Questions and Answers
What is the shape of the occlusal surface of lower molars?
How many roots do upper molars have?
What characteristic described the inclination of upper molar roots as they progress posteriorly?
Which statement accurately describes the positioning of the MB cusp of upper molars?
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What shape is typically associated with the occlusal surface of upper molars?
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What is the defining feature of the lower molars’ occlusal surface?
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What describes the roots of upper molars as they progress distally?
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Which term describes the convergence seen in upper molars?
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What shape is the occlusal surface of upper molars typically described as?
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Which element is commonly found on the medial cusp of upper molars?
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What type of roots do upper molars have?
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What is a unique characteristic of the occlusal surface of lower molars?
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Which statement regarding contact areas of lower molars is true?
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What does the term 'supplemental grooves' refer to in the context of molars?
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What occurs to the DL cusp in the case of upper molars?
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What can be said about the distal contact area in upper molars?
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What characteristic differentiates upper incisors from lower incisors in terms of width and thickness?
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Which feature is true for lower central incisors compared to lower lateral incisors?
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What is a notable characteristic of the upper central incisor's incisal edge?
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Which of the following describes the positioning of the cingulum in the lower lateral incisor?
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Which statement accurately depicts the difference between permanent and deciduous anterior teeth?
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What is the typical root apex shape for an upper central incisor compared to a lower lateral incisor?
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Which feature describes the angles of the upper lateral incisor?
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Which characteristic of the lower incisors is typically seen from the proximal aspect?
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Which characteristic differentiates upper deciduous incisors from their permanent successors?
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What is true regarding the incisal ridge of lower deciduous incisors?
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How does the crown of deciduous canines compare to permanent canines?
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Which statement is accurate regarding the incisal edge of lower deciduous incisors?
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In the comparison of upper and lower deciduous incisors, which is a true statement?
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What distinguishes the distal slope of upper deciduous canines from that of permanent canines?
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Which feature is specific to the anatomy of lower deciduous incisors?
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What is a characteristic feature of lower molars?
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What is NOT a feature of deciduous incisors compared to their permanent counterparts?
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Which of the following statements about deciduous molars is true?
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What is the primary difference between the roots of upper and lower deciduous molars?
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What distinguishes the mesial contact area of lower molars?
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What feature differentiates the occlusal surfaces of deciduous molars from permanent molars?
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Which of the following correctly describes the roots of upper deciduous molars?
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How do the sizes of deciduous molars compare to permanent molars?
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What is a defining characteristic of the mesial cusp of upper deciduous molars?
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Study Notes
Natural Teeth Identification
Permanent Incisors
- Upper incisors: Width (mesiodistal) is greater than thickness (buccolingual).
- Lower incisors: Thickness (buccolingual) surpasses width (mesiodistal).
- Upper central incisor is wider and has a straight incisal edge; lower lateral incisor is thinner with a curved incisal edge.
- Upper lateral incisor features rounded mesial and distal incisal angles; central incisor has sharp mesial angle.
- Root apex of upper central incisor is blunt and centralized; upper lateral incisor has a pointed, distally curved root apex.
Deciduous vs Permanent Anteriors
- Deciduous teeth are generally smaller, whiter, have a constricted cervix, and exhibit enamel bulge close to the cervical line.
- Unique traits of deciduous incisors include no mamelons and thicker relation to crown length compared to permanent successors.
- Distinctions between upper central and lateral incisors: upper central is larger than lateral.
Permanent Canines
- Upper canines appear wider and shorter with a transverse ridge; lower canines are narrower and longer with H or U-shaped appearance.
- Upper canines have two triangular fossae (snake eyes); lower canines possess no mesial lingual developmental groove.
Permanent Molars
- Upper molars possess a rhomboidal or heart-shaped occlusal surface; lower molars have a hexagonal or rectangular shape.
- Upper molars display three roots while lower molars have two.
- Roots of lower molars are typically more mesially inclined compared to the upper molars.
General Differences in Molars
- Deciduous molars are smaller, whiter, and have constricted cervix; they display shallow elevations and depressions.
- Upper deciduous molars have widths greater than thickness; lower deciduous molars exhibit the opposite.
- First and second upper and lower deciduous molars have distinct cervical ridges and maintain criteria associated with upper and lower molars respectively.
Contact Areas
- Contact areas can be flat and may present as shiny, caries, or discolored.
- In upper molars, no distal contact area may be present; contact areas can also be fused in certain cases.
- There is a mesial contact area in lower molars but often no distal contact area; roots may be fused and widely divergent.
Crown Characteristics
- Upper central incisors have centralized cingulum; lower incisors have a distally shifted cingulum.
- Deciduous incisors have incisal edges centered labiolingually; permanent immature teeth feature cingulum inclined distally.
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Description
Test your knowledge on identifying permanent incisors and their distinctions from deciduous teeth. This quiz covers specific features, sizes, and characteristics of various types of teeth, emphasizing key differentiators between upper and lower incisors, as well as canines.
