Maxillary Incisors

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Brief morphology of maxillary incisors taken from Wheeler's Dental Anatomy, Physiology and Occlusion

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Maxillary Incisors

  1. 1. Maxillary Incisors Dr. Syed Sadatullah King Khalid University Abha
  2. 2. <ul><li>Contents </li></ul><ul><li>Morphology of Permanent Maxillary Central Incisor </li></ul><ul><li>Chronology and dimensions of Maxillary Central Incisor </li></ul><ul><li>Brief morphology of Maxillary Lateral Incisor </li></ul><ul><li>Objectives </li></ul><ul><li>Identification of maxillary incisors from other teeth </li></ul><ul><li>Understand the morphology of maxillary central and lateral incisor </li></ul><ul><li>Distinguish between the labial, lingual, mesial, distal and incisal surfaces of the maxillary incisors </li></ul>Dr.Syed Sadatullah King Khalid University Abha
  3. 3. Introduction Maxillary incisors are four in number Maxillary central incisor and lateral are similar in anatomy and complement each other in function Their major function is to cut food Maxillary central incisor erupts between the age of 7 and 8 and it is the second permanent tooth to erupt Maxillary lateral incisor erupts between the age of 8 and 9 Dr.Syed Sadatullah King Khalid University Abha
  4. 4. Dr.Syed Sadatullah King Khalid University Abha Maxillary Central Incisor
  5. 5. Dr.Syed Sadatullah King Khalid University Abha Labial aspect
  6. 6. <ul><li>Labial aspect </li></ul><ul><li>The mesial margin is straight and meets the incisal edge at right angle. The distal margin is shorter and more rounded. </li></ul>Dr.Syed Sadatullah King Khalid University Abha Mesial margin straight Distal margin shorter & rounded
  7. 7. <ul><li>The distoincisal angle is more rounded than the mesioincisal angle. </li></ul>Dr.Syed Sadatullah King Khalid University Abha Distoincisal angle more rounded Mesioincisal angle rounded
  8. 8. <ul><li>The labial surface is marked by two developmental groove and has convexity in cervical third. </li></ul>Dr.Syed Sadatullah King Khalid University Abha Convexity in cervical third a b a & b: Developmental depressions 1,2 & 3: Lobes (4 th lobe not visible)
  9. 9. <ul><li>Maxillary central incisor is the widest anterior tooth mesiodistally </li></ul>Dr.Syed Sadatullah King Khalid University Abha Widest anterior teeth
  10. 10. Dr.Syed Sadatullah King Khalid University Abha Lingual aspect
  11. 11. <ul><li>Lingual aspect </li></ul><ul><li>The crown profile is same as that of labial surface except that there is a broad depression in the central portion called the lingual fossa and a well developed cingulum . </li></ul>Dr.Syed Sadatullah King Khalid University Abha Lingual ridge Lingual fossa Cingulum Marginal ridges
  12. 12. Dr.Syed Sadatullah King Khalid University Abha <ul><li>The lingual fossa is bordered by mesial and distal marginal ridges on the sides and the cingulum cervically. </li></ul><ul><li>The cervical line on labial and lingual surface is convex apically. </li></ul>Cervical line convex Lingual aspect Labial aspect
  13. 13. Dr.Syed Sadatullah King Khalid University Abha Mesial aspect
  14. 14. <ul><li>Mesial aspect </li></ul><ul><li>From the mesial aspect the labial margin is convex </li></ul><ul><li>The lingual margin is ‘S’ shaped, being convex near cingulum and concave in the middle </li></ul>Dr.Syed Sadatullah King Khalid University Abha Labial margin convex Convex near cingulum Concave in the middle
  15. 15. <ul><li>Mesial curvature of cervical line (3.5mm) is the most pronounced compared to any other tooth. </li></ul><ul><li>The cervical line on the mesial and distal surface is convex incisally </li></ul>Dr.Syed Sadatullah King Khalid University Abha Cervical line
  16. 16. Dr.Syed Sadatullah King Khalid University Abha <ul><li>Distal aspect </li></ul><ul><li>Distal surface is very similar to the mesial surface. </li></ul>Distal aspect
  17. 17. <ul><li>Incisal aspect </li></ul><ul><li>The crown and incisal margin are centered over root </li></ul><ul><li>Crown profile is almost bilaterally symmetrical </li></ul><ul><li>The incisal margin of newly erupted teeth show three elevations called mamelons. They correspond to the developmental lobes </li></ul>Dr.Syed Sadatullah King Khalid University Abha
  18. 18. Dr.Syed Sadatullah King Khalid University Abha Incisal ridge Incisal aspect Bilaterally symmetrical
  19. 19. <ul><li>Root </li></ul><ul><li>The root is straight and tapers from the cervical line to the apex giving it a conical shape </li></ul><ul><li>The root ends in a blunt apex. </li></ul>Dr.Syed Sadatullah King Khalid University Abha Straight conical blunt root
  20. 20. Dr.Syed Sadatullah King Khalid University Abha 3.5 2.5 6.0 7.0 7.0 8.5 13.0 10.5 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 Contact Area Max C.I Mesial Distal I 3 JIM 3 I 3 - Incisal third JIM 3 -Junction of incisal & middle third CHRONOLOGY Appearance of enamel organ 5 m.i.u First evidence of calcification 3-4 months Crown completion 4-5 years Eruption 7-8 years Root completion 10-11 years
  21. 21. Dr.Syed Sadatullah King Khalid University Abha <ul><li>Maxillary Lateral Incisor </li></ul><ul><li>The general shape is similar to maxillary central incisors except that they are shorter and narrower. </li></ul><ul><li>Next to third molars maxillary lateral incisors are the teeth that show most variation in crown size, shape and form </li></ul>Maxillary central incisor bigger and lateral incisor smaller
  22. 22. <ul><li>The mesioincisal and distoincisal angles are more rounded than the corresponding angles of the maxillary central incisor </li></ul>Dr.Syed Sadatullah King Khalid University Abha Distoincisal angle more rounded Mesioincisal angle more rounded Maxillary Lateral Incisor Maxillary Central Incisor Mesioincisal angle Distoincisal angle
  23. 23. <ul><li>On the lingual aspect the marginal ridges and cingulum are more prominent </li></ul>Dr.Syed Sadatullah King Khalid University Abha Prominent cingulum Prominent marginal ridges
  24. 24. Dr.Syed Sadatullah King Khalid University Abha Labial aspect Lingual aspect Mesial aspect Distal aspect

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