Orthodontic Assessment

Question 1

At what age should a child be orthodontically assessed

Answer 1

• briefly at age 9
• comprehensive assessment when premolars and canines erupt

Question 2

What habits can impact occlusion?

Answer 2

• thumb sucking
• lower lip sucking
• tongue thrust
• chewing finger nails

Question 3

What special investigations can be undertaken following an orthodontic assessment?

Answer 3

• OPT
• Vitality tests
• Study models
• Photographs

Question 4

What is orthodontics?

Answer 4

Dentistry specialty concerned with:
- growth and development of teeth face and jaws
- diagnosis, prevention and correction of dental and facial abnormalities

Question 5

Common occlusal and dental abnormalities

Answer 5

crowding
spacing
increased overjet
reverse overjet
anterior open bite
deep bite
hyperdontia
supernumeraries

Question 6

Features of ideal occlusion

Answer 6

• hypothetical, rarely found in nature
• distal surface of disto-buccal cusp of upper first permanent molar occludes with mesial surface of mesio-buccal cusp of lower second permanent molar
• no rotations
• no spaces
• flat occlusal planes

Question 7

Normal occlusion - define

Answer 7

mild deviations from ideal occlusion
BUT
no functional or aesthetic problems

Question 8

malocclusion definition

Answer 8

more serious deviations from ideal occlusion with functional or aesthetic problems

Question 9

orthodontic assessment - aims

Answer 9

stable
functional
aesthetic occlusion
- prior to restorative work

Question 10

the facial skeletal pattern can be assessed in which planes?

Answer 10

• antero-posterior
• vertical
• transverse

Question 11

AP skeletal class 1 definition

Answer 11

maxilla 2-3 mmm in front of mandible

Question 12

What is meant by ‘incompetent lips’?

Answer 12

lips that do not meet at rest
- relaxed mentalis

Question 13

competent lips are..

Answer 13

lips that meet at rest

Question 14

Lip trap - consequences

Answer 14

• may proline upper incisors
• may lead to relapse of overjet if persists post treatment

Question 15

hyper active lower lip - consequences

Answer 15

• may retrocline lower incisors
• indicates instability at end of treatment

Question 16

Occlusal features of a sucking habit

Answer 16

• proclaimed upper incisors
• retroclined lower incisors
• localised anterior open bite
• narrow upper arch
• unilateral posterior cross bite

Question 17

Mandibular displacement

Answer 17

displacement of mandible up and to the right from RCP to ICP

Question 18

Orthodontic assessment - things to check for lower arch

Answer 18

• degree of crowding
• presence of rotations
• inclination of canines
• angulation of incisors to mandibular plane

Question 19

Orthodontic assessment - things to check for lower arch

Answer 19

• degree of crowding
• presence of rotations
• inclination of canines
• angulation of incisors to Frankfort plane

Question 20

Class 1 incisor relationship definition

Answer 20

lower incisors edges occlude with or lie immediately below the cingulum plateau of the upper central incisors

Question 21

class 2 incisor relationship

Answer 21

the lower incisor edges lie posterior to the cingulum plateau of the upper incisors

Question 22

class 2 div 1 incisor relationship - define

Answer 22

upper incisors are proclined or of average inclination and there is an increase in overjet

Question 23

class 2 div 2 incisor relationship - define

Answer 23

upper central incisors are retroclined
- overjet usually minimal or may be increased

Question 24

Class 3 incisor relationship - define

Answer 24

lower incisor edges lie anterior to the cingulum plateau of the upper incisors
- overjet reduced or reversed

Question 25

What score is used to assess the treatment need for a patient in orthodontics?

Answer 25

IOTN