Here are 20 viva questions and answers related to dental matrix:
- What is a dental matrix?
- Answer: A dental matrix is a device used in restorative dentistry to shape and support dental materials during the placement of dental restorations, such as fillings or crowns.
- Why is a dental matrix used in dentistry?
- Answer: Dental matrices are used to provide a temporary form and support for dental materials, ensuring proper contour and contact with adjacent teeth during the restoration process.
- What are the types of dental matrices?
- Answer: Dental matrices can be classified into two main types: sectional matrices and circumferential matrices.
- Explain the purpose of a sectional matrix.
- Answer: Sectional matrices are used to restore individual teeth, providing a tight seal for the restoration by adapting to the tooth’s natural contours.
- When would you use a circumferential matrix?
- Answer: Circumferential matrices are used when restoring multiple adjacent teeth to create a continuous contact area and contour.
- What materials are commonly used for dental matrices?
- Answer: Dental matrices are often made of stainless steel, plastic, or mylar. Viva Question and Answers Related to Instruments Used in Conservative and Endodontics
- How do you select the appropriate matrix band size for a restoration?
- Answer: The matrix band size is selected based on the tooth being restored, and it should extend slightly beyond the mesial and distal surfaces of the tooth.
- Explain the term “dead soft” in relation to matrix bands.
- Answer: “Dead soft” refers to matrix bands that are highly flexible and easily adapt to tooth contours for a snug fit during the restoration process.
- What is the purpose of a matrix retainer?
- Answer: A matrix retainer holds the matrix band in place around the tooth, providing stability during the placement of dental restorations.
- How do you prevent gingival overhangs when using dental matrices?
- Answer: Proper placement and adaptation of the matrix band, along with careful condensation of the restorative material, can help prevent gingival overhangs.
- What is the significance of achieving proper contact points with dental matrices?
- Answer: Proper contact points help prevent food impaction, maintain oral hygiene, and contribute to the stability of the restoration.
- How do you contour a matrix band for an anterior tooth restoration?
- Answer: Contouring a matrix band for an anterior tooth involves shaping it to mimic the natural curvature of the tooth, ensuring a proper fit. Viva Question and Answers Related to Instruments used in Pedodontics.
- Why is matrix adaptation essential during a dental restoration procedure?
- Answer: Matrix adaptation ensures that the matrix band conforms closely to the tooth’s anatomy, preventing the escape of restorative material and achieving a tight contact.
- Discuss the challenges associated with using a matrix system in posterior teeth.
- Answer: Posterior teeth pose challenges due to their complex anatomy and tight interproximal spaces, making proper matrix placement and adaptation crucial.
- How do you manage a situation where the matrix is too tight and causes discomfort to the patient?
- Answer: If the matrix is too tight, it should be carefully adjusted to alleviate discomfort without compromising the quality of the restoration. Viva Question and Answers Related to Instruments used in Prosthodontics
- What is the purpose of a wedge in dental matrix systems?
- Answer: Wedges are used to create separation between adjacent teeth, ensuring a proper seal and preventing overhangs during the restoration process.
- How do you choose the appropriate wedge size for a specific restoration?
- Answer: The wedge size is selected based on the interproximal space and should be large enough to create adequate separation without causing damage.
- Discuss the importance of proper matrix removal after a restoration.
- Answer: Proper matrix removal is crucial to avoid damaging the restoration and ensuring that no remnants of the matrix material are left behind.
- What role does the dental assistant play in assisting with dental matrices during restorative procedures?
- Answer: The dental assistant assists by providing the necessary instruments, holding the matrix in place, and ensuring a smooth workflow during the restoration procedure.
- How can you prevent contamination when using dental matrices in restorative dentistry?
- Answer: Proper isolation with a rubber dam, maintaining a dry field, and using appropriate matrix materials can help prevent contamination during restorative procedures. Viva Question and Answers Related to Instruments used in Oral Surgery
