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Questions and Answers
What does a point angle represent in dental anatomy?
Which of the following is NOT considered a depressed landmark of the crown?
What is a lobe in the context of tooth development?
Which of the following best describes a tubercle in dental anatomy?
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Which feature marks the cervical third of an anterior tooth?
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How are line angles defined in dental anatomy?
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What is the main feature of mamelons?
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Which of the following describes ridges in dental anatomy?
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What shape describes a triangular fossa on the occlusal surface of posterior teeth?
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In the Palmer notation system, how are permanent teeth identified in each quadrant?
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Which notation system starts at the right maxillary quadrant and progresses clockwise?
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What notation is used for the right mandibular permanent incisor in the FDI system?
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Which numbering starts from the right mandibular quadrant in the two digit system?
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What is the designation for the left maxillary permanent canine in the Universal Notation System?
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In the Palmer notation system, what letters represent deciduous teeth?
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What numbering is assigned to the right maxillary second deciduous molar in the Universal Notation System?
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What is a marginal ridge?
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How is a transverse ridge formed?
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Which ridge is specifically located on the cervical third of premolars and molars?
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What characterizes a supplemental groove?
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What is a fissure in dental terminology?
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Which ridge is formed by the middle lobe of the labial surface of canines?
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What defines a sulcus in dentistry?
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Which ridge extends in mesial and distal directions from the cusp tip?
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Study Notes
Line Angles
- Formed by the junction of two surfaces
- Examples: Mesio-buccal, Disto-lingual
Point Angles
- Formed by the junction of three surfaces
- Examples: Mesio-libo-incisal, Disto-lingo-incisal
Divisions Into Thirds
- Tooth crown and root can be divided into thirds from the labial aspect
- Divisions are horizontal and vertical
- Proximal view, in a vertical direction, can also be divided into thirds
Anatomical Landmarks Of The Crown
Elevated Landmarks
-
Dental lobe: Primary sections of tooth development
- Mamelon: Rounded protrusion on incisal ridge of newly erupted incisors
- Cingulum: Lingual lobe of anterior teeth, makes up the bulk of the cervical third
- Cusp: Primary elevation on posterior teeth occlusal third and canine incisal third
- Tubercle: Smaller elevation on the crown, caused by localized enamel deposition
-
Ridges: Linear elevations on the tooth surface
- Marginal ridge: Forms mesial and distal margins of posterior occlusal surfaces and lingual surfaces of anterior teeth
- Triangular ridge: Extends from the cusp tip towards the central portion of posterior tooth occlusal surface
- Transverse ridge: Union of two triangular ridges transversely
- Oblique ridge: Union of two triangular ridges obliquely
- Cusp ridge: Linear elevation extending mesially and distally from the cusp tip
- Cervical ridge: Linear elevation on the cervical third of the buccal surface of premolars and molars
- Labial ridge: Linear elevation formed by the middle lobe of the labial surface of canines
- Buccal ridge: Linear elevation formed by the middle lobe of the buccal surface of premolars
- Lingual ridge: Linear elevation on the lingual surface of canines extending from the cingulum to the cusp tip
- Incisal ridge: Linear elevation formed by the incisal portion of a newly erupted anterior tooth
Depressed Landmarks
- Developmental groove: Deep linear depression on the occlusal surface, indicating the line of fusion of primary lobes
- Supplemental groove: Shallow linear depression on the occlusal surface, representing a branch of the developmental groove
- Sulcus: Long, tent-shaped space between the cusps on the occlusal surface
- Fissure: Deep cleft or defect on the occlusal or buccal surfaces, caused by imperfect enamel fusion where developmental grooves are present
-
Fossa: Small depression or concavity on the lingual surface of anterior teeth and occlusal surfaces of posterior teeth
- Central fossa: Broad, deep angular valley in the central portion of the occlusal surface of a mandibular molar
- Lingual fossa: Broad, shallow depression on the lingual surface of an incisor or canine.
- Triangular fossa: Shallow pyramid-shaped depression on the occlusal surface of posterior teeth.
Notation Systems
- Systems designed to identify the type and location of each tooth in the dental arches
-
Palmer notation system: Each quadrant has a designation
- Deciduous teeth use letters A through E
- Permanent teeth use numbers 1 through 8
-
Two digit system or FDI system: Based on numbering quadrants in a clockwise direction
- Permanent dentition: 1 through 4
- Deciduous dentition: 5 through 8
-
Universal Notation System: Uses letters or numbers to represent teeth, not based on median line of the cross.
- Permanent dentition: uses numbers 1 through 8
- Deciduous dentition: uses letters A through K
- Example 11: left maxillary permanent canine
- Example K: left mandibular deciduous second molar
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Description
Test your knowledge on dental anatomy, focusing on line angles, point angles, and divisions into thirds of the tooth crown and root. This quiz will also explore elevated landmarks such as dental lobes, mamelons, cingulum, and cusps. Brush up on your understanding of tooth structure and anatomical features.
