Lecture 11

Question 1

what causes the most rapid loss in AP distance?

Answer 1

mesial tipping and rotation of perm. 1st molar and removal of primary 2nd molar

Question 2

why is early loss o a primary tooth an issue?

Answer 2

drift of perm or other primary teeth

Question 3

what 2 things makes space maintenance appropriate?

Answer 3

1-adequate available space
2-all unerupted teeth are normal

*if those 2 criteria aren’t there, additional intervention might be necessary

Question 4

when is a distal shoe indicated?

Answer 4

when the primary 2nd molar is lost before 1st perm molar erupts

Question 5

If the perm 1st molar is extracted before the eruption of the perm 2nd molar, is space maintenance necessary?

Answer 5

NO. allow the 2nd molar to drift forward

Question 6

what are the two types of expansion in dental crowding?

Answer 6

1-skeletal expansion

2-dental expansion

Question 7

what is the most common tooth to be extracted to make space for ortho?

Answer 7

premolars

Question 8

according to contemporary extraction guidelines, with less than _____mm arch discrepancy, extraction is ______ indicated

Answer 8

4mm, rarely

Question 9

according to contemporary extraction guidelines, with 5-9 mm arch discrepancy, _____ or _____ is a possibility

Answer 9

extraction or non-extraction

Question 10

according to contemporary extraction guidelines, what mm of arch length discrepancy almost always calls for extraction?

Answer 10

more tan 10mm

Question 11

what is it called when a protrusive dentoalveolar position of the max and mand arches produce a convex facial profile?

Answer 11

bi-maxillary protrusion

Question 12

what is serial extraction?

Answer 12

extraction of a deciduous tooth, followed by its perm. successor to make room for coming teeth to drift mesially

*extract 1st primary molar followed by extraction of 1st premolar

Question 13

what do some remark as disadvantages of extraction treatment to create space?

Answer 13

• detrimental facial appearance
• flat lips and retracted/sunken incisors
• narrow arch widths with large buccal corridors

Question 14

what did the study find regarding attractiveness in those who had extractive and non-extractive treatment?

Answer 14

no difference

Question 15

what did the study find regarding those who had extractions done with a combo of crowding and proclined teeth?

Answer 15

it had a positive effect on the pts profile

Question 16

when is extraction of the mandibular incisors indicated?

Answer 16

if the patient has crowding with recession and bone loss

Question 17

what are the 3 disadvantages of extraction mandibular incisors?

Answer 17

1- deeper over-bite
2-over jet
3-canine guidance may be difficult to achieve

Question 18

what is the most common situation where a general dentist extracts the wrong tooth?

Answer 18

an ortho isn’t clear on what tooth he wants extracted

Question 19

why is ortho tooth movement sometimes used for implants?

Answer 19

because the movement brings alveolar bone with it

Question 20

what is it called when you leave a tooth in a place, or its root, to help maintain bone in the area until an implant can be place?

Answer 20

root burial

Question 21

if you have missing lateral incisors, what do you do to get alveolar bone in that space?

Answer 21

allow canine to erupt (bringing alveolar bone with it) and drift mesially, then distalize it with ortho

Question 22

T/F missing lateral incisors require space maintenance until implant

Answer 22

true

*same if using a bridge

Question 23

how big is the lateral incisor compared to the central?

Answer 23

• 2/3 the size
• 80% length
• .5-1mm lower gingival height

Question 24

what is the most commonly impacted tooth?

Answer 24

3rd molars

Question 25

what is the 2nd most commonly impacted tooth?

Answer 25

max. canines

Question 26

what % of max. canines impacted? ( facts)

Answer 26

• .8-2.4%
• 2:1 female
• 90% unilateral

Question 27

are impacted canines usually palatal or buccal?

Answer 27

80% palatal

Question 28

what are the 3 things to consider when an unerupted tooth must be surgically exposed?

Answer 28

1-type of surgery
2-how to attach to the impacted tooth
3-ortho mechanism to bring tooth into the dental arch

Question 29

what are the 3 types of surgery for uncovering an impacted maxillary canine?

Answer 29

1-gingivectomy
2- apically positioned flap
3- closed eruption technique

Question 30

when attaching to the tooth it is critical to bond to the ______ surface of the impacted canine

Answer 30

bucal surface

• or as close to it as possible or else it can come in sideways/backwards
• must have space to pull it into

Question 31

T/F impacted canines should be pulled through alveolar mucosa

Answer 31

FALSE, should be pulled through keratinized tissue

Question 32

what are the 3 thing orthos use to chose a mechanical technique to erupt max canines?

Answer 32

1-tooths position
2-occlusal relationship
3- xray eval

Question 33

when do you refer an impacted max canine?

Answer 33

soon as you see mesial movement

Question 34

can you treat a patient with severe root resorption with ortho?

Answer 34

yes