Podcast
Questions and Answers
What is the definition of luminescence?
What is the definition of luminescence?
Which type of dental gypsum possesses the highest expansion?
Which type of dental gypsum possesses the highest expansion?
What does the 'coefficient of thermal conductivity' (k) represent?
What does the 'coefficient of thermal conductivity' (k) represent?
What is the significance of the contact angle of water in hydrophilic materials?
What is the significance of the contact angle of water in hydrophilic materials?
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What is characteristic of the Vickers hardness test?
What is characteristic of the Vickers hardness test?
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What property of a material allows it to let light pass through it?
What property of a material allows it to let light pass through it?
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Which of the following components is primarily used for impression plaster in dentistry?
Which of the following components is primarily used for impression plaster in dentistry?
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Which type of dental material is designed to remain in the oral cavity for an extended period?
Which type of dental material is designed to remain in the oral cavity for an extended period?
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What does the Rockwell hardness test measure using the HRB scale?
What does the Rockwell hardness test measure using the HRB scale?
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What is the significance of the value in terms of color perception?
What is the significance of the value in terms of color perception?
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During the measurement of gypsum setting time, what is the purpose of the Gilmore needles?
During the measurement of gypsum setting time, what is the purpose of the Gilmore needles?
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What type of dental stone is classified as modified α-hemihydrate calcium sulfate?
What type of dental stone is classified as modified α-hemihydrate calcium sulfate?
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What occurs at high temperatures resulting in the creation of vacancies in materials?
What occurs at high temperatures resulting in the creation of vacancies in materials?
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What is the primary component of type IV dental stone?
What is the primary component of type IV dental stone?
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What is the term used to describe the maximum stress that can be maintained without failure over an infinite number of cycles?
What is the term used to describe the maximum stress that can be maintained without failure over an infinite number of cycles?
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What is the definition of 'impact strength' in dental materials?
What is the definition of 'impact strength' in dental materials?
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Which of the following correctly describes the function of the Vicat needle?
Which of the following correctly describes the function of the Vicat needle?
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What are the biological properties of dental materials classified into?
What are the biological properties of dental materials classified into?
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Which of the following best describes the setting time of gypsum?
Which of the following best describes the setting time of gypsum?
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Which factors can influence the fatigue of materials?
Which factors can influence the fatigue of materials?
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Which hardness test is characterized by using a steel ball or diamond cone to measure penetration depth?
Which hardness test is characterized by using a steel ball or diamond cone to measure penetration depth?
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The term 'Knoop hardness' (KHN) refers to what?
The term 'Knoop hardness' (KHN) refers to what?
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What type of materials are classified as electric conductors?
What type of materials are classified as electric conductors?
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What happens to the setting time when the water-to-powder (W/P) ratio increases?
What happens to the setting time when the water-to-powder (W/P) ratio increases?
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Which statement accurately describes 'imbibition'?
Which statement accurately describes 'imbibition'?
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What is the term for the specific type of photo-luminescence where materials emit light only during excitation?
What is the term for the specific type of photo-luminescence where materials emit light only during excitation?
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What is the definition of thermal conductivity?
What is the definition of thermal conductivity?
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Who is known as the 'father of modern dentistry'?
Who is known as the 'father of modern dentistry'?
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How many forms of CaSO4 hemihydrate exist?
How many forms of CaSO4 hemihydrate exist?
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What is the main component of model plaster?
What is the main component of model plaster?
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Which test is considered a cyclic test?
Which test is considered a cyclic test?
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What does the W/P ratio indicate?
What does the W/P ratio indicate?
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Which of the following is NOT a type of reflection of light?
Which of the following is NOT a type of reflection of light?
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Which material is known to be an effective electric insulator?
Which material is known to be an effective electric insulator?
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What is meant by the term 'plasticity' in materials?
What is meant by the term 'plasticity' in materials?
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Which test measures the initial set of gypsum?
Which test measures the initial set of gypsum?
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What type of stress is characterized by forces acting in opposite directions?
What type of stress is characterized by forces acting in opposite directions?
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Study Notes
Dental Materials and Properties
- Gypsum Use: Used in dentistry for impressions and model fabrication
- Dental Material Structure: Classified as metals, metalloids, non-metals; amorphous or crystalline
- Transparent Materials: Includes glass and acrylics
- Rockwell Hardness: Ball indenter with values ranging from 56 to 60 HRB
- Density: Mass per unit volume (Density=Mass/Volume)
- Brinell Hardness: Designated as HB/BHN, with a value of 185 HB
- Absorption: Material property allowing light to pass through
- Dental Material Usage Types: Basic (long-term in mouth), auxiliary (short-term), laboratory (extra-oral)
- Lightness/Darkness (Value): Describes the color intensity relative to a black body
- Setting Time Acceleration: Achieved using accelerators like K2SO4 and NaCl
- VITA Shade Guide: A color guide in dentistry; A1 to A4 represent color variation
- B-Hemitydrate: Formed at 150-200°C for 24-36h under normal pressure
- Tensile Strength: Maximum load a material can handle in tension before failure
- Mechanical Testing: Static tests include tensile, compressive, bending and torsion
- Heat Capacity: Heat required to raise the temperature of a substance by 1°C.
- Thermal Conductivity: Material property for heat transfer
- Brinell Hardness Test: Used to determine the hardness of metals and alloys
- Space Lattice: Regular arrangement of atoms in a solid
- Vickers Hardness Test: Used for testing hard and brittle materials, like porcelain
- Fatigue Strength:* Maximum stress a material can withstand over an infinite number of cycles without failure.
Dental Materials and Properties (Continued)
- Fluorescence: Light emitted by a substance after an excitation.
- Work Time: Mixing time until it becomes unworkable
- Electrical Conductivity: Ability of an object to transmit electric current
- Shore Hardness Test: Used for measuring the hardness of material alloys
- Impact Strength: Energy to fracture a material under impact force
- Mirror-Like Reflection: Incident angle is equal to the reflected angle
- Hue: Dominant color of an object
- Technological Process: Combining several procedures to treat a material
- Crystalline Lattice: Structures of atoms in materials: Body-centered cubic or face-centered cubic
- Polymer Materials: Used in crowns, ceramics, composites, metals, artificial teeth
- Fatigue of Materials: Factors impacting material strength under repeated loading: surface roughness, surface stress, load value, frequency
- Imbibition: Process of absorbing liquids resulting in dimensional change
- Knoop Hardness: A hardness test like the Brinell.
- Elastic Modulus: Ratio of stress to strain in the elastic region.
- Forces for Breaking Food Up: Up to ~980,7 N (100 kg).
- Ductile Materials: Permanent deformation under stress
- Alpha-hemihydrate: Obtained from type II gypsum
- Composite Fillings: Developed as fillings starting from 1966
- Translucent Materials: Partially transparent materials allowing some light transmission
- Alginate Impression Materials: For preliminary impressions and study models.
- Types of Crystalline Lattices (Metals): Body-centered cubic and face-centered cubic
Dental Materials and Properties (Continued)
- Coefficient of Thermal Conductivity: Heat transfer rate through a material.
- Contact Angle of Water: Measure of materials' hydrophilicity or hydrophobicity
- Vickers Hardness Test: Used to determine material hardness using a diamond pyramid
- Elastic Limit: Maximum stress that can be applied to a material without permanent deformation
- Type II Gypsum Use: For study models
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Description
Test your knowledge on the fundamental properties and classifications of dental materials. This quiz covers topics such as luminescence, thermal conductivity, and hardness tests specific to dentistry. Perfect for dental students and professionals looking to refresh their understanding of material science in dentistry.
