MIXED DENTITIONMIXED DENTITION
ANALYSISANALYSIS
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandent...
MOYERS MIXED DENTITIONMOYERS MIXED DENTITION
ANALYSISANALYSIS
 The purpose of a mixed dentition analysis is toThe purpose...
 The moyers analysis predicts the combinedThe moyers analysis predicts the combined
mesio-distal width of 3,4,5 based on ...
 Based on the mesio-distal width of fourBased on the mesio-distal width of four
mandibular incisors, the expected width o...
 Total mandibular width of 345Total mandibular width of 345
incisor widthincisor width
19.5 20.6, 20.119.5 20.6, 20.1
20....
HUCKABA’S ANALYSISHUCKABA’S ANALYSIS
 Here both study cast and radiographs areHere both study cast and radiographs are
us...
 YI= X1 xY2/X2YI= X1 xY2/X2
 y1= width of unerupted tooth whose measurement is toy1= width of unerupted tooth whose meas...
 Accuracy of this method of determiningAccuracy of this method of determining
the width of the unerupted tooth is fair to...
HIXON AND OLD FATHER’SHIXON AND OLD FATHER’S
 The mesio-distal width of mandibularThe mesio-distal width of mandibular
ce...
 The estimated sum total width of theThe estimated sum total width of the
cuspids and bicuspids of that particularcuspids...
 measured values estimated tooth sizemeasured values estimated tooth size
46 18.446 18.4
 47 18.747 18.7
 48 19.048 19....
Nance careys analysisNance careys analysis
This analysis is similar to arch perimeter analysisThis analysis is similar to ...
 The total mesio-distal width of all the teeth inThe total mesio-distal width of all the teeth in
each quadarent will ind...
Thank youThank you
For more details please visitFor more details please visit
www.indiandentalacademy.comwww.indiandentala...
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Mixed dentition analysis

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Mixed dentition analysis

  1. 1. MIXED DENTITIONMIXED DENTITION ANALYSISANALYSIS INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. MOYERS MIXED DENTITIONMOYERS MIXED DENTITION ANALYSISANALYSIS  The purpose of a mixed dentition analysis is toThe purpose of a mixed dentition analysis is to evalute the amount of space available in theevalute the amount of space available in the arch for the erupting permanent canines andarch for the erupting permanent canines and premolars. In this analysis the size of thepremolars. In this analysis the size of the unerupted permanent cuspids and premolars areunerupted permanent cuspids and premolars are predicted from the knowledge of the sizes ofpredicted from the knowledge of the sizes of certain permanent teeth that are already eruptedcertain permanent teeth that are already erupted in the mouth.in the mouth. www.indiandentalacademy.com
  3. 3.  The moyers analysis predicts the combinedThe moyers analysis predicts the combined mesio-distal width of 3,4,5 based on the sum ofmesio-distal width of 3,4,5 based on the sum of the widths of the four lower permanent incisors.the widths of the four lower permanent incisors.  the mesio-distal width of the four lower incisorthe mesio-distal width of the four lower incisor are measured and summed up.the amount ofare measured and summed up.the amount of space available for the 3,4and 5 after incisorspace available for the 3,4and 5 after incisor alignment is determined by measuring thealignment is determined by measuring the distance between the distal surface of lateraldistance between the distal surface of lateral incisor and the mesial surface of first permanentincisor and the mesial surface of first permanent molarmolar.. www.indiandentalacademy.com
  4. 4.  Based on the mesio-distal width of fourBased on the mesio-distal width of four mandibular incisors, the expected width of themandibular incisors, the expected width of the canines, first and second premolars arecanines, first and second premolars are predicted by referring the probability chart. Whilepredicted by referring the probability chart. While doing so,the 75%level of probability isdoing so,the 75%level of probability is considered reliable.considered reliable.  The predicted tooth size of 3,4,5 is comparedThe predicted tooth size of 3,4,5 is compared with arch length available for them so as towith arch length available for them so as to determine the discrepancy. If the predicted valuedetermine the discrepancy. If the predicted value is greater than the available archis greater than the available arch length,crowding of teeth can be expectedlength,crowding of teeth can be expected www.indiandentalacademy.com
  5. 5.  Total mandibular width of 345Total mandibular width of 345 incisor widthincisor width 19.5 20.6, 20.119.5 20.6, 20.1 20.0 20.9,20.420.0 20.9,20.4 20.5 21.2,20.720.5 21.2,20.7 21.0 21.3,21.021.0 21.3,21.0 21.5 21.8,21.321.5 21.8,21.3 22.0 22.0, 21.622.0 22.0, 21.6 22.5 22.3,21.922.5 22.3,21.9 23.0 22.6,22.223.0 22.6,22.2 23.5 22.9, 22.523.5 22.9, 22.5 24.0 23.1, 22.824.0 23.1, 22.8 www.indiandentalacademy.com
  6. 6. HUCKABA’S ANALYSISHUCKABA’S ANALYSIS  Here both study cast and radiographs areHere both study cast and radiographs are used for determining the width ofused for determining the width of unerupted tooth.unerupted tooth.  PrinciplePrinciple  with any type of radiograph, it iswith any type of radiograph, it is necessary to compensate for enlargementnecessary to compensate for enlargement of the radiographic image. This can beof the radiographic image. This can be done by measuring an object that can bedone by measuring an object that can be seen both in radiograph and on the cast.seen both in radiograph and on the cast. www.indiandentalacademy.com
  7. 7.  YI= X1 xY2/X2YI= X1 xY2/X2  y1= width of unerupted tooth whose measurement is toy1= width of unerupted tooth whose measurement is to be determinedbe determined ..  y2= width of unerupted tooth on radiograph.y2= width of unerupted tooth on radiograph.  X1=width of a tooth that has erupted measured on theX1=width of a tooth that has erupted measured on the cast.cast.  X2=Width of a tooth that has erupted,measured on theX2=Width of a tooth that has erupted,measured on the radiographradiograph www.indiandentalacademy.com
  8. 8.  Accuracy of this method of determiningAccuracy of this method of determining the width of the unerupted tooth is fair tothe width of the unerupted tooth is fair to good, depending upon the quality of thegood, depending upon the quality of the radiographs and their position in the archradiographs and their position in the arch  this technique can be used in maxillarythis technique can be used in maxillary and mandibular arches for all ethnicand mandibular arches for all ethnic groups.groups. www.indiandentalacademy.com
  9. 9. HIXON AND OLD FATHER’SHIXON AND OLD FATHER’S  The mesio-distal width of mandibularThe mesio-distal width of mandibular central and lateral incisor is obtained fromcentral and lateral incisor is obtained from the casts. Determine the width of thethe casts. Determine the width of the premolars from the intraoral periapicalpremolars from the intraoral periapical radiographs made using long coneradiographs made using long cone technique. Sum up the width of centraltechnique. Sum up the width of central and lateral incisor along with the width ofand lateral incisor along with the width of unerupted premolars of that particularunerupted premolars of that particular side.side. www.indiandentalacademy.com
  10. 10.  The estimated sum total width of theThe estimated sum total width of the cuspids and bicuspids of that particularcuspids and bicuspids of that particular side can be obtained from the chart. Everyside can be obtained from the chart. Every measured sum width of incisor andmeasured sum width of incisor and bicuspids has a corresponding sum widthbicuspids has a corresponding sum width of the cuspids and bicuspids in the chart.of the cuspids and bicuspids in the chart. www.indiandentalacademy.com
  11. 11.  measured values estimated tooth sizemeasured values estimated tooth size 46 18.446 18.4  47 18.747 18.7  48 19.048 19.0  49 19.449 19.4  50 19.750 19.7  51 20.051 20.0  52 20.352 20.3  53 20.753 20.7  54 21.054 21.0  55 21.355 21.3  56 21.656 21.6 www.indiandentalacademy.com
  12. 12. Nance careys analysisNance careys analysis This analysis is similar to arch perimeter analysisThis analysis is similar to arch perimeter analysis of the permanent dentition.of the permanent dentition. PROCEDUREPROCEDURE measure the mesio-distal width of the eruptedmeasure the mesio-distal width of the erupted permanent teeth.permanent teeth. measure the width of each unerupted tooth,measure the width of each unerupted tooth, cuspids and bicuspids (3,4,5) from the intra-oralcuspids and bicuspids (3,4,5) from the intra-oral periapical radiographsperiapical radiographs.. www.indiandentalacademy.com
  13. 13.  The total mesio-distal width of all the teeth inThe total mesio-distal width of all the teeth in each quadarent will indicate space required toeach quadarent will indicate space required to accommodate the permanent toothaccommodate the permanent tooth ..  using brass wire measure the arch perimeter.using brass wire measure the arch perimeter.  compare the space required and spacecompare the space required and space available to arrive at the arch lengthavailable to arrive at the arch length discrepancy.discrepancy. www.indiandentalacademy.com
  14. 14. Thank youThank you For more details please visitFor more details please visit www.indiandentalacademy.comwww.indiandentalacademy.com www.indiandentalacademy.com

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