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Viva Question and Answers Related to Cement Bases in Dentistry

Here are 30 viva questions and answers related to cement bases in dentistry:

  1. What is a cement base in dentistry?
    • A cement base in dentistry is a layer of dental cement placed between a dental restoration, such as a crown or bridge, and the prepared tooth structure.
  1. What are the primary purposes of using cement bases in dentistry?
    • Cement bases help to provide thermal insulation, protect the pulp, and enhance the retention and stability of dental restorations.
  1. Which types of dental cements are commonly used as bases?
    • Zinc phosphate cement, glass ionomer cement, and resin-modified glass ionomer cement are commonly used as dental cement bases.
  1. How does a cement base provide thermal insulation to the tooth?
    • Cement bases have low thermal conductivity, helping to insulate the tooth from temperature changes and prevent sensitivity.
  1. What is the role of a cement base in protecting the dental pulp?
    • Cement bases act as a barrier, protecting the pulp from thermal and chemical irritation caused by restorative materials.
  1. When would you choose glass ionomer cement as a base material?
    • Glass ionomer cement is often chosen when fluoride release, adhesion to tooth structure, and ease of use are important considerations.
  1. What are the advantages of using resin-modified glass ionomer cement as a base?
    • Resin-modified glass ionomer cement offers improved strength and better adhesion compared to conventional glass ionomer cements.
  1. How does the choice of cement base affect the longevity of a restoration?
    • The proper selection and placement of a cement base contribute to the longevity of a restoration by ensuring good adhesion, protection of the pulp, and resistance to microleakage.
  1. What factors influence the setting time of zinc phosphate cement?
    • Mixing technique, powder-to-liquid ratio, and environmental conditions can influence the setting time of zinc phosphate cement.
  1. Explain the term “dual-cure” in the context of resin-modified glass ionomer cement.
    • Dual-cure means that the cement can cure both through chemical reaction and light activation, providing versatility in various clinical situations.
  1. How do you manage excess cement when placing a restoration with a cement base?
    • Excess cement should be carefully removed to prevent tissue irritation, and proper cleaning techniques, such as flossing, can be employed.
  1. Discuss the differences between luting cements and base cements.
  1. What are the potential complications associated with the use of zinc phosphate cement?
    • Pulpal irritation and sensitivity may occur if the cement comes into direct contact with the pulp.
  1. When might a dentist choose a temporary cement as a base material?
    • Temporary cements are often used as bases when a provisional restoration is in place, and the final restoration is not immediately available.
  1. Explain the adhesion mechanism of glass ionomer cements to tooth structure.
    • Glass ionomer cements chemically bond to tooth structure through the formation of ionic bonds with hydroxyapatite.
  1. What is the significance of the powder-to-liquid ratio in the mixing of zinc phosphate cement?
    • The powder-to-liquid ratio affects the consistency and setting characteristics of zinc phosphate cement, and an incorrect ratio may compromise its properties.
  1. How does the use of a liner differ from that of a cement base in restorative dentistry?
    • A liner is a thin layer placed on the deepest part of a preparation to protect the pulp, while a cement base is a thicker layer supporting the entire restoration.
  1. Discuss the indications for using a resin-modified glass ionomer cement as a base.
    • Resin-modified glass ionomer cement is indicated for situations where improved adhesion, esthetics, and fluoride release are desired.
  1. Can you name a circumstance where a dual-cure cement base would be advantageous?
  1. How does the coefficient of thermal expansion of a cement base influence its clinical performance?
    • A matching coefficient of thermal expansion between the cement base and the tooth structure minimizes the risk of microleakage and restoration failure.
  1. What precautions should be taken when using resin-based cements as bases?
    • Isolation from moisture, proper light curing, and attention to proper thickness are essential precautions when using resin-based cements as bases.
  1. Discuss the role of tricure cements in restorative dentistry.
    • Tricure cements can cure through light, chemical reaction, and moisture, making them versatile for various clinical scenarios.
  1. How do you prevent voids or gaps when placing a cement base?
    • Proper mixing, placement, and adaptation of the cement are crucial to prevent voids or gaps in the cement base.
  1. Explain the concept of “hydraulic” setting in dental cements.
    • Hydraulic setting involves the cement setting in the presence of water, as seen in zinc phosphate cements, contributing to their ability to set in a wet environment.
  1. What are the key properties of a cement base that contribute to its sealing ability?
  1. When might a dentist consider using a self-adhesive resin cement as a base?
    • Self-adhesive resin cements can be considered as bases when a simplified technique and adequate bond strength are acceptable for the clinical situation.
  1. How does the setting time of glass ionomer cements compare to zinc phosphate cements?
    • Glass ionomer cements generally have a longer setting time compared to zinc phosphate cements, allowing for more extended working time.
  1. What are the potential challenges in the removal of glass ionomer cement during a restorative procedure?
    • Glass ionomer cement removal can be challenging due to its hardness, and care must be taken to avoid excessive removal of tooth structure.
  1. How does the use of a liner in combination with a cement base affect the overall success of a restoration?
    • The combination of a liner and cement base can provide enhanced protection to the pulp, minimize postoperative sensitivity, and improve the overall success of a restoration.
  1. What advancements have been made in cement technology to address the limitations of traditional cements in dentistry?


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