Maxillary lateral incisors

Maxillary lateral incisors - universal numbers

 #7 and #10

Maxillary lateral incisors - succedaneous or nonsuccedaneous?

Succedaneous 

• Predecessor of #7 is D 

• Predecessor of #10 is G

Maxillary lateral incisors

• 2nd from the midline 

• Mesial contacts with centrals

• Distal contact with canines 

• Resembles maxillary central but smaller

• Relatively narrower mesidistally 

• Features, curvatures, concavities, and convexities more prominent and more distinct than maxillary central 

Development table

• Initiation of calcification : 1 year

• Eruption : 8-9 years

• Completion of root : 11 years

Mesial outline  (labial view)

Mesioincisal angle is SHARP 

Distal outline (labial view)

• *MORE ROUNDED than distal of central 

• Distoincisal angle is more rounded

 Incisal (labial view)

• May exhibit mamelons 

• More rounded incisal angles than a maxillary central 

Cervical margin (CEJ)  (labial view)

• Curved slightly toward root 

  • Less curve than central 

Developmental depressions & imbrication lines (labial view)

sometimes present

Height of contour at the… (labial view)

cervical third (gingival third)

Mesial outline  (lingual view)

• Meets the incisal ridge at a right angle 

• Mesioincisal angle is SHARP

Distal outline (lingual view)

• Distoincisal angle is much more rounded than mesioincisal angle 

Incisal (lingual view)

• May exhibit mamelons 

• More rounded incisal angles than a maxillary central 

Cervical margin (lingual view)

CEJ curves toward apical

Mesial & distal marginal ridges and cingulum are more… (lingual view)

prominent than central

Cingulum is… (lingual view)

centred

Lingual fossa is… (lingual view)

deeper than central 

Lingual pit is… (lingual view)

more common than on centrals 

• Pit is potential site for caries 

Linguogingival groove (lingual view)

• Starts in lingual pit 

*Extends distally onto cingulum

Height of contour at… (lingual view)

greatest curvature of cingulum in cervical third 

Mesial Surface 

*CEJ is deeper on the mesial 

Distal Surface 

CEJ is not as deep as mesial 

Incisal Aspect 

• Resembles max. Central with more prominent cingulum 

• Incisal ridge is present 

• More convex labially and lingually than central 

Incisal aspect shape

*Outline appears rhomboidal 

Root

• Single

• Conical root in shape 

• Root may curve towards the distal

• *Sharp apex

Variations in form may present challenges in

instrumentation and assisting patient in maintaining good oral hygiene 

Clinical considerations - Dilaceration

(distorted sharp bend) in crowns and unusual root curvatures more common than any other incisor 

Talon’s Cusp 

Incisal portion of cingulum may exhibit a tubercle (accessory cusp) on the cingulum

Permanent tooth most likely to exhibit microdontia

Mini version of the tooth but has all the features

Linguogingival groove may accumulate…

deposits and may extend all the way onto root surface 

• Peg lateral 

• Bilateral or unilateral 

• Relatively common 

• Lack of development of mesial and distal lobes/ portions of crown

  • Just has labial (lingual) and cingulum  

Congenitally missing

tooth bud does not form

• Ask patient 

Dens in Dente

More common in lateral incisors because of the lingual pit

• Appears as tooth within a tooth, dentin and enamel mix in development 

Chart

look at it