2. In the name of GOD

3. Quantification of space problems
Space analysis :
Quantification of space problems

5. Because reducing protrusion reduces the amount of available space.
The space analysis results must be considered in the context of the profile,
Because reducing protrusion reduces the amount of available space.

6. It is important to quantify the amount of crowding within the arches because treatment varies, depending on the severity of the crowding.

7. Space analysis, using the dental casts.

12. Space available
Space required
compare
Space
deficiency
Space
excess OK

13. Space available:
Measuring arch perimeter: from the mesial of one first molar to the other

14. Over the contact of posterior teeth and incisal edge of anteriors:
1- dividing the dental arch into segments

15. 2- contouring a piece of wire

17. Space required:
Mesiodistal width of each erupted teeth,
Summing the widths of the teeth

18. For a child in the mixed dentition
estimating the size of unerupted permanent teeth

19. Important assumptions:
1- the anteroposterior position of the incisors is correct

20. 2- the space available will not change (growth, compensatory tipping)

21. 3- all the teeth are present

22. Estimating the size of unerupted permanent teeth

23. 1- measurement of the teeth on radiographs

24. 2- estimation from proportionality tables
Moyers Table:

27. معیارهای پیش بینی مایرز (سطح 75%)
23.0
22.5
22.0
21.5
21.0
20.5
20.0
19.5
Total mandibular- incisors width
22.6
22.3
21.8
21.3
21.2
20.9
20.6
Maxilla
Predicted width of canine and premolars
22.2
21.9
21.6
20.7
20.4
20.1
mandible

28. 29
28.5 28
27.5 27
26.5
26.0
25.5
25.0
24.5
24.0
23.5
25.9
25.6
25.3
24.8
24.2
23.7
23.4
23.1
22.9
25.7
25.4
25.1
24.6
24.3
22.8
22.5

29. Hixon and Oldfather prediction graph (Staley and Kerber revision)

30. Tanaka and Johnston + 10.5 mm = estimated width of the mandibular
canine and premolars in one quadrant
mm = estimated width of the maxillary
One half of the
mesiodistal width
of the 4 lower
incisors

31. Tooth size analysis (Bolton analysis)

34. Any questions??