Deciduous Upper Second Molar: Buccal, Lingual, And Occlusal Anatomy

Deciduous Upper Second Molar: Buccal, Lingual, And Occlusal Anatomy

Describe in distal about Primary Maxillary Second Molar.
Answer:

Primary Maxillary Second Molar Buccal aspect:

• It shows two well-defined buccal cusps with a buccal developmental groove between them.
• The crown is narrow at the cervix.
• The roots appear slender and longer.
• The point of bifurcation between the buccal roots is close to the cervical line.
• The two buccal cusps are nearly equal in size.

Primary Maxillary Second Molar Lingual aspect:

• It shows three cusps.
• Mesiolingual cusp – large.
• Distolingual – well-developed.
• Supplemental cusp=apical to mesiolingual cusp called tubercle of carabelli.
• It is poorly developed.
• It acts as a buttress to the bulk of the mesiolingual cusp.
• If it is missing, some traces of developmental lines or “dimples” remain.
• A well-defined development groove separates the mesiolingual cusp from the distolingual cusp.
• It connects with the developmental groove.
• All three roots are visible.
• The lingual root is large and thick.

Primary Maxillary Second Molar Mesial aspect:

• The mesiolingual cusp appears large.
• The mesiobuccal cusp is short and sharp.
• Little curvature to the cervical line is seen.
• The mesiobuccal root is broad and flat.
• The lingual root appears long and slender.
• The point of bifurcation between the mesiobuccal root and the lingual root is 2-3 mm apical to the cervical line of the crown.
• The mesiolingual cusp is below the bifurcation.
• Cervical curvature is lingual.

Primary Maxillary Second Molar Distal aspect:

• A lingual outline creates a smooth, rounded line.
• Distobuccal and distolingual cusp are of the same length.
• The cervical line is straight.
• All three roots are seen.
• The distobuccal root is shorter and narrower.
• The point of bifurcation between the distobuccal root and lingual root is more apical.

Primary Maxillary Second Molar Occlusal aspect:

• It is somewhat rhomboidal.
  • It shows 4 cusps.
  • Mesiobuccal.
  • Distobuccal
  • Mesiolingual
  • Distolingual
• Supplemental cusps.
  • The buccal surface is flat with a developmental groove.
  • Occlusal surface has.
  • A central fossa with a central pit.
  • A well-defined mesial triangular fossa is distal to the mesial marginal ridge.
  • The oblique ridge connects the mesiolingual and distobuccal cusp.
• Central groove connecting mesial triangular fossa with the central fossa.
• Buccal developmental groove.
• Extends buccally from the central pit.
  • Separates triangular ridges.
  • Lingual developmental groove.
• Separates mesiolingual and distolingual cusps.
• Supplemental grooves.
• • Radiates from developmental grooves.
• Distal fossa- distal to oblique ridge.
• Distal triangular fossa.
  • Mesial to the distal marginal ridge.