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Questions and Answers
What is a prominent feature of the maxillary permanent lateral incisor's root?
Where is the mesial contact point located on the maxillary permanent lateral incisor?
Which feature is common in the lingual surface of the maxillary permanent lateral incisor?
Which of the following anomalies may be present in the central incisor?
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How do the incisal edges of the maxillary permanent lateral incisor typically appear?
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Which description best fits the maxillary permanent lateral incisor's distal outline?
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What might be a sign of dental trauma or decay associated with the upper left lateral incisor?
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In cases where the maxillary permanent lateral incisor is congenitally absent, which appearance might it sometimes show?
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Which is a characteristic feature of the maxillary permanent central incisor's crown when viewed labially?
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What is the primary feature of the root of the maxillary permanent central incisor?
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How does the mesial curvature of the cervical line (CEJ) of the maxillary permanent incisors compare to other teeth?
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In which view is the cingulum off-centered towards the distal on the maxillary permanent central incisor?
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Which surface feature is characteristic of the incisor's incisal view?
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What distinguishes the maxillary from the mandibular incisors?
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What common feature is observed in newly erupted maxillary incisors?
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Which of these angles is sharp in the labial view of the maxillary permanent central incisor?
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Which structure is crucial in identifying the lingual surface features of the maxillary permanent central incisor?
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What is a notable attribute of the maxillary incisors when viewed from the proximal?
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What is the shape of the crown of the maxillary permanent central incisor from the incisal aspect?
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Which feature is least likely to be found on the lingual surface of the maxillary permanent central incisor?
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Which statement is true regarding the dimensions of the maxillary permanent central incisor crown?
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Which of the following best describes the root of the maxillary permanent central incisor's taper?
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What is the primary characteristic of the mandibular permanent incisors compared to the maxillary incisors?
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Where do plaque and calculus tend to accumulate on the mandibular incisors?
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Which feature helps distinguish between the right and left mandibular lateral incisor?
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What is a characteristic feature of the mandibular central incisor crown?
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Which statement about the incisal edge of the mandibular lateral incisor is true?
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What characterizes the root of both the mandibular central and lateral incisors?
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Which of the following is NOT a defect commonly seen in incisors?
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What distinguishes the labial surface of the mandibular central incisor?
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Which aspect of the mandibular lateral incisor is generally considered more prominent?
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What is a notable characteristic of the cingulum of the mandibular lateral incisor?
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Study Notes
Permanent Maxillary and Mandibular Incisors
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Maxillary Permanent Central Incisor:
- The longest and widest anterior tooth.
- Wider mesio-distally (M-D) than facio-lingually (F-L).
- Sharp mesio-incisal angle and convex disto-incisal angle.
- One broad root that tapers in the apical third.
- Cervical dimension M-D is approximately equal to F-L.
- Labial surfaces are more rounded from the incisal aspect.
- The tooth tapers toward the lingual.
- The labial surface is convex.
- Cingulum is located off-center towards distal.
- Narrowest incisal embrasures.
- Deep lingual fossa.
- Mamelons (seen in newly erupted teeth) and developmental grooves.
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Maxillary Permanent Lateral Incisor:
- Smaller than Maxillary Central Incisor but similar in shape.
- Mesio-distal (M-D) is greater than facio-lingually (F-L).
- Incisal edge inclines toward the distal.
- Rounded incisal angles with the distal angle more convex.
- Distal outline is more convex compared to mesial.
- The root deviates to distal.
- Lingual pit is common.
- Lingual surface is the most concave of any incisors.
- Cingulum is very pronounced.
- The lingual fossa is more likely to have developmental grooves compared to the Maxillary Central Incisor.
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Mandibular Permanent Central Incisor:
- The smallest teeth of the permanent dentition.
- The labial aspect is smooth, regular, tapering evenly to the apical portion of the root.
- The incisal ridge is straight and at right angle to the long axis of the tooth.
- Broad root with furrows mesially and distally.
- Tip of the incisal edge is sitting lingual to the midline.
- The labial surface is flattened at the incisal 1/3, the middle 1/3 is more convex.
- The crown shows mamelons (newly erupted) and traces of developmental lines.
- The crown is narrower on the lingual surface than on the labial surface.
- They have a small convex, centered cingulum, subtle lingual fossa, and equally subtle marginal ridges.
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Mandibular Permanent Lateral Incisor:
- Slightly larger than the Mandibular Central Incisor.
- Has a small, distally placed cingulum.
- The greater height of the (CEJ) curvature on the mesial surface than on the distal surface distinguishes the right lateral incisor from the left lateral incisor.
- The mesial side of the crown is longer than the distal, causing the straight incisal edge to slope distally.
- The distal contact area is more toward the cervical than the mesial contact.
- The crown is slightly longer than the central incisor.
- The incisal edge is not at right angle to a line bisecting the crown and the root labio-lingually.
- The root is similar to the central incisor but considerably longer.
- The labio-lingual axes of 41&42 are almost parallel in the alveolar process.
Common Tooth Defects in Incisors
- Enamel Hypoplasia: Defects in enamel formation due to various factors.
- Amelogenesis Imperfecta: Genetic disorder affecting enamel formation, resulting in abnormal enamel structure.
- Mesiodent and Peg lateral: Extra teeth or abnormally shaped lateral incisors.
- Macrodontia and Microdontia: abnormally large or small teeth.
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Description
This quiz covers the characteristics and anatomy of the permanent maxillary and mandibular incisors. Students will learn about the distinctions between the central and lateral incisors, including their shapes, dimensions, and unique features. Perfect for dental students and professionals looking to test their knowledge on tooth morphology.
