3. 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

4. Mandibular Incisors 2 1 2 1 1 : Mandibular Central Incisor 2 : Mandibular Lateral Incisor

6. Labial aspect

9. Lingual aspect

12. Mesial aspect

16. Incisal aspect

20. 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 CHRONOLOGY Appearance of enamel organ 5 m.i.u First evidence of calcification 3-4 months Crown completion 4-5 years Eruption 6-8 years Root completion 10 years Contact Area Man L.I Mesial Distal I 3 I 3 I 3 - Incisal third

24. Labial aspect Lingual aspect Mesial aspect Distal aspect Incisal aspect