History of Dental Ceramics

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Questions and Answers

Who patented the first porcelain tooth material?

  • Stockton
  • de Chemant and Duchateau (correct)
  • Charles Lindbergh
  • Fonzi

What invention did Fonzi introduce in 1808?

  • Terrometallic porcelain teeth (correct)
  • A baking process for dental materials
  • Mass production of porcelain teeth
  • Feldspathic porcelain crowns

Which dentist introduced porcelain teeth to the United States?

  • Ash
  • Planteau (correct)
  • Dr. Charles Land
  • Peale

What issue was primarily related to the use of porcelain crowns introduced by Dr. Charles Land in 1903?

<p>High incidence of fractures (A)</p> Signup and view all the answers

In what year did commercial production of porcelain teeth begin?

<p>1825 (C)</p> Signup and view all the answers

What was one of the primary issues with feldspathic porcelains used in all-ceramic crowns?

<p>Low flexural strength (D)</p> Signup and view all the answers

What significant advancement related to porcelain was patented in 1959?

<p>Formulations of feldspathic porcelains (C)</p> Signup and view all the answers

Which company first developed commercial porcelain around 1963?

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

What characteristic did Ceramco porcelain exhibit that made it more versatile?

<p>Enhanced thermal expansion behavior (C)</p> Signup and view all the answers

What method was used by Peale in 1822 for the porcelain teeth?

<p>A unique baking process (C)</p> Signup and view all the answers

What was introduced by McLean and Hughes in 1965?

<p>Fracture-resistant all-porcelain crowns (B)</p> Signup and view all the answers

What was the fracture rate reported for molar crowns made from aluminous porcelain?

<p>15% (B)</p> Signup and view all the answers

What type of porcelain is required to achieve acceptable aesthetics for aluminous porcelain crowns?

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

Why is marginal adaptation difficult to achieve with aluminous porcelain crowns?

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

Which all-ceramic system was developed in 1984 by controlling the crystallization of glass?

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

What is the volume percentage of leucite in IPS Empress, introduced in the early 1990s?

<p>34 vol% (B)</p> Signup and view all the answers

What type of crystals does IPS Empress 2 contain, introduced in the late 1990s?

<p>Lithia disilicate crystals (B)</p> Signup and view all the answers

What is the principal indication for the use of aluminous porcelain crowns?

<p>Restoration of maxillary anterior crowns (B)</p> Signup and view all the answers

Which material's advancement was discussed regarding ceramic-strengthening mechanisms?

<p>Al2O3 and zirconia (B)</p> Signup and view all the answers

What has significantly enhanced the overall appearance and clinical survivability of MC crowns and bridges?

<p>Advancements in MC properties, design, and performance (A)</p> Signup and view all the answers

Flashcards

All-ceramic crown

A type of dental crown made entirely of ceramic material.

Metal-ceramic crown (MC crown)

A type of dental crown made of ceramic, but with a metal substructure.

Aluminous porcelain

Ceramic material containing a high percentage of alumina (Al2O3) fillers, initially used for dental crowns.

Leucite glass-ceramic

A glass-ceramic material with a high percentage of leucite crystals, commonly used for dental crowns.

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Lithium disilicate glass-ceramic

A glass-ceramic material with a high percentage of lithium disilicate crystals, used in dental crowns and bridges.

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Sintering

The process of heating ceramic materials to a high temperature, causing them to shrink and become more dense.

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Fracture resistance

The ability of a material to resist breakage or fracture under stress.

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Abrasion resistance

The ability of a material to resist wear and tear from abrasive forces.

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Marginal adaptation

The process of creating a smooth and close-fitting interface between two materials, often used in dental restorations.

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Fixed dental prosthesis (FDP)

A type of dental restoration that covers multiple teeth, typically used to replace missing teeth.

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First Porcelain Tooth Material

The first porcelain tooth material was patented in 1789 by a French dentist and pharmacist. This product was an improvement over "mineral paste teeth" but couldn't be attached to denture bases effectively.

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Fonzi's "Terrometallic" Porcelain Tooth

In 1808, an Italian dentist invented a porcelain tooth held in place by a platinum pin or frame, marking a significant advancement in attaching artificial teeth.

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Introduction of Porcelain Teeth to the US

Porcelain teeth were introduced to the United States in 1817, and a baking process for these teeth was developed in Philadelphia in 1822. Commercial production began in 1825.

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Ash's Improved Porcelain Tooth

An improved version of the porcelain tooth was developed in England in 1837. This further refinement contributed to the advancement of dental ceramics.

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S.S.White Company and Mass Production

The S.S.White Company was founded in 1844, leading to refinements in design and mass production of porcelain denture teeth.

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First Ceramic Crowns

Dr. Charles Land introduced one of the first ceramic crowns in 1903. This crown used a platinum foil matrix and high-fusing feldspathic porcelain, offering good aesthetics.

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Fracture Rate of Early Ceramic Crowns

The low flexural strength of early porcelain crowns resulted in a high fracture rate. This limitation challenged the use of all-ceramic crowns without additional support.

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Feldspathic Porcelain with Wide Expansion Coefficients

In 1959, a patent for feldspathic porcelain with a wide range of expansion coefficients and chemical bonding to existing alloys was filed. This innovation addressed the limitations of earlier porcelain materials.

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Commercial Porcelain Development

The first commercial porcelain was developed around 1963. Later, Ceramco porcelain was introduced, exhibiting thermal expansion behavior that allowed it to be used with a wider variety of alloys.

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Versatility of Porcelain Materials

Early porcelain materials had their own aesthetic qualities, but the introduction of more versatile porcelain, like Ceramco, enabled greater compatibility with other materials.

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Study Notes

Early Dental Ceramics

  • First porcelain teeth (1789): Patented by de Chemant and Duchateau; an improvement over mineral paste teeth, but attachment issues prevented widespread use
  • Fonzi (1808): Invented "terrometallic" porcelain teeth held by platinum pins/frames
  • Planteau (1817): Introduced porcelain teeth to the US
  • Peale (1822): Developed a baking process in Philadelphia for porcelain teeth
  • Stockton (1825): Began commercial production of porcelain teeth
  • Ash (1837): Improved porcelain teeth design in England
  • S.S. White Company (1844): Founded by Stockton's nephew, leading to further refinements and mass production

Feldspathic Porcelain Crowns (Early 1900s-1960s)

  • Charles Land (1903): Introduced one of the first ceramic crowns, using feldspathic porcelain over a platinum foil matrix.
  • Key challenges: Low flexural strength of feldspathic porcelain led to frequent fractures; Firing shrinkage caused fitting issues unless corrected.

Advancements in Porcelain (1959-1960s)

  • Weinstein et al. (1959): Filed patent for feldspathic porcelains with diverse expansion coefficients and chemical bonding to alloys.
  • VITA Zahnfabrik (circa 1963): Developed the first commercial porcelain.
  • Ceramco Porcelain (Dentsply Sirona): Introduced in the 1960s; more versatile, enabling use with a wider variety of alloys due to its thermal expansion behavior; improvements in aesthetics and "vitality" of crowns/bridges
  • Improved properties include opalescence, internal staining, greening-resistant formulations, and various edge types like butt-joints and shoulders

All-Porcelain Crowns (1960s)

  • McLean and Hughes (1965): Introduced fracture-resistant all-porcelain crowns using dental aluminous core ceramic (glass matrix with Al2O3 fillers) to improve strength.
  • Aesthetics compromised: Aluminous porcelain had a chalky-white appearance necessitating a feldspathic veneer.
  • High fracture rate in molars (15%); Anterior crowns 2% fracture rate

All-Ceramic Crowns (1980s-2000s)

  • Adair and Grossman (1984): Developed a crystallization-control glass ceramic (Dicor).
  • Dicor MGC variant: Machinable glass-ceramic
  • IPS Empress (early 1990s): Pressable glass-ceramic with leucite.
  • IPS Empress 2 (late 1990s): More fracture-resistant pressable glass-ceramic with lithia disilicate crystals .

Summary of Ceramics

  • Significant progress in ceramic properties and crown-making techniques improved strength, accuracy, and aesthetics of all-ceramic crowns.
  • Continuous efforts are geared to develop less abrasive veneering ceramics

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