Space Anlysis

Question 1

What is Space Analysis in Primary dentition?
* The purpose of

Answer 1

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

Lee-way Space
(2)

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.
• This size difference of the primary and
  permanent teeth is known as the “Leeway
  Space”.

Question 3

Why Space Analysis
in Primary dentition is important?
* The available space in the arch can be:

Answer 3

equal, greater or smaller
than the unerupted teeth.

Question 4

This becomes fundamental in determining the treatment plan that
might involve:
(5)

Answer 4

• Extractions.
• Eruption guidance.
• Space maintenance.
• Space gain.
• Simple monitoring.

Question 5

Options for Space Analysis
in Primary dentition?
* The methods employed for MDA can be grouped into three categories:
(3)

Answer 5

• Use regression equations
• Use radiographs
• combination of both

Question 6

Among the different MDA methods reported in the literature, those
based on the regression equations are the most widely used.
(2)

Answer 6

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

Question 7

The major drawback of these analyses is applicability only after the

Answer 7

eruption of mandibular permanent incisors.

Question 8

Tanaka and Johnston Analysis
(2)

Answer 8

• 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 9

Boston University Approach
(2)

Answer 9

• The original approach proposed
  by Gianelly is as follows:
  3+4+5 = 2D + C
  (lower)

Question 10

Space analysis in permanent dentition
* It determines the difference between

Answer 10

space available and
space required for alignment of permanent teeth

Question 11

How to perform this permanent dentition analysis?
(3)

Answer 11

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

Question 12

Space analysis in permanent dentition
(5)

Answer 12

• Visualization
• Localized
• Arch perimeter
• Segmental arch
  analysis
• Digital 3D scanning

Question 13

Visualization
(2)

Answer 13

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

Question 14

Localized
* Try to figure out where the
problem is.
(2)

Answer 14

• Anterior.
• Posterior.

Question 15

Arch perimeter

Answer 15

• Always compare each arch with the ideal arch in your mind.

Question 16

Arch Circumference

Answer 16

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

Question 17

Arch perimeter
* One on the most accurate devices to
masseur tooth mass (M-D size) is a

Answer 17

digital
caliper.

Question 18

Arch perimeter
* — can be used too, with less accuracy and more
human error.

Answer 18

Manual caliper

Question 19

Segmental arch analysis
* For each side:
(3)

Answer 19

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 20

Digital 3D scanner
(3)

Answer 20

• Using digital devices 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.
• M-D contact points of each tooth can be plotted and measured on a
  digital scanned of the arch too