Ortho labs

Question 1

What are the 2 components of IOTN?

Answer 1

The aesthetic component (AC)
The dental health component (DHC)

Question 2

What is IOTN?

Answer 2

Index of Orthodontic Treatment Need
Rating system that was developed to assist in determining the potential impact of a malocclusion on an individual’s dental health and their psychosocial well-being

Question 3

What are the aesthetic component grades that require no treatment?

Answer 3

Grade 1,2,3,4

Question 4

What are the aesthetic component grades that require moderate/borderline need for treatment?

Answer 4

Grade 5,6,7

Question 5

What are the aesthetic component grades that require orthodontic treatment?

Answer 5

Grade 8,9,10

Question 6

How does the Dental Health Component (DHC) work?

Answer 6

Divided into 5 grades
–only the worst occlusal feature is recorded
It is non accumulative
–these scores are not added together
Hierarchical scale
–higher up the scale, the more severe the malocclusion

Question 7

What does the acronym MOCDO stand for?

Answer 7

M
–missing teeth (including congenital absence, ectopic and impacted teeth)
O
–overjets (including reverse overjets)
C
–Crossbites
D
–Displacements of contact points
O
–overbites (including open bites)

Question 8

When is there an anterior crossbite present?

Answer 8

1 to 3 incisors are in lingual occlusion

Question 9

When is there a posterior crossbite?

Answer 9

Cusp to cusp or in full crossbite

Question 10

What is the ligature?

Answer 10

The archwire is held to each bracket with a ligature, which can be either a tiny elastic or a twisted wire

Question 11

What is the archwire?

Answer 11

The archwire is tied to all of the brackets and creates force to move teeth into proper alignment

Question 12

What are the brackets?

Answer 12

Brackets are connected to the bands or directly bonded on the teeth and hold the archwire in place

Question 13

What is the metal band?

Answer 13

The band is the cemented ring of metal which wraps around the tooth

Question 14

What are the elastic hooks & rubber bands?

Answer 14

Elastic hooks are used for the attachment of rubber bands, which help move teeth toward their final position

Question 15

What are the uses of a transpalatal arch?

Answer 15

Anchorage
Rotation
Limited widening or contraction

Question 16

What are the uses of a palatal arch with a nance button?

Answer 16

Anchorage

Question 17

What are the uses of a quadhelix?

Answer 17

Bilateral expansion
Asymmetrical expansion
Fan style expansion
Rotation of molars
Expansion in cleft palate
Modified to procline incisors
Assist in habit breaking

Question 18

What are the advantages of fixed orthodontics?

Answer 18

Bodily tooth movement
Rotations easily fixed
Can be used as easily in the lower arch as well as the upper
Individual force can be applied to every tooth
Not easily removed by the patient
Works 24/7
Precise 3D movement of teeth
Less invasive of tongue space
Minimal palatal coverage

Question 19

What are the disadvantages of fixed orthodontics?

Answer 19

Increased risk of root resorption
Decalcification
Can be perceived as visually unattractive
Can cause soft tissue trauma
Cost
High motivation in regards to oral hygiene needed
Poor anchorage
Highly trained specialist training
Etching teeth is a destructive process

Question 20

What are the advantages of removable orthodontics?

Answer 20

Tipping of teeth
Excellent anchorage
Generally cheaper than fixed
Shortened chairside time required
Oral hygiene is easier to maintain
Non-destructive to tooth surface
Less specialised training required to manage
Can be easily adapted for overbite reduction
Can achieve block movements

Question 21

What are the disadvantages of removeable orthodontics?

Answer 21

Less precise control of tooth movement
Can be easily removed by the patient
Generally only 1-2 teeth can be moved at one time Specialist technical staff required to construct the appliances
Rotations very difficult to correct