Podcast
Questions and Answers
What morphological feature distinguishes deciduous incisors from permanent incisors?
What morphological feature distinguishes deciduous incisors from permanent incisors?
- Deciduous incisors are narrower mesiodistally
- Deciduous incisors are longer
- Deciduous incisors have a thicker incisal edge
- Deciduous incisors have a more bulbous appearance (correct)
Which characteristic is NOT typically associated with deciduous canines?
Which characteristic is NOT typically associated with deciduous canines?
- Shorter root length
- More rounded cusp
- Thinner enamel
- Larger size compared to molars (correct)
How do deciduous molars compare to permanent molars in terms of size?
How do deciduous molars compare to permanent molars in terms of size?
- Deciduous molars are smaller in all dimensions
- Deciduous molars have a more complex root structure
- Deciduous molars are larger than the permanent premolars (correct)
- Deciduous molars are wider than permanent molars
What anatomical feature of the roots is typically found in deciduous teeth?
What anatomical feature of the roots is typically found in deciduous teeth?
Which of the following statements accurately describes cervical ridges in deciduous teeth?
Which of the following statements accurately describes cervical ridges in deciduous teeth?
What is the primary reason for the broader appearance of deciduous molars?
What is the primary reason for the broader appearance of deciduous molars?
In terms of root resorption, what occurs to deciduous teeth as they approach exfoliation?
In terms of root resorption, what occurs to deciduous teeth as they approach exfoliation?
What overall size difference is observed between deciduous and permanent teeth?
What overall size difference is observed between deciduous and permanent teeth?
What is a characteristic feature of incisors in deciduous dentition?
What is a characteristic feature of incisors in deciduous dentition?
Which statement accurately describes the characteristics of canines in deciduous dentition?
Which statement accurately describes the characteristics of canines in deciduous dentition?
How are deciduous molars classified compared to permanent molars?
How are deciduous molars classified compared to permanent molars?
What is a notable difference in root anatomy between deciduous and permanent teeth?
What is a notable difference in root anatomy between deciduous and permanent teeth?
Which tooth type is absent in deciduous dentition?
Which tooth type is absent in deciduous dentition?
Which characteristic differentiates the upper central incisor from its permanent counterpart?
Which characteristic differentiates the upper central incisor from its permanent counterpart?
Which feature distinguishes maxillary incisors from mandibular incisors in deciduous dentition?
Which feature distinguishes maxillary incisors from mandibular incisors in deciduous dentition?
What is the typical number of primary teeth found in one quadrant of the mouth?
What is the typical number of primary teeth found in one quadrant of the mouth?
What is true about the roots of deciduous molars compared to anterior teeth?
What is true about the roots of deciduous molars compared to anterior teeth?
How do the enamel rods of deciduous teeth differ from those of permanent teeth?
How do the enamel rods of deciduous teeth differ from those of permanent teeth?
What is a fundamental difference between deciduous and permanent molars?
What is a fundamental difference between deciduous and permanent molars?
Which of the following accurately describes the deciduous first molars?
Which of the following accurately describes the deciduous first molars?
What distinguishing feature do deciduous molars have compared to their permanent successors?
What distinguishing feature do deciduous molars have compared to their permanent successors?
Which statement about the morphology of deciduous canines is accurate?
Which statement about the morphology of deciduous canines is accurate?
What is a common characteristic of the enamel in deciduous teeth?
What is a common characteristic of the enamel in deciduous teeth?
Which of the following is a notable feature of the anterior teeth in deciduous dentition?
Which of the following is a notable feature of the anterior teeth in deciduous dentition?
Flashcards
Deciduous Dentition
Deciduous Dentition
The set of 20 primary teeth. Also called milk teeth.
Primary Teeth
Primary Teeth
Another name for deciduous teeth.
Heterodont Dentition
Heterodont Dentition
Having different types of teeth (incisors, canines, premolars, molars).
Monophyodont
Monophyodont
Having a single set of teeth
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Diphyodont
Diphyodont
Having two sets of teeth
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Permanent Dentition
Permanent Dentition
The set of teeth that replace the primary teeth.
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Mesiodistal Crown Diameters
Mesiodistal Crown Diameters
The distance from the front to the back of a tooth's crown. Includes maxilla and mandible differences.
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Tooth Morphology
Tooth Morphology
The shape and structure of teeth.
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Deciduous teeth emergence time
Deciduous teeth emergence time
Deciduous teeth typically appear between 6 months and 2.5 years of age.
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Deciduous molar lifespan
Deciduous molar lifespan
Some deciduous molars can be retained until the age of 12-13 years.
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Deciduous tooth size (general)
Deciduous tooth size (general)
Generally smaller than permanent teeth, except deciduous molars, which are larger than the premolars they replace.
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Leeway space
Leeway space
The difference in size between deciduous molars and the premolars that replace them, providing space for permanent teeth.
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Exfoliation
Exfoliation
The natural process of losing deciduous teeth due to root resorption.
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Deciduous tooth crown shape
Deciduous tooth crown shape
Wider mesiodistally (front-to-back) compared to their height, making anterior teeth appear cup-shaped and molars squat.
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Cervical ridges (deciduous)
Cervical ridges (deciduous)
More prominent in deciduous teeth, giving them a bulbous appearance. Enamel is thicker, and abruptly stops at the cervical region.
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Deciduous tooth function
Deciduous tooth function
Crucial for mastication (chewing), speech, jaw growth, space maintenance, aesthetics, and even as a "weapon".
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Deciduous Tooth Roots
Deciduous Tooth Roots
Anterior teeth have narrow, long roots. Molar roots are longer, slender, and flare to accommodate premolars. There's no root trunk.
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Deciduous Cusps
Deciduous Cusps
Cusps are more pointed, but wear down quickly. Enamel is thinner, more opaque, and even, resulting in a whiter appearance.
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Deciduous Enamel Rods
Deciduous Enamel Rods
Directed occlusally at the cervical area for deciduous teeth, but towards the root for permanent teeth.
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Deciduous Incisor Shape
Deciduous Incisor Shape
Smaller than permanent incisors; larger mesiodistal diameter than crown height. Cup-shaped or bulbous with smooth labial surfaces and straight incisal edges.
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Deciduous Second Molar Similarity
Deciduous Second Molar Similarity
Similar in morphology to the permanent first molars.
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Deciduous First Molar Uniqueness
Deciduous First Molar Uniqueness
Midway between premolars and molars in morphology.
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Anterior Deciduous Tooth Similarity
Anterior Deciduous Tooth Similarity
Incisors and canines resemble their permanent counterparts in morphology.
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Deciduous Molar Root Flare
Deciduous Molar Root Flare
Molar roots flare (spread out) more to accommodate the development of premolars.
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Deciduous Dentition
- Tooth morphology of incisors, canines, and molars
- Features on incisal/occlusal, labial/buccal, mesial, and distal surfaces
- Similarities and differences between tooth types
- Size differences between similar teeth in the maxilla and mandible
- Morphologies of deciduous and permanent dentition similarities/differences
Classification of Deciduous Teeth
- Morphology
- Homodont: all teeth same morphology
- Heterodont: teeth have different morphology
- Sets of Teeth
- Monophyodont: one set of teeth
- Diphyodont: two sets of teeth
- Polyphyodont: multiple sets of teeth
Deciduous Tooth Emergence and Retention
- Teeth emerge between 6 months and 2.5 years of age
- Deciduous molars may be retained until 12-13 years of age
- Natural loss of deciduous teeth is exfoliation
Morphological Differences between Deciduous and Permanent Teeth
- Deciduous teeth are smaller (except molars which are larger than premolars)
- Leeway space is the difference in size that allows permanent teeth to develop
- Cusp shapes – more pointed in deciduous than permanent teeth
- Enamel thickness and appearance
- Pulp horns of deciduous teeth are more prominent
Crowns and Roots of Deciduous Teeth
- Crowns are wider mesiodistally compared to their height
- Anterior teeth appear cup-shaped, molars squat
- Cervical ridges are more prominent in deciduous causing a bulbous appearance
- Anterior roots are narrower and comparatively longer, while molar roots flare more to accommodate developing premolars
- No root trunk in deciduous teeth
Enamel Rods of Deciduous Teeth
- Enamel rods of deciduous teeth are directed occlusally in the cervical area
- Enamel rods of permanent teeth are directed towards the root
Upper Central Incisor (Deciduous)
- Smaller than permanent tooth
- Increased mesiodistal diameter which is greater than crown height
- Cup-shaped, bulbous crown
- Smooth labial surface, straight incisal edge
- Well-defined marginal ridges, large cingulum
- Constricted at the neck
- Sharp mesioincisal angle, rounded distoincisal angle
- Root tilts distally
Upper Lateral Incisor (Deciduous)
- Smaller than central, especially mesiodistally
- Cingulum not as prominent
- Rounded distoincisal angle
- Not variable in shape compared to permanent incisors
Upper Canine (Deciduous)
- Diamond shaped
- Cusp is very pointed (more than permanent canines)
- Cervical bulge
- Mesial and distal cusp slopes (longer mesial)
- Lingual characteristics: cingulum, mesial and distal marginal ridges; incisal ridges, lingual ridge
- Root tapers lingually and distally
Lower Central Incisor (Deciduous)
- Smallest tooth
- Bilaterally symmetrical
- Lingual surface flatter than uppers
- Cervical constriction
- Bulge on labial and lingual
- Single root, tapering
Lower Lateral Incisor (Deciduous)
- Larger than lower central
- Not symmetrical
- Incisal edge follows line of arch, distal twist
- Rounded distoincisal angle
- Single root
Lower Canine (Deciduous)
- Smaller, slimmer than upper
- Crown height greater than mesiodistal diameter
- Distal cusp slope longer than mesial
- Lingual ridge and marginal ridges not as pronounced
Upper First Molar (Deciduous)
-
Occlusal divided into buccal and lingual halves by a central groove
-
Generally described as having four cusps
- mesiobuccal, distobuccal, mesiolingual, distolingual
-
But often only three cusps or sometimes only two cusps
-
Mesiolingual cusp is largest, squat appearance from the buccal.
-
Pronounced bulge on the mesial side of the buccal surface
Upper Second Molar (Deciduous)
- Morphologically like permanent first molar
- Smaller than permanent first molar but larger than deciduous first molar
- Roots more slender and diverge compared with permanent molars
- Prominent bulge on cervical part of buccal surface
- Four cusps, oblique ridge etc., like permanent first molar
Lower First Molar (Deciduous)
- Four cusps, two buccal and two lingual, with mesiolingual largest
- Joining the two mesial cusps is a ridge of enamel called the buccolingual crest.
- Pronounced cervical bulge (tubercle of Zuckerkandl)
General Findings of Deciduous Teeth.
- Incisors and canines are similar to permanent teeth
- Deciduous second molars are similar to permanent first molars
- Deciduous first molars are unique, in between the premolars and molars
Additional Notes.
- Deciduous tooth differences are important in paedodontics, particularly in stainless steel crown treatments and pulpotomies.
- The concept of leeway space is important in orthodontics.
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