Mandibular Incisors

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Mandibular Incisors

  1. 1. Mandibular Incisors Dr. Syed Sadatullah Ibnsina National College Jeddah
  2. 2. Introduction Mandibular incisors are four in number Mandibular central incisor and lateral are similar in anatomy and complement each other in function They are smaller than the maxillary incisors Mandibular central incisor erupts between the age of 6 and 7 Mandibular lateral incisor erupts between the age of 6 and 8
  3. 3. <ul><li>Labial aspect </li></ul><ul><li>Labial surface of mandibular central incisor is very small. It is the narrowest tooth mesiodistally of all the permanent teeth </li></ul><ul><li>It is bilaterally symmetrical </li></ul><ul><li>It is the only incisor where both mesioincisal and distoincisal angles are sharp and at right angles </li></ul><ul><li>The labial surface is inclined lingually </li></ul>
  4. 4. Labial aspect
  5. 5. <ul><li>Lingual aspect </li></ul><ul><li>The lingual aspect is concave from the incisal edge to the cervical line </li></ul><ul><li>Cingulum is smooth and barely visible </li></ul><ul><li>The surface is smooth and devoid of any grooves. No other tooth in the mouth, except the mandibular lateral incisor, shows so few developmental lines and grooves. </li></ul>
  6. 6. Lingual aspect
  7. 7. <ul><li>Mesial aspect </li></ul><ul><li>The labial outline is almost straight, except near cervical third where it is convex </li></ul><ul><li>The lingual margin is ‘S’ shaped </li></ul><ul><li>The cervical line on the mesial and distal surface is convex incisally </li></ul>
  8. 8. Mesial aspect
  9. 9. <ul><li>Distalaspect </li></ul><ul><li>Distal surface is very similar to the mesial surface. </li></ul><ul><li>The cervical line is less curved. </li></ul>Distal aspect
  10. 10. <ul><li>Incisal aspect </li></ul><ul><li>This aspect illustrates the bilateral symmetry of this tooth. </li></ul><ul><li>The labiolingual diameter is greater than mesiodistal diameter. </li></ul><ul><li>Newly erupted teeth show mamelons which wear off upon mastication </li></ul>Incisal aspect
  11. 11. <ul><li>Root </li></ul><ul><li>The root is single and straight. </li></ul><ul><li>The deflection of the root if present is on the labial or distal side. </li></ul>3.0 2.0 5.3 6.0 3.5 5.0 12.5 9.0 Curvature of Cervical Line M D Labiolingual Diameter at Cervical Line Labiolingual Diameter at Crest of Curvature Mesiodistal Diameter at Cervical Line Mesiodistal Diameter at Contact Area Root Length Crown Length Average Dimensions in millimeters
  12. 12. <ul><li>Mandibular Lateral Incisor </li></ul><ul><li>Mandibular lateral incisor is slightly wider mesiodistally </li></ul><ul><li>The concavity in the lingual aspect is slightly more when compared to mandibular central incisor </li></ul><ul><li>The cervical portion of the lingual aspect is narrower while the incisal portion is wider. This gives the crown a more or less a fan shaped appearance </li></ul><ul><li>The incisal edge follows the mandibular arch, giving the crown a slightly twisted appearance on its root </li></ul>
  13. 13. Labial aspect Lingual aspect Mesial aspect Distal aspect Incisal aspect

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