dental anatomy lab Permanent Mandibular right first molar drawing steps

1. Dental Anatomy
Permanent Mandibular Right First Molar

2. Contents
* Table.
* Drawing
A- Kit.
B- Steps.

3. Table 12-1

4. Drawing Kit
1- Graphical copybook.
2- Pencil.
3- eraser.
4- Ruler.
1
4
3
2

5. Drawing Steps

6. Note :
Scale Drawing
Each 1 mm in table
=
1 medium square in graph paper.

7. Tips :
Drawing with
tracing paper
is helpful.

8. Buccal Surface

9. 1- Tooth name
• Full name=
• Dentition + Arch + Side + Tooth

10. 2- Surface name
• Buccal because tooth Posterior.

11. 3- Midline
• To identify the mesial and
distal surfaces.

12. 4- Cervical line
• To identify the crown and root.

13. 5- Measurements :
(Table 12-1)
• A- Length of crown = 7.5 mm

14. B- Thirds division :
• Cervico- Occlusal =
Cervical + middle + Occlusal
• Cervical = 2.5 mm.
• Middle = 2.5 mm.
• Occlusal = 2.5 mm.

15. • C- Length of Root =
‎
14 mm.
5- Measurements :
(Table 12-1)

16. • D- Mesiodistal diameter of crown
at cervical line .
• = 9 mm.
• ( 4.5 mm Mesial , 4.5 mm Distal ).
5- Measurements :
(Table 12-1)

17. • E- Mesiodistal diameter of crown = 11 mm.
• ( 5.5 mm mesial , 5.5 mm distal ).
• Location of contact area:
• Mesial = at junction of middle and occlusal
third.
• Distal = at middle of middle third.
5- Measurements :
(Table 12-1)

18. • F- Buccal cusps dimension =11 mm.
• So;
• Mesiobuccal cusp = 4.5 mm.
• Distobuccal cusp = 4.5 mm.
• Distal cusp = 2 mm.

19. • Root Trunk = 4 mm.
• Root trunk = distance from
cervical line to Bifurcation
area of root.

20. • Root
• interapical distance= 7 mm.
• Divided to :
• Mesial = 2 mm .
• Distal = 5 mm .

21. • Cusps ;
• Mesiobuccal ,
• Distobuccal,
• Distal ,
• Shorter 0.5 mm than the
• Mesiolingual,
• Distolingual.

22. • Connect between the points.
• Mesial outline.
6- Draw the surface.

23. • Connect between the
points.
• Distal outline
6- Draw the surface.

24. • Locate Buccal
Developmental grooves;
• Mesiobuccal groove..
extend to middle third.
6- Draw the surface.

25. • Locate Buccal
Developmental grooves;
• Distobuccal groove ..
longer than mesiobuccal
groove and extend more
cervically.
6- Draw the surface.

26. 6- Draw the surface.
• Connect between cusps;
• Mesiobuccal cusp

27. • Connect between cusps;
• Distobuccal cusp
6- Draw the surface.

28. • Connect between cusps;
• Distal cusp
6- Draw the surface.

29. • Root
• Mesial root.
6- Draw the surface.

30. 6- Draw the surface.
• Root
• Distal root.

31. 6- Draw the surface.
• Cervical Line ;
• 1- regular.
• 2- Dipping apically.

32. Final draw
• Buccal Surface

33. Mesial Surface

34. 1- Tooth name
• Full name=
• Dentition + Arch + Side + Tooth

35. 2- Surface name
• Mesial surface.

36. 3- Midline
• To identify the Buccal and
Lingual surfaces.

37. 4- Cervical line
• To identify the crown and root.

38. • A- Length of crown = 7.5 mm.
5- Measurements :
(Table 12-1)

39. • B- Length of Root = 14 mm.
5- Measurements :
(Table 12-1)

40. C- Thirds division :
• Cervico- Occlusal =
Cervical + middle + Occlusal
• Cervical = 2.5 mm.
• Middle = 2.5 mm.
• Occlusal = 2.5 mm.

41. • D- Buccolingual diameter of
crown at cervical line = 9 mm.
• ( 4.5 mm buccal , 4.5 mm lingual).
5- Measurements :
(Table 12-1)

42. • E- Buccolingual diameter of crown
= 10.5 mm.
• Crest of curvature :
• 1- Buccal = within cervical third.
5- Measurements :
(Table 12-1)

43. • E- Buccolingual diameter of crown
= 10.5 mm.
• Crest of curvature :
• 2- Lingual = middle third.
5- Measurements :
(Table 12-1)

44. • F- Intercuspal distance = 5 mm.
• ( 2.5 mm buccal , 2.5 mm lingual).

45. • G- Buccal cusp shorter than
lingual cusp = 0.5 mm.

46. • Connect between the
points.
• Buccal outline.
6- Draw the surface.

47. • Connect between the points.
• Lingual outline.
6- Draw the surface.

48. • Sulcus Depth = 1 mm.

49. • Roots:
• Mesial root only.
6- Draw the surface.

50. • Connect between the points.
• Buccal and lingual cusp slopes.
6- Draw the surface.

51. • Connect between the points.
• Mesial marginal ridge.
6- Draw the surface.

52. 6- Draw the surface.
• Cervical line = 1mm.

53. Final Draw
• Mesial Surface.

54. Reference :
*Wheeler’s Dental Anatomy and Physiology.

55. END OF LAB