W7 - Self-correcting Anomalies in Growing Dentition - Mani

Question 1

Synonym for Self-correcting anomalies? Do they require tx?

Answer 1

Transient malocclusion

• Do not require tx

Question 2

How does the jaw appear from birth to eruption of 1st deciduous teeth?

Answer 2

Retrognathic mandible

• Upper gum pad protrudes about 5 mm

Question 3

Causes of retrognathic mandible (3)

self-correcting anomaly

Answer 3

Growth magnitude and duration greater in anterior mx than anterior md

Upper anterior gum pad > lower anterior gum pad

Md does most its growth post-natally rather than pre-natally

Question 4

When and how does retrognathic md correct itself?

SCA

Answer 4

6-7 months

• By downward and forward growth of the mandible

Question 5

Features of SCA anterior open bite (3)

Answer 5

Upper and lower gum pads only contact at molar region

• Helps with suckling
• Considered normal
• Corrects at 6-7 months

Question 6

When and how does SCA anterior open bite correct itself

Answer 6

6-7 months

• eruption of primary incisors

Question 7

Self correcting anomalies of the predental period (3)

Answer 7

Anterior open bite

Retrognathic mandible

Infantile swallowing

Question 8

Self correcting anomalies of the primary dentition (4)

Answer 8

All normal from 6mo - 3 years

Anterior deep bite

Flush terminal plane

Edge to edge bite

Spacing

Question 9

is a LACK of space in primary dentition normal?

Answer 9

NO - indicates crowding in coming permanent dentition

Question 10

Causes of anterior deep bite (3)

SCA

Answer 10

• Primary teeth more upright than successors
• More vertical inclination (150 degree inter-incisal angle)
• Infra occlusion of partially erupted molars

Question 11

How does anterior deep bite correct itself (3)

SCA

Answer 11

Complete eruption of primary molars (increases VDO)

Attrition of incisal edges

Forward and downward growth of mandible

Question 12

EXAM NOTE

Answer 12

Pictures may be shown of early dentition and ask or treatment → may just require observation as it is a self-correcting anomaly

Question 13

3 types of spacing in the primary dentition

Answer 13

Primate spaces

Developmental / physiological spaces

Leeway

Question 14

How does spacing correct itself in the primary dentition (2)

Answer 14

Eruption of perm

Eruption of first permanent molar (early mesial shift)

Question 15

Why is leeway space important

Answer 15

Helps in establishing class 1 occlusion

(in addition to differential jaw growth)

Question 16

How is edge to edge bite self corrected?

Answer 16

Eruption of permanent incisors

More labial inclination (inter-incisal inclined 123 degrees)

Question 17

When does anterior deep bite need to be corrected?

Answer 17

Approx 10 years old

if earlier, do not correct → normal malocclusion

This is due to erption of large permanent incisors

Question 18

How does anterior deep bite self correct?

Answer 18

By complete eruption of primary molars - increases the vertical dimension

Question 19

What is the ugly-duckling stage aka Broadbent phenomenon?

Answer 19

Seen at 8-11 years old

Difference in dimension of primary and permanent teeth

front teeth look big bc theyre permanent

Midline diastema due to growing canines applying pressure onto the converging incisors roots

Question 20

My childs smile is wack, big teeth, spacing. Fix it

Answer 20

Don’t touch - this is normal appearance and malocclusion

Ugly duckling phenomenon / Broadbent

Midline diastema due to erupting canines

Smile will correct itself once mx permanent canine erupts

Question 21

Why does midline diastema form (9-10 years old)

Answer 21

Growing / erupting canines putting pressure on incisor roots

• Causes them to diverge

Question 22

Self-correcting anomalies of the permanent dentition

Answer 22

not many

Increased overjet / overbite - however will not be corrected more than 1 mm by 20 years old

Question 23

How to answer ortho based questions

Answer 23

Regardless of malocclusion

consider the age first

Question 24

note**

Answer 24

Need to know the following for conditions (epillepsy, downs)

Oral manifestations of the actual condition

Oral manifestation as a result of medication

Question 25

Consideration for bleeding and pulpotomies

Answer 25

Use cotton pellet to control bleeding

If bleeding doesnt stop in 3-5 min, proceed to pulpectomy

Question 26

Does predental retrognathic mandible indicate future malocclusion?

Answer 26

Not necessarily - this is normal transient malocclusion

Question 27

What is infantile swallowing and how is it different to mature swallowing

Answer 27

Self correcting anomaly

carried out by stomatognathic system

• Jaws apart, tongue placed btw upper and lower gum pads
• Nipple drawn into mouth
• Milk is directed into pharynx
• Swallow is guided and controlled as a sensory interchange between lips and tongue

Question 28

How is infantile swallowing self corrected? (2)

Answer 28

• Gradually disappears with eruption of teeth and as infant starts to eat solid food (approx 1 year)
• When tongue is contained within dental arch

Question 29

When does infantile swallowing correct itself (years)

Answer 29

around 1 year

• baby starts to eat solid food and have teeth erupt

Question 30

Child has a deep over bite at 2 years old. Tx?

Answer 30

None - this is a self correcting anomaly

Question 31

When is your primary dentition in place?

Answer 31

6 months to 3 years

Question 32

Early vs late mesial shift

Answer 32

Early - using primate spaces

Late - using leeway spaces

Question 33

What causes mandibular anterior crowding?

SCA

Answer 33

Larger permanent md anteriors erupting in a still narrow arch

Question 34

How is mandibular anterior crowding self corrected?

Answer 34

Jaw expansion/growth → increased inter-canine width

Tongue pressure → forward migration of md ants

Question 35

How does minor crowding differ from moderate crowding resolvement in the md anterior region?

SCA

Answer 35

Minor → resolves spontaneously by development

Moderate → Use of leeway space

May consider lingual arch to prevent mesial movement of permanent molar

Question 36

what is “End on” relationship?

Answer 36

Buccal cusp tip of perm mx 6 coincides with buccal cusp tip of perm md 6

Question 37

What is this and how does it self correct? (2)

Answer 37

“End on relationship”

Corrected by:

1. Eruptive force in mesial direction of perm mandibular molars
2. Late shift in non-spaced dentition

75% will shift into class 1 without treatment

25% will shift into class 2

Question 38

How is minor overbite and overjet self corrected in the permanent dentition

Answer 38

By eruption of all permanent molars

Differential growth of mandible

Overbite will be decreased up to 0.5 mm by 18

Overjet will be decreased up to 0.7 mm by 20