maxillary incisors

What are the function of incisors?

Cutting and biting food
Articulate speech
Support lips (esthetics)
Guide mandible during movement

What are the unworn labial lobes on newly erupted incisors?

mamelons

What is the lingual developmental lobe?

cingulum

Where is the height of contour for labial + lingual surfaces of incisors?

cervical third

How is the CEJ curvature of incisors compared to posterior teeth?

CEJ curvature is greater than that of the posterior teeth

What is the average crown length for central incisors?

10.5 mm

What is the average root length for central incisors?

13mm

When is the root completed for central incisors?

10 yrs

Which anterior teeth have the widest crown?

central incisors

How is the MI angle compared to the DI angle of central incisors?

MI is more acute/sharp
DI is more rounded

What is a common characteristic on the facial surface of central incisors?

imbrication lines

How can the root of central incisors be described?

single root
2-3mm longer than crown
1 large root canal
NO concavities or depression

How does the lingual surface of the central incisor differ from the facial surface?

lingual surface has concavities and is not smooth

What is found below the CEJ on the lingual side of central incisors?

cingulum

Which marginal ridge is longer on the lingual of central incisors?

mesial marginal ridge is longer than distal

What is the lingual fossa of the central incisors?

shallow + wide surface bordered by marginal ridges on the lingual side

Where would the lingual pit be located?

at the incisor border of the cingulum

Where does the CEJ have the largest curvature?

medial surface of max. central incisors

Why is the central incisor at risk for fracture?

- tooth is most anterior + labial
- early eruption

Avulsion

complete displacement of the tooth from the socket resulting from extensive trauma to the area

What open contact is common between central incisors?

diastema

What is common between two central incisors?

supernumerary

When is the lateral incisor completed?

11 yrs

What is unique about lateral incisors?

Greatest variation in form except 3rd molars

What is it called if the variation of lateral incisors is too great?

developmental anomaly

How would the crown of the lateral incisors be described?

narrower than central, ~22mm

How is the cingulum of lateral incisors compared to central?

lateral is smaller and more centered

How is the lingual side of the lateral compared to central?

lateral is more likely to exhibit lingual fossae + pits (PROMINENT LINGUAL SURFACE)

How is the distal marginal ridge of lateral incisors compared to mesial?

Distal marginal ridge of lateral appear shorter than mesial (more so than on centrals)

What are the characteristics of the CEJ of the lateral incisors?

- slightly less curved than centrals
- as on all anterior teeth, the mesial CEJ curves more than the distal

What is the outline of the crown on lateral incisors?

oval/round

What is the outline of the crown on central incisors?

triangle