______ incisors approximate the midline

______ incisors are second fromt the midline

central

lateral

cut food

articulate speech

support lips (esthetics)

guide mandible during movement

For maxillary central incisors and maxillary lateral incisors:

First evidence of calcification

Enamel completed

Eruption

Root completed

• 1st evidence of calcification: Central (3-4 months) Lateral (3-4 months)
• Enamel completed: Central (4-5 years) Lateral (4-5 years)
• Eruption: Central (7-8 years) Lateral (8-9 years)
• Root completed: Central (10 years) Lateral (11 years)

Maxillary central incisor Labial view:

• _____ shaped
• Distal outline more ____ than mesial outline
• Mesial is relatively ____, while distal is more ___
• M and D height of contour = ____ third

• Trapezoidal
• convex
• straight, convex
• incisal

Maxillary central incisor labial view:

• Mesial contact is more ____ than distal contact area
• Mesio-incisal corner is _____, that disto-incisal corner

• incisal
• sharper (closer to 90 degrees)

Maxillary central incisor labial view

• CEJ curves ____
• Facial surface is slightly ____ M-D
• Facial is ____ I-Gi; greatest convexity is in the ____ third
• Incisal edge is basically ______ to the long axis of the tooth

• apically
• convex
• convex; gingival
• perpendicular

Maxillary central incisor

Begins as incisal ridge and with wear becomes flatter and turns into _____

3

2

middle

Mesiolabial developmental depression

Distolabial developmental depression

What are convexities/very small elevations;

very small wave-like ripplese of enamel on newly erupted permanent teeth

Maxillary central incisor lingual view

• ____ shaped
• Lingual ___ (depression)
• _____- v shaped ridge
• M-D width of lingual is more ____ than the facial M-D width

• Trapezoidal
• Fossa
• Cingulum
• narrow

Maxillary central incisor lingual view

• Mesial and distal outlines are more narrow at ____ area (same for labial view)
• Mesical and distal marginal ridges converge toward the ____
• Lingual fossa is bounded by _____
• May have a "__" or "__" shape

• gingival
• cingulum
• 4 convexities
• W or M

one single root

straight

tapered

conical

rounded at the apex

Maxillary central incisor mesial view

• _____ shaped
• Incisal edge is ____ or slightly ___ to center Fa-Li
• Labial outline is ____
• Incisal third to half of facial slops to _____

• Triangular
• centered or slightly facial
• convex
• lingual

Maxillary central incisor mesial view

• Lingual outline is "__" shaped
• CEJ curves to ____
• Contact area: _____ and  _____ faciolingually

• S
• incisal
• incisal 1/3 and centered faciolingually

• Incisogingivally, the crown is shorter and is smaller labiolingualy
• Facial is more convex in both directions (I-Gi and M-D)
• More of the labial (La) surface is visible when viewed from distal - than when viewed from mesial
• CEJ has less convexity
• Contact area: more cervical than on mesial (still in the incisal third)

Maxillary central incisor incisal view

• _____ shaped
• La and Li are both ____
• Is cingulum centered or offset (direction?)
• On facial: more convexity on ____ third than ___ third

• Triangular
• convex
• offset to distal
• distal third than mesial third

Maxillary lateral incisor labial view

• Mesial margin: height of contour is in ____ third
• Distal outline is more ___ than mesial outline
• Labial surface: more ___; ____ M/D than the central incisor
• Incisal corners are more ____ than on central incisors

• incisal third
• rounded
• convex; narrower
• rounded

Maxillary lateral incisor labial view

• Root is ____ proprtionately to the crown than central incisor root and crown
• Root curves to the ___
• The lateral facial is somewhat ____ shaped while central facial is more ____ shaped

• longer
• distal
• rectangular; square

How is the maxillary lateral incisor lingual view different from the central?

What is the deep developmental groove which extends apically along the root?

• Prominent cingulum
• prominent marginal ridges
• lingual fossa: deeper; more defined

• linguogingival fissure

Maxillary lateral incisor distal view

• ____ labiolingually than in mesial view
• How is CEJ different distally than mesially?

• Wider
• CEJ not as deeply curved as mesial

• Large cingulum proportionally
• Labial is convex
• Lingual is convex

What are way in distinguishing right from left in maxillary incisors?

• Both: the distal is more convex than the mesial
• Lateral: the root commonly curves to the distal

• The relative shape (square=central or rectangle=lateral)
• Lateral: root is more slender and longer compared to its crown
• Max lateral is often confused with mandibular cuspid (1 difference is how the crown relates to the root of these 2 teeth)