FDI Tooth Identification Quiz

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Questions and Answers

What does the '+' symbol indicate in tooth identification?

  • An upper jaw tooth (correct)
  • The right side of the mouth
  • A lower jaw tooth
  • A deciduous tooth

How is a permanent tooth on the left side distinguished in the FDI notation?

  • The number 2 before the tooth number (correct)
  • A '-' sign before the tooth number
  • The number 1 before the tooth number
  • A '+' sign before the tooth number

How many teeth are accounted for by the last digit in the FDI numbering system (excluding wisdom teeth)?

  • 8 (correct)
  • 4
  • 16
  • 12

What does '21' represent in the FDI notation?

<p>Upper left permanent central incisor (C)</p> Signup and view all the answers

What is the primary structural unit of enamel?

<p>Enamel prism (rods) (B)</p> Signup and view all the answers

What does the absence of a zero before a single digit in the FDI notation signify?

<p>The tooth is a permanent tooth. (D)</p> Signup and view all the answers

What is the approximate inorganic composition of enamel?

<p>97-98% (C)</p> Signup and view all the answers

The notation '+13' represents which tooth?

<p>Upper Right Permanent Canine (A)</p> Signup and view all the answers

If a tooth is identified as '26', where is it located?

<p>Lower Left Permanent First Molar (B)</p> Signup and view all the answers

What is the material found between enamel prisms called?

<p>Interprismatic substance (A)</p> Signup and view all the answers

What are the incremental growth lines in enamel called?

<p>Striae of Retzius (A)</p> Signup and view all the answers

What are Perikymata?

<p>The external manifestations of the striae of Retzius (A)</p> Signup and view all the answers

What is the main component of hydroxyapatite crystals?

<p>Calcium, phosphate, and hydroxyl ions (A)</p> Signup and view all the answers

What process leads to the erosion of enamel?

<p>Demineralization (C)</p> Signup and view all the answers

Which tissue is formed throughout life?

<p>Dentine (D)</p> Signup and view all the answers

What is the typical shape of the mandibular first premolar's cross-section at the neck?

<p>Irregularly flattened mesiodistally (A)</p> Signup and view all the answers

How many roots and root canals does a mandibular second premolar usually have?

<p>1 root, 1 canal (A)</p> Signup and view all the answers

Which cusp is typically larger on a mandibular first premolar?

<p>Buccal (B)</p> Signup and view all the answers

What shape best describes the crown of mandibular molars?

<p>Square/rectangular with rounded corners (D)</p> Signup and view all the answers

How many roots and potential canals does a mandibular first molar have?

<p>2 roots, 2 or 3 canals (B)</p> Signup and view all the answers

Which root of the mandibular first molar is typically stronger and more massive?

<p>Mesial (A)</p> Signup and view all the answers

The distal root of the mandibular first molar often exhibits what characteristic?

<p>Distal bend (B)</p> Signup and view all the answers

How many roots and canals are typical for a mandibular second molar?

<p>2 roots, 2 or 3 canals (C)</p> Signup and view all the answers

Which cusp is typically the largest on a mandibular third molar?

<p>Mesiobuccal (D)</p> Signup and view all the answers

Where is the foramen coecum typically located on mandibular molars?

<p>Buccal surface (D)</p> Signup and view all the answers

What characteristic distinguishes a U-type fissure from a V-type fissure?

<p>Ease of cleaning (C)</p> Signup and view all the answers

What is a key indicator of caries spreading in dentin under a fissure?

<p>A dark shadow visible through the enamel (C)</p> Signup and view all the answers

Which type of fissure is more prone to developing carious lesions?

<p>V-type fissure (D)</p> Signup and view all the answers

What is the primary purpose of discoloration and alteration detection devices in dentistry?

<p>To diagnose caries (D)</p> Signup and view all the answers

What treatment is generally sufficient for caries confined to enamel?

<p>Fissure sealing (B)</p> Signup and view all the answers

What does FDI caries matrix combine?

<p>Many caries classification systems (A)</p> Signup and view all the answers

What does FDI stand for in the context of the content?

<p>Federation Dentaire Internationale (B)</p> Signup and view all the answers

Besides localization, what other factor does the classification of caries activity consider?

<p>Provides treatment (A)</p> Signup and view all the answers

What types of instruments are used for dentin preparation?

<p>Burrs (C)</p> Signup and view all the answers

What is necessary when caries reaches the dentin?

<p>Restorative therapies (D)</p> Signup and view all the answers

Which diamond bur is recommended for finishing preparations?

<p>Fine (B), Ultrafine (D)</p> Signup and view all the answers

What type of shank is commonly used for diamond burs?

<p>Friction grip (D)</p> Signup and view all the answers

What distinguishes a diamond bur designed for preparation from one for finishing?

<p>Diamond particle size (D)</p> Signup and view all the answers

What color code identifies a medium grit diamond bur?

<p>Blue (D)</p> Signup and view all the answers

Carbide burs are typically used for which of the following procedures?

<p>Amalgam filling removal (A)</p> Signup and view all the answers

What is the purpose of the color-coding system for diamond burs?

<p>Specifies the diamond particle size (D)</p> Signup and view all the answers

Which bur is NOT specifically mentioned as having a tapered shape?

<p>Long round diamond bur (C)</p> Signup and view all the answers

How does the number of cutting edges on a bur relate to the smoothness of the prepared surface?

<p>More cutting edges result in a smoother surface (A)</p> Signup and view all the answers

What is the function of a flat-end tapered diamond bur?

<p>Creating access cavities (D)</p> Signup and view all the answers

Which of the burs mentioned would likely be utilized for accessing and preparing narrow, deep areas in a tooth?

<p>Long needle diamond bur (C)</p> Signup and view all the answers

What is the critical pH for demineralization?

<p>6.2 (A)</p> Signup and view all the answers

What role does saliva play in remineralization?

<p>It supplies minerals, such as calcium and phosphate, to the tooth enamel. (A), It neutralizes acids produced by bacteria. (C)</p> Signup and view all the answers

What is the primary source of minerals for remineralization?

<p>Saliva (C)</p> Signup and view all the answers

How does fluoride enhance remineralization?

<p>It helps form fluoroapatite, which is more resistant to acids. (D)</p> Signup and view all the answers

What happens to enamel crystals during demineralization?

<p>They become thinner. (D)</p> Signup and view all the answers

What are two examples of cariogenic bacteria?

<p>Streptococcus mutans and Lactobacillus (A)</p> Signup and view all the answers

Which areas of the teeth are most susceptible to caries?

<p>Pits and fissures (C)</p> Signup and view all the answers

Which type of fissure is easiest to clean?

<p>U-type (A)</p> Signup and view all the answers

What factors influence the development of caries?

<p>Substrate, time, microorganisms, and host (B)</p> Signup and view all the answers

How does frequent snacking contribute to caries development?

<p>It provides more opportunities for bacteria to produce acid. (A)</p> Signup and view all the answers

What is formed on teeth in the presence of fluoride?

<p>Fluoroapatite (C)</p> Signup and view all the answers

What factors beside the key four, influence caries development?

<p>Genetics, fluoride concentration, the composition, sugar content, and frequency of the diet (C)</p> Signup and view all the answers

How does good oral hygiene prevent caries?

<p>It removes plaque and reduces the number of bacteria, minimizing acid production. (A)</p> Signup and view all the answers

What does bacteria in the mouth break down to produce acids?

<p>Sugars and carbohydrates (A)</p> Signup and view all the answers

How do acids produced by bacteria damage tooth enamel?

<p>They dissolve the mineral content of the tooth. (D)</p> Signup and view all the answers

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Flashcards

Mandibular First Premolar

A bicuspid tooth with one buccal and one lingual cusp, where the buccal cusp is larger.

Buccal Cusp

The larger, outer cusp of a mandibular first premolar, positioned towards the cheek.

Mandibular Second Premolar

A bicuspid tooth that may have 2 or 3 cusps, with one bigger buccal and one or two smaller lingual cusps.

Root Canal

The hollow space within the root of a tooth that contains pulp and nerves.

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Mandibular Molars

Large back teeth with two or more roots; known for their square shape with rounded corners.

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Foramen Coecum

An opening at the apex of a tooth root that allows for the passage of nerves and vessels.

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Mandibular First Molar

A stronger molar with two roots and 3-4 canals, commonly larger than the second molar.

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Distally Bent Roots

Roots that curve towards the back of the mouth in teeth like mandibular molars.

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Cross-section Characteristics

The shape observed in a cross-section, such as flattened mesiodistally for premolars.

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Cusp Shape Variations

Differences in shape and number of cusps between mandibular first and second premolars and molars.

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Demineralization

The process of losing minerals, weakening tooth structure.

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Enamel Composition

Enamel is composed of 97% inorganic material and 3% organic matter and water.

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Enamel Prisms

Basic structural units of enamel, made of hydroxyapatite crystals.

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Hydroxyapatite Crystals

The mineral form of calcium phosphate that makes up enamel.

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Striae of Retzius

Incremental growth lines in enamel that indicate periodic deposition during tooth development.

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Interprismatic Substance

Material found between enamel prisms, contributing to enamel's structure.

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Dentin

The layer beneath enamel, forming the bulk of a tooth.

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External Manifestations of Striae

Visible marks on the enamel surface that represent Retzius lines.

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Quadrants of Teeth

Teeth are organized into four quadrants: upper right, upper left, lower right, lower left.

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Permanent vs Deciduous

Permanent teeth replace deciduous teeth (baby teeth) as a person ages.

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Tooth Numbering System

Tooth positions are indicated using specific numbers for permanent and deciduous teeth.

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Upper vs Lower Teeth

Upper teeth refer to the maxillary arch, while lower teeth refer to the mandibular arch.

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Right vs Left Identification

Teeth identification includes determining whether they are on the left or right side of the mouth.

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Canine Tooth

The upper left permanent canine is the pointed tooth located in that quadrant.

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Tooth Position Notation

Notation includes the quadrant and the tooth number; numbers represent specific teeth.

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Mohlreiler Signs

Mohlreiler signs indicate positioning of teeth and their identification on left or right.

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Critical pH

The pH level below which demineralization occurs, generally under 5.5.

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Saliva's role

Saliva helps to supply essential minerals and buffer acids, aiding in enamel health.

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Streptococcus mutans

A type of bacterium in the mouth that metabolizes sugars and produces acids contributing to caries.

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Lactobacillus

A type of cariogenic bacterium that thrives in acidic environments and contributes to tooth decay.

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Cariogenic bacteria

Bacteria that promote the formation of cavities by producing acid when they metabolize sugars.

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Substrate

The food source that bacteria metabolize, often sugars and carbohydrates.

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Caries

A multifactorial disease characterized by the breakdown of tooth structure, leading to cavities.

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Fluoride's effect

Fluoride enhances remineralization and can form more acid-resistant minerals in enamel.

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Enamel crystals

Structured mineral formations in tooth enamel that can become thin and disorganized due to demineralization.

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Host factors

Characteristics of an individual, like saliva composition and flow rate, that influence caries development.

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Predilection areas

Specific regions in the mouth, such as pits and fissures, where caries are likely to develop due to less cleaning.

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Minimal oral hygiene

Poor oral cleaning habits that increase the risk of demineralization and cavities.

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Diamond Bur

A dental tool coated with diamond particles for cutting enamel.

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Friction Grip Shank

A type of connection for dental burs that holds them securely in place.

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Extra Coarse Diamond Particle Size

The largest diamond particle size, color coded black for heavy cutting.

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Coarse Diamond Particle Size

A diamond particle size categorized as green, used for significant enamel reduction.

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Medium Diamond Particle Size

Blue-coded particles for versatile preparation and smoothing.

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Fine Diamond Particle Size

Red-coded diamond particles meant for finishing and polishing surfaces.

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Extra Fine Diamond Particle Size

Super smooth finishing with color code yellow, for very delicate surfaces.

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Tapered Diamond Bur

A diamond bur shaped for access and precision in hard-to-reach areas.

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Large Flame Diamond Bur

A bur shaped like a flame, ideal for contouring and diminishing enamel.

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Cutting Edges for Finishing

Designed to provide smooth surfaces during specific finishing tasks.

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Type U fissures

Shallow and wide fissures potentially prone to decay.

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Type V fissures

Narrow and deep fissures where bacteria can thrive.

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Caries diagnostics

Methods used to detect and classify caries.

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Fissure sealing

A preventive treatment to fill and seal fissures.

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Enamel discoloration

Visual change in tooth enamel, indicating decay.

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Caries classification

Systems to categorize caries based on type and location.

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Differential diagnosis

Distinguishing between caries and other similar conditions.

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Manual instruments

Traditional tools for dental procedures that are less used now.

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Radiological checks

X-ray examinations used to assess tooth conditions.

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Occlusal surface

The top surface of the tooth used for chewing.

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Study Notes

Tooth Anatomy/Morphology

  • Teeth consist of the crown, neck, and root
  • The crown is the visible part of the tooth, covered by enamel
  • The neck is the constricted portion between the crown and root
  • The root is embedded in the alveolar bone
  • Deciduous teeth are 20 in total
  • Permanent teeth are 32 in total
  • 8 teeth per quadrant for both deciduous and permanent teeth
  • No premolars exist in deciduous teeth
  • No wisdom teeth in deciduous teeth
  • Permanent teeth have 3 molars in each quadrant, and 2 premolars

Tooth Numbering & Orientations

  • Adult humans have 32 permanent teeth (adults)
  • 20 deciduous (baby) teeth
  • 8 teeth exist in each quadrant (permanent and deciduous teeth)
  • Premolars exist only in permanent teeth
  • Wisdom teeth are the last molars to erupt

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