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Maxillary Central Incisors
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Terms in this set (24)
MXL Central and Lateral Incisors are important for which 3 phonetic sounds?
Th, F, V
Maxillary CIs are the widest incisors in which dimension?
Mesiodistally (MD)
The labial surface of a MXL CI is (more/less) convex than the laterals?
Labial surface is LESS convex than lateral
How many roots, pulpal horns, lobes, and cusps in the MXL central incisor?
1 root, 3 pulp horns, 4 lobes (mesiofacial, midfacial, distofacial, and labial), 0 cusps
The contact in a MXL CI is more cervical on the mesial or distal?
Contact is more cervical on the DISTAL. It is between the incisal and middle thirds. Whereas on the mesial it is in the incisal third
The contact in a MXL CI is more incisal on the mesial or distal?
Contact is more incisal on the MESIAL
A good way to identify the MXL CI being tooth 8 or 9 is by looking at...?
The distoincisal line angle. The corner is less sharp on the distal side.
Also, the distal side is more convex when you look at the tooth from the facial.
So in general, the distal size is more curved (more convex side and the corner is less sharp)
Does the crown of a MXL CI taper?
Crown tapers lingually, so you have a triangular cross section at the root pointing lingually
Would a straight line from the apex bisect the incisal edge when viewed from the proximal in a maxillary CI?
Yes, it bisects the apex and incisal edge
In which third is the height of contour (for labial and lingual sides) when viewed from the proximal for a MXL CI? Which is more cervical?
Both HoC are in the cervical third. The lingual is more cervical b/c of the cingulum.
The curvature of the CEJ is greater on which side?
Mesial. It is also the greatest curvature of the CEJ compared to any tooth.
What are the 2 important variations of a MXL CI?
Hutchinson's Incisors = notch in the primary teeth (you get 2 spikes so it looks like an M but a little more curved)
Mamelons = 3 bumps because of the 3 lobes beneatht hem
This tooth has the greatest FL axial inclination
MXL CI
This tooth has the greatest MD crown dimension of any anterior tooth
MXL CI
True/False: MXL CI is wider MD than FL
True
Which embrasure is larger on a MXL CI, the facial or lingual?
Lingual embrasure is larger
Which tooth has the greatest cervical curvature (curvature of the CEJ) on the mesial of any tooth?
MXL CI
NUMBERS: Cervicoincisal length of crown of MXL CI? Length of root of MXL CI?
10.5 crown
13.0 root
NUMBERS: Mesiodistal diameter of crown of MXL CI? What about at the cervix?
8.5 MD
7.0 at cervix
NUMBERS: Faciolingual diameter of crown of MXL CI? What about at the cervix?
7.0 FL
6.0 at cervix
NUMBERS: Curvature of CEJ at mesial of MXL CI? What about at distal?
3.5 at mesial
2.5 at distal
NUMBERS: Eruption of MXL CI? When is the root completed?
Erupts: 7-8 yr
Root completed: 10 yr
NUMBERS: First evidence of calcification of MXL CI? When is the enamel completed?
First evidence of calcification: 3-4 mo
Enamel completed: 4-5 yr
ERUPTION: In the maxillary arch, the central incisors are the ____ tooth to erupt.
2nd in the maxillary arch (erupts between 7-8 yrs)
MXL: 1st M, CI, LI, 1st PM, 2nd PM, Ca, 2nd M, 3rd M
First molars erupt first
For the mandibular arch, the 1st molars erupt first, then it goes CI, LI, Ca, 1st PM, 2nd PM, 2nd M, 3rd M (it's like in order after the 1st molar.
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