Space Analysis

Question 1

What is the purpose of a MDA

Answer 1

purpose of mixed dentition analysis (MDA) is to calculate the differences between the amount of the dental arch space available and that required for accommodating the permanent teeth for planning either preventive or interceptive approach.

Question 2

What is Lee-way Space?

Answer 2

The space occupied by the primary canines and molars is greater than that required for the corresponding permanent teeth, the canine and the two premolars.
Max - 1.5mm
Mand - 2.5mm per quad

Question 3

What are the methods employed for MDA? 3 of them.

Answer 3

• Use regression equations
• Use radiographs
• combination of both.

Question 4

Most widely used regression equations are?

Answer 4

• Moyers’ probability tables
• Tanaka and Johnston (T/J) equations.

Question 5

What is the major drawback of the MDA ?

Answer 5

The major drawback of these analyses is applicability only after the eruption of mandibular permanent incisors.

Question 6

What is the tanaka and Johnston analysis?

Answer 6

Tanaka and Johnston analysis is a mixed dentition analysis which allows one to estimate the space available in an arch for the permanent teeth to erupt.
* All you need to do is to measuring the MD width of all lower incisors.

Question 7

MD of four lower incisors X 1/2 then….

Answer 7

Max +11 =
Mand +10.5 =

Question 8

The Boston U approach is

Answer 8

3+4+5 = 2D+C

Question 9

What is the space analysis in permanent dentition?

Answer 9

It determines the difference between space available and space required for alignment of permanent teeth.

Question 10

How to perform this permanent dentition analysis?

Answer 10

• Measure the mesio-distal width of each tooth mesial to the first permanent
  molar.
• The sum total of the width corresponds to the necessary space required. * Compare these two numbers together. (+, =, -)

Question 11

What does visualization mean for permanent analysis?

Answer 11

• Nothing is more important than clinical examination.
• Assessing both arches for overall evaluation of the teeth and their alignments.

Question 12

What does localized mean for permanent analysis?

Answer 12

Try to figure out where the prob is - Anterior or posterior

Question 13

What does arch perimeter mean for permanent analysis?

Answer 13

Always compare each arch with the ideal arch in mind.
Well-aligned
Proclined anteriors
Retroclined anteriors

Question 14

What does arch circumference mean for permanent analysis?

Answer 14

When you are dealing with crowded arch, accurate assessment of the arch circumference is crucial.

Question 15

What does arch perimeter mean for permanent analysis?

Answer 15

One on the most accurate devices to masseur tooth mass (M-D size) is a digital caliper.
Manual caliper can be used too but less accurate bc human error

Question 16

What do you do for each side during segmental arch analysis?

Answer 16

1. Measure M-D width of every single tooth.
2. Measure mesial of 1st molar to distal of lateral incisor.
3. Measure distal of lateral incisor to mid-line.

Question 17

A 3D digital scanner can be used to..

Answer 17

• to measure the width of each tooth by plotting mesial and distal contact points of each tooth.
• M-D contact points of each tooth can be plotted and measured on a digital cast.