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Properties of Dental Materials

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Physical, Chemical, and Surface Properties

Physical, Chemical, and Surface Properties

Physical, Chemical, and Surface Properties

Physical Properties of Dental Materials

Sources

DENSITY • The amount of mass of a material in a given volume. • Density units are g/cm2.

DENSITY • The amount of mass of a material in a given volume. • Density units are g/cm2.

VISCOSITY • The ability of a material to flow. • Thick liquids flow poorly, thin liquids flow easily. • Viscosity is measured in grams/meter/second

VISCOSITY • The ability of a material to flow. • Thick liquids flow poorly, thin liquids flow easily. • Viscosity is measured in grams/meter/second

HARDNESS • The resistance of a material to indentation. • It is measured by scientific instruments that press a characteristically shaped tips made of steel or diamond. • Hardness is calculated based on the size of the indentation, the load on the tip, and the shape of the tip. • Brinell, Rockwell, Vickers, and Knoop tests

HARDNESS • The resistance of a material to indentation. • It is measured by scientific instruments that press a characteristically shaped tips made of steel or diamond. • Hardness is calculated based on the size of the indentation, the load on the tip, and the shape of the tip. • Brinell, Rockwell, Vickers, and Knoop tests

SOLUBILITY AND SORPTION • Solubility – Susceptible to being dissolved • Sorption – Adsorption plus absorption • Adsorption – Natural process where molecules of a gas or liquid adhere to the surface of a solid • Absorption – Passage of a substance into the interior of another by solution or penetration

SOLUBILITY AND SORPTION • Solubility – Susceptible to being dissolved • Sorption – Adsorption plus absorption • Adsorption – Natural process where molecules of a gas or liquid adhere to the surface of a solid • Absorption – Passage of a substance into the interior of another by solution or penetration

RHEOLOGY is the study of the deformation and flow characteristics of matter, whether liquid or solid.

RHEOLOGY is the study of the deformation and flow characteristics of matter, whether liquid or solid.

Understanding the physical behavior of dental materials is crucial for ensuring clinical success. Key physical characteristics include:

  • Density: The mass of a material per unit volume, typically measured in g/cm2\text{g/cm}^2.
  • Viscosity: The resistance of a liquid to flow. Thick liquids flow poorly (high viscosity), whereas thin liquids flow easily (low viscosity). It is measured in grams per meter per second (g/(m⋅s)\text{g}/(\text{m}\cdot\text{s})).
  • Rheology: The study of the deformation and flow characteristics of matter, encompassing both liquids and solids.
Sources

DENSITY • The amount of mass of a material in a given volume. • Density units are g/cm2.

DENSITY • The amount of mass of a material in a given volume. • Density units are g/cm2.

VISCOSITY • The ability of a material to flow. • Thick liquids flow poorly, thin liquids flow easily. • Viscosity is measured in grams/meter/second

VISCOSITY • The ability of a material to flow. • Thick liquids flow poorly, thin liquids flow easily. • Viscosity is measured in grams/meter/second

RHEOLOGY is the study of the deformation and flow characteristics of matter, whether liquid or solid.

RHEOLOGY is the study of the deformation and flow characteristics of matter, whether liquid or solid.

Hardness, Solubility, and Sorption

Hardness represents a material's resistance to permanent indentation. It is evaluated using scientific instruments that press a steel or diamond tip of a specific shape into the material under a known load. Hardness values are calculated based on the indentation size, load, and tip geometry. Common standardized tests include the Brinell, Rockwell, Vickers, and Knoop hardness tests.

Solubility and Sorption describe how materials interact with fluids in the oral cavity:

  • Solubility: The susceptibility of a material to being dissolved in a solvent.
  • Sorption: The combined effect of adsorption (a surface phenomenon where molecules adhere to the solid surface) and absorption (the penetration of a substance into the interior of another).
Sources

HARDNESS • The resistance of a material to indentation. • It is measured by scientific instruments that press a characteristically shaped tips made of steel or diamond. • Hardness is calculated based on the size of the indentation, the load on the tip, and the shape of the tip. • Brinell, Rockwell, Vickers, and Knoop tests

HARDNESS • The resistance of a material to indentation. • It is measured by scientific instruments that press a characteristically shaped tips made of steel or diamond. • Hardness is calculated based on the size of the indentation, the load on the tip, and the shape of the tip. • Brinell, Rockwell, Vickers, and Knoop tests

SOLUBILITY AND SORPTION • Solubility – Susceptible to being dissolved • Sorption – Adsorption plus absorption • Adsorption – Natural process where molecules of a gas or liquid adhere to the surface of a solid • Absorption – Passage of a substance into the interior of another by solution or penetration

SOLUBILITY AND SORPTION • Solubility – Susceptible to being dissolved • Sorption – Adsorption plus absorption • Adsorption – Natural process where molecules of a gas or liquid adhere to the surface of a solid • Absorption – Passage of a substance into the interior of another by solution or penetration

Adhesion, Cohesion, and Wettability

Sources

ADHESION Adhesion: A molecular or atomic attraction between two contacting surfaces promoted by the interfacial force of attraction between the molecules or atoms of two different species; adhesion may occur as chemical adhesion, mechanical adhesion (structural interlocking), or a combination of both. Cohesion: Force of molecular attraction between molecules or atoms of the same species.

ADHESION Adhesion: A molecular or atomic attraction between two contacting surfaces promoted by the interfacial force of attraction between the molecules or atoms of two different species; adhesion may occur as chemical adhesion, mechanical adhesion (structural interlocking), or a combination of both. Cohesion: Force of molecular attraction between molecules or atoms of the same species.

WETTABILITY • Measure of the affinity of a liquid for a solid as indicated by spreading of a drop • Observed by shape of the drop of liquid on the solid surface • Flatter shape indicates more wetting

WETTABILITY • Measure of the affinity of a liquid for a solid as indicated by spreading of a drop • Observed by shape of the drop of liquid on the solid surface • Flatter shape indicates more wetting

The success of dental restorations depends heavily on interfacial bonding:

  • Adhesion: The molecular or atomic attraction between two contacting surfaces of different species. This can occur via chemical adhesion, mechanical adhesion (structural interlocking), or a combination of both.
  • Cohesion: The force of molecular attraction between molecules or atoms of the same species.
  • Wettability: The affinity of a liquid for a solid surface, which is evaluated by observing the shape of a liquid drop on the surface. A flatter droplet shape indicates superior wetting and higher affinity.
Sources

ADHESION Adhesion: A molecular or atomic attraction between two contacting surfaces promoted by the interfacial force of attraction between the molecules or atoms of two different species; adhesion may occur as chemical adhesion, mechanical adhesion (structural interlocking), or a combination of both. Cohesion: Force of molecular attraction between molecules or atoms of the same species.

ADHESION Adhesion: A molecular or atomic attraction between two contacting surfaces promoted by the interfacial force of attraction between the molecules or atoms of two different species; adhesion may occur as chemical adhesion, mechanical adhesion (structural interlocking), or a combination of both. Cohesion: Force of molecular attraction between molecules or atoms of the same species.

WETTABILITY • Measure of the affinity of a liquid for a solid as indicated by spreading of a drop • Observed by shape of the drop of liquid on the solid surface • Flatter shape indicates more wetting

WETTABILITY • Measure of the affinity of a liquid for a solid as indicated by spreading of a drop • Observed by shape of the drop of liquid on the solid surface • Flatter shape indicates more wetting

Mechanical Forces in the Oral Cavity

Sources

THREE BASIC FORCES A. Tensile = Force that pulls an object apart. Object pulled by this force is under tension.

THREE BASIC FORCES A. Tensile = Force that pulls an object apart. Object pulled by this force is under tension.

THREE BASIC FORCES B. Compression = Force that squeezes an object together. Such an object is under compression.

THREE BASIC FORCES B. Compression = Force that squeezes an object together. Such an object is under compression.

THREE BASIC FORCES C. Shear = Force that slides the top of the object over the bottom. Like a deck of cards stacked on table. You put force on the top cards and slide them over the rest of the deck.

THREE BASIC FORCES C. Shear = Force that slides the top of the object over the bottom. Like a deck of cards stacked on table. You put force on the top cards and slide them over the rest of the deck.

INTRAORAL BITING FORCES • Molars –580 Newtons. (132lbs.) • Premolars – 310 Newtons (70.5 lbs.) • Cuspids – 220 Newtons (41 lbs.) • Partial and complete dentures –111 Newtons ( 25 lbs.)

INTRAORAL BITING FORCES • Molars –580 Newtons. (132lbs.) • Premolars – 310 Newtons (70.5 lbs.) • Cuspids – 220 Newtons (41 lbs.) • Partial and complete dentures –111 Newtons ( 25 lbs.)

Dental restorations must withstand significant mechanical forces during mastication. The three basic forces are:

  1. Tensile Force: A force that pulls an object apart, putting it under tension.
  2. Compressive Force: A force that squeezes or compresses an object together.
  3. Shear Force: A force that slides one part of an object over another (analogous to sliding the top cards of a deck over the bottom ones).

Intraoral Biting Forces

The magnitude of force applied varies significantly depending on the tooth type and prosthesis:

  • Molars: 580 N580\text{ N} (132 lbs132\text{ lbs})
  • Premolars: 310 N310\text{ N} (70.5 lbs70.5\text{ lbs})
  • Cuspids: 220 N220\text{ N} (41 lbs41\text{ lbs})
  • Partial and Complete Dentures: 111 N111\text{ N} (25 lbs25\text{ lbs})
Sources

THREE BASIC FORCES A. Tensile = Force that pulls an object apart. Object pulled by this force is under tension.

THREE BASIC FORCES A. Tensile = Force that pulls an object apart. Object pulled by this force is under tension.

THREE BASIC FORCES B. Compression = Force that squeezes an object together. Such an object is under compression.

THREE BASIC FORCES B. Compression = Force that squeezes an object together. Such an object is under compression.

THREE BASIC FORCES C. Shear = Force that slides the top of the object over the bottom. Like a deck of cards stacked on table. You put force on the top cards and slide them over the rest of the deck.

THREE BASIC FORCES C. Shear = Force that slides the top of the object over the bottom. Like a deck of cards stacked on table. You put force on the top cards and slide them over the rest of the deck.

INTRAORAL BITING FORCES • Molars –580 Newtons. (132lbs.) • Premolars – 310 Newtons (70.5 lbs.) • Cuspids – 220 Newtons (41 lbs.) • Partial and complete dentures –111 Newtons ( 25 lbs.)

INTRAORAL BITING FORCES • Molars –580 Newtons. (132lbs.) • Premolars – 310 Newtons (70.5 lbs.) • Cuspids – 220 Newtons (41 lbs.) • Partial and complete dentures –111 Newtons ( 25 lbs.)