Dental Anatomy Quiz: Deciduous and Permanent Teeth
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Questions and Answers

How does the thickness of enamel in deciduous teeth compare to permanent teeth?

Deciduous teeth have thinner enamel of uniform thickness, whereas permanent teeth have thicker enamel of varying thickness.

What is a key difference in the dentin of deciduous and permanent teeth?

Deciduous teeth have thin dentin of variable thickness, while permanent teeth have thick dentin of uniform thickness.

How does the cementum of deciduous teeth differ from that of permanent teeth?

Deciduous teeth have relatively thin cementum, while permanent teeth have thicker cementum that becomes even thicker in the apical region of the root.

What is a characteristic of the pulp chamber in deciduous teeth compared to permanent teeth?

<p>The pulp chamber is relatively large in deciduous teeth compared to the size of the crown, whereas it is smaller in permanent teeth.</p> Signup and view all the answers

How do the horns in deciduous teeth differ from those in permanent teeth?

<p>In deciduous teeth, the horns extend more occlusally and are closer to the enamel, whereas in permanent teeth, they are not placed as high.</p> Signup and view all the answers

What is a distinctive feature of the pulp canal in deciduous teeth compared to permanent teeth?

<p>The pulp canal is wider in deciduous teeth compared to the root width, whereas it is narrower in permanent teeth.</p> Signup and view all the answers

How does the apical foramen of deciduous teeth compare to that of permanent teeth?

<p>The apical foramen is wider in deciduous teeth, whereas it is narrower and more constricted in permanent teeth.</p> Signup and view all the answers

What is a general difference between deciduous and permanent teeth?

<p>Deciduous teeth are smaller and less calcified, with thinner enamel and dentin, whereas permanent teeth are larger and more calcified, with thicker enamel and dentin.</p> Signup and view all the answers

How do the sizes of deciduous teeth compare to their permanent counterparts, with one exception?

<p>Deciduous teeth are generally small when compared with their permanent counterpart, except in the case of deciduous molars, which are larger when compared with their permanent counterpart (premolars).</p> Signup and view all the answers

What is the primary difference in placement of deciduous teeth versus permanent teeth in the jaw?

<p>Deciduous teeth are placed perpendicular in relation to the jaws, while permanent teeth are placed oblique in relation to the jaws.</p> Signup and view all the answers

How does the shape of deciduous teeth compare to permanent teeth?

<p>Deciduous teeth are more bulbous as the cervix of the tooth shows marked constriction between the crown and the root.</p> Signup and view all the answers

What is the primary difference in crown morphology between deciduous and permanent teeth?

<p>The crown of deciduous teeth is wider mesiodistally in comparison with their crown length, while the length of the crown of permanent teeth is more when compared with their mesiodistal width.</p> Signup and view all the answers

What is the characteristic of the labial outline of deciduous teeth?

<p>The labial outline is flat from the cervical ridge 'crest of curvature' to the incisal surface.</p> Signup and view all the answers

How does the cingulum of deciduous teeth compare to permanent teeth?

<p>The cingulum is prominent in deciduous teeth, while it is less prominent in permanent teeth.</p> Signup and view all the answers

What is the primary difference in root formation between deciduous and permanent teeth?

<p>Root formation is not specifically discussed in this text, but it is an important aspect of tooth development.</p> Signup and view all the answers

What is the process by which deciduous teeth are replaced by permanent teeth?

<p>The process is not specifically discussed in this text, but it is referred to as the 'shedding process'.</p> Signup and view all the answers

What is the primary difference in the length of the root between deciduous and permanent teeth?

<p>The roots of deciduous teeth are shorter, slender, and thinner, while the roots of permanent teeth are longer and stronger.</p> Signup and view all the answers

How do the roots of deciduous anterior teeth differ in inclination from those of permanent teeth?

<p>The roots of deciduous anterior teeth have a slight labial inclination of up to 10°, whereas the roots of permanent teeth do not show any labial inclination.</p> Signup and view all the answers

What is the significance of the furcation level in deciduous molars compared to permanent teeth?

<p>The level of furcation in deciduous molars is near the cervical line, whereas in permanent teeth it is about 3-4 mm from the cervix or more apically placed.</p> Signup and view all the answers

Why do the roots of deciduous molars flare beyond the mesiodistal and buccolingual outline of the crown?

<p>The roots of deciduous molars flare to allow space for the development of the permanent tooth crown.</p> Signup and view all the answers

What is the main difference in the crown-to-root ratio between deciduous and permanent teeth?

<p>The roots of deciduous teeth are proportionally longer when compared to the crown size, whereas the roots of permanent teeth are not as long as the crown size.</p> Signup and view all the answers

How do the root trunks of deciduous molars differ from those of permanent teeth?

<p>The root trunk of deciduous molars is not distinct, whereas the root trunk of permanent teeth is long and distinct.</p> Signup and view all the answers

Flashcards

Deciduous Enamel

Thin, uniform, less calcified enamel in baby teeth, making them more permeable.

Permanent Enamel

Thick, varying in thickness, and more calcified enamel in adult teeth, making them less permeable.

Deciduous Dentin

Thin, variable dentin in baby teeth.

Permanent Dentin

Thick, uniform dentin in adult teeth.

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Deciduous Cementum

Thin cementum in baby teeth.

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Permanent Cementum

Thick cementum in adult teeth, thickens apically.

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Deciduous Pulp Chamber

Large pulp chamber in proportion to the crown size in baby teeth

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Permanent Pulp Chamber

Small pulp chamber in proportion to the crown size in adult teeth.

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Deciduous Pulp Canal

Wide pulp canal in proportion to the root width.

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Permanent Pulp Canal

Narrower pulp canal in proportion to the root width.

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Deciduous Apical Foramina

Wide apical foramina in baby teeth

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Permanent Apical Foramina

Narrow, constricted apical foramina in adult teeth.

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Deciduous Tooth Size

Generally smaller than permanent teeth, except for deciduous molars.

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Permanent Tooth Size

Larger than deciduous teeth, except for premolars.

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Deciduous Tooth Placement

Placed perpendicular to the jaw.

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Permanent Tooth Placement

Placed oblique to the jaw.

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Deciduous Crown Morphology

More bulbous with a marked cervical constriction in baby teeth.

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Permanent Crown Morphology

Less bulbous with a less pronounced cervical constriction in adult teeth.

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Study Notes

Histological Structure

  • Enamel in deciduous teeth is thin, uniform, and less calcified, making it more permeable.
  • Enamel in permanent teeth is thick, varying in thickness, and more calcified, making it less permeable.
  • Dentin in deciduous teeth is thin and variable in thickness.
  • Dentin in permanent teeth is thick and uniform in thickness.
  • Cementum in deciduous teeth is relatively thin.
  • Cementum in permanent teeth is relatively thick and becomes thicker in the apical region of the root.

Pulp Chamber and Canal

  • The pulp chamber in deciduous teeth is large compared to the crown size.
  • The pulp chamber in permanent teeth is relatively small compared to the crown size.
  • The pulp canal in deciduous teeth is wider compared to the root width.
  • The pulp canal in permanent teeth is narrower compared to the root width.
  • The apical foramina in deciduous teeth are wide.
  • The apical foramina in permanent teeth are narrow and constricted.

Tooth Size and Placement

  • Deciduous teeth are generally smaller than their permanent counterparts, except for deciduous molars.
  • Permanent teeth are generally larger than their deciduous counterparts, except for premolars.
  • Deciduous teeth are placed perpendicular to the jaws.
  • Permanent teeth are placed oblique to the jaws.

Crown Morphology

  • Deciduous teeth have a more bulbous shape with a marked cervical constriction.
  • Permanent teeth have a less bulbous shape with a less pronounced cervical constriction.
  • The crown of deciduous teeth is wider mesiodistally compared to its crown length.
  • The crown of permanent teeth is longer compared to its mesiodistal width.
  • The labial outline of deciduous teeth is flat from the cervical ridge to the incisal surface.
  • The labial outline of permanent teeth is convex from the cervical ridge to the incisal surface.
  • The cingulum is prominent in deciduous teeth.
  • The cingulum is less prominent in permanent teeth.

Root Morphology

  • The roots of deciduous teeth are shorter, slender, and thinner.
  • The roots of permanent teeth are longer and stronger.
  • The roots of deciduous teeth are proportionally longer compared to the crown size.
  • The roots of permanent teeth are not as long as the crown size.
  • The roots of deciduous anterior teeth have a slight labial inclination of up to 10°.
  • The roots of permanent teeth do not show any labial inclination.
  • The level of furcation of deciduous teeth is near the cervical line or more apically placed.
  • The level of furcation of permanent teeth is about 3-4 mm from the cervix.
  • The root trunk of deciduous molars is not distinct.
  • The root trunk of permanent teeth is long and distinct.
  • The roots of deciduous molars flare beyond the mesiodistal and buccolingual outline of the crown.
  • The roots of permanent teeth do not flare and are within the boundaries of the crown.

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Test your knowledge of the histological structure of deciduous and permanent teeth, including enamel thickness and calcification.

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