Eruption sequence



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ERUPTION SEQUENCE –
Mandibular teeth generally precede maxillary teeth from anterior to posterior except for canines
Deciduous Teeth – Eruption Sequence –

Mn Central Incisors – 6.5 months

Mn Lateral Incisors – 7 months

Mx Central Incisors – 7.5 months

Mx Lateral Incisors – 8 months

1st Molars – 12-16 months

Canines – 16-20 months

2nd Molars – 20-30 months


Deciduous Dentition complete at 2 ½ years of age
Permanent Teeth – Eruption Sequence –

1st Molars – 6-7 years

Mn Central Incisors – 6-7 years

Mn Lateral Incisors – 7-8 years

Mx Central Incisors – 7-8 years

Mx Lateral Incisors – 8-9 years

Mn Canines – 9-10 years

Mx 1st Premolars – 10-11 years


Mn 1st Premolars – 10-12 years

Mx 2nd Premolars – 10-12 years

Mn 2nd Premolars – 11-12 years

Mx Canines – 11-12 years (often erupt to facial because of timing & available space)

Mn 2nd Molars – 11-13 years

Mx 2nd Molars – 12-13 years

3rd Molars – 17-21 years
Page 8 in lecture notes

ABBREVIATIONS AND DEFINITIONS –

INCISORS – CLASS TRAITS –

Incisal 2/3 of crown appears flattened

Compressed Labio-lingually

Results in a horizontal biting edge

Incisal ridge compared to cusp of canine or cusps of posterior teeth

Mamelons – rounded protuberances on Incisal ridge of newly erupted incisor

Distribution, number and size may vary

Position and angulation of marginal ridges

Incisors –

Mesial and distal termination of lingual surfaces

More parallel to long axis of tooth

Posterior teeth –

On occlusal surfaces

At right angle to long axis of tooth

Lingual Fossa and Cingulum –

Canines – Lingual ridges create two fossa

Posteriors – Two or more fossa on occlusal surface

From facial crowns are trapezoidal: longer I-C than M-D and taper from contact to cervical line

From facial crown outlines on distal are more convex than on mesial (except Mn Central)

From facial M-I angles are more acute than D-I angles

From Incisal view facial outlines are less convex than lingual outlines
MAXILLARY INCISORS – ARCH TRAITS –

Wider than corresponding mandibular incisors

Central incisor wider than lateral incisor

Marginal ridges and cinguli relatively more prominent than on Mn incisors

Lingual fossa deeper than on Mn incisors

Roots rounded or triangular in cross-section with equal labio-lingual and medio-distal widths

Facial surfaces more rounded as viewed from Incisal aspect

Crown wider mesio-distally than labio-lingually


MAXILLARY INCISORS – TYPE TRAITS –


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