Development of the Occlusion Flashcards Preview

Oral Biology (Oral Cavity) > Development of the Occlusion > Flashcards

Flashcards in Development of the Occlusion Deck (15)
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1
Q

What is normal occlusion

A

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

2
Q

What are gum pads

A

The structures that represent dental arches at birth

3
Q

Which gum pad is wider and longer

A

Upper gum pad

4
Q

What do the segmented elevations in gum pads represent

A

Unerupted teeth

5
Q

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

A

Lower central incisors

6-12 months

6
Q

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

A

The first molars

6years ish, +/- 12 months

7
Q

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

A

Palatally

8
Q

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

A
  • Pre-existing spacing
  • Proclination
  • Growth (increased inter-canine width)
9
Q

What is the leeway space

A

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

10
Q

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

A
  • Lower arch: 2mm per quadrant

- Upper arch: 1mm per quadrant.

11
Q

What guides the permanent molars into place

A

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

12
Q

What allows the permanent molars into class 1 relations

A

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

13
Q

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

A

The mid-buccal groove of the mandibular first molar

14
Q

What does the lower incisal edge occlude with

A

The cingulum plateau of the upper incisors

15
Q

What teeth provide anterior and canine guidance

A

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