432371195 lateral cephalo metry anlysis .pdf

432371195 lateral cephalo metry anlysis

1. A ANALYSIS

DENT 657

1//////,/,/,//,/7/

2. ANALYSIS UTILIZING THE
CEPHALOMETRIC TRACING

1) Describe the subject’s dento-facial
morphology

2) Quantitative description of morphological
deviations

3) Make diagnostic and treatment planing
decisions

2) Evaluate change over time - treatment
induced and growth process

1//////,/,/,/,///

3. Morphological Description

4 Skeletal - horizontal and vertical

+ Dental - horizontal and vertical

Comparing individual subject's tracing
to the “ideal”

+ Reference sample

Cross-sectional

Longitudinal - growth studies eg. Bolton-Brush,
Ann Arbor and Burlington

1//////,//,/,///

4. Cephalometric Analyses

+ Down's

+ Steiner's

+ Tweed's

+ McNamara's
@OSU

1//////,/,/,/,///

5. Cephalometric Evaluation

+ Identification of anatomic landmarks

Landmarks: stable reference structures
and maxillary and mandibular skeletal
and dental

+ Graphically relating the dento-facial
elements to these reference structures

+ Angular and or linear measurements

1//////,/,/,/,///

6. METHODS OF
CEPHALOMETRIC ANALYSIS

+ Two basic approaches

+ Metric approach - use of selected linear
and angular measures

+ Graphic approach - “overlay” of
individual’s tracing on a reference
template and visual inspection of
degree of variation

1//////,/,/,/,///

7. Metric Method - Use of selected
linear and angular measures

true

horizontal

8. ER

u
ETW MN
ai

N}
Wid

9. GOALS OF CEPHALOMETRIC
ANLYSIS

+ Evaluating relationships, both horizontal
and vertical of 5 major functional
components of the face:

+ the cranial base;
+the maxilla; the mandible,

+the maxillary and mandibular dento-
alveolus

1//////,/,/,/,///

10. REFERENCE LINES

+ Frankfort's Horizontal (porion to
orbitale)

+ Sella - Nasion line

+ True horizontal plane

+ True vertical plane

1//////,/,/,/,///

11. Reference Lines

12. SNA 82 + 2 deg
NA TO FH 9023 SKELETAL HORIZONTAL -
MAXILLA

deg

13. SNB 80 + 2 deg
N-PG TO FH SKELETAL HORIZONTAL -
we MANDIBLE

14. ANB 2 + 2 deg

SKELETAL HORIZONTAL - MAXILLA
TO MANDIBLE

15. FH TO GOGN 22

+5 deg

Y AXIS 59 4 6 SKELETAL VERTICAL

deg

LFH 55% OF
TFH

16. INTERINCISAL

130 + 5 deg

DENTAL - UPPER TO LOWER INCISOR

17. U1 TO FH 110 +5
deg

DENTAL - MAXILLARY INCISOR
U1 TO NA 4mm

18. L1 TO NB 25deg

L1 TO NB 4mm DENTAL - MANDIBULAR
L1 TO GOGN 91

nie ANTERIOR

19. NASOLABIAL

ANGLE 102 +8
deg

L.LIP TO E SOFT TISSUE

PLANE -2 2mm

20. Limitations of the Metric Method

+ Stable reference structures are only
relatively stable

+ Validity of landmarks
+ Error in landmark identification

1//////,/,/,/,///

21. Graphic Method

+ Template
+ Changes between 2 time points

1//////,/,/,/,///

22. Superimposition Method - on the
cranial base

23. Maxillary and mandibular
superimposition

Pre-Treatment ——
Progress

24. Limitations of Cephalometric
Analysis
+ Individual variability
+ Ethnic variability
+ Gender variability

1//////,/,/,/,///