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Questions and Answers
What morphological feature distinguishes deciduous incisors from permanent incisors?
What morphological feature distinguishes deciduous incisors from permanent incisors?
Which characteristic is NOT typically associated with deciduous canines?
Which characteristic is NOT typically associated with deciduous canines?
How do deciduous molars compare to permanent molars in terms of size?
How do deciduous molars compare to permanent molars in terms of size?
What anatomical feature of the roots is typically found in deciduous teeth?
What anatomical feature of the roots is typically found in deciduous teeth?
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Which of the following statements accurately describes cervical ridges in deciduous teeth?
Which of the following statements accurately describes cervical ridges in deciduous teeth?
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What is the primary reason for the broader appearance of deciduous molars?
What is the primary reason for the broader appearance of deciduous molars?
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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?
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What overall size difference is observed between deciduous and permanent teeth?
What overall size difference is observed between deciduous and permanent teeth?
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What is a characteristic feature of incisors in deciduous dentition?
What is a characteristic feature of incisors in deciduous dentition?
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Which statement accurately describes the characteristics of canines in deciduous dentition?
Which statement accurately describes the characteristics of canines in deciduous dentition?
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How are deciduous molars classified compared to permanent molars?
How are deciduous molars classified compared to permanent molars?
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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?
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Which tooth type is absent in deciduous dentition?
Which tooth type is absent in deciduous dentition?
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Which characteristic differentiates the upper central incisor from its permanent counterpart?
Which characteristic differentiates the upper central incisor from its permanent counterpart?
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Which feature distinguishes maxillary incisors from mandibular incisors in deciduous dentition?
Which feature distinguishes maxillary incisors from mandibular incisors in deciduous dentition?
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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?
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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?
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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?
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What is a fundamental difference between deciduous and permanent molars?
What is a fundamental difference between deciduous and permanent molars?
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Which of the following accurately describes the deciduous first molars?
Which of the following accurately describes the deciduous first molars?
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What distinguishing feature do deciduous molars have compared to their permanent successors?
What distinguishing feature do deciduous molars have compared to their permanent successors?
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Which statement about the morphology of deciduous canines is accurate?
Which statement about the morphology of deciduous canines is accurate?
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What is a common characteristic of the enamel in deciduous teeth?
What is a common characteristic of the enamel in deciduous teeth?
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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?
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Study Notes
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
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But often only three cusps or sometimes only two cusps
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Mesiolingual cusp is largest, squat appearance from the buccal.
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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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Description
Explore the intricacies of deciduous dentition, focusing on tooth morphology, classification, and differences between deciduous and permanent teeth. This quiz covers the emergence, retention, and size variations of various tooth types, enhancing your understanding of dental anatomy.
