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Flashcards in Development of the Occlusion Deck (15)
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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.


What are gum pads

The structures that represent dental arches at birth


Which gum pad is wider and longer

Upper gum pad


What do the segmented elevations in gum pads represent

Unerupted teeth


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

Lower central incisors
6-12 months


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

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


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



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

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


What is the leeway space

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


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

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


What guides the permanent molars into place

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


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


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

The mid-buccal groove of the mandibular first molar


What does the lower incisal edge occlude with

The cingulum plateau of the upper incisors


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