History Of Ortho

Question 1

What 3 things does the orthodontist do?

Answer 1

-Deal with facial growth and from and their undesirable effects on oral function and facial esthetics
-Control or modifications of some aspects of growth
-Movement of jaws to mask undesirable facial features

Question 2

Are malocclusions life threatening?

Answer 2

No, only a few are physically disabling

Question 3

What do some malocclusions interfere with?

Answer 3

Oral function
Hygiene
Impair mastication
Impair speech

Question 4

Who is the father of orthodontics

Answer 4

Norman Kingsley, had cleft palate correction appliances.
“Jumping the bite with the use of a bite plate”

Question 5

Who is the father of modern orthodontics?

Answer 5

Edward H. Angle
Invented many appliances to help correct malocclusions
Final appliance= edgewise system
Believed if you placed the teeth in alignment the jaws will follow

Question 6

Angles classification

Answer 6

Upper first molars were the key to occlusion
MB cusp of the upper first molar occludes in the buccal groove of the lower first molar

Question 7

Line of occlusion

Answer 7

Arch form description
Follows a catenary curve

Question 8

Maxilla line of occlusion

Answer 8

Curve should pass through the central fossa of the posterior teeth and lie along the cingulum of the anterior teeth

Question 9

Mandible line of occlusion

Answer 9

Same line runs along the buccal cusps and Incisal edges of the lower anterior teeth

Question 10

Displacements from the line of occlusion

Answer 10

Forms various versions

Question 11

Normal occlusion

Answer 11

Angles first postulate plus a proper line of occlusion

Question 12

angle class 1 malocclusion

Answer 12

Normal relationship of the first molars
Line of occlusion is incorrect because of malposed teeth, rotations, or other causes

Question 13

Angle class II malocclusion

Answer 13

Lower molar distally positioned relative to upper molar
Upper canines are mesial to the lower canines
Line of occlusion is not specified

Question 14

Angle class II Division 1

Answer 14

Protruding maxillary incisors.
May be associated with
-underdeveloped lower jaw
-protrusive upper jaw
-narrow arch form
-flared lower incisors

Question 15

Angle class II division 2

Answer 15

Returning of bunched maxillary incisors
May be associated with:
-underdeveloped lower jaw
-deep bite
-lateral or canines tend to be in labioversion while the centrals are upright with minimal overjet

Question 16

Angle class III Malocclusion

Answer 16

Mesialized relationship of the lower first molar to the upper by one-half cusp width or more
Upper canines are distal to the lower canines
Line of occlusion not specified
Associated with :
-overdeveloped lower jaw
-underdeveloped and constricted upper jaw
-dental compensations : upright lower incisors, flared upper incisors

Question 17

Pros of angle

Answer 17

Simple
Widely accepted
Has stood the test of time

Question 18

Cons of angle

Answer 18

Focuses on on the dentoalveolar relationships
Fails to recognize skeletal differences
Ignores facial esthetics
Does not include the vertical and transverse dimensions
Does not recognize tooth size differences

Question 19

Angles classification has been extended to include what other skeletal patterns?

Answer 19

Orthognathic or class I skeletal
Retrognathic of class II skeletal

Question 20

5 main characteristics of modern orthodontic classification that leads to the development of diagnosis

Answer 20

Intra-arch alignment
Soft tissue profile
Transverse plane of space
Saggital or A-P plane of space
Vertical plane of space

Question 21

Evaluating the facial profile

Answer 21

Help anticipate the skeletal and occlusal relations