Identifying Maxillary Central Incisors Flashcards
Do maxillary or mandibular central incisors have larger crown?
Maxillary Central Incisors
Describe shape of labial surface
Trapezoidal shape (has 2 uneven sides)
Compare the inciso-gingival length to the mesiodistal length
Longer Inciso-gingivally than Mesiodistally
Longer from cutting edge to gum line tha its side-to-sdie width
Compare width of cervical side to incisal ridge
Width is shorter on cervical side and longer along incisal ridge
Width of tooth at gum line is less than width of tooth at cutting edge
What is a Cervical Ridge?
Linear Elevaton on cervical third of tooth
State the characteristics of the Incisal Angles
- Distoincisal Angle = Slightly Rounded
- Mesioincisal Angle = Sharp
Why do mamelons dissapear after eruption?
Worn away during chewing and biting
What are the 3 developmental lobes of the incisal edge that fue together to form the labial surface?
- Mesiolabial Lobe
- Middle-labial Lobe
- Distolabial Lobe
What are Developmental Lines?
Lines/Depression formd when lobes of a section fuse together
Line/Depression forms at site of fusion
What are the 3 main Developmental Lines on the Labial Surface
- Mesiolabial Developmental Depression
- Distolabial Developmental Depression
- Imbrication Lines (near cervical margin)
Describe the overall shape of the root
Cone-shape that tapers to a blunt apex
Describe the Mesial Outline of the root
Mesial outline of root is slightly convex
Describe Distal Outline of the root
Distal outline is more convex (fairly rounded)
Describe the Cingulum on the Lingual Surface
Pronounced Cingulum found centrally on the cervical third
What is the well-defined depression in the lingual side of tooth called
Lingual Fossa
Desscribe the boundaries of the Lingual Fossa
- Cingulum (Top Boundary)
- Mesial Marginal Ridge (Side Boundary)
- Distal Marginal Ridge (Side Boundary)
- Incisal Ridge (Bottom Boundary)
Describe rough shape of the Mesial Surface
Triangular in shape
Base formed by cervical margin, Tip formed by apex of incisal area
True of False: Incisal Edge is in line with Root Apex
True
What are the 3 differences between the Mesial and Distal Surface
- Distal Surface has less curvature for cervical line
- Distal Convergence (Smaller distal surface)
- Contact area is more cervical on distal surface
