Lecture 2

Question 1

What is the purpose of mixed dentition analysis (MDA)?

Answer 1

the purpose is to calculate the differences between the amount of dental arch space available and that required for accommodating the permanent teeth for planning either a preventive or interceptive approach

Question 2

What is Lee-Way space?

Answer 2

The size difference between the primary & permanent teeth

Question 3

The space occupied by the primary canines and molars is ______ compared to the space required for the corresponding permanent teeth (canine + two premolars)

Answer 3

GREATER THAN

Question 4

Why is determining the space analysis in primary dentition important?

Answer 4

It becomes fundamental in the treatment plan that might involve:

1. extractions
2. eruption guidance
3. space maintenance
4. space gain
5. simple monitoring

Question 5

The available space in the arch can be _____, _____ or ____ than the unerupted teeth

Answer 5

equal; greater; smaller

Question 6

what are the three categories of methods for a mixed dentition analysis (MDA)?

Answer 6

1. use regression equations
2. use radiographs
3. combination of BOTH

Question 7

Of the three MDA categories which method is most widely used?

Answer 7

Regression equations
(Moyers probability & Tanaka & Johnston equation)

Question 8

What are the two regression equations used in MDA?

Answer 8

Moyers probability & Tanaka & Johnson equation

Question 9

What is the major drawback with MDA methods and space analysis?

Answer 9

The applicability only AFTER the eruption of mandibular permanent incisors

Question 10

A mixed dentition analysis that allows one to estimate the space available in the arch for permanent:

Answer 10

Tanaka & Johnston analysis

Question 11

In Tanaka & Johnston, what is measured?

Answer 11

MD width of all lower incisors

Question 12

For TJ analysis, you take the MD width of all lower incisors and add _____ for maxillary and add ____ for mandibular

Answer 12

11 maxillary; 10.5 mandibular

Question 13

For TJ analysis, you take the MD width of all lower incisors and add 11 what are predicting?

Answer 13

maxillary arch canines and 2 premolars

Question 14

For TJ analysis, you take the MD width of all lower incisors and add 10.5 what are you predicting?

Answer 14

mandibular arch canine and 2 premolars

Question 15

“two times the width of the primary first molar + the MD width of the primary canine”

Answer 15

Boston university approach

Question 16

In the boston university approach what is measured? Be specific

Answer 16

2x the width of the primary first molar + width of the primary canine

(2D +C)

Question 17

The boston university approach measurements are taken on the:

Answer 17

lower arch

Question 18

List the equation for boston university approach:

Answer 18

3+4+5 = 2D + C

Question 19

Image with space maintainer (all permanent central incisors & permanent first molar, missing premolars, also some primary teeth remaining)

What is the function of the space maintainer?

Answer 19

Preventing the MD drift of the molars and shifting of the lower incisors

Question 20

What does the space analysis in permanent dentition help to determine?

Answer 20

Helps determine the difference between the space available and the space required for the alignment of the permanent teeth

Question 21

In permanent dentition space analysis, what does a (+) number mean?

Answer 21

more space is available than needed

Question 22

In permanent dentition space analysis, what does a (-) number mean?

Answer 22

less space available than needed

Question 23

In permanent dentition space analysis, what does the same number mean?

Answer 23

exact space present required for alignment of teeth

Question 24

How can you perform the permanent denition analysis?

Answer 24

1. measure the MD width of each tooth mesial to the permanent first molar
2. the total sum of the width should correspond to the necessary space required
3. compare the numbers together

Question 25

List the important factors of space analysis in the permanent dentition:

Answer 25

1. visualization
2. localized
3. arch perimeter
4. segmental arch analysis
5. digital 3D scanning

Question 26

What is the most important factor in space analysis of permanent dentition

Answer 26

Visualization - Nothing is more important than clinical examination. Make sure to assess BOTH arches for overall evaluation of the teeth and their alignments

Question 27

Describe localization in space analysis of permanent dentition:

Answer 27

Try to figure out where the problem is: anterior? posterior?

Question 28

T/F: When evaluating arch perimeter in space analysis of permanent dentition, always compare each arch with the ideal arch in your mind

Answer 28

True

Question 29

When you are dealing with a CROWDED arch, an accurate assessment of what is ideal?

Answer 29

ARCH CIRCUMFERENCE

Question 30

What is the most accurate device to measure tooth mass (MD size)?

Answer 30

Digital caliper

Question 31

T/F: A manual caliper is a better tool to measure tooth mass (MD size) than a digital caliper

Answer 31

False- a manual caliper can be used too, but with less accuracy and more human error

Question 32

List steps of segmental arch analysis:

Answer 32

1. measure M-D width of EVERY SINGLE TOOTH
2. measure the mesial of the first molar to the distal of the lateral incisor
3. measure the distal of the lateral incisor to the midline

Question 33

Using digital devices to measure the width of each tooth by plotting the mesial and distal contact points of each tooth:

Answer 33

Digital 3D scanning