Orthodontic Diagnosis and Treatment Planning

Question 1

What are the three limitations of Angle’s Classification

Answer 1

only considers the AP plane
does not include intra-arch problems (crowding/spacing)
does NOT discriminate between skeletal and dental malocclusions

Question 2

This is determining potential solutions for the identified problems and integrating them into a cohesive “plan”

Answer 2

treatment planning

Question 3

What are the five Ackerman and Proffit’s classifications of malocclusion

Answer 3

1; facial proportion and esthetics
2; alignment and symmetry within dental arches
3; skeletal and dental relation in the transverse plane
4; skeletal and dental relations in the anterior-posterior plane
5; skeletal and dental relations in the vertical plane

Question 4

This is relating to disease or pathologic process

Answer 4

pathology

Question 5

What is important to remember when creating a treatment plan

Answer 5

prioritize the developmental problem

Question 6

What are the three sequence of steps in treatment planning

Answer 6

control all disease states first
setting priorities for orthodontic treatment
balance between patient’s wishes and the severity of the problem

Question 7

What are three factors in the choice of a specific plan

Answer 7

interaction; among various possible solutions
compromise
cost-risk/benefit analysis

Question 8

What is the goal of treatment

Answer 8

to idealize esthetics, occlusion, and stability

Question 9

What are for indications involving need for treatment

Answer 9

psychosocial indications
developmental indications
functional indications
trauma/disease control

Question 10

Whats the difference when doing the Tanaka-Johnston with mixed dentition vs permanent dentition

Answer 10

Don’t divide by 2 in permanent dentition

Question 11

What is the average SNA for adults and children

Answer 11

adults; 82 ± 3

children; 81 ± 3

Question 12

What is the average SNB for adults and children

Answer 12

adults; 80 ± 3

children; 78 ± 3

Question 13

Want is the average ANB (SNA-SNB) for adults and children

Answer 13

adults; 2 ± 2

children; 3 ± 2

Question 14

If the SNA measurement is > or < than the average, what does that mean

Answer 14

> means protrusive maxilla

< means retrusive maxilla

Question 15

If the SNB measurement is > or < than the average, what does that mean

Answer 15

> means protrusive mandible

< means retrusive mandible

Question 16

If the ANB measurement is > or < than the average, what does that mean

Answer 16

> means class II tendency
< means class III tendency

Question 17

The average of the MP to FH (mandibular plane (follow the body)) to the gonial angle (tragus) is what

Answer 17

22 ± 3

Question 18

If there is a high MP what does that mean

Answer 18

unfavorable hyperdivergent pattern

Question 19

If there is a low MP what does that mean

Answer 19

hypodivergent pattern (class III)

Question 20

What is the mean of the upper incisor to FH (U1FH)

Answer 20

110±5

Question 21

What does it mean if the U1FH is > or <

Answer 21

proclined = >
retroclines = <

Question 22

What is the mean of L1 to MP

Answer 22

90±6

Question 23

What does it mean if the L1MP is > or <

Answer 23

> = proclined L1
< = retroclined L1

Question 24

What is the mean of the intercisal angle U1 to L1, and if it is > or <

Answer 24

135 ± 5
> means retroclined
< means proclined

Question 25

What is the measurements of the E line

Answer 25

U lip should be 4mm behind

L lip should be 2 mm(±2) behind