Maxillary incisors

Mandibular incisors

Labial surface

smoothe

May have shallow depressions

Cingulum

Located 1/3^rd occlusal cervically

Same

Lingual fossa

Incisal & middle 3^rd.

Slight in same location.

Marginal ridges

More distinct on centrals.

Faint

Taper

To the lingual

Same

Crown

Centrals wider than they are tall.

Laterals slightly larger than centrals.

contacts

Comparable to permanents

Same

Incisla angles

Central has rounding of distoincisal angle. D.I. angle on laterals even more rounded.

Cervical ridge

Prominent

Same

CEJ

Curves incisally more on the mesial. Lingual CEJ positioned more apical than facial.

Same

Root Shape

S-shaped. Bend lingually in cervical 3^rd to half and then labially in the apical 1/2th.

Straight in the cervical half and bend labially in the apical half.

Incisal edge

1.0 mm for central. Labial to long axis otf tooth

Incisal view

Taper to lingual. Centrals wider M.D. than F.L. Laterals are same but not as pronounced.

M.D. = F.L. dimension.

Root:crown

Root longer

Same.

Height of contour (Cervical buldge)

Cervial 3^rd.

Same

Maxillary

Mandibular

Lingual Ridge

Distal to middle of crown

Barely discernible

Cingulum

Prominent. More so than permanent canines.

Same

Lingual fossa

May see. Distal fossa narrower and deeper than mesial.

Marginal ridges

Prominent. More so than permanent canines

Same

Taper

Crown

Wide as tall

Longer incisocervically than M.D. 1.3 mm narrower M.D. than maxillary.

Contacts

Distal: Middle 3^rd. Mesial slightly cervical to distal. Similar to Permanent Mand. 1^st premolar.

Same

Cusp Ridge

Mesial longer than distal. Usually sharp and acute.

Distal longer than mesial.

Cervical ridge

Much thicker than incisors.

Same.

CEJ

Curve more mesially & more apical on lingual than facial.

Same

Root Shape

Longest of primary teeth. Bend labially in apical 3^rd.

2mm shorter than maxillary. Bend same as maxillary.

Cusp Tip

Labial to root axis.

Lingual to root axis.

Proxoimal view

More S-shaped w/ concavity than permanent canines.

Same.

Incisal View

Angular. Mesial half thicker than distal half F.L.

Symmetrical diamond shaped. Slightly greater bulk distally.

Height of contour (Cervical buldge)

2^nd large than 1^st

Few grooves & depressions

2^nd molar roots spread more than 1^st. Opposite true in permanent molars.

2^nd molars resemble permanent 1^st.

Root spread beyond crown oultine

Maxillary have 3 roots, mandibular have 2.

1^st molrs are unique in shape.

Crowns have narrow chewing surface

Mesial cervial ridge prominent

Occlusal anatomy shallow

Furcations near crown

Buccal cusp tips not pointy (obtuse)

Enamel rods slope at cervix occlusally

Maxillary

Mandibular

Crown

Taper to occlusal

Cusp size

MB = or larger than ML

3 buccal cusp = in size. DB is widest (largest).

Roots

3.

2. More slender and widely spread.

Mesial cerivcal ridge

More prominent

Notes: If these needs sealants than 1^st permanent molars will need sealants also.

Maxillary

Mandibular

Cusp Size/shape

Distinct ML & MB. Indistinct DB & DL. No buccal groove

MB largest and longest (2/3^rd the surface). Compressed B.L. Small DB cusp.

Occlusal outline

Crown oblong. Wider F.L. than M.D. by 1.4 mm. Rotated 90 degrees. Rectangle in shape.

Oval shape. Wider M.D. than F.L.

Occlusal anatomy

H-shape groove pattern. T.R. on DB cusp becomes distal marginal ridge on 3-cusp version. On 4-cusp version, DB T.R. joins T.R. of ML.

Crown Proportion

Wider M.D. than high. Taper to distal.

Roots

Mesial longer than distal

Marginal ridges

Possess grooves. Mesial looks like a cusp and is more occlusal than distal. Distal is short and less pronounced. Mesial aspect flat, distal is rounded.

Occlusal table

Small B.L.

Same

Tilt

None

Lingually.

Fossa

Large distal fossa extending almost to centerof table. Has mesial trianglular fossa and pit.