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Materials Science & Engineering, Dyandra Wirahana Hasan - 2106717682 -…

- - - - it can expand or contract in a long period of time
    - - The forces that is applied to the amalgam restoration over time will cause the amalgam to creep
    - - the strongest amalgam condition will increase rapidly after trituration
      - Silver alloy contains copper
      - the strength of amalgam depends on the duration of the mixing process
    - - tarnish: the change of color of the amalgam
      - Corrosion: amalgam quality is bad that will lead to the failure of restoration
- - - - it is a synthetic components used to replace teeth damage structure, it is divided inti two type, direct and indirect depending on intraoral usage and direct prosthetic device on the teeth.
      - Ex: primers, bonding agents, liners, cement base, amalgams, resin-based composite, and ect.)
    - - it is used to fabricate dental prostheses, but does not end up being a part of the end-product.
      - Ex: Cement, impression materials, impression tray, mouth guards, ect.)
    - - it prevents the teeth from potential damage and bacteria (ex: mouthwash, pit and fissure sealants, ect.)
  - - - Thermal conductivity material are the material that can conduct low or high temperature. each material has different rates of conducting heat; metals have higher values than polymers and ceramics. it also ha variety of material:
        Human dentin<human<enamel<composites<cement<amalgam<gold alloys
    - - it is divided into two interest and they are galvanism and corrosion. Galvanism is the generation of electrical currents that the patient can feel whereas Corrosion is the dissolution of metals in the mouth
    - - it is a percentage of expansion or shrinkage of the material used that occurs during setting as a result of chemical reaction. for example when cooling off wax pattern or gold restoration during fabrication. Another example are thermal dimensional change due to the change of temperature inside the mouth
    - - Stress, Strain, Elastic modulus, Stress strain curves, Proportional Limit and Yield Strength, ultimate strength, Resilience and Toughness, Hardness, strain-time curves, and dynamic properties
  - - - it is the second major class of dental materials
      - it has good Strength, brittleness, rigidness, and relatively high melting temperatures
        
        insulating
        
        can be transparent
        
        useful for mimicking lost tooth structure
        
        abrade other materials, as containers for molten materials, and as fillers to add strength to dental composites
    - - it is the third major of dental materials
      - it has the characteristic of rubber (flexible)
      - Polymer molecules may also be tied together with other small polymers and other types of covalent bonds, creating a more rigid, less moldable, and much harder property.
      - mostly used as a preventive materials, in cements, used as an impression materials, and waxes
    - - it is the first major class of dental materials
      - it has a good strength, ductility, shininess, and it also conduct head or electricity
      - When different elements bond together in the same metallic array it will bond into Alloy
    - - it is a result when classes of materials ar combined or mix together
      - The matrix of the material: providing the framework and holding the basic material form
      - Polymers are chemically formed in place (“in situ”) in the tooth in a matter of seconds
      - it is not that strong