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.
This size difference of the primary and permanent teeth is known as the
Leeway Space
The space occupied by the primary canines and molars is _________ than that required for the corresponding permanent teeth, the canine, and the two premolars.
greater
Total leeway space in maxillary arch?
3mm (1.5 mm each side)
Total leeway space in mandibular arch?
5mm (2.5 mm each side)
The available space in the arch can be: ___________________ than the unerupted teeth.
equal, greater or smaller
Space Analysis becomes fundamental in determining the treatment plan that might involve:
- Extractions
- Eruption guidance
- Space maintenance
- Space gain
- Simple monitoring
The methods employed for MDA can be grouped into three categories:
- Use regression equations
- Use radiographs
- combination of both
Which MDA method is the most widely used?
those based on the regression equations
What are the regression equations?
- Moyers’ probability tables
- Tanaka and Johnston (T/J) equations
What is the major drawback of the MDA analyses?
applicability only after the eruption of mandibular permanent incisors
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
What measurements do you need for a Tanaka and Johnston analysis?
the MD width of all lower incisors
What is the formula for Tanaka-Johnston Analysis?
What is the formula for Boston University Approach?
3= canine
4= 1st PM
5= 2nd PM
D= 1st primary molar
C= primary canine
What is space analysis in the permanent dentition?
determine the difference between space available and space required for alignment of permanent teeth
How do you perform a space analysis in permanent dentition?
- 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. (+, =, -)
What are the steps for analysizing space analysis in permanent dentition?
- Visualization
- Localized
- Arch perimeter
- Segmental arch analysis
- Digital 3D scanning
Why is visualization important during space analysis in permanent dentition?
- Nothing is more important than clinical examination
- Assessing both arches for overall evaluation of the teeth and their alignments
Why is localized important during space analysis in permanent dentition?
- Try to figure out where the problem is
— Anterior
— Posterior
Why is arch perimeter important during space analysis in permanent dentition?
- Always compare each arch with the ideal arch in your mind
Why is arch circumference important during space analysis in permanent dentition?
- When you are dealing with crowded arch, accurate assessment of the arch circumference is crucial
What is used to assess arch perimeter?
- One on the most accurate devices to masseur tooth mass (M-D size) is a digital caliper
- Manual caliper can be used too, with less accuracy and more human error
- 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)
For each side of a segmental arch analysis you need to measure…
- Measure M-D width of every single tooth
- Measure mesial of 1stmolar to distal of lateral incisor
- Measure distal of lateral incisor to midline
-
Hypodontia, Hyperdontia (supernumerary teeth), Impactions & Ectopic Eruptions47
-
Space Analysis; Primary - Permanent24
-
Space Maintenance46
-
Early Loss of Primary Teeth27
-
Serial Extractions18
-
Facial and Dental Asymmetry24
-
Transverse Problem31
-
Vertical Problems - Overbite Openbite22
-
Antero-Posterior Discrepancies54
-
INTERDISCIPLINARY ADULT ORTHODONTICS16
-
Aligner Therapy19
