Lecture 2 Flashcards Preview

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Flashcards in Lecture 2 Deck (23):
1

What is the first stage of eruption?

-Occurs at age 6
-Contains mandibular central, mandibular first molars and maxillary first molars

2

Dental age 8 is characterized how?

-Eruption of the maxillary lateral incisors

3

What age to most patients receive phase I orthodontic treatment if necessary?

-Dental age 8

4

What characterizes dental age 11?

-Eruption of the mandibular canines
-Mandibular first premolars
-maxillary first premolars

5

What is considered the best stage of development to start full orthodontic treatment or phase II treatment?

-Dental age 11

6

What characterizes dental age 12?

-Eruption of the maxillary canine
-maxillary second premolars
-Mandibular second premolars
-Mandibular and maxillary second molars erupt a few months later

7

What characterizes dental age 15?

-Roots of all permanent teeth except third molars are complete

8

For pre-emergent eruption to occurs what has to happen?

-First (resorption of the bone and the primary tooth roots)
-Second (Propulsive mechanism to move the tooth in the direction where the overlying path has been cleared)

9

Cleidocranial dysplasia is caused by a mutation in what?

-CBFA1 gene

10

In cleidocranial dysplasia, the permanent teeth do not erupt because of what reason?

-Abnormal resorption of both the overlying bone and primary teeth

11

T/F The rate of bone resorption and the rate of tooth eruption are controlled physiologically by the same mechanisms

False
-They are not controlled by the same mechanism

12

What is the rate limiting factor in pre-emergent eruption?

-Resorption of the overlying bone and primary tooth

13

T/F when the overlying obstructions are removed the tooth can typically erupt

True

14

If the eruption of a tooth is mechanically blocked the proliferating apical area will do what?

-Move in the opposite direction that could lead to a dilaceration

15

What is primary failure of eruption?

-Failure of permanent teeth to erupt in the absence of mechanical obstruction

16

T/F In Primary failure of eruption the more posterior the teeth are the less frequently they are affected

False
-The more they are affected

17

T/F PFE is typically seen as being symmetrical

False
-Asymmetrical

18

What are the two phases of post-emergent eruption?

-Juvenile phase
-Adult phase

19

When does the juvenile phase begin?

-Once a tooth emerges into the mouth

20

Tooth eruption is stopped by a force for what time period?

-One to three minutes

21

What two forces oppose eruption of teeth?

-Chewing forces
-Soft tissue forces (lips cheeks and tongue)

22

T/F Soft tissue pressure are probably more important in controlling tooth eruption that the heavy pressures that occur during chewing

True

23

What can cause a posterior open bite?

-Primary failure of eruption
-Ankylosis
-Lateral tongue thrust