Maxillary Incisors Flashcards
Class Traits
- Used for cutting
- Generally flat with a horizontal biting edge
- Usually single rooted
- Permanent incisors are the only teeth with mamelons
Developmental Lobes
Four developmental, three facial (mesial, middle, distal) and one lingual
Functions
- Cut food
- Articulate speech
- Help to support the lip and maintain an esthetic appearance
- Anterior guidance
The mesial CEJ line is usually (more OR less) incisally positioned than the distal CEJ line
More
The roots frequently incline/curve (mesially OR distally)
Distally
The distal crown contours are usually (more OR less) rounded than the mesial
More
The distal contact areas appear (more OR less) gingivally positioned
More
Eruption Age
Approximately age 7
Crown to Root Ratio
1 : 1.5
On the facial aspect of a maxillary central incisor, the crown is slightly (shorter OR longer) incisocervically than mesiodistally
Longer
On the facial aspect of a maxillary central incisor, the root is:
- Conical and straight
- May incline distally
On the facial aspect of a maxillary central incisor, the mesial outline is:
- Relatively straight
- Contact at the incisal 1/3
On the facial aspect of a maxillary central incisor, the distal outline is (more OR less) rounded with contact at the ______ and _______ thirds
- More
- Incisal and Middle thirds
On the facial aspect of a maxillary central incisor, the incisal edge is:
- Straight
- Has 3 mamelons, one for every developmental lobe
On the facial aspect of a maxillary central incisor, the mesio-incisal angle is (sharp OR not sharp)
Sharp
On the facial aspect of a maxillary central incisor, the distoincisal angle is (more OR less) rounded than the mesio-incisal angle
more
Developmental depressions on the facial aspect of a maxillary central incisor
- Two
- Shallow
- Between the three facial lobes
- More evident on a newly formed tooth
Facial Height of Contour of a maxillary central incisor
The cervical 1/3 of the facial surface that is smoothly convex
The lingual aspect of a maxillary central incisor is (narrower OR wider) than the facial aspect mesiodistally
Narrower
The location of the cingulum of a maxillary central incisor
- Cervical 1/3 of the lingual aspect
- Typically falls distally by just a little
- Happens to be the lingual height of contour
Lingual fossa of a maxillary central incisor
shallow concavity bordered by the incisal edge, cingulum, and the mesial and distal marginal ridges
Developmental grooves of a maxillary central incisor
- Not always, but if there are, they are in the fossa and lingual pit
- Fossa will not be completely smooth
- More common in the lateral than central incisors
On the mesial aspect of a maxillary central incisor, the crown is:
Roughly triangular or wedge-shaped
On the mesial aspect of a maxillary central incisor, the incisal tip and root apex BOTH fall on the _________ line
Bisecting
Height of Contour on the mesial aspect of a maxillary central incisor
- There are two, the facial and lingual
- Both fall in the cervical 1/3
On the mesial aspect of a maxillary central incisor, the CEJ line:
- Curves greatly toward incisal, more than any other tooth of proximal surface
- Most incisally position/pronounced than any other tooth
Due to the turn of the tooth along the arch, on the mesial aspect of a maxillary central incisor, (all OR none) of the lingual convexities are visible
All
The distal aspect of a maxillary central incisor is (shorter OR longer) incisocervically than the mesial
Shorter
On the distal aspect of a maxillary central incisor, the CEJ line is (more OR less) pronounced than the mesial
More
On the distal aspect of a maxillary central incisor, the contact area is (more OR less) cervically positioned than the mesial
- More
- At the junction of the incisal and middle thirds
Due to the turn of the tooth along the arch, on the distal aspect of a maxillary central incisor, you see (more OR less) of the facial surface of the crown
- More
- Also, you cannot see the mesial marginal ridge
The lingual aspect of a maxillary central incisor is roughly triangular and is (wider OR narrower) mesiodistally than faciolingually
Wider
Incisal ridge
- Only called ridge when newly erupted
- Overtime it becomes flattened and then is called edge
On the incisal aspect of a maxillary central incisor, the proximal contacts are located:
- In the middle of the middle 1/3 of the crown and in line with the incisal ridge
- The proximal contact areas increase with size
From the incisal view of a maxillary central incisor, you can see the following features of the lingual surface:
- Cingulum
- Mesial marginal ridge
- Distal marginal ridge
- Lingual fossa
