Mandibular Incisors Flashcards
1
Q
age of eruption - 24/25
A
6-7 y
2
Q
age of eruption - 23/26
A
7-8 y
3
Q
24 and 25 features
A
“twins”
- smallest teeth in mouth in crown and in length
- bilaterally symmetrical
- MI and DI about 90 degrees
- M&D contacts both in incisal third
- incisal edge perpendicular to long axis of the tooth
- cingulum centered
- CEJ curvature less pronounced than maxillary incisors
4
Q
23 and 26 - laterals - features
A
- D more rounded, more like maxillary teeth
- M contact in in the incisal 1/3, D contact in the incisal 1/3 but more cervical than the M contact
- anatomy more distinct than the centrals
- cingulum displaced to the distal
- slight tapering of root near distal
- CEJ curvature less pronounced than maxillary incisors
5
Q
M & D views
A
- depressions can be present - D more likely to have a groove and to have a large groove
- incisal edges are more toward the lingual - makes sense, these teeth have to fit inside the maxillary arch
- CEJ curvature mirrors that of the maxillary incisors - but maybe not as pronounced & not as much diff b/w M and D curvatures
- tooth WIDER M/D than F/L! (diff from max)
6
Q
max and mand incisors meet
A
incisal edge of mand at the cingulum of the max
7
Q
lateral incisor crown twists
A
DI edge twisted toward the lingual (curved in, the arch is smaller and needs to curve sooner, makes sense)
8
Q
incisal view comparison
A
centrals - bilaterally symmetrical
laterals - distal twists more - not bilaterally symmetrical
9
Q
mamelons
A
are possible
10
Q
why a fatter root with grooves? (true for centrals and laterals)
A
- wider root makes them stronger
- groove = more surface area = stronger for anchoring w/ periodontal ligament
- **root could get thinner in the center and create 2 canals; important to know if doing a root canal!
