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Primary Incisors

 

Maxillary incisors

Mandibular incisors

     

Labial surface

smoothe

May have shallow depressions

Cingulum

Located 1/3rd occlusal cervically

Same

Lingual fossa

Incisal & middle 3rd.

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 3rd 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 3rd.

Same

     

 

Primary Canines

 

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 3rd. Mesial slightly cervical to distal. Similar to Permanent Mand. 1st 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 3rd.

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)

   

 

Primary Molars

Notes:

2nd large than 1st

Few grooves & depressions

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

2nd molars resemble permanent 1st.

Root spread beyond crown oultine

Maxillary have 3 roots, mandibular have 2.

1st 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

Primary 2nd Molars

 

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 1st permanent molars will need sealants also.

Primary 1st Molar

 

Maxillary

Mandibular

Cusp Size/shape

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

MB largest and longest (2/3rd 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.