Space Anlysis Flashcards
What is Space Analysis in Primary dentition?
* The 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
Lee-way Space
(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”.
Why Space Analysis
in Primary dentition is important?
* The available space in the arch can be:
equal, greater or smaller
than the unerupted teeth.
This becomes fundamental in determining the treatment plan that
might involve:
(5)
- Extractions.
- Eruption guidance.
- Space maintenance.
- Space gain.
- Simple monitoring.
Options for Space Analysis
in Primary dentition?
* The methods employed for MDA can be grouped into three categories:
(3)
- Use regression equations
- Use radiographs
- combination of both
Among the different MDA methods reported in the literature, those
based on the regression equations are the most widely used.
(2)
- Moyers’ probability tables
- Tanaka and Johnston (T/J) equations.
The major drawback of these analyses is applicability only after the
eruption of mandibular permanent incisors.
Tanaka and Johnston Analysis
(2)
- 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
Boston University Approach
(2)
- The original approach proposed
by Gianelly is as follows:
3+4+5 = 2D + C
(lower)
Space analysis in permanent dentition
* It determines the difference between
space available and
space required for alignment of permanent teeth
How to perform this permanent dentition analysis?
(3)
- 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. (+, =, -)
Space analysis in permanent dentition
(5)
- Visualization
- Localized
- Arch perimeter
- Segmental arch
analysis - Digital 3D scanning
Visualization
(2)
- Nothing is more important than clinical examination.
- Assessing both arches for overall evaluation of the teeth and their
alignments.
Localized
* Try to figure out where the
problem is.
(2)
- Anterior.
- Posterior.
Arch perimeter
- Always compare each arch with the ideal arch in your mind.