Term
| How many lobes of development do mandibular incisors have? |
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Definition
| Four lobes of development: 3 facial, 1 lingual |
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Term
| What teeth are least susceptible to caries |
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Definition
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Term
| Describe the cingulum and what is plural for cingulum |
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Definition
| Indistinct cingulum (plural = cingula) |
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Term
| What is shape for the mandibular central incisor labial view? |
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Definition
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Term
| What is the most symmetric tooth? |
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Definition
Mandibular central incisor
-Difficult to distinguish right central from left central
-Mesial and distal outlines converge equally
to the cervical = symmetrical
-MI and DI angles are equally acute = symmetrical |
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Term
| Describe the incisal edge and height of contour of mesial and distal for the mandibular central incisor labial view |
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Definition
Incisal edge is straight and at a right angle to the long axis of the tooth
- Height of contour of mesial and distal = the same on both mesial and distal (Just apical to the incisal angles) |
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Term
Mandibular central incisor labial surface:
-Where is the height of contour?
-Explain the cervical line.
-Are there developmental seams and/or mamelons present? |
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Definition
-Height of contour is in the cervical 1/3 while the incisal 2/3 is flat
-Cervical line forms small arc toward root
-No developmental seams but mamelons are present at eruption |
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Term
What shape is the mandibular central incisor from the lingual view?
The cingulum forms the ____ third |
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Definition
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Term
Mandibular central incisor lingual view:
-Explain the marginal ridges
-Explain the lingual fossa
-Explain the cingulum
-Is the mesial marginarl ridge wider or more narrow than distal marginal ridge? |
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Definition
-Marginal ridges are indistinct
-Lingual fossa is relatively flat and indistinct
-Cingulum is small, centered and indistinct
-Mesial marginal ridge is slightly wider than Distal marginal ridge |
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Term
Mandibular central incisor proximal view:
-What is the shape?
-Is the incisal edge centered or slightly off (which direction)?
-The labial outline is _____ |
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Definition
-Triangular
-Incisal edge is slightly lingual to the center of the tooth Fa-Li
-Labial outline is convex |
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Term
Mandibular Central Incisor proximal view:
-Compare the labial and lingual curvature to maxillary incisors
-Compare the cervical line on distal and mesial
-Compare the developmental depression on distal and mesial root |
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Definition
-Labial and lingual curvature is less than maxillary incisors
-Cervical line forms deep V toward incisal slightly flatter cervical curve on distal
-Developmental depression on distal of root more prominent than on mesial |
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Term
| Explain the incisal edge on the mandibular central incisor incisal view |
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Definition
-Incisal edge straight from mesial to distal
-Incisal edge isalmost at a right angle to a line bisecting the tooth labiolingually |
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Term
Is the labial or lingual surface more visible in the incisal view of the mandibular central incisor?
Why? |
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Definition
More of the labial surface is visible than lingual
(incisal edge is lingual to the center of the tooth) |
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Term
| Explain the roots of mandibular incisors |
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Definition
single root
straight
tapered
rounded at the apex |
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Term
| Is the mandibular central incisor root broader labiolingually or mesiodistally? |
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Definition
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Term
| Is the mandibular lateral incisor mesial or distal developmental groove more pronounced? |
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Definition
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Term
| Is the mandibular central or lateral incisor larger? |
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Definition
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Term
| Does the mandibular central or lateral incisor have the longer root? |
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Definition
| mandibular lateral incisor |
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Term
| Describe the incisal edge of the mandibular lateral incisor labial view |
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Definition
-Incisal edge slopes downward on distal (central does not slope)
-Distoincisal (DI) corner is more obtuse and slightly rounded than MI |
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Term
Mandibular lateral incisor labial view:
-Compare the distal outline to the mesial outline
-Compare the distal half of the crown to mesial half
-The distal contact is more _____ than mesial contact. |
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Definition
-Distal outline slightly more round than mesial
-Distal half of crown has greater bulk
-Distal contact more cervical |
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Term
Mandibular lateral incisor lingual view:
Describe the lingual fossa
is the cingulum centered or slightly off (which direction)? |
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Definition
- Lingual fossa more defined than on central
- Cingulum is slightly distal of center |
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Term
| Explain the mesial and distal views of the mandibular lateral incisor |
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Definition
| Same as central except you can see more of the lingual surface when viewing from the mesial |
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Term
Mandibular lateral incisor incisal view:
Explain the incisal edge
How does the incisal portion appear?
Explain the cingulum |
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Definition
- Incisal edge NOT at right angle to labiolingual plane
- Incisal portion appears twisted = distolingual twist
-cingulum is off center |
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Term
| When is the first evidence of calcification for mandibular central and lateral incisors? |
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Definition
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Term
| When is the enamel completed for mandibular central and lateral incisors? |
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Definition
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Term
| When is eruption for mandibular central and lateral incisors? |
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Definition
| 6-7 years (C) 7-8 years (L) |
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Term
| When is the root completed for mandibular central and lateral incisors? |
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Definition
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