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05. Maxillary Molars (CD) - Dentition
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05. Maxillary Molars (CD) - Dentition

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  • 1. Surface Anatomy of Maxillary Permanent Molars
  • 2. BUCCAL PALATAL OCCLUSAL MESIAL DISTAL
  • 3. BUCCAL SURFACE * The geometric outline: Trapezoidal with the small uneven side present cervically * Outline form : D Mesial outline: Nearly straight till the contact area at the junction of the occlusal and middle 1/3 Distal outline: Convex till the contact area at the middle 1/3 M
  • 4. Occlusal outline: presenting mesio-buccal & disto-buccal cusps. D Cervical outline: Irregular and slightly convex toward the root M
  • 5. Surface anatomy: * Convex buccal surface with the crest of curvature at the cervical 1/3 representing Cervical ridge. D *Buccal groove may terminate by buccal pit. Mesio-buccal cusp is broader, shorter and less sharp than the disto-buccal cusp M
  • 6. P The Roots: * Root trunk: 4 millimeters DB MB *3 roots are seen from the buccal surface which are widely diverge . * The axis of the roots are inclined D distally * Deep developmental groove extend on root trunk M
  • 7. LINGUAL SURFACE * It is the reverse of the buccal surface with No lingual convergence Mesial outline: Nearly straight and form with the mesial slope of the ML cusp M Distal outline: Convex and form semicircle with the distal slope of the DL cusp D
  • 8. Occlusal outline: ML cusp is the largest and longest cusp. DL cusp is spheroidal M Cervical outline: Irregular and slightly convex toward the root D
  • 9. Surface anatomy: *Convex lingual surface with the crest of curvature at the middle 1/3. *Tubercle of Carabelli is found on the lingual surface of ML cusp. *Lingual developmental groove ends with palatal pit . M D
  • 10. MESIAL SURFACE The geometric outline: Trapezoidal with small uneven side occlusally. Buccal outline: * Convex with the B maximum convexity at the cervical 1/3 denoting cervical ridge. Concave at the middle 1/3 denoting the* termination of the buccal developmental .groove Convex at the occlusal 1/3 representing* .circumscribed MB cusp L
  • 11. Lingual outline: * Convex with the crest of curvature at the middle 1/3. B * The lingual outline dips inward to illustrate the tubercle. L
  • 12. Occlusal outline: * Represented by ML , MB cusps * Irregular MMR which curve cervically. Cervical outline: Irregular and convex occlusally Anatomical landmarks Mesial contact area at the junction between middle and occlusal 1/3, buccal to the center
  • 13. DISTAL ASPECT MESIAL ASPECT *Distal Convergence * Wider mesial surface *Convex distal surface * Flat mesial surface * Mesial marginal ridge *Distal MR curved less curved cervically Continue
  • 14. MESIAL ASPECT DISTAL ASPECT MB P P DB *Straight cervical line *Cervical line convex occlusally *Root trunk= 5mm *Root trunk = 3mm *3 roots are seen *2 roots are seen
  • 15. OCCLUSAL SURFACE The geometric outline: B D M Rhomboidal. L > B & M > D surfaces. Note : * Disto-buccal convergence. * ML, BD angles are obtuse. *MB, DL angles are acute .The ML & DB cusps are found at the obtuse angles. L
  • 16. B Anatomical landmarks: Elevations: *4 cusps with 4 triangular ridges and D tubercle.The ML is the largest cusp followed by MB,then DL and lastly DB which is the smallest cusp. Oblique ridge between ML&DB* .triangular ridges MMR and DMR* M L
  • 17. B Anatomical landmarks: Depression: D M (major fossae ( central and distal 2* Minor fossae ( mesial and distal 2* (.triangular fossae *Developmental grooves (Buccal, Central, transverse groove of oblique ridge, Distal oblique groove and Lingual groove(. L
  • 18. Pulp cavity☻ ►Pulp Chamber: The pulp chamber is broader Bucco-lingually than mesio.distally There is pulp horn beneatheach cusp - The floor is apical to the cervical line.
  • 19. Pulp cavity☻ :Root Canals► -3 main root canals. -MB root may have 2 root canals Note: Cervical cross section: Rhomboidal Mid root section: MB root canal ( Oval- Kidney( DB root canal (Round-Oval( P root canal ( Round- Oval(
  • 20. Enumerate the names of the following ?elevations and depression DMR-1 Oblique ridge-2 Distal linear fossa-3 Central fossa- 4 Buccal groove- 5 Mesial triangular fossa- 6 Lingual groove- 7
  • 21. PALATAL BUCCAL OCCLUSAL MESIAL DISTAL
  • 22. BUCCAL SURFACE 6 7 M D D M in 7 the crown is smaller, narrower & shorter .The MB cusp is larger and longer than DB cusp ,the roots are close & parallel .The root trunk is longer than in 6
  • 23. LINGUAL SURFACE 6 7 D M D *The crown converge lingually.The DL cusp is smaller in 7 .It may be missed ( 3 - cusp type) No cusp of carabelli in 7 *
  • 24. MESIAL SURFACE 7 D 6 M * No cusp of carabelli in 7 MB and P roots in 7 are confines within the* BL outlines of the crown D
  • 25. DISTAL ASPECT Distal Convergence * ** Convex distal surface ***Distal MR curved cervically B L
  • 26. OCCLUSAL ASPECT B B D M L cusp type 4 outline typical to 6 Disto- lingual convergence No tubercle of carabelli M L cusp type 3 shape typical to 8 No disto-lingual cusp, No lingual or distal oblique grooves
  • 27. Pulp cavity☻ ►Pulp Chamber: The pulp chamber is broader Bucco-lingually than mesio.distally There is pulp horn beneatheach cusp - The floor is apical to the cervical line.
  • 28. Pulp cavity☻ :Root Canals► -3 main root canals. -MB root may have 2 root canals Note: Cervical cross section: Rhomboidal Mid root section: MB root canal ( Oval- Kidney) DB root canal (Round-Oval) P root canal ( Round- Oval)
  • 29. PALATAL BUCCAL OCCLUSAL MESIAL DISTAL
  • 30. BUCCAL SURFACE MB cusp is wider and longer than DB cusp The roots are often fused making one large short root
  • 31. LINGUAL ASPECT Usually one large lingual cusp without lingual groove
  • 32. MESIAL SURFACE Characterized by fusion of the roots and the bifurcation in the apical 1/3
  • 33. DISTAL SURFACE Convex surface with no* contact area *The distal surface short and narrow. So most of the occlusal surface is seen.
  • 34. OCCLUSAL ASPECT cusp type 3 shape is typical to 7 No disto-lingual cusp, No lingual or distal oblique grooves cusp type 4 outline typical to 6 There are disto- lingual cusp, Lingual groove .and oblique ridge
  • 35. OCCLUSAL SURFACE :Notes The occlusal surface of 8 has- 1 numerous supplemental grooves The pulp cavity showed great- 2 variation in the size and shape The pulp chamber of 8 is larger than- 3 other molars because it is younger than other molars by 9-11 years