Tooth morphology...the architecture of part 3.....premolar and molar

MORPHOLOGY OF TOOTH ......

1. 1 Dr. Manoranjan Mahakur 1 st year PGT Department of Pedodontics & Preventive Dentistry, SCB Dental College & Hospital , Cuttack -7, Odisha . LOGY OF TOOTH MORPHOLOGY -3 ( the conclusion )

2. 2 Which Incisor is most likely to have a bifurcated root ??? …. A- Mx CENTRAL INCISOR C- Md LATERAL INCISOR B- Mx LATERAL INCISOR D- Md CENTRAL INCISOR

3. 3 Which day is “ Love Your Teeth Day”. SEPTEMBER 20

4. 4 MORPHOLOGY OF PREMOLARS

5. 5 BUCCAL VIEW OF Premolar Convex buccal surface , Pentagon out line Buccal cusp tip is located slightly distal of vertical axis line ( exception). Presence of Buccal Ridge on the middle of crown Root – Convex ,Tapers apically Apical third bend distally.

6. 6 CONTACT AREA OF Premolar Mesial- near the junction of the incisal and middle third Distal -Distal contact is more cervical

7. 7 LINGUAL VIEW OF Premolar Convex Narrower on lingual than buccal side.

8. 8 PROXIMAL VIEW OF Premolar Buccal and Lingual triangular ridges slope from each cusp to the occlusal Sulcus meeting at the central groove . Presence of Transverse ridges . Crest of Curvature – Buccal- Near junction middle and cervical third Lingual – Centre. Mesial marginal ridge is more Occlusally than distal MR. ( except Md 1st PM )

9. 9 OCCLUSAL VIEW OF Premolar Wider faciolingually than mesiodistally. Cusp slopes and marginal ridges bound the occlusal table. Presence of triangular ridge (except Md 2 nd PM) Presence of Central Developmental groove except mandibular premolar.

10. 10 No main foramen was seen in 24% of maxillary premolars and 26% of maxillary incisors. ( Morfis et al….Cohen…the path ways of pulp)

11. 11 Maxillary vs. mandIbular PREMOLAR

12. 12 Maxillary vs. mandIbular PREMOLAR

13. 13 Maxillary vs. mandIbular PREMOLAR

14. 14 Maxillary vs. mandIbular PREMOLAR

15. 15 MAXILLARY FIRST PREMOLAR MAXILLARY SECOND PREMOLAR

16. 16 BUCCAL VIEW MAX 1 ST PM MAX 2 ND PM

17. 17 LINGUAL VIEW MAX 1 ST PM MAX 2 ND PM

18. 18 MESIAL VIEW MAX 1 ST PM MAX 2 ND PM

19. 19 OCCLUSAL VIEW MAX 1 ST PM MAX 2 ND PM

20. 20 Point to know MAX 1 ST PM MAX 2 ND PM

21. 21

22. 22

23. 23 MANDIBULAR FIRST PREMOLAR MANDIBULAR SECOND PREMOLAR

24. 24 BUCCAL VIEW MD 1 ST PM MD 2 ND PM BUCCAL

25. 25 LINGUAL VIEW MD 1 ST PM MD 2 ND PM L I N G U A L

26. 26 MESIAL VIEW MD 1 ST PM MD 2 ND PM P R O X I M A L

27. 27 OCCLUSAL VIEW MD 1 ST PM MD 2 ND PM O C C L U S A L

28. 28 POINT TO KNOW MAND 1 ST PM MAND 2 ND PM

29. 29

30. 30

31. 31 MORPHOLOGY OF MOLARS

32. 32 Modified Osteo- Odonot - Keratoprosthesis (MOOKP). 

33. 33 What is this ???

34. 34 Mandibular molar some point Largest mesiodistal dimension 11.4mm. Buccal groove – 2 in 1 st molar ,1 in 2 nd molar Contact- Mesial- junction of middle and occlusal third Distal-middle of tooth Cervical line mostly straight ( 90% mongoloid dipping down of enamel) 2 roots , mesial 1 mm longer than distal BUCCAL

35. 35 What is Flexion… Extreme distal root curvature seen in some mandibular molar.

36. 36 Point to know for Mandibular molar Narrower on lingual side Lingual cusp more pointed , ML wider than DL Presence of lingual groove Cervical line straight LINGUAL

37. 37 Point to know for Mandibular molar Crown shorter cervico-occlusally Lingual tilt Distal tilt Crown narrower on distal side PROXIMAL

38. 38 Point to know for Mandibular molar Rectangular or Pentagon shape Grooves mandibular 1 st molar – Zigzag Mandubular 2 nd Molar + shaped Tuberculum sextum - six cusp of mandibular molar b/t distal cusp and distolingual cusp Tuberculum intermedium when present b/t the two lingual cusp. ( Common in Chinese people) OCCLUSAL

39. 39 MANDIBULAR FIRST MOLAR MANDIBULAR SECOND MOLAR

40. 40 how to differentiate Mandibular 2 nd molar from 1 st Molar Four cusp and more symmetrical crown

41. 41 how to differentiate Mandibular 2 nd molar from 1 st Molar Less cervical crown convergence One buccal groove with out Pit Contact area more cervical Longer and straighter root Crown tapered more distally BUCCAL

42. 42 how to differentiate Mandibular 2 nd molar from 1 st Molar Less broad mesial root Less wide root apex MESIAL

43. 43 how to differentiate Mandibular 2 nd molar from 1 st Molar Prominent buccal cervical ridge Rectangular out line Cross shaped groove pattern more frequent Secondary developmental groove Less frequent marginal ridge grooves Central groove is straight OCCLUSAL

44. 44 POINT TO KNOW MAND 1 ST Molar MAND 2 ND Molar

45. 45 Some point for Mandibular 3 rd molar.. Bulbous crowns – convex on buccal and more on the lingual Small or narrow wrinkled occlusal surface 4/5 cusp MB cusp wider and longer Crown tapper from mesial to distal Small crown to root ratio short root , frequently fused ,apical third curved distally

46. 46

47. 47 Point to know for Maxillary Molars Largest maxillary teeth. 5 cusp , MB longer and wider than DB Buccal Groove – End in pit on buccal surface Contact- Mesial- junction of middle and occlusal third Distal -middle of tooth Occlusocervical Dimension of crown tapers to the Distal 3 roots, Palatal >MB>DB BUCCAL

48. 48 Point for Maxillary molar Lingual surface is narrower in the cervical third 2 nd molar smaller than 1 st Cusp of carabelli present on first molar 4 cusp /3 cusp 2 nd molar Root tapper apically to blunt 1 st molar root – longitudinal depression LINGUAL

49. 49 Point for Maxillary Molar 1 st molar square or rhomboid 2 nd molar twisted parallelogram Tapered to lingual on 2 nd and 3 rd molar Unique oblique ridge extending from ML to DB cusp OCCLUSAL

50. 50 MAXILLARY FIRST MOLAR MAXILLARY SECOND MOLAR

51. 51 How to differentiate Maxillary 2 nd molar from 1 st Molar Both distal cusp are smaller

52. 52 how to differentiate Maxillary 2 nd molar from 1 st Molar Crown distally tilt Buccal groove shorter without pit More prominent mesiobuccal cervical ridge Crown narrower on lingual side. Absent of cusp of carabelli BUCCAL & LINGUAL

53. 53 how to differentiate Maxillary 2 nd molar from 1 st Molar Crown smaller mesiodistally Mesial marginal ridge less often has groove and tubercle MESIAL

54. 54 how to differentiate Maxillary 2 nd Molar from 1 st Molar Smaller oblique ridge More wrinkles pit and groove pattern Occlusal parallelogram is twisted OCCLUSAL

55. 55 how to differentiate Maxillary 2 nd Molar from 1 st Molar Root less spread apart Root bend more to distal Longer root trunk ROOT

56. 56 POINT TO KNOW Max 1 ST Molar Max 2 ND Molar

57. 57

58. 58 Maxillary vs. mandIbular MOLAR

59. 59 Maxillary vs. mandIbular MOLAR

60. 60 WHAT IS THIS MYSTERIOUS…..!!!

61. 61 Triangular Ridge present in all premolar except??? …. A- Mx 1 st Premolar C- Md 1 st Premolar B- Mx 2 nd Premolar D- Md 2 nd Premolar

62. 62 REFERENCE Text book of dental antomy wheelers Shafer’s Text book of oral pathology Dental Anatomy … by WOELFEL http://www.bbc.com/earth/story/20150122-is-this-a-new-species-of-human

63. 63 Children smile 400 times a day, while adults only smile 20.

64. 64 “ I will remember that I do not treat a fever chart, a cancerous growth, but a sick human being, whose illness may affect the person's family and economic stability. My responsibility includes these related problems, if I am to care adequately for the sick.” ( Hippocratic oath line 6) Upcoming seminar……. Biology of Orthodontics tooth movement