Med Year Exam

Question 1

Orthodontics

Answer 1

the art and science which concerned with the study of growth and development , dentofacial deformity and correction of malocclusion

Question 2

• Essential diagnostic aids

Answer 2

• Study models
• Certain radiograph
• Hand wrist x ray
• Lateral radiograph
• Facial photographs

Question 3

Overjet

Answer 3

Overjet - the horizontal distance between the incisal edge of the upper central incisor and the lower labial surface of lower central incisor

Question 4

Overbite

Answer 4

Overbite - the term is defined as being the vertical distance between the incisal edge of the upper central incisor and the lower labial surface of lower central incisor

Question 5

Lee way space

Answer 5

Lee way space - the difference in mesiodistal dimension of deciduous , C , D , E and their permanent successors 3 , 4 , 5 ( canine and premolars )

Question 6

Free way space

Answer 6

Free way space - the space between the upper dentition and the lower dentition at rest position

Question 7

Gemination

Answer 7

Gemination - it is an anomalies which arises from an attempt at division of single tooth germ by an invagination , result in incomplete formation of two teeth

Question 8

The six keys of normal occlusion

Answer 8

The six keys of normal occlusion
- Molar inter arch relationship
- Mesio distal crown angulation
- Labio lingual crown inclination
- Absent rotation
- Tight contacts
- Occlusal plane ( corve of spee )

Question 9

Class l malocclusion

Answer 9

mesiobuccal cusp of upper 6 occlude in mesiobuccal groove of lower 6 .

Question 10

Class ll malocclusion

Answer 10

mesiobuccal cusp of upper 6 occlude mesially to mesiobuccal groove of lower 6 convex profile
retrognathic mandibular retruded

Question 11

Class ll division 1 malocclusion

Answer 11

mesiobuccal cusp of upper 6 occlude mesially to mesiobuccal groove of lower - proclination of upper incisors high overjet

Question 12

Class ll division 2 malocclusion

Answer 12

mesiobuccal cusp of upper 6 occlude mesially to mesiobuccal groove of lower 6 with retroclined upper central incisors and labially upper lateral incisors

Question 13

Class lll malocclusion

Answer 13

mesiobuccal cusp of upper 6 occlude distally to mesiobuccal groove of lower 6 - concave profile prognathic profile cross bite

Question 14

Pseudo class lll malocclusion

Answer 14

forward movement of the mandible during jaw closure

Question 15

Stage lll union stage

Answer 15

DP3u , PP3u , Mp3u , Ru , S2 appear clearly at this age the treatment is not suitable

Question 16

Stage ll cap stage F = 9-10 M = 10-12

Answer 16

MP3 cap

Question 17

Stage l equal stage F = up to 8 y M = up to 9 y

Answer 17

PP2 , MP3 ( equal line ) , S1 ( is best time for growth modification 8 - 9 end of stage l and start stage ll