need help me ,please solve the promblem

[malki]

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how to do mayor ,mixed dental arch analysis

how to do moyers mixed dentition analysis​

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[NYtimes]

how to do mayor ,mixed dental arch analysis

how to do moyers mixed dentition analysis​

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Have you looked at "Contemporary Orthodontics: Books: William R. Proffit ..."
??

 

[charlestweed]

Moyer's analysis uses 4 lower permanent incisors to predict the amount of crowding (or spacing) when 1st , 2nd premolars and canines erupt. In order to do this, the patient must have all 4 lower permanent incisors and all 1st permanent molars. Use boley gauge for measurement. It is a very lengthy process:

Step1: Determine space available (for mand arch)
a. measure distance between distal of #23 and distal of # 26.
b. measure distance between mesial of #19 and distal of #23 (left buccal segment)
c. measure distance between mesial of #30 and distal of #26 (right bucal segment)
d. a+b+c = space available

Step 2: Determine teeth size (for mand arch)
a. measure mesiodistal witdh of #23,24,25,26 and add them together
b. Use Moyer's chart to get the total teeth size for the unerupted mandibular 1st,2nd premolars and canine (this is just an estimate, but it is fairly accurate).
c. a + 2b (because there are both right and left buccal segments) = total mand teeth size

Step 3: space analysis
Space avail (step 1d) – mand teeth size (step 2c) = a negative # = space deficiency
Space avail (step 1d) – mand teeth size (step 2c) = a positive # = excess space

Repeat above 3 steps for max arch.

 

[malki]

thanks very much

Moyer’s analysis uses 4 lower permanent incisors to predict the amount of crowding (or spacing) when 1st , 2nd premolars and canines erupt. In order to do this, the patient must have all 4 lower permanent incisors and all 1st permanent molars. Use boley gauge for measurement. It is a very lengthy process:

Step1: Determine space available (for mand arch)
a. measure distance between distal of #23 and distal of # 26.
b. measure distance between mesial of #19 and distal of #23 (left buccal segment)
c. measure distance between mesial of #30 and distal of #26 (right bucal segment)
d. a+b+c = space available

Step 2: Determine teeth size (for mand arch)
a. measure mesiodistal witdh of #23,24,25,26 and add them together
b. Use Moyer’s chart to get the total teeth size for the unerupted mandibular 1st,2nd premolars and canine (this is just an estimate, but it is fairly accurate).
c. a + 2xb (2x b/c there are both right and left buccal segments) = total mand teeth size

Step 3: space analysis
Space avail (step 1d) – mand teeth size (step 2c) = a negative # = space deficiency
Space avail (step 1d) – mand teeth size (step 2c) = a positive # = excess space

Repeat above 3 steps for max arch.

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[malki]

in step 2
step 2 part b
to calculate c=a+2b
and what is 2b/c
and for maxillary arch we still use mandibular anterior in step 2

Moyer’s analysis uses 4 lower permanent incisors to predict the amount of crowding (or spacing) when 1st , 2nd premolars and canines erupt. In order to do this, the patient must have all 4 lower permanent incisors and all 1st permanent molars. Use boley gauge for measurement. It is a very lengthy process:

Step1: Determine space available (for mand arch)
a. measure distance between distal of #23 and distal of # 26.
b. measure distance between mesial of #19 and distal of #23 (left buccal segment)
c. measure distance between mesial of #30 and distal of #26 (right bucal segment)
d. a+b+c = space available

Step 2: Determine teeth size (for mand arch)
a. measure mesiodistal witdh of #23,24,25,26 and add them together
b. Use Moyer’s chart to get the total teeth size for the unerupted mandibular 1st,2nd premolars and canine (this is just an estimate, but it is fairly accurate).
c. a + 2xb (2x b/c there are both right and left buccal segments) = total mand teeth size

Step 3: space analysis
Space avail (step 1d) – mand teeth size (step 2c) = a negative # = space deficiency
Space avail (step 1d) – mand teeth size (step 2c) = a positive # = excess space

Repeat above 3 steps for max arch.

​

 

[charlestweed]

b/c= because (I’ve just edited step 2 part b)

In step 2 part b, you have to use the Moyer’s chart. This chart should be available in the ortho dept of your school. Or try to google it.

Yes, for maxillary, you also use the same lower 4 mandibular incisors in step 2a. The Moyer’s chart gives you predicted values for both upper and lower unerupted 1st, 2nd premolars and canines. You also have to measure the upper arch (ie distance between #3 and 7)

 

[malki]

thanks very much now it is very clear ie is about mayor space analysis i have another confusion where are occlusal contact in maxmum intescupatiion i need to see diagramatic or picture with normal occlusal contant

 

[charlestweed]

Sorry, I don’t have the occlusion diagram to show you. You get different occlusal contacts for class I, class II and class III occlusions. You should look at the dental deck. If the diagram is too confusing, you should use a typodont and articulating paper.

In centric occlusion (maximum intercuspation) for a class I patient:
-MB cusp of max 1st molar occludes in the MB groove of mand 1st molar.
-ML cusp of max 1st molar occludes in the central fossa of lower 1st molars
-MB cusp of mand 1st molar occludes in the embrasure between max 1st molar and 2nd premolar.
-Lingual cusp of max 2nd premolar occludes in the embrasure between mand 1st molar and 2nd premolar.
-Buccal cusp of mand 2nd premolar occludes in the embrasure between max 1st premolar and max 2nd premolar.

These are just a few examples. There are a a lot more occlusal contacts than the ones I describe above.