Dental Anatomy Quiz: Tooth Structure

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Questions and Answers

What does a point angle represent in dental anatomy?

The junction of three surfaces (correct)

A surface elevation

The junction of two surfaces

A cavity on the tooth surface

Which of the following is NOT considered a depressed landmark of the crown?

Pit

Fissures

Cusp (correct)

Developmental grooves

What is a lobe in the context of tooth development?

A section of tooth formation (correct)

A type of cavity

A type of enamel texture

A layer of dental pulp

Which of the following best describes a tubercle in dental anatomy?

A smaller elevation produced by enamel deposition Signup and view all the answers

Which feature marks the cervical third of an anterior tooth?

Cingulum Signup and view all the answers

How are line angles defined in dental anatomy?

Formed by the junction of two surfaces Signup and view all the answers

What is the main feature of mamelons?

They are rounded protuberances on the incisal ridge of incisors Signup and view all the answers

Which of the following describes ridges in dental anatomy?

Linear elevations of the tooth surface named by shape or location Signup and view all the answers

What shape describes a triangular fossa on the occlusal surface of posterior teeth?

Shallow pyramid shape Signup and view all the answers

In the Palmer notation system, how are permanent teeth identified in each quadrant?

By numbers 1 through 8 Signup and view all the answers

Which notation system starts at the right maxillary quadrant and progresses clockwise?

Two digit system or FDI system Signup and view all the answers

What notation is used for the right mandibular permanent incisor in the FDI system?

41 Signup and view all the answers

Which numbering starts from the right mandibular quadrant in the two digit system?

1 through 4 for permanent dentition Signup and view all the answers

What is the designation for the left maxillary permanent canine in the Universal Notation System?

12 Signup and view all the answers

In the Palmer notation system, what letters represent deciduous teeth?

A through E Signup and view all the answers

What numbering is assigned to the right maxillary second deciduous molar in the Universal Notation System?

A Signup and view all the answers

What is a marginal ridge?

A linear elevation forming the mesial and distal margins of teeth Signup and view all the answers

How is a transverse ridge formed?

By the union of two triangular ridges transversely Signup and view all the answers

Which ridge is specifically located on the cervical third of premolars and molars?

Cervical ridge Signup and view all the answers

What characterizes a supplemental groove?

A shallow linear depression not marking a line of fusion Signup and view all the answers

What is a fissure in dental terminology?

A deep cleft resulting from imperfect fusion of enamel Signup and view all the answers

Which ridge is formed by the middle lobe of the labial surface of canines?

Labial ridge Signup and view all the answers

What defines a sulcus in dentistry?

A long vally running between cusps with inclined surfaces Signup and view all the answers

Which ridge extends in mesial and distal directions from the cusp tip?

Cusp ridge Signup and view all the answers

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.