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By @enisyavuz

Deciduous Teeth Chronology

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Questions and Answers

What is the eruption sequence of deciduous teeth in the upper jaw?

A, B, C, D, E

What is the type of Primary First Molar tooth?

Three-cusp type with two buccal and one lingual cusps

What is the characteristic of the buccal surface of the Primary First Molar tooth?

It is very smooth with little evidence of developmental groove

What is the characteristic of the occlusal surface of the Primary First Molar tooth?

<p>It is scalloped with no definite cusp ridge form</p> Signup and view all the answers

What is the characteristic of the roots of the Primary First Molar tooth?

<p>They are thin and widely spread</p> Signup and view all the answers

What is the characteristic of the cervical line of the Primary First Molar tooth?

<p>It is convex towards the root</p> Signup and view all the answers

What is the characteristic of the MB cusp of the Primary First Molar tooth?

<p>It is large and sharp</p> Signup and view all the answers

What is the characteristic of the lingual aspect of the Primary First Molar tooth?

<p>It is very convex and narrow</p> Signup and view all the answers

What is the shape of the geometric outline of the maxillary second molar?

<p>Rectangular</p> Signup and view all the answers

What is the characteristic of the distal side of the crown?

<p>Narrower and shorter than the mesial side</p> Signup and view all the answers

Which roots are seen from the distal aspect?

<p>MB, LR, and DB roots</p> Signup and view all the answers

What is the characteristic of the DB cusp?

<p>Indistinct</p> Signup and view all the answers

How many supplemental grooves arise from the Mesial Triangular Fossa (MTF)?

<p>3</p> Signup and view all the answers

What is the characteristic of the Developmental Groove (DG) that connects 3 fossae?

<p>Central Developmental Groove (CDG)</p> Signup and view all the answers

How many pits are present on the occlusal surface?

<p>3</p> Signup and view all the answers

What is the resemblance of the Primary Maxillary Second Molar to?

<p>Permanent maxillary first molar</p> Signup and view all the answers

What is a distinct feature of the permanent maxillary first molar?

<p>It has roots that are noticeably shorter</p> Signup and view all the answers

What is a characteristic of the occlusal aspect of the permanent maxillary first molar?

<p>It has a rhomboidal shape with a flat B surface</p> Signup and view all the answers

What is present on the ML cusp of the permanent maxillary first molar?

<p>A tubercle of Carabelli</p> Signup and view all the answers

How many fossae are present on the occlusal aspect of the permanent maxillary first molar?

<p>4</p> Signup and view all the answers

What is unique about the shape of the mandibular first molar?

<p>It has a trapezoidal shape</p> Signup and view all the answers

What is characteristic of the buccal surface of the mandibular first molar?

<p>It has a convex surface</p> Signup and view all the answers

What is characteristic of the roots of the mandibular first molar?

<p>They are long, slender, and divergent</p> Signup and view all the answers

What is distinctive about the ML cusp of the mandibular first molar?

<p>It is larger, longer, and sharper than the other cusps</p> Signup and view all the answers

What is the primary difference in the size of the deciduous mandibular second molar compared to the first one?

<p>It is larger than the first one</p> Signup and view all the answers

How many roots does the deciduous mandibular second molar have?

<p>Two</p> Signup and view all the answers

What is the shape of the geometric outline of the occlusal surface of the deciduous mandibular first molar?

<p>Rectangular</p> Signup and view all the answers

What is the name of the cusp on the buccal surface of the deciduous first molar?

<p>MB, B, and DB</p> Signup and view all the answers

What is the primary characteristic of the deciduous mandibular first molar that differentiates it from the permanent mandibular first molar?

<p>Size</p> Signup and view all the answers

What can be said about the elevations and depressions on the deciduous mandibular second molar?

<p>They are identical to those on the permanent first molar</p> Signup and view all the answers

What is the shape of the outline form of the MMR?

<p>Rhomboidal</p> Signup and view all the answers

What is the characteristic of the cervical line on the MMR?

<p>It is nearly straight</p> Signup and view all the answers

Which cusp is the largest on the MMR?

<p>ML</p> Signup and view all the answers

What is the shape of the distal root of the MMR?

<p>Rounded and thinner</p> Signup and view all the answers

What is the characteristic of the buccal outline of the MMR crown?

<p>It is extremely convex at the cervical third</p> Signup and view all the answers

How many cusps are present on the MMR?

<p>4</p> Signup and view all the answers

What is the characteristic of the occlusal outline of the MMR?

<p>It is small and buccolingually</p> Signup and view all the answers

What is the characteristic of the depression on the MMR root?

<p>It is present on most of the length of the root</p> Signup and view all the answers

Study Notes

Deciduous Teeth

  • Deciduous teeth erupt in the following order:
    • Upper teeth: 7, 8, 18, 14, 24 months
    • Lower teeth: 6, 7, 16, 12, 20 months

Primary First Molar (Upper and Lower D)

  • Maxillary first molar:
    • Has a predecessor (4) that is different from the 6
    • Can have two types: four-cusp or three-cusp
    • Four-cusp type: two buccal and two lingual cusps
    • Three-cusp type: two buccal and one lingual cusp
  • Geometric outline: trapezoid
  • Buccal aspect:
    • Very smooth surface with little evidence of developmental groove
    • Occlusal surface is scalloped with no definite cusp ridge form
    • Large MB cusp and small DB cusp
    • Prominent cervical ridge with more prominence on the mesial half
  • Roots:
    • Three roots (MB, DB, and L) are thin and widely spread
    • No root trunk
    • Furcation is close to the cervical line
    • Distal root is shorter than the mesial root

Primary Maxillary Second Molar

  • Resembles the permanent maxillary first molar
  • Larger than the deciduous maxillary first molar
  • Roots are noticeably shorter
  • General differences between the permanent and deciduous posterior teeth:
    • Size
    • Color
    • Bulbous crown
    • Prominent cervical ridge
    • Thin and divergent roots
    • Absence of root trunk

Mandibular First Molar

  • Does not resemble any other deciduous or permanent teeth
  • Primitive appearance
  • Buccal aspect:
    • Trapezoid outline
    • Mesial contour of the crown is nearly straight
    • Distal side is convex and converges toward the cervix
    • MB cusp is much wider than DB cusp
    • No groove between them
  • Roots:
    • Long, slender, and widely spread
    • No root trunk
    • Furcation is close to the cervical line

Primary Mandibular Second Molar

  • Larger than the first molar
  • Smaller than the permanent mandibular first molar
  • Resembles the permanent mandibular first molar
  • General differences between the deciduous and permanent teeth:
    • Size
    • Color
    • Bulbous crown
    • Prominent cervical ridge
    • Thin and divergent roots
    • Absence of root trunk
  • However, there are differences between the deciduous and permanent mandibular first molars:
    • Number of cusps and roots
    • Elevations and depressions
    • Geometric outline of occlusal surface

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