4 yr

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3
Q

When does mand perm CI erupt?

A

6 1/4 yr

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4
Q

When does max perm CI erupt?

A

7 1/4 yr

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5
Q

When does mand perm LI erupt?

A

7 1/2 yr

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6
Q

When does max perm LI erupt?

A

8 1/4 yr

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7
Q

When does mand perm canine erupt?

A

10 1/2 yr

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8
Q

When does mand perm 1st PM erupt?

A

10 1/2 yr

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9
Q

When does mand perm 2nd PM erupt?

A

11 1/4 yr

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10
Q

When does mand perm 2nd molar erupt?

A

12 yr

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11
Q

When does mand perm 3rd molar erupt?

A

20 yr

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12
Q

When does max perm canine erupt?

A

11 1/2 yr

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13
Q

When does max perm 1st PM erupt?

A

10 1/4 yr

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14
Q

When does max perm 2nd PM erupt?

A

11 yr

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15
Q

When does max perm 2nd molar erupt?

A

12 1/2 yr

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16
Q

When does max perm 3rd molar erupt?

A

20 yr

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17
Q

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

A

50%

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18
Q

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

A

Leeway space.

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19
Q

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

A

forward (mesially)

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20
Q

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

A

decreases

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21
Q

Majority of the Leeway space is used by _____ mvmnt of

the molars.

A

mesial movement

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22
Q

Both _______, and _________ tend to

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

A

arch length (L) and arch circumference (C)

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23
Q

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.

A

8 to 9.

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24
Q

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.

A

canine

25
Q

Does the jaw grow in the posterior or anterior segment?

A

Posterior portion of jaw

26
Q

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

A
  • Increase in the width of the dental arch.
  • Labial positioning of the permanent incisors.
  • Repositioning of mandibular canines.
27
Q

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

A

Upward and outward

28
Q

The increase in arch width is about ___ mm on average

A

2 mm

29
Q

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

A

Maxillary arch

30
Q

More width is gained in the maxillary arch than in the

mandibular, and more is gained by which gender?

A

Boys

31
Q

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

A

Girls

32
Q

The primary incisors tend to be quite ______

A

upright

33
Q

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

A

forward

34
Q

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

A

1 to 2 mm

35
Q

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

A

Out and back

36
Q

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

A

primate space.

37
Q

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

A

1 mm

38
Q

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

A

Curve of spee

39
Q

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

A

Curve of Wilson

40
Q

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

A

No

41
Q

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

A

smaller

42
Q

Lower E is __ mm larger than the second premolar.

A

2 mm

43
Q

Upper E is __ mm larger.

A

1.5 mm

44
Q

Lower D is slightly larger than the 1st premolar. Only

contributes an extra ____ mm.

A

0.5 mm

45
Q

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

A

equal/ 0 mm

46
Q

Mandibular arch contains about ___ mm

of what is called Leeway space per quadrant

A

2.5

47
Q

Maxillary arch has a Leeway Space

about ___ mm on the average per quadrant

A

1.5 mm

48
Q 
•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 \_\_\_\_\_\_
A

Early

Mesial Shift.

49
Q 
•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.
A

1st permanent molar

50
Q 
•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.
A

Late Mesial Shift

51
Q

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.

A

mandibular

52
Q

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.

A

Class I

53
Q

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

A

Class III

54
Q

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.

A

Class II

55
Q

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.

A

3.5 mm

56
Q

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

A

half

57
Q 
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.
A

differential growth

58
Q

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

A

Space analysis

59
Q 
•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?
A

MD width of all lower incisors.

Ortho 1 (11 decks)

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