Orthodontics-Diagnosis and treatment planning

1. DIAGNOSIS & TREATMENT
PLANNING
ANALYSIS OF THE DENTITION & OCCLUSION
• -BOLTON ANALYSIS
• -SPACE ANALYSIS
• -MIXED DENTITION ANALYSIS

2. Balance
• BETWEEN THE MESIODISTAL DIAMETER
( SIZE )
• OF MAXILLARY & MANDIBULAR TEETH

3. BOLTON TOOTH RATIO
ANALYSIS

4. Bolton’s Tooth size ratio
• Overall ratio
= mesiodistal width of all mand (12) teeth x 100
mesiodistal width of all max (12) teeth
= 91.3 %
. Anterior ratio
= mesiodistal width of all anterior mand (6) teeth x 100
mesiodistal width of all anterior max (6) teeth
= 77.2 %

5. Crowding and spacing

7. Tooth size

8. Arch perimeter

10. Curve of spee measurement

11. MIXED DENTITION ANALYSIS
• -Estimate of the size of permanent
canines and premolars
• -Estimate of the available space in
permanent dentition

12. Mixed dentition

13. Mixed dentition

15. Huckaba’s Analysis
X Y
True width of premolar on cast x True width of primary molar on cast
True width of premolar on x-ray True width of primary molar on x- ray
x’ Y’
X = Y x X
Y’

16. Moyer’s prediction table

17. Digital models