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Buccal Aspect
 Crown Shape
 The crowns of mandibular molars are wider mesiodistally than high cervico-
occlusally (greatest extent on first molars)
 Second Molar Cusps
 Four cusps are present on lower second molars
 Two cusps are present on buccal aspect
 MB cusp is usually wider mesiodistally than the DB cusp
 The lingual cusp tips are usually visible from the buccal aspect
 Grooves Of The Second Molar
 The buccal groove separates the MB cusps from the DB cusp
 May end in the middle of the buccal surface in a pit
1st molar 2nd molar
 Proximal Contacts
 Same as all molars
 Mesial: Junction of the occlusal and middle thirds
 Distal: Middle third of crown
 Cervical Line
 CEJ is nearly straight across the buccal surface on lower first and second molars
 Occasionally a point of enamel will dip down nearly into the root bifurcation
 Can also have this type of projection on the lingual, this could lead to periodontal
problems
 Variations In Mandibular Molar Crowns
 The distal cusp is absent one fifth of the time
 A four-cusp molar may not always be a second molar - rely on tooth position to
aid in determination
Enamel projection
 Both mandibular first and second molars
have two roots (one mesial and one distal)
 Both roots are nearly twice as long as the crown
 Crown Shape From The Lingual
 Mandibular first and second molar crowns taper to the lingual
 This lingual taper is more evident in first molars
 The lingual cusps are longer and more pointed than the buccal cusps
 Crown Shape From The Lingual
 The mesiolingual cusp is usually longer and wider (slightly) than the distolingual cusp
 Grooves
 The lingual groove separates the mesiolingual cusp from the distolingual cusp
 Terminates in the occlusal third with no pit
Lingual Aspect #30
ML DL
 Cervical Line
 The CEJ is relatively flat mesiodistally
 Can dip cervically between the roots over the bifurcation
(similar to buccal)
 A depression can be seen between the cervical line and the
bifurcation
 Crown Shape From The Proximal
 Appear relatively short occlusocervically compared to
faciolingual dimension
 The crowns are tilted lingually on the root base
 The buccal outline is convex in the cervical third
 Crest Of Curvature
 The height of contour on the buccal surface is within the
cervical third
 On molars this buccal bulge is called the buccal cervical ridge
 It is more prominent on second molar than first molars
 Cusp Height
 The lingual cusps are more conical and pointed than the buccal
 They are the largest of the four to five cusps
 Distal Tilt
 Due to the distal tilt of the crown and the sloping of the occlusal surface, most of the
occlusal surface and all cusps can be seen from the distal
 Taper To The Distal
 On both first and second molars the crown is more narrow on the distal than the mesial
 Can see some of the buccal and lingual surface from the distal due to this taper
 Cervical Line
 The mesial CEJ of both first and second molars slopes occlusally from buccal to lingual
 The distal cervical line is nearly straight
 Marginal Ridges
 The mesial marginal ridge is concave buccolingually
 Usually longer on first molars than second and
V-shaped on the second
Proximal Aspect
Mesial Aspect
1st molar 2nd molar
Distal Aspect
1st molar 2nd molar
 Shape: Rectangular Or Pentagon
 The second molar is roughly rectangular
 The two mesial cusps are larger than the two distal cusps
 Taper To The Distal And Lingual
 The crown is narrower buccolingually on the distal than the mesial
 The crown is narrower mesiodistally on the lingual than the facial
 The widest portion of the crown of a second molar buccolingually is opposite the
mesial cusps
Occlusal Aspect
D M
Occlusal Aspect
1st molar 2nd molar
 Ridges
 On both first and second molars the MB and ML cusp’s triangular ridges
form a transverse ridge
 The same is true for the DB
and DL cusps
 Since lingual cusps are taller, they possess longer triangular ridges than the
buccal
 Fossae
 Mandibular molars possess three fossae, a large central fossa, a smaller mesial,
and the smallest distal fossa
 Each or all may possess a pit
 Grooves: Second Molar
 Groove is simpler than first and resembles a cross
 Central groove is straighter than that of the first molar
 Buccal and lingual grooves are usually continuous
Mandibular
Third Molars
 Shape And Relative Size
 Shortest of mandibular teeth
 Crown may resemble a first or second molar
 Generally have bulbous crowns
#32 Buccal
#32 Distal
Mandibular
Third Molars
 Distal Tip
 The crown tips distally and the distal half of the
crown is noticeably shorter
Mandibular
Third Molars
 Cusp Size
 Lingual cusps are the longest and largest, with ML
being biggest
 Grooves
 Irregular groove pattern with multiple supplemental
grooves
Mandibular
Third Molars
 Roots
 The two roots tend to be short and are often fused
 If the roots are separate the root trunk will be long
 Can possess one or more extra roots
#32 Lingual #32 Mesial

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Unit 8 - Mandibular 2nd Molars.pptx

  • 1.
  • 2.
  • 3.
  • 4. Buccal Aspect  Crown Shape  The crowns of mandibular molars are wider mesiodistally than high cervico- occlusally (greatest extent on first molars)  Second Molar Cusps  Four cusps are present on lower second molars  Two cusps are present on buccal aspect  MB cusp is usually wider mesiodistally than the DB cusp  The lingual cusp tips are usually visible from the buccal aspect  Grooves Of The Second Molar  The buccal groove separates the MB cusps from the DB cusp  May end in the middle of the buccal surface in a pit 1st molar 2nd molar
  • 5.  Proximal Contacts  Same as all molars  Mesial: Junction of the occlusal and middle thirds  Distal: Middle third of crown  Cervical Line  CEJ is nearly straight across the buccal surface on lower first and second molars  Occasionally a point of enamel will dip down nearly into the root bifurcation  Can also have this type of projection on the lingual, this could lead to periodontal problems  Variations In Mandibular Molar Crowns  The distal cusp is absent one fifth of the time  A four-cusp molar may not always be a second molar - rely on tooth position to aid in determination Enamel projection
  • 6.  Both mandibular first and second molars have two roots (one mesial and one distal)  Both roots are nearly twice as long as the crown
  • 7.  Crown Shape From The Lingual  Mandibular first and second molar crowns taper to the lingual  This lingual taper is more evident in first molars  The lingual cusps are longer and more pointed than the buccal cusps  Crown Shape From The Lingual  The mesiolingual cusp is usually longer and wider (slightly) than the distolingual cusp  Grooves  The lingual groove separates the mesiolingual cusp from the distolingual cusp  Terminates in the occlusal third with no pit Lingual Aspect #30 ML DL
  • 8.  Cervical Line  The CEJ is relatively flat mesiodistally  Can dip cervically between the roots over the bifurcation (similar to buccal)  A depression can be seen between the cervical line and the bifurcation
  • 9.  Crown Shape From The Proximal  Appear relatively short occlusocervically compared to faciolingual dimension  The crowns are tilted lingually on the root base  The buccal outline is convex in the cervical third  Crest Of Curvature  The height of contour on the buccal surface is within the cervical third  On molars this buccal bulge is called the buccal cervical ridge  It is more prominent on second molar than first molars  Cusp Height  The lingual cusps are more conical and pointed than the buccal  They are the largest of the four to five cusps
  • 10.  Distal Tilt  Due to the distal tilt of the crown and the sloping of the occlusal surface, most of the occlusal surface and all cusps can be seen from the distal  Taper To The Distal  On both first and second molars the crown is more narrow on the distal than the mesial  Can see some of the buccal and lingual surface from the distal due to this taper  Cervical Line  The mesial CEJ of both first and second molars slopes occlusally from buccal to lingual  The distal cervical line is nearly straight  Marginal Ridges  The mesial marginal ridge is concave buccolingually  Usually longer on first molars than second and V-shaped on the second Proximal Aspect
  • 13.  Shape: Rectangular Or Pentagon  The second molar is roughly rectangular  The two mesial cusps are larger than the two distal cusps  Taper To The Distal And Lingual  The crown is narrower buccolingually on the distal than the mesial  The crown is narrower mesiodistally on the lingual than the facial  The widest portion of the crown of a second molar buccolingually is opposite the mesial cusps Occlusal Aspect D M
  • 15.  Ridges  On both first and second molars the MB and ML cusp’s triangular ridges form a transverse ridge  The same is true for the DB and DL cusps  Since lingual cusps are taller, they possess longer triangular ridges than the buccal
  • 16.  Fossae  Mandibular molars possess three fossae, a large central fossa, a smaller mesial, and the smallest distal fossa  Each or all may possess a pit  Grooves: Second Molar  Groove is simpler than first and resembles a cross  Central groove is straighter than that of the first molar  Buccal and lingual grooves are usually continuous
  • 17. Mandibular Third Molars  Shape And Relative Size  Shortest of mandibular teeth  Crown may resemble a first or second molar  Generally have bulbous crowns #32 Buccal #32 Distal
  • 18. Mandibular Third Molars  Distal Tip  The crown tips distally and the distal half of the crown is noticeably shorter
  • 19. Mandibular Third Molars  Cusp Size  Lingual cusps are the longest and largest, with ML being biggest  Grooves  Irregular groove pattern with multiple supplemental grooves
  • 20. Mandibular Third Molars  Roots  The two roots tend to be short and are often fused  If the roots are separate the root trunk will be long  Can possess one or more extra roots #32 Lingual #32 Mesial