Ist Dental Students - Morphology

2. Oral Morphology
Oral Biology DepartmentOral Biology Department
Faculty of DentistryFaculty of Dentistry
Mansoura UniversityMansoura University
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3. Anterior Teeth.
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4. Upper central incisor.
Labial aspectLabial aspect Lingual aspectLingual aspect
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5. How to identify the upper.
Central???
The large mesiodistalmesiodistal
width.
Note the sharpsharp
mesioincisalmesioincisal angle and the
rounded distoincisarounded distoincisal angle.
Single conical root.
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6. Upper lateral incisor.
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7. Why upper lateral??
Smaller size.
Both incisal anglesBoth incisal angles are
roundedrounded.
The root is narrower and
curved distally.
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8. Upper incisors..
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9. Lower central incisor.
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10. Lower central incisor.
Labial aspect. Lingual aspect
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11. In lower central
 Crown is inclined lingually.Crown is inclined lingually.
 Both incisal anglesincisal angles are sharp but thesharp but the
distoincisal angle is barely more rounded.distoincisal angle is barely more rounded.
 Constricted neck (fan shaped).Constricted neck (fan shaped).
 Less developed features.Less developed features.
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12. Lower lateral incisor.
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13. Lower lateral.
Both incisal anglesincisal angles are
rounded.rounded.
The incisal edgeincisal edge is sloppedslopped in a
distaldistal direction.
The cingulum is twisted
distolingually from the incisal
aspect.
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14. Lower incisors.
Labial aspect. Lingual aspect.
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15. Upper canine..
Labial aspect Lingual aspect
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16. Upper canine..
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Labial aspect

17. Upper canine.

The cusp tip is located labially to theThe cusp tip is located labially to the
root axis from mesial aspect.root axis from mesial aspect.
Note the level of the contact area
“higher cervical” .“higher cervical” .
The mesial outlinemesial outline of the crown is
convex.convex.
Prominent labial and lingual ridges.Prominent labial and lingual ridges.
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18. Lower canine.
Labial aspect Lingual aspect
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19. Lower canine.
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Labial aspect

20. Lower canine.
The tip of the cusp is located lingually.
Both contact areascontact areas are higher incisalincisal
so the crown appears longer.
The mesial outlinemesial outline of the crowncrown isis
straightstraight with the root outline.root outline.
Less prominent labial and lingualLess prominent labial and lingual
ridges.ridges.
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21. Upper & lower canines.
Labial aspect Lingual aspect
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22. Premolar teeth.
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23. How to know the tooth is
upper or lower ??
 Through the OVERHANG…..OVERHANG…..
If there is no overhangno overhang, the tooth is
upper premolarupper premolar.
If there is a lingual overhangoverhang, the tooth
is lower premolarpremolar.
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24. premolars
Upper lower
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25. Upper 1st
premolar .
Buccal aspect Lingual aspect
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26. Upper 1st
premolar .
Mesial aspect Distal aspect
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27. Upper 1st
premolar .
Occ. aspect
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28. Upper 1st
premolar .
Buccal aspect Mesial aspect
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29. Upper 1st
premolar .
Occ. aspect
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30. Why it is upper 4 ?
 The only premolaronly premolar with 2 roots2 roots.
There is mesial marginal groovemesial marginal groove.
The hexagonalhexagonal outline of the occ.occ.
Aspect.
The lingual cusplingual cusp is shortershorter than the
buccal Cuspbuccal Cusp.
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31. Upper 2nd
premolar .
Bucc. aspect Mesial aspect
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32. Upper 2nd
premolar .
Occ. aspect
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33. Why it is upper 5???
 There is no mesial marginal grooveis no mesial marginal groove.
Less angularLess angular occ. Outline “ovaloval”.
BothBoth lingual and bucc. CuspsCusps at the
same levelsame level.
Wrinkled appearance of occ. aspect as
many supplemental grooves.
Single rootSingle root.
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34. Upper premolars.
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35. Lower 1st
premolar
Bucc. aspect Mesial aspect
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36. Lower 1st
premolar
Occ. aspect
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37. Lower 1st
premolar
Mesial aspect
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Bucc. aspect

38. Lower 1st
premolar
Occ. aspect
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39. Why it is lower 4???
Lingal over hang.
 There is mesiolingual developmental
depression “MLDD”.
The lingual cusp is 23s of the crown
length .
Small sized lingual cusp (marked
lingual convergence).
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40. Lower 2nd
premolar.
Bucc. aspect Lingual aspect
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41. Lower 2nd
premolar.
Mesial aspect Occ. aspect
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42. Lower 2nd
premolar.
Bucc. aspect Ling. aspect
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43. Lower 2nd
premolar.
Mesial asoect Occ. aspect
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44. Why lower 5???
Lingual over hang.
There is no “MLDD”.no “MLDD”.
The lingual cusps are more than 2/3slingual cusps are more than 2/3s
of the crown length.
The 2 lingual cusps2 lingual cusps separated with a
lingual groovelingual groove.
The rectangular outlinerectangular outline of the occ.occ.
Aspect.
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45. Lower 4 & 5.
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46. Molar teethMolar teeth
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47. Upp.6.
Bucc. aspect Ling. aspect
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48. Occ. aspect
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Upp.6.

49. Bucc.aspect Ling. aspect
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Upp.6.

50. Upp.6.
Occ. aspect
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51. Why upper. 6???
The BL width is longer than MD width.The BL width is longer than MD width.
The Occ. OutlineOcc. Outline is rhomboidalrhomboidal in shape
with 2 obtuse angles “ML&DB”.
The obliqe ridge between ML and DB
cusps.
The largest cusplargest cusp is the MLML and the smallestsmallest
is the DBDB.
3 roots.
There may be 55thth
cusp (cusp of Carabelli).cusp (cusp of Carabelli).
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52. Upper. 7.
Bucc. aspect Ling.aspect
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53. Upper. 7
Occ. aspect
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54. Upp. 7
Bucc. aspect Ling. aspect
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55. Upper.7
occ.aspect
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56. Why upper.7???
The Occ. OutlineOcc. Outline is MORE rhomboidalMORE rhomboidal
with 2 obtuse angles ML&DB.
The largest cusplargest cusp is the MLML and the
smallestsmallest is the DL.DL.
No 5No 5thth
cusp.
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57. Upper. 6 & 7.
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58. Upper. 6 &7.
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59. Upper. 8
Bucc.aspect Ling.aspect
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60. Upp. 8
Occ.aspect
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61. Why upper.8???
The Occ. OutlineOcc. Outline is heart shapeheart shape as the
ling. Cusps are not well developed.
The 3 roots3 roots are fusedfused.
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62. Lower molars.Lower molars.
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63. Lower 6
Bucc.aspect Occ.aspect
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64. Lower 6
Bucc.aspect Occ.aspect
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65. Why lower 6???
Lingual over hang.
The MD width is longer than BLThe MD width is longer than BL
width.width.
The occ.occ. aspect has 5 cusps5 cusps.
The MBMB cusp is the largestlargest and the DD
cusp is the smallestsmallest.
2 developmental grooves2 developmental grooves on the bucc.bucc.
Aspect.Aspect.
2 roots.2 roots. 65

66. Lower 7
Bucc.aspect Occ.aspect
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67. Lower 7
Bucc.aspect Occ.aspect
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68. Why lower 7???
Only 4 cusps4 cusps in the occ. Aspectocc. Aspect.
OneOne developmental groovedevelopmental groove on the
bucc. Aspectbucc. Aspect.
Transverse ridge.
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69. Lower 6 &7.
Bucc.aspect Occ.aspect
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70. Lower 6&7.
Bucc.aspect Occ.aspect
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71. Lower 8
Bucc.aspect Ling.aspect
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72. Lower 8
Occ. aspect
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73. Why lower 8???
The occ. aspectocc. aspect is the samesame as lower 6.lower 6.
The 2 roots2 roots are fusedfused.
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74. Upper & lower 8.
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75. How to know if the tooth is
Right. Or Left.???”1”
You have to know the distaldistal and mesialmesial sides of the
tooth by…
…Roundation of angles (if incisors).Roundation of angles (if incisors).
…The contact areas position.contact areas position.
……The cusp slopes.The cusp slopes.
……The marginal ridges.The marginal ridges.
……Occ. Land mark “cusp”cusp”
……The direction of root.The direction of root.
…The cervical line curvaturecervical line curvature “the mesial is deeper”. NOT
important. 75

76. How to know if the tooth
is Right. Or Left.???”2”
Now hold the tooth in a correct
position…
… The bucc.bucc. is facing outsideoutside and the lingling.
is facing insideinside.
…The occ.occ. is downwarddownward if upp. toothupp. tooth or
upwardupward if lower tooth.lower tooth.
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77. How to know if the tooth
is Right. Or Left.???”3”
Hold the tooth with the mesial sidemesial side
you identified towardtoward the midlinemidline.
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78. ‫من‬ ‫لكل‬ ‫الشكر‬ ‫بخالص‬ ‫نتقدم‬‫من‬ ‫لكل‬ ‫الشكر‬ ‫بخالص‬ ‫نتقدم‬
‫وجزاهم‬ ‫العمل‬ ‫هذا‬ ‫فى‬ ‫شارك‬‫وجزاهم‬ ‫العمل‬ ‫هذا‬ ‫فى‬ ‫شارك‬
‫عليه‬ ‫خيرا‬ ‫ال‬‫عليه‬ ‫خيرا‬ ‫ال‬
‫يتقبل‬ ‫أن‬ ‫جميعا‬ ‫ال‬ ‫وندعو‬‫يتقبل‬ ‫أن‬ ‫جميعا‬ ‫ال‬ ‫وندعو‬
‫ميزان‬ ‫فى‬ ‫ويجعله‬ ‫منهم‬‫ميزان‬ ‫فى‬ ‫ويجعله‬ ‫منهم‬
‫ال‬ ‫شاء‬ ‫ان‬ ‫جميعا‬ ‫حسناتهم‬‫ال‬ ‫شاء‬ ‫ان‬ ‫جميعا‬ ‫حسناتهم‬
‫آمين‬ ‫اللهم‬‫آمين‬ ‫اللهم‬
‫تمانيتنا‬ ‫مع‬ ‫جميعا‬ ‫لكم‬ ‫وشكرا‬‫تمانيتنا‬ ‫مع‬ ‫جميعا‬ ‫لكم‬ ‫وشكرا‬
‫ان‬ ‫التوفيق‬ ‫و‬ ‫بالنجاح‬ ‫القلبية‬‫ان‬ ‫التوفيق‬ ‫و‬ ‫بالنجاح‬ ‫القلبية‬
‫ال‬ ‫شاء‬‫ال‬ ‫شاء‬
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79. Thank youThank you
&&
Best wishesBest wishes
Members of oral biology department.Members of oral biology department.
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80. Thank youThank you
80