Deciduous Teeth Morphology II Quiz

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Questions and Answers

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

It does not resemble any other tooth (correct)

It resembles the permanent first molar

It has a smaller size compared to the deciduous second molar

It has a similar shape to the deciduous second molar

What is a characteristic of the buccal surface of the Deciduous Maxillary first molar?

The MD is much greater than the crown height (correct)

The MD is smaller than the crown height

The curvature of the CL is uniform

The cervical ridge is not prominent

What is a feature of the occlusal surface of the Deciduous Maxillary first molar?

It exhibits similarity to the permanent molar

It has a rhomboid shape

It has a four-cusped shape

It exhibits some similarity to maxillary premolar (correct)

How many cusps are present on the Deciduous Maxillary first molar?

Four Signup and view all the answers

What is the shape of the crown outline of the Deciduous Maxillary first molar?

Unusual five-sided figure Signup and view all the answers

What is a characteristic of the transverse ridge on the Deciduous Maxillary first molar?

It is very prominent Signup and view all the answers

What is a feature of the cervical ridge on the Deciduous Maxillary first molar?

It is prominent, especially the mesial portion Signup and view all the answers

What is the arrangement of the fossae on the Deciduous Maxillary first molar?

A well-defined central fossa, mesial and distal triangular fossae Signup and view all the answers

What is a consequence of the thinner enamel and dentin in primary teeth?

Increased risk of pulp exposure during cavity preparation Signup and view all the answers

Why is it important to understand the morphology of primary teeth?

Both A and B Signup and view all the answers

What is the significance of the prominent cervical ridge in crown preparation?

It provides resistance in crown placement Signup and view all the answers

Why do the roots of deciduous molars require more caution during extraction?

They flare more than permanent teeth Signup and view all the answers

What is a consequence of premature loss of deciduous molars?

Malocclusion may occur due to shortage of space Signup and view all the answers

What is the purpose of placing a space maintainer?

To reserve space for the future permanent tooth Signup and view all the answers

What is the primary similarity between the maxillary deciduous second molar and the maxillary permanent first molar?

They closely resemble each other in appearance Signup and view all the answers

What is unique about the maxillary deciduous second molar compared to the first maxillary deciduous molar?

It has a fifth cusp (cusp of carabelli) Signup and view all the answers

Which of the following is a characteristic of the mandibular deciduous first molar?

It has a prominent MB cervical bulge Signup and view all the answers

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

Rectangular Signup and view all the answers

What is the order of the cusps from largest to smallest in the deciduous mandibular first molar?

MB > ML > DB > DL Signup and view all the answers

What is a characteristic of the deciduous mandibular second molar?

It has 5 cusps Signup and view all the answers

What is a difference between the deciduous mandibular second molar and the mandibular permanent first molar?

The length of the M root Signup and view all the answers

What is the general resemblance between the deciduous mandibular second molar and the mandibular permanent first molar?

They closely resemble each other in appearance Signup and view all the answers

Study Notes

Deciduous Molars Morphology

Deciduous first molars are smaller than the deciduous second molar, unlike permanent teeth.
Deciduous first molars have a unique shape and do not resemble any other tooth.

Maxillary First Molar (D)

The crown does not resemble any other primary or permanent molar crown, but has similarities to permanent premolars.
The buccal surface has:
- Mesiodistal (MD) dimension much greater than the crown height
- Curvature of the CL, greater towards the mesial than the distal, making the crown appear offset towards the mesial
- A prominent cervical ridge, especially the mesial portion (Prominent MB cervical bulge)
The occlusal surface:
- Exhibits some similarity to maxillary premolars
- Has a general shape of an unusual five-sided figure
- The crown outline converges lingually and distally
There are four cusps:
- ML cusp (bulkiest and longest)
- DL cusp (smallest, and sometimes absent)
- MB cusp is of greater proportions than the DB cusp
The transverse ridge is very prominent (ML & MB)
There is a well-defined central fossa, mesial and distal triangular fossae

Maxillary Second Molar (E)

Resembles the maxillary permanent first molar in appearance
Larger than the first maxillary deciduous molar
Has a fifth cusp (cusp of Carabelli)

Mandibular First Molar (D)

Does not resemble any other teeth, deciduous or permanent
Has 4 cusps
Has 2 roots like other mandibular molars
Prominent MB cervical bulge
The occlusal surface:
- The crown is wider MD than BL
- Somewhat rectangular in shape
- The four cusps, from largest to smallest in size, are (MB > ML > DB > DL)
- The two mesial cusps are considerably larger than the distal cusps
- Transverse ridge (ML & MB)
- Central fossa, mesial and distal triangular fossae

Mandibular Second Molar (E)

Resembles the mandibular permanent first molar in appearance
Has 5 cusps
Can be differentiated from the permanent first molar by:
- General differences between deciduous and permanent teeth
- The three cusps on the buccal surface of the deciduous first molar are of nearly equal size
- The occlusal table is narrower BL and less pentagonal than the permanent first molar
- The M root is longer and wider than the D root in the deciduous tooth

Clinical Considerations

The thickness of enamel and dentin in primary teeth is less than in permanent teeth, making the pulp chamber close to the external surface
Understanding tooth morphology is important for restoration and identification
The prominent cervical ridge must be considered in crown preparation
The roots of deciduous molars flare more than permanent teeth, requiring more caution during extraction
Premature loss of deciduous molars can lead to malocclusion and space maintenance is crucial

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Test your knowledge on the morphology of deciduous teeth, including deciduous first and second molars, and their unique characteristics.