Maxillary Central Incisors

Question 1

For maxillary central incisors, what is the expected time of eruption?

Answer 1

7-8 years

Question 2

For maxillary central incisors, what is the mesial outline shape from the facial view? Distal outline?

Answer 2

Mesial=Straight with sharp MI angle

Distal=More rounded with rounded DI edge

Question 3

For maxillary central incisors, how many lobes are there?

Answer 3

4. 3 facial and 1 palatal (lingual)

Question 4

What is the crown shape from the facial view for the maxillary central incisors?

Answer 4

Rectangular, square, imperfect square (b/c of the rounded DI edge), and trapezoid.

Question 5

What are the two developmental grooves on the facial surface of maxillary central incisors?

Answer 5

Labial grooves

Question 6

The incisal borders of the three maxillary central incisors are called what?

Answer 6

Mamelons

Question 7

What is the non-incisal lobe of the maxillary central incisors called?

Answer 7

Cingulum

Question 8

What anterior tooth is wider mesio-distally than any other?

Answer 8

maxillary central incisors

Question 9

For maxillary central incisors, what are the heights of contour (contact locations) for the mesial and distal edges?

Answer 9

Mesial: Incisal 1/3
Distal: Junction of middle and incisal 1/3

Question 10

For maxillary central incisors, what is the root shape? What is the cross section shape?

Answer 10

Root is cone shape. When cross sectioned, root and pulp chamber appear triangular.

Question 11

For maxillary central incisors, what is the crown shape from the mesial view?

Answer 11

Triangular or wedge shaped.

Question 12

For maxillary central incisors, describe the facial and lingual outlines from the mesial/distal view?

Answer 12

Facial outline: Convex in cervical and middle 1/3s, flat in the incisal 1/3
Lingual outline: Convex cervical 1/3 (cingulum), Concave middle and incisal 1/3s

Question 13

For maxillary central incisors, what are the cervical heights of contour for the buccal (facial) and lingual sides?

Answer 13

Cervical 1/3 for the facial and lingual sides.

Question 14

What tooth has the greatest CEJ curvature incisally?

Answer 14

maxillary central incisors

Question 15

How does the lingual fossa of the central maxillary incisors compare to the lingual fossa of the lateral maxillary incisors?

Answer 15

The CMI’s lingual fossa is not as deep or defined.

Question 16

For maxillary central incisors, what are the shapes of the mesial and distal marginal ridges?

Answer 16

Mesial marginal ridge is straight
Distal marginal ridge is curved (causes height of contour to be slightly lower than mesial side, at junction of middle and incisal 1/3)

Question 17

For maxillary central incisors, what is the shape from the incisal view?

Answer 17

Roughly triangular with the facial side being wider and the lingual side tapering at the cingulum. The incisal edge is slightly curved towards the facial side.

Question 18

For maxillary central incisors, in what direction does the crown taper?

Answer 18

lingually

Question 19

For maxillary central incisors, what is the contact location buccolingually?

Answer 19

Centered both mesially and distally.

Question 20

What tooth has the steepest CEJ curvature on the mesial side than any other?

Answer 20

maxillary central incisors

Question 21

For maxillary central incisors, are they longer I-G or M-D?

Answer 21

Slightly longer I-G, but remember, MCIs have the widest M-D faces of all anterior teeth and are sometimes considered square shaped.