Hi ! I am Swarnim Chudhary student of King George Medical University, Lucknow . I presented this slide on my orthodontic seminar conducted on 27 September 2022. Hope ! It will give you some help

1. Presented by -
Swarnim Chaudhary
(BDS FINAL YEAR)
King George Medical University
Department of Orthodontics

2. • Introduction
• Classification
• Mixed Dentition analysis
A) Space analysis
B) Mixed Dentition period
• Methods of mixed dentition analysis
• References

3. • Study Model -
• these are essential diagnostic aids , provide a three dimensional view of the maxillary and
mandibular dental arches.
• Important pre treatment record taken prior to use of fixed or removable orthodontic appliance.
• Model Analysis -
• study of maxillary and mandibular dental arches in all three planes of space (sagittal,vertical and
transverse ) .
• A valuable tool in orthodontic diagnosis and treatment planning.

4. - Based on type of dentition
• Permanent Dentition-
• Carey’s analysis
• Ashley Howe’s Analysis
• Pont’s analysis
• Linder Harth Index
• Karkhaus analysis
• Boston’s analysis

5. • Mixed Dentition -
• Radio graphic method
• Moyer’s analysis
• Tanaka Johnston method
• Stanley and Kerber method
• Nance’s analysis

6. A) Space analysis
• Purpose - to evaluate the amount of space available in the arch for the erupting
permanent canines and premolars.
• Aim - to compare the space available with the space needed. So that difference gives
us the anmount of crowding or spacing that can be expected
• Estimation - by three basic approaches as suggested by Proffit and Ackerman.
• 1) Measurement of teeth on radiograph.
• 2) Estimation from proportionality tables.
• 3) A combined approach.

7. B) Mixed Dentition Period
• Period - 6-12 years.
• Indications - Nanda (1993)
• Premature loss of deciduous canine.
• Rotation or blocking of lateral incisor because of space.
• Ectopic eruption of permanent first molar.
• Distal terminal plane relationships.

9. • Radiographs are used to estimate the size of unerupted permanent teeth.
• Traditionally, IOPA have been used to measure the mesio-distal width of
unerupted teeth.
• Method - are based on the principle that if we measure an object, which
can be seen both on the radiograph as well as in a cast, then we can
compensate for the enlargement of the radiographic image
• Formula -

12. • Advantages-
• Very easy , practical and relatively accurate method.
• Doesn’t not require any prediction table .
• Can be used in both maxillary and mandibular arches
• Disadvantages -
• Chances of error due to distortion of radio graphic image.

13. • Given by Moyer’s in 1973
• Utilises Moyer’s prediction tables.
• Prediction is based on the premise that there is a good co-relation between the
size of erupted permanent incisors with permanent canine and premolars due to
the genetic mechanism.

14. • Method-
• 1) mesiodistal width of four incisors is summed up.
• 2) find the value in horizontal table (sex wise) ,
• 3) Read downward in the appropriate vertical column to obtain the values for the
expected width of the canine and premolars.
• 4) determine the space available for 3,4, and 5 by measuring the distance between
distal surface of permanent incisor and mescal surface of first permanent molar.
• The difference will be accountable for crowding and spacing.

16. • Advantages-
• It can be done with equal reliability by the beginner and an expert.
• not time consuming and does not require any special equipment.
• can be done on the mouth as well as on the cast.
• Mandibular incisors are used for the prediction of both mandibular and
maxillary cuspid and bicuspid widths.

17. • By Tanaka and Johnston in 1974.
• Conducted study on 506 patient on Cleveland.
• Method -
• Estimated width of the mandibular canine premolars in one quadrant is
determined by adding 10.5 mm to the measured value of half of
mesiodistal width of four mandibular incisors.
• Estimated width of the maxillary canine and premolars in one quadrant is
determined by adding 11 mm to the measured value.

18. • Advantages -
• Simple , easily repeated procedure with minimum material required.
• Prediction chart and radiograph is not required.
• Disadvantages-
• Error in predicted size if patients are not from northwestern European
descent.

19. • It is combination method i.e. it uses both radiographs and measurement on
cast
• It is a revised method of Hixon and Oldfather (1958).
• Use of computer.
• Measurement are taken in both sides of arch.
• Use of Helios dial callipers (.05mm).
• Rotated premolars are not analysed.
• A prediction chart is made which is accurate nearly to 0.1 mm.
• Their method requires measurement of incisor on cast or mouth and of
premolars on radiograph.

20. • Method -
• Measure and add up width of mand. Central and lateral incisors of one side.
• Measure the unerupted premolars on I.O.P.A. of same side.
• Add the values.
• Use the prediction graph to calculate width of unerupted canine and
premolars.

21. • Advantage -
• Very accurate technique by using Helios
dial callipers.
• Disadvantage -
• Used only for lower arch.

22. • Nance concluded that the length of the dental arches from the mesial surfaces
of the permanent first molars of one side to the opposite always shortened
during the transition from the mixed to the permanent dentition.
• mesial migration of the permanent first molars occurring after the loss of
deciduous second molars.

23. • Method -
• The actual width of four mandibular incisors is measured on the cast.
• The width of the unerupted canine premolars is measured.
• In case one of the premolars is rotated, the width of the premolar on the opposite side
may be used
• Sum of value indicates space needed.
• The space available for the permanent teeth is determined with a brass wire passing
over the buccal cusp and incisal edges of teeth from the first molar to first molar.
• Subtract 3.4 mm (in the mandibular arch) and 1.8 mm (in the maxillary arch) from the
total space available to accommodate a decrease in the arch length as a result of the
mesial drift.

24. • Advantages-
• Results in minimal errors.
• Can be performed with reliablility.
• It allows analysis of both arches.
• Disadvantages-
• Time consuming.

25. • 1) S.I. Bhalajhi : Orthodontics the art and science 7 th edition
• 2) Om P Kharbanda : Orthodontics: Diagnosis andManagement of Malocclusion and
Management of Malocclusion 3rd edition.