All-Ceramic Systems Overview

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Questions and Answers

What is a primary characteristic of the IPS Empress CAD material?

  • It is exclusively used for posterior crowns.
  • Leucite crystals are not evenly distributed.
  • It contains no glass matrix.
  • It does not require a second heating cycle for the crystalline phase. (correct)

Which of the following statements is true regarding the IPS Empress II material?

  • Lithium-disilicate glass provides less translucency.
  • It contains a low percentage of crystalline structures.
  • It has a high refractive index.
  • It hinders crack propagation effectively. (correct)

Which types of restorations are indicated for the lithium disilicate IPS e.max Press material?

  • Cantilever bridges.
  • Inlay-retained fixed partial dentures (FPD).
  • Only posterior crowns.
  • 3-unit anterior fixed partial dentures. (correct)

What is a contraindication for using IPS e.max?

<p>Patients with bruxism. (A)</p> Signup and view all the answers

What is a benefit of using VITA SUPRINITY glass ceramic material?

<p>It belongs to a new generation of glass ceramic products. (A)</p> Signup and view all the answers

What is the primary purpose of the absorbent refractory die in the In-Ceram technique?

<p>To facilitate easy separation of the core (D)</p> Signup and view all the answers

What reduces the strength of the In-Ceram material when magnesium oxide crystals are added?

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

Which statement about In-Ceram zirconia is correct?

<p>It has a strength 1.4 times that of In-Ceram alumina (B)</p> Signup and view all the answers

What process is used to infuse the residual pores of the core in the In-Ceram technique?

<p>Capillary action to draw molten glass (C)</p> Signup and view all the answers

What is the typical strength range for In-Ceram materials designed for anterior and posterior crowns?

<p>300-600 MPa (C)</p> Signup and view all the answers

What is the primary composition of glass-based ceramics?

<p>Mainly silicon dioxide (B)</p> Signup and view all the answers

Which option is a type of reinforced glass ceramic?

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

What percentage of alumina is typically added to feldspathic ceramics as a reinforcing component?

<p>20–25% (A)</p> Signup and view all the answers

Which material is specifically mentioned as being machinable for the fabrication of veneers, inlays, and onlays?

<p>Vitablocs Mark II (D)</p> Signup and view all the answers

What is the primary component used to enhance the strength of glass ceramics in zirconia-reinforced lithium silicate ceramics?

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

What is the typical range of flexural strength for feldspathic ceramics?

<p>60–70 MPa (D)</p> Signup and view all the answers

Which type of material is utilized for the specific veneering of alumina-based core systems?

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

Which ceramic is indicated for fabricating full veneer crowns and three-unit FPDs up to the second premolars?

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

Which of the following ceramics is described as containing over 50% silica?

<p>Glass-based ceramics (B)</p> Signup and view all the answers

What is the strength of the Celtra Duo when polished?

<p>370 MPa (C)</p> Signup and view all the answers

What category does glass infiltrated alumina fall under in microstructural classification?

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

What component is primarily responsible for the translucency of feldspathic restorations?

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

Which of the following compounds is NOT a form of ceramic system classification mentioned?

<p>Metal-based ceramics (A)</p> Signup and view all the answers

What is the primary advantage of Vita Ambria over IPS e.max press ceramics?

<p>More fracture resistance (A)</p> Signup and view all the answers

How much zirconia is contained in Vita Suprinity, according to its composition?

<p>10% (A)</p> Signup and view all the answers

Which ceramic system is known for having the highest strength at more than 500 MPa?

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

What is a key advantage of using premanufactured blocks in dental ceramics?

<p>They eliminate residual porosity that could lead to failure. (B)</p> Signup and view all the answers

Which of the following is NOT a feature of VITABLOCS®?

<p>Made entirely from zirconia. (C)</p> Signup and view all the answers

Which material was promoted by VITA in 1991 with improved composition and properties?

<p>VITABLOCS® Mark II. (A)</p> Signup and view all the answers

What is the flexural strength of IPS Empress?

<p>160 MPa. (D)</p> Signup and view all the answers

Which category does the IPS Empress fall under in microstructural classification?

<p>Category II: High-leucite containing glass. (C)</p> Signup and view all the answers

What is the main crystalline phase in IPS Empress?

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

Which of the following is true regarding Category II (Synthetic) in microstructural classification?

<p>It includes high-leucite and low-leucite systems. (A)</p> Signup and view all the answers

Which of the following statements about VITABLOCS® TriLuxe is accurate?

<p>It offers a polychromatic four-layer shade gradient. (A)</p> Signup and view all the answers

Flashcards

Glass-ceramic composition

Glass-ceramics are composed primarily of glass, with added materials like zirconia, for enhanced properties.

Zirconia reinforced lithium silicate (ZLS)

A type of high-strength glass-ceramic containing 10% zirconia to improve its fracture resistance.

Celtra Duo

A high strength glass ceramic containing 10% zirconia-reinforced lithium silicate used for crowns, implants, inlays onlays and veneers.

VITA AMBRIA

A high strength glass ceramic containing 10% zirconia and lithium disilicate matrix for dental restorations, showing high stability.

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All-ceramic systems

Dental restorations made completely from ceramic materials, classified as Glass-based, Reinforced, and Glass-infiltrated.

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Classification of ceramic systems

Categorization of ceramic restoration materials based on their composition and properties, including glass-based, reinforced glass ceramics, glass-infiltrated alumina & more.

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Infiltrated ceramic (Slip-cast ceramic)

A type of ceramic material where glass is infiltrated into alumina to create a stronger and more stable material.Introduced in 1988.

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Glass-infiltrated alumina

A ceramic restoration material with a glass component incorporated into alumina (aluminum oxide), which is a very hard crystalline material.

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All-Ceramic Systems

Dental restorations made entirely of ceramic materials, classified into different types based on their composition and microstructure.

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Premanufactured block benefit

Premanufactured blocks have no internal voids (porosity), preventing potential weak points that could lead to catastrophic failure.

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Glass-based (Feldspathic) Ceramics

Dental ceramics primarily composed of silica (glass) and feldspars, offering translucency but lower strength.

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VITABLOCS®

Feldspar-based CAD/CAM ceramics, commonly used, with a small grain size (4μm) and high flexural strength (120 MPa).

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Reinforced Glass Ceramics

Ceramic materials with glass components reinforced with other materials (e.g., alumina) for improved strength.

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VITA Mark II

A monochromatic (single-color) VITABLOCS® material with improved chemical and physical properties, developed in 1991.

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VITABLOCS® TriLuxe/TriLuxe forte

Polychromatic (multiple-color) VITABLOCS® versions introduced in 2003 and 2007, respectively, offering a shade gradient for tooth color imitation.

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Zirconia Ceramics

High-strength ceramic material offering exceptional toughness, used in various dental applications.

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VITABLOCS® RealLife

A polychromatic feldspar ceramic from 2010, enhancing 3D color intensity for even more natural-looking tooth restorations.

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Resin-based Ceramics

Combination of ceramics and resins, often enhancing translucency in dental restorations.

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Glass Infiltrated Alumina

Ceramic system where alumina is infiltrated with glass, resulting in a material with enhanced properties.

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All-Ceramic Systems Classification

A categorization of ceramic materials used in dentistry, based on their base composition (glass-based, glass-infiltrated alumina, and others).

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Feldspars

Naturally occurring minerals that contain potassium, sodium, aluminum, and silicon, and are crucial in glass-based ceramics.

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Glass-based (Feldspathic) Ceramics

One type of all-ceramic system where the core material is primarily composed of glass.

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Category II (Synthetic) Glass-based systems

Glass-based ceramic with fillers like leucite or lithium disilicate, often subdivided into subgroups based on leucite content.

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Flexural Strength

Resistance of a material to bending forces. Important characteristic in dental ceramics.

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Microstructural Classification

Categorization of dental ceramics based on the arrangement of their components (e.g., glass-based).

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IPS Empress

A Category II ceramic that uses leucite crystals (35%-50% by volume) in a glass matrix to achieve high strength (160 MPa) and adjust shade with staining/veneering.

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Leucite Crystals

Crystalline material added to feldspathic glass to adjust thermal expansion properties.

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Category I

Glass-based ceramic systems, composed largely of silica (silicon dioxide).

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IPS Empress CAD

A dental ceramic material for single anterior crowns and inlays/onlays, containing leucite crystals in a glass matrix.

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IPS Empress II (now IPS e.max)

High-strength lithium-disilicate glass ceramic, exceptionally translucent due to its low refractive index.

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IPS e.max press

Lithium disilicate glass ceramic restoration made with the lost wax technique, used for veneers, inlays, onlays, and anterior/posterior crowns.

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IPS e.max CAD

A CAD/CAM lithium-disilicate glass ceramic restoration with stronger bonding strength.

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Lithium-disilicate

A key component of IPS e.max, a strong and translucent glass ceramic, highly crystalline.

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Category II (Synthetic)

Classification of synthetic glass-ceramic materials, including lithium-disilicate.

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Indications (IPS e.max)

Veneers, inlays, onlays, anterior/posterior crowns, 3-unit anterior FPD, 3-unit FPD up to second premolars.

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Contraindications (IPS e.max)

Posterior FPD past molars, 4-unit FPD, inlay-retained FPD, short dentition, bruxism, cantilever bridges.

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VITA SUPRINITY

A new generation of glass ceramic material by VITA.

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Inlay

A type of dental restoration that fills a cavity in a tooth.

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Onlay

A type of dental restoration that covers a portion of the chewing surface of a tooth.

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Crown

A dental restoration that completely covers the visible portion of a tooth.

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Veneer

A thin layer of porcelain or composite material bonded to the front surface of a tooth to improve its appearance.

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In-Ceram fabrication

A process of creating interpenetrating phase materials by first producing a porous ceramic matrix (like a sponge) and then filling the pores with a liquid glass using capillary action.

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Absorbent refractory die

A material used in the creation of In-Ceram's porous core. It absorbs water from a slurry (mix of powder and water) and shrinks more than the mixture after sintering, allowing for easy separation from the core.

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VITA In-Ceram

A type of glass-infiltrated alumina ceramic used in dental restorations, characterized by filling with lanthanum aluminosilicate glass into a porous alumina core created using a special die.

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Sintering

A high-temperature process used to fuse the components in a ceramic, resulting in a stronger and more dense core.

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Interpenetrating phase materials

Materials composed of two or more phases that are interlocked at the microscale to improve properties like high strength and translucency.

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In-Ceram strength

Generally high but can be decreased by 25-40% depending on the modifications such as the addition of Magnesium to improve translucency. The introduction of zirconia will increase the strength with a trade off for increased opacity.

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Alumina

A ceramic compound, a very hard crystalline material used as a base in various dental ceramics

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Glass infiltration

Filling the pores of a porous structure, with a liquid glass, to create a dense and strong material.

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Study Notes

All-Ceramic Systems

  • I. Glass-based (Feldspathic): Made primarily of silica. Acid-etched ceramic contains more than 50% silica. Feldspathic (Silica Based).
  • II. Reinforced Glass ceramics: Include IPS Empress, IPS e.Max ceramics, Vita Suprinity (10% Zirconia), Celtra Duo (10% Zirconia)
  • III. Glass-infiltrated alumina: Composed of In-ceram and Spinel
  • IV. Zirconia ceramic: High-performance ceramic
  • V. Resin-based ceramics: Ceramic reinforced resins (e.g., Vita Enamic, Lava Ultimate, Visio ligne, CeraSmart, Brilliant, Grandio)

Microstructural

  • Category I: Glass-based systems (mainly silica)

  • Acid etched ceramic contains more than 50% silica

  • Feldspathic (Silica Based)

  • Glass-based systems contain mainly silicon dioxide (silica or quartz), which contains various levels of alumina (alumino-silicates)

  • Potassium and sodium are known as feldspars

Category II (Synthetic)

  • 1. Low-to-moderate leucite-containing feldspathic glass: Feldspathic porcelains; Leucite added to raise thermal expansion coefficient; Can be applied to metals and zirconia. Example: Vita VM13
  • 2. High-leucite containing glass: IPS Empress glass contains leucite crystal as a major crystalline phase (35%-50%) in a glassy matrix. Flexural strength: ~160 MPa.

Category III (Non Silica Based)

  • Crystalline-Based systems with glass filler (mainly alumina) Introduced in 1988. Example: In-Ceram Infiltrated ceramics (slip-cast)

Infiltrated Ceramic (slip-Cast ceramic)

  • Glass infiltrated Alumina.
  • Products in two components:
    • Powder (aluminum oxide—porous substructure)
    • Glass infiltrated at high temperature into the porous substructure
  • Interpenetrating phase materials are generally fabricated by first creating a porous matrix, in the case of VITA In-Ceram(ceramic sponge). The pores are filled by the second-phase material, a lanthanum aluminosilicate glass. Capillary action is used to produce a dense interpenetrating material.
  • Core Formation (A): Slurries of the fine alumina powder and water (“slip”) are applied to an absorbent refractory die, this is then sintered for 10 hours at 1120°C to produce a porous core.
  • Importance of absorbent refractory die:
    • Absorbs water from the slip, leading to condensation
    • Refractory die shrinks more than the condensed slip, enabling easy separation.

Residual Porosities

  • Residual pores are infused with molten glass by capillary action. In-Ceram is fired at ~1100°C for 4–6 hours.
  • Veneering porcelain (Vitadur alpha Aluminious) is then applied using conventional powder slurry technique.

Indications

  • Veneers, inlays, onlays, anterior and posterior crowns, 3-unit anterior FPD, 3-unit FPD up to the second premolar as the abutment tooth

Contraindications

  • Posterior FPD reaching into the molar region, 4-unit FPD, inlay-retained FPD, patients with short dentition, bruxism, cantilever bridges

VITA SUPRINITY

  • A new generation of glass ceramic material product.
  • The glass ceramic is enriched with zirconia (approx. 10% by weight) to offer a high-strength, zirconia-reinforced lithium silicate ceramic (ZLS).
  • 420 MPa

CELTRA Duo

  • High-strength glass ceramics with 10% zirconia-reinforced lithium silicate-ZLS.
  • 210 MPa (polishing), 370 MPa (firing), 420 MPa (bonding).
  • Indicated for single-unit anterior and posterior crowns, single-tooth implant superstructures.

VITA AMBRIA

  • Vita Ambria (ZLS) is similar to Vita Suprinity with 10% zirconia fillers in its lithium disilicate glass-ceramic matrix.
  • Showed more fracture resistance than IPS e.max press.
  • Very high stability (>500 MPa). Used for inlays, onlays, full veneer crowns, three-unit FPD up to the second premolars.

IPS e.max press

  • Crystalline phase is lithium disilicate (makes up ~70% of the volume of the glass ceramic).
  • 400-450 MPa (after bonding)
  • 500-530 MPa (e-max CAD).

Modifications for In-Ceram Technique

  • 1. In-Ceram Contains Magnesium Oxide:
    • Contains magnesium oxide crystal to form alumina–magnesium oxide (spinel) as a major crystalline phase.
    • Improves translucency but decreases strength by 25% to 40%.
  • 2. In-Ceram Zirconia:
    • Contains zirconium oxide crystal.
    • Its strength is 1.4 times that of In-Ceram alumina.
    • Associated with increased opacity.

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