Morphology of Human Deciduous Mandibular Central Incisor Tooth

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Prof. Rooban Thavarajah's Lecture Series - Morphology of Human Deciduous Mandibular Central Incisor Tooth for First BDS students

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Morphology of Human Deciduous Mandibular Central Incisor Tooth

  1. 1. Prof. Rooban Thavarajah Tooth Morphology Lecture Series Dr. Rooban Thavarajah
  2. 2. Dr. Rooban Thavarajah Deciduous Dentition Mandibular Central Incisor
  3. 3. BACK GROUND  Similar to deciduous mandibular lateral incisor  Is symmetrical from any surface  Crown is relatively wider MD than in permanent incisors – MD dimension NOT greater than crown length Dr. Rooban Thavarajah
  4. 4. LABIAL ASPECT  ~ permanent lateral incisor  root twice length of crown  Mamelons can be present,  Appears wide in comparison to its permanent successor  Root twice length of crown Dr. Rooban Thavarajah
  5. 5. LABIAL ASPECT  Proximal outlines are evenly convex - sharp mesioincisal and distoincisal angles  Convexity less than Maxillary counterpart  height of contour - @ contact area in Incisal 3RD  Incisal margin is straight  Labial surface - smooth, lacking developmental depressions, and flatter than labial surface Dr. Rooban Thavarajah
  6. 6. PALATAL ASPECT  Cingulum is well defined  Marginal ridges are not so well developed  Lingual fossa - shallow.  Smooth  @ middle, incisal third – flat surface  Lingual fossa  MD @ Labial surface > Lingual surface Dr. Rooban Thavarajah
  7. 7. PROXIMAL ASPECT  Mesial aspect  Greater LP than permanent incisors.  Incisal edge is located over root center  Cervical line contour is evenly curved to Ins. edge  Distal aspect - similar to mesial BUT - cervical line exhibits less depth of curvature.  Distal surface a developmental depression Dr. Rooban Thavarajah
  8. 8. INCISAL ASPECT  Incisal edge is straight – divides - labial and palatal portions of the crown into equal halves.  MD and LP dimensions are nearly equal – maxillary central incisor it is wider MD  Labial convex, Lingual concave Dr. Rooban Thavarajah
  9. 9. ROOT  Single, relatively long, and slender.  Labial and Palatal surfaces are convex  Mesial and distal surfaces are somewhat flattened. Dr. Rooban Thavarajah
  10. 10. Dr. Rooban Thavarajah
  11. 11. Dr. Rooban Thavarajah

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