OHS Primary Teeth

Primary Maxillary Central Incisor

-Eruption: 10 (8-12 months)

-Shedding Range: 6-7 years

-constricts more at CEJ than the permanent

-lingual surface has defined anatomy

-mesial and distal outlines more rounded

-wider mesiodistally than incisocervically

Primary Maxillary Lateral Incisor

-Eruption: 11 (9-13 months)

-Shedding Range: 7-8 years

-smaller in all dimensions than central

-root is similar but longer

-incisal edges more rounded

-lingual surfaces less distinctive

-cervical constrictions greater

-longer crown incisocervically than mesiodistally

Primary Maxillary Canine

-Eruption: 19 (16-22 months)

-Shedding Range: 10-12 years

-mesial slope is much longer

-mesial and distal outlines are rounded

-lingual ridge extends from cingulum to the top of the cusps → 2 fossas

-longer, sharper cusp

-crown is diamond shaped

-cingulum is well developed (more rounded)

-root is twice as long as its crown

Primary Manidbular Central Incisor

-Eruption: 8 (6-10 months)

-Shedding Range: 6-7 years

-very symmetrical

-facial view more flat

-not as constricted at the CEJ than Max Central

-lingual is smooth with prominent cingulum

-tooth is wider labiolingually

-crown looks more like primary mandibular lateral incisor

Primary Mandibular Lateral Incisor

-Eruption: 13 (10-16 months)

-Shedding Range: 7-8 years

-incisal edge slopes distally

-wider and longer crown than central

-longer roots and distal curvature

-cingulum is more developed, lingual fossa is deeper

-cingulum offset to distal like the permanent

-distal groove

Primary Mandibular Canine

-Eruption: 20 (17-23 months)

-Shedding Range: 9-12 years

- the crown resembles the max canine

-distal cusp slope is longer

-the root is longer and more narrow

-incisal edge is straight and centered over the crown

-lingual surface is smoother

Primary Maxillary First Molar

-Eruption: 16 (13-19 months for males, 14-19 months for females)

-Shedding Range: 9-11 years

-most variation/most atypical of maxillary molars

-M.D outlines more rounded

-constricted at CEJ

-2 majors cusps MB and ML

-short root trunk

-roots are thinner and more flared than permanent

-lingual root is longer and most divergent

Primary Maxillary Second Molar

-Eruption: 29 (25-33 months)

-Shedding Range: 10-12 years

-cusp of carabelli

-root trunk is short

-resembles the form of the Permanent Max First Molar

-larger than primary max first molar

-DB root is the shortest, MB may be as long as the lingual root/flared

Primary Mandibular First Molar

-Eruption: 16 (14-18 months)

-Shedding Range: 9-11 years

-tooth varies so much→ it appears strange and primitive

-mesial half of crown is much larger than the distal

-extreme concavity (rounded) on the mesial buccal and cervical 1/3

-2 roots: mesial and distal

Primary Mandibular Second Molar

-Eruption: 27 (23-31 months for males, 24-30 months for females)

-Shedding Range: 10-12 years

-most closely resembles the Permanent Mandibular 1st Molar

-3 buccal cusps are nearly equal in length, 2 lingual cusps

-2 roots

-larger than primary mandibular first molar

-oval occlusal shape