16 Questions
What is a characteristic of the crowns of deciduous anterior teeth?
Wider mesiodistally in comparison with their crown length
What is a difference between the roots of deciduous and permanent molars?
Deciduous molar roots are relatively more slender and longer
What is a characteristic of the pulp cavities in primary teeth?
A thick layer of dentin and large pulp chambers
Why do the roots of deciduous molars fare out more apically?
To provide more room for the development of permanent teeth crowns
What is a difference between the cervical ridge of deciduous and permanent teeth?
The cervical ridge is more prominent in deciduous teeth
Why are the roots of deciduous anterior teeth narrow and long?
Because of their proportion to crown width and length
What is the reason the two lingual cusps are visible?
They are taller cusps
What is the shape of the buccal cusp?
Flat
What is the location of the point of bifurcation lingually?
4 mm apical to the cervical line
What is the characteristic of the mesial outline of the crown from the lingual aspect?
Convex from the cervical line to the contact area
How much longer are the roots measured lingually than buccally?
1 mm
What is the shape of the geometric outline of the mandibular first molar when viewed from the buccal aspect?
Trapezoidal with a small uneven side present cervically
Which of the following is true about the mesial outline of the mandibular first molar when viewed from the buccal aspect?
It is concave till the contact area at the junction of the occlusal and middle 1/3
What is the number of roots of the mandibular first molar?
Tworoots, one mesial and one distal
Which of the following cusps is the largest, widest, and highest of the three facial cusps of the mandibular first molar?
Mesiobuccal cusp
What is the characteristic of the facial cervical line of the mandibular first molar?
It is nearly straight
Study Notes
Deciduous Anterior Teeth
- Crowns are wider mesiodistally in comparison with their crown length than permanent teeth.
- Cervical ridge is more prominent labially and lingually.
- Roots are narrow and longer in comparison with crown width and length.
Deciduous Posterior Teeth
- Cervical ridge is more prominent buccally on maxillary and mandibular first molars.
- Buccal and lingual surfaces of the crown are flatter coronally to the cervical curvature.
- Roots are relatively more slender and longer than those of permanent molars.
- Roots have a short root trunk and flare out more apically, allowing more room for development of permanent teeth crowns.
Pulp Cavities
- Enamel layer is relatively thin.
- Thick layer of dentin between the pulp chambers and enamel, especially in primary mandibular second molar.
- Pulp chambers and pulp horns are relatively large and high in proportion to those of permanent teeth.
Morphology of Deciduous Molars
- Two lingual cusps are visible and taller.
- Cervical ridge is present at the cervical 1/3.
- Roots are twice the length of the crown.
- Axis of the roots is inclined distally.
- Root trunk is 3 mm deep with a developmental groove and depression.
Lingual Aspect
- Three cusps are visible: two lingual and the lingual portion of the distal cusp.
- The two lingual cusps are pointed, and the cusp ridges are high enough to hide the two buccal cusps from view.
- Mesial outline is convex from the cervical line to the marginal ridge.
- Distal outline is straight from the cervical line to the contact area.
- Mesiolingual cusp is the widest mesiodistally, with its cusp tip somewhat higher than the distolingual cusp.
- Lingual developmental groove separates the two lingual cusps and extends for a short distance on the lingual surface.
Mandibular Molars
- Mandibular molars are the biggest teeth in the mandibular arch.
- They have two broad roots for superior anchorage.
- Crown is wider mesiodistally than buccolingually.
Mandibular Permanent First Molar
- Crown is shorter cervico-occlusally than that of anterior teeth but bigger in every other dimension.
- It is the largest tooth in the mandibular arch.
- It has five cusps: two buccal, two lingual, and one distal.
- It has two roots: one mesial and one distal.
- Buccal aspect: geometric outline is trapezoidal with a small uneven side present cervically.
This quiz explores the distinct characteristics of deciduous and permanent teeth, including crown shape, root structure, and other key features. Test your knowledge of dental anatomy and development. Learn about the differences in anterior and posterior teeth and how they impact operative procedures.
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