Dental Materials

• what are the disadvantages of Glass Ionomer Cement?

  • It has low strength compared to amalgam and composites.

  • Very exacting handling is required for correct placement.

  • Can be easily ruined by moisture contamination

  • The mix has to be the exact proportion of powder and

  liquid for the optimal set.
• what are the advantages of Glass Ionomer Cement?

  - It adheres to the enamel, dentine, and cementum.

  - It is ideal for class V cavities.

  - It has an excellent marginal seal.

  - it releases fluoride over time.

  - It is better aesthetically than amalgam
• what are the two Glass Ionomer Cement properties?

  • It releases fluoride - preventing further caries development around the cavity

  • It bonds directly to enamel, dentine and cementum without acid etching
• what are Glass Ionomer Cement uses?

  Can be used for restorations, linings, fissure sealants, and adhesive cements.
• what are Glass Ionomer Cements?

  Glass ionomer consists of a powder (a glass-like mixture of

  aluminosilicates) and liquid (that contains polyacrylic acid) which are mixed together
• what are the disadvantages of Zinc Oxide and Eugenol?

  • It is too soft and slow setting to use as a foundation

  for a permanent filling in one visit.

  • It is not compatible with composite fillings.

  • Some patients are allergic to preparations containing eugenol.
• what are the advantages of Zinc Oxide and Eugenol?

  -Soothing and non irritating to pulp

  - Can be used as a sedative lining under a permanent restoration
• what is Zinc Oxide and Eugenol used for?

  • Temporary Fillings.

  • Non-irritant lining for deep cavities.

  • Sedative dressing for painful carious teeth.

  • Main constituent of some impression pastes, periodontal packs, and root filling materials.
• what is Zinc Oxide and Eugenol?


  • This material is made by mixing Zinc Oxide powder and drops of Eugenol ( oil of cloves).
• how is alginate handled?

  • Impressions should be rinsed and disinfected in cold water.

  • Should not be left in soak for longer than described on the manufacturer's instructions.

  • Stored or transported wrapped in damp gauze,

  in a airtight bag
• what are the disadvantages of alginate?

  • Distortion of impression can occur.

  • The best models are obtained by casting up straight away.

  • Specific handling is necessary to prevent distortion
• what are the advantages of alginate?

  IT IS THE MATERIAL OF CHOICE FOR MOST IMPRESSIONS

  
  

  • Easy to use

  • Elastic and can be used for all types of impressions.

  • They can be withdrawn from undercut areas without distortion, tears or fractures
• what is alginate?

  irreversible hydrocolloid impression material