Oral Anatomy 2 - The Maxillary Second (lateral) Permanent Incisor

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james14hunter
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285793
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Oral Anatomy 2 - The Maxillary Second (lateral) Permanent Incisor
Updated:
2014-10-15 09:38:38
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Oral Anatomy Maxillary Second lateral Permanent Incisor
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Oral Anatomy 2 - The Maxillary Second (lateral) Permanent Incisor
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Oral Anatomy 2 - The Maxillary Second (lateral) Permanent Incisor
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  1. Generally speaking, what is the maxillary second (lateral) permanent incisor like?
    • This is one of the most variable teeth in the dentition, although generally it is psychologically a diminutive form of the maxillary central incisor with slight modifications.
    • The crown is much narrower and shorter than that of the central incisor, though the crown:root length ratio is considerably decreased.
  2. How does the maxillary second (lateral) permanent incisor appear from the incisal aspect?
    From the incisal aspect, the crown has a more rounded outline than the adjacent central incisor.
  3. How does the maxillary second (lateral) permanent incisor appear when viewed labially?
    Viewed labially, the mesioincisal and distoincisal angles and the mesial and distal crown margins are more rounded than those of the central incisors.
  4. How does the maxillary second (lateral) permanent incisor appear when viewed palatally?
    • The palatal aspect of the crown is similar to that of the central incisor, though the marginal ridges and cingulum are often more pronounced. 
    • Consequently, the palatal concavity appears deeper.
  5. What is the foramen caecum?
    Lying in front of the cingulum is a pit called the foramen caecum that may extend some way into the root.
  6. How do the mesial and distal aspects of the maxillary second (lateral) permanent incisor appear?
    The mesial and distal aspects of the lateral incisor differ little from those of the central incisor.
  7. What is a common morphological variation for the maxillary second (lateral) permanent incisor?
    A common morphological variation is the so-called 'peg shaped' lateral incisor, which has a thin root surmounted by a small conical crown.
  8. What is the root like on the maxillary second (lateral) permanent incisor?
    • The course of the cervical margin and the shape of the root are similar to those of the central incisor.
    • However, the root is often slightly compressed and grooved on the mesial and distal surfaces.

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