1. Dental Terminology Dr. Syed Sadatullah College of Dentistry King Khalid University

2. Contents 1. Surfaces of teeth 2. Line angles and point angles 3. Depressions and Elevations on teeth 4. Division in thirds Objectives The prime objective of this lecture is to introduce the dental terminology and its application

6. 3. Proximal Surfaces a. Mesial Surface All surfaces towards the midline. b. Distal Surface All surfaces away from the midline. Mesial surface and Distal surface are collectively called proximal surface. Proximal surfaces

8. Maxillary Arch

9. Mandibular Arch

10. 4 3 2 1 1 1. Labial surface 2. Mesial surface 3. Distal surface 4. Incisal surface

11. 3 3 3 2 1 1. Buccal surface 2. Lingual surface 3. Occlusal surface

13. Line angles of anterior teeth 1. Mesio labial 2. Disto labial 3. Mesiolingual 4. Distolingual 5. Labioincisal 6. Linguoincisal

14. Line angles of Anterior teeth

15. Line angles of posterior teeth 1. Mesiobuccal 2. Distobuccal 3. Mesiolingual 4. Distolingual 5. Mesio-occlusal 6. Disto-occlusal 7. Bucco-occlusal 8. Linguo-occlusal

16. Line angles of Posterior teeth

19. Depressions on tooth surface 1. Pit. A sharp pinpoint depression on the surface of the enamel 2. Fossa . An irregular depression or concavity on the surface of a tooth. 2 1 1. Pit 2. Fossa

20. 3. Sulcus . A long depression on the surface of a tooth. 4. Groove is a shallow linear depression on the surface of a tooth. A developmental groove is a shallow groove or line between the primary parts of the crown or root. A supplemental groove is less distinct and does not mark the junction of primary parts.

21. 1 1. Developmental grooves

22. Elevations on tooth surface 1. Cusp . An elevation or mound on the crown of a tooth. C C C C C Cusps C

23. 2. Cingulum is the lingual lobe of an anterior tooth and makes up the bulk of the cervical third of the lingual surface. Cingulum C

24. 3. Lobe is one of the primary sections of formation in the development of the crown. Cusps and mamelons are representative of lobes. 4. Mamelons are three rounded protuberances found on the incisal ridges of newly erupted incisor teeth.

25. Ridge . A linear elevation on the surface of a tooth Marginal ridges are rounded borders of enamel that form the mesial and distal margins of the occlusal surfaces of posterior teeth and the mesial and distal margins of the lingual surfaces of anterior teeth. Triangular ridge is a ridge that descends from the tips of the cusps of molars and premolars towards the centre part of the occlusal surface. Transverse ridge is formed by the union of buccal and lingual triangular ridges. Oblique ridge is a ridge obliquely crossing the occlusal surfaces of maxillary molars. Dr.Syed Sadatullah Ibnsina National Medical College

26. 1. Marginal ridge 2. Triangular ridge 3. Oblique ridge 1 1 2 2 3 1 1

27. Occlusal aspect of Maxillary Molar

28. Occlusal aspect of Mandibular Molar

30. Anterior Teeth Posterior Teeth

32. Division in thirds facio-lingually (Crown) Crown when viewed from front 1. Mesial third 2. Middle third 3. Distal third Distal Middle Mesial

33. Mesial Middle Distal M D Mesial Middle Distal M D

35. Division in thirds-root 1. Cervical third 2. Middle third 3. Apical third

36. A M C A A M M C C – Cervical M – Middle A – Apical