module 5 review

Question 1

primate spaces

Answer 1

1) 4 mm mesial to upper canine
2) 3 mm distal to lower canine

Question 2

development of primary dentition

Answer 2

1) upper incisors may look splayed apart
2) may be an upper midline diastema present
- until the canines come in
3) incisor liability is 7.6 mm
4) increase in intercanine width due to transverse skeletal growth
5) splayed teeth will correct

Question 3

how does crowding resolve

Answer 3

1 )labial positioning of the lower permanent incisor teeth
- 1-2 mm
2) increase in transverse intercanine width
3) repositioning of permanent canine - move slightly behind the primate space
4) increase in circumference of the lower anterior permanent teeth, come forward in an arch

Question 4

leeway space

Answer 4

1) 0.9 mm per upper quad
2) 1.7 mm per lower quad

Question 5

flush terminal plane

Answer 5

1) half unit class II
2) leeway space can be use in lower dentition
- lower molar moves a little more forward than the upper molar
- black to 1/4 unit class II
3 )growth
- can go to a class I

Question 6

four measurements for mixed dentition arch length analysis

Answer 6

1) direct measurement
2) estimation from proportionality table
3) johnston tanaka
4) hixon oldfather

Question 7

direct measurement method

Answer 7

1) use erupted contralateral teeth to estimate width of the unerupted teeth on other side
2) accuracy is fair to good depending on radiograph quality
3) the lower permanent canine (8mm) and both premolar teeth (7mm) are 22 mm per quadrant
4) indicates amount of crowding present
5) measurements taken from erupted teeth and unerupted teeth on a periapical radiograph

Question 8

space analysis

Answer 8

1) space available = space required
- maintain leeway space
2) space is <1-4 mm than required
- space regaining mechanics
3) >5 mm or more
- tooth mass reduction by IPR
- serial extraction

Question 9

treatment in the mixed dentition goals

Answer 9

1) should not be too long
2) show have specific aims for intervention and be time limited
3) precise tooth movement not required if second ortho treatment is anticipated

Question 10

mixed dentition treatment

Answer 10

1) maxillary expansion
2) correct anterior cross bite
3) correct protrusive maxilla
- headgear
4) correction of deep bite

cannot stop lower jaw from growing forwards!!!

Question 11

space creation in moderate of severe mixed dentition

Answer 11

1) procline lower incisors
2) distalize upper molars
3) serial extraction
4) expand the dental arch