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Orthodontics 2 > Development Of Occlusion > Flashcards

Development Of Occlusion Flashcards

1
Q

It is the changing interrelationship of the opposing surfaces of the maxillary and mandibular teeth ehich occur during movements of the terminal full contact of the maxilla and mandibular arches

A

Occlusion

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2
Q

The term occlusion is derived from what Latin word?

A

occlusio

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3
Q

Ideal occlusion is the result of developmental process consists of 3 main event, what are those?

A

Jaw growth
Tooth formation
Tooth eruption

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4
Q

What are the stage of development of occlusion?

A

pre-dentate period
Deciduous dentition period
Mixed dentition period
Permanent dentition period

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5
Q

Mixed dentition period is further subdivided into 3 , what are those?

A

1st transition period
Intertransition period
2nd transition period

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6
Q

It refers to the period from birth to the eruption of first deciduous tooth in the oral cavity

A

Pre-dental/dentate period

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7
Q

True or False

A delay in eruption of first deciduous teeth by 4-10 months is considered normal

A

True

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8
Q

It is horse shoe shape and extends labially and bucally

A

Maxillary gum pad

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9
Q

The maxillary gum pad develops into 2 part, what are those?

A

Labio-buccal

Lingual

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10
Q

It is U shaped and are anteriorly everted

A

Mandibular gum pads

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11
Q

What are the parts of the maxillary gum pad?

A 
Gingival groove
Dental groove
Transverse groove
Lateral sulcus
Incisive papilla
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12
Q

It separates the gum pads from the palate

A

Gingival groove

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13
Q

It extends from the incisive papilla, backwards to touch the gingival groove in the canine region and continues forward in the molar region

A

Dental groove

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14
Q

These are depression between the 10 segments of the gum pads

A

Transverse grooves

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15
Q

These are transverse grooves between the canine and molar sac region

A

Lateral sulcus

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16
Q

What are the oarts of mandibular gum pads?

A

Dental groove, gingival groove, transverse groove, lateral sulcus

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17
Q

What is the difference between max and man gum pads?

A

10 segments in mandibular gum pads are less demarcated compared to the max gum pads

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18
Q

It demarcates the lingual extent

A

Gingival groove

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19
Q

It runs backward, and laterally in the canine region

A

Dental groove

20
Q

Between max and man gum pads which is wider?

A

Maxillary gum pads

21
Q

The length of gum pads usually increases where?

A

Posterior direction

22
Q

What deciduous tooth is the first to erupt?

A

Mandibular central incisors

23
Q

At what ages does deciduous central incisors erupt?

A

8 months (6-10 mo)

24
Q

Age of eruption - lateral incisors

A

13 ( 10-16 months)

25
Q

Age of eruption - canine

A

20 ( 17-21 months)

26
Q

Age of eruption - 1st molar

A

16 ( 14-18 mos)

27
Q

Age of eruption - 2nd molar

A

27 mos

28
Q

What are the features of deciduous dentition?

A 
Spacing
Terminal plane relation of deciduous dentition
Deep bite
Dental arches - wide U-Shape
Flat curve of spee
Shallow cuspal interdigitation
Vertically placed incisors
29
Q

Period where permanent mandibular 1st molar erupts

A

1st transitional stage

30
Q

It guides permanent 1st molar into the arch

A

Deciduous 2nd molar

31
Q

It determines the permanent molar relation as it erupts into occlusion

A

Deciduous 2nd molar

32
Q

If the 2nd deciduous molars are in a flush terminal relation, what would be the relation of permanent 1st molar?

A

Class I

33
Q

The mandibular molar moves __ to ____ mesially relative to the upper molar and it utilizes the primate space and the forward growth of the mandible

A

3-5 mm

34
Q

It happens when eruptive forces of permanent 1st molar push deciduous 1st and 2nd molar forward

A

Early mesial shift

35
Q

If there is a lack in primate space, the 2nd deciduous molar must exfoliate

A

Late mesial shift

36
Q

Exchange of lower incisors takes place. The difference between the amount of space needed for the accommodation of incisors

A

Incisal liability

37
Q

Incisal liability in upper arch is ____

A

7mm

38
Q

Incisal liability in mandibular arch

A

5mm

39
Q

How to overcome incisal liability?

A
  1. Utilization of the interdental spacing seen in primary dentition
  2. Increase in intercanine width
  3. Change in incisor inclination
40
Q

What period is it when deciduous canine and molars are between permanent incisors and molar?

A

Inter-transitional period

41
Q

This is the phase of mixed dentition where there are no changes happens

A

Inter-transitional period

42
Q

This is the period where the deciduous molars and canines are replaced by permanent premolars and canine respectively

A

2nd transitional period

43
Q

It is the combined mesiodistal width of permanent canines and premolars and is usually less than that of deciduous canines and molars

A

Leeway space of Nance

44
Q

It is a self correcting malocclusion that is seen in maxillary incisor region between 8-9 y/o

A

Ugly duckling stage

45
Q

Who described the ugly duckling stage

A

Broadbent

Also known as Broadbent phenomenon

Orthodontics 2 (3 decks)

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