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Flashcards in Development of the Occlusion Deck (15)
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1

What is normal occlusion

An occlusion that satisfies the requirements of function and aesthetics but in which there may be minor irregularities of individual teeth.

2

What are gum pads

The structures that represent dental arches at birth

3

Which gum pad is wider and longer

Upper gum pad

4

What do the segmented elevations in gum pads represent

Unerupted teeth

5

What and when are the first teeth of the deciduous dentition erupted

Lower central incisors
6-12 months

6

What and when are usually the first permanent teeth to erupt in the mixed dentition

The first molars
6years ish, +/- 12 months

7

Do the permanent incisors erupt labially or palatally to the deciduous incisors

Palatally

8

How is the increased width of the erupting permanent incisors accommodated for

- Pre-existing spacing
- Proclination
- Growth (increased inter-canine width)

9

What is the leeway space

The difference between the combined mesio-distal widths of c, d & e compared to 3, 4 & 5

10

What is the usual leeway space of the lower and upper arches

- Lower arch: 2mm per quadrant
- Upper arch: 1mm per quadrant.

11

What guides the permanent molars into place

The terminal plane formed by the E's, currently into class 2 relations

12

What allows the permanent molars into class 1 relations

After the loss of the E's the greater leeway space results in the first molars drifting forwards into class 1 relation

13

What does the mesio-buccal cusp of the 1st maxillary molar occlude with

The mid-buccal groove of the mandibular first molar

14

What does the lower incisal edge occlude with

The cingulum plateau of the upper incisors

15

What teeth provide anterior and canine guidance

Incisors provide anterior guidance in protrusion with the disclusion of posterior teeth
Canines = canine guidance in lateral excursion and ensures no interferences on the non-working side