Development Of Occlusion

Question 1

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

Answer 1

Occlusion

Question 2

The term occlusion is derived from what Latin word?

Answer 2

occlusio

Question 3

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

Answer 3

Jaw growth
Tooth formation
Tooth eruption

Question 4

What are the stage of development of occlusion?

Answer 4

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

Question 5

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

Answer 5

1st transition period
Intertransition period
2nd transition period

Question 6

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

Answer 6

Pre-dental/dentate period

Question 7

True or False

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

Answer 7

True

Question 8

It is horse shoe shape and extends labially and bucally

Answer 8

Maxillary gum pad

Question 9

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

Answer 9

Labio-buccal

Lingual

Question 10

It is U shaped and are anteriorly everted

Answer 10

Mandibular gum pads

Question 11

What are the parts of the maxillary gum pad?

Answer 11

Gingival groove
Dental groove
Transverse groove
Lateral sulcus
Incisive papilla

Question 12

It separates the gum pads from the palate

Answer 12

Gingival groove

Question 13

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

Answer 13

Dental groove

Question 14

These are depression between the 10 segments of the gum pads

Answer 14

Transverse grooves

Question 15

These are transverse grooves between the canine and molar sac region

Answer 15

Lateral sulcus

Question 16

What are the oarts of mandibular gum pads?

Answer 16

Dental groove, gingival groove, transverse groove, lateral sulcus

Question 17

What is the difference between max and man gum pads?

Answer 17

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

Question 18

It demarcates the lingual extent

Answer 18

Gingival groove

Question 19

It runs backward, and laterally in the canine region

Answer 19

Dental groove

Question 20

Between max and man gum pads which is wider?

Answer 20

Maxillary gum pads

Question 21

The length of gum pads usually increases where?

Answer 21

Posterior direction

Question 22

What deciduous tooth is the first to erupt?

Answer 22

Mandibular central incisors

Question 23

At what ages does deciduous central incisors erupt?

Answer 23

8 months (6-10 mo)

Question 24

Age of eruption - lateral incisors

Answer 24

13 ( 10-16 months)

Question 25

Age of eruption - canine

Answer 25

20 ( 17-21 months)

Question 26

Age of eruption - 1st molar

Answer 26

16 ( 14-18 mos)

Question 27

Age of eruption - 2nd molar

Answer 27

27 mos

Question 28

What are the features of deciduous dentition?

Answer 28

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

Question 29

Period where permanent mandibular 1st molar erupts

Answer 29

1st transitional stage

Question 30

It guides permanent 1st molar into the arch

Answer 30

Deciduous 2nd molar

Question 31

It determines the permanent molar relation as it erupts into occlusion

Answer 31

Deciduous 2nd molar

Question 32

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

Answer 32

Class I

Question 33

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

Answer 33

3-5 mm

Question 34

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

Answer 34

Early mesial shift

Question 35

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

Answer 35

Late mesial shift

Question 36

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

Answer 36

Incisal liability

Question 37

Incisal liability in upper arch is ____

Answer 37

7mm

Question 38

Incisal liability in mandibular arch

Answer 38

5mm

Question 39

How to overcome incisal liability?

Answer 39

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

Question 40

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

Answer 40

Inter-transitional period

Question 41

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

Answer 41

Inter-transitional period

Question 42

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

Answer 42

2nd transitional period

Question 43

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

Answer 43

Leeway space of Nance

Question 44

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

Answer 44

Ugly duckling stage

Question 45

Who described the ugly duckling stage

Answer 45

Broadbent Also known as Broadbent phenomenon