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Viva Question and Answers Related to Glass ionomer Cement!

viva question and answers in glass ionomer cement

Here are 20 potential viva questions and answers related to glass ionomer cement:

1. Q: What is glass ionomer cement (GIC)? A: Glass ionomer cement is a dental restorative material that is based on the reaction between fluoroaluminosilicate glass powder and polyacrylic acid.

2. Q: What are the main components of glass ionomer cement? A: The main components are fluoroaluminosilicate glass powder and polyacrylic acid.

3. Q: How does the setting reaction of glass ionomer cement occur? A: The setting reaction involves an acid-base reaction between the glass powder (containing calcium and aluminum) and the polyacrylic acid, resulting in the formation of a hardened material.

4. Q: What is the advantage of the chemical adhesion of glass ionomer cement to tooth structure? A: Glass ionomer cement forms a strong chemical bond with tooth structure, promoting adhesion and reducing microleakage.

5. Q: How is the working time of glass ionomer cement controlled? A: The working time is controlled by altering the powder-to-liquid ratio, with a higher powder ratio resulting in a shorter working time.  Viva Question and Answers related to Salivary glands

6. Q: Can glass ionomer cement be used as a luting agent for crowns and bridges? A: Yes, glass ionomer cement can be used as a luting agent due to its adhesive properties and ability to chemically bond to tooth structure.

7. Q: What are the indications for using glass ionomer cement in restorative dentistry? A: Glass ionomer cement is indicated for Class III and Class V restorations, as a liner/base, and for cementing crowns and bridges.

8. Q: How does the release of fluoride from glass ionomer cement benefit the tooth? A: The release of fluoride helps prevent secondary caries by inhibiting bacterial growth and promoting remineralization of tooth structure.

9. Q: Can glass ionomer cement be used for core build-ups? A: Yes, glass ionomer cement can be used for core build-ups due to its strength and adhesion to dentin.

10. Q: What is the role of water in the setting reaction of glass ionomer cement? A: Water is essential for the setting reaction as it hydrates the glass particles, initiating the ion exchange and cross-linking process. Viva question and answers in dental caries

11. Q: How does the coefficient of thermal expansion of glass ionomer cement compare to natural tooth structure? A: The coefficient of thermal expansion of glass ionomer cement closely matches that of natural tooth structure, reducing the risk of marginal gaps.

12. Q: What are the limitations of glass ionomer cement in terms of esthetics? A: Glass ionomer cement has limited esthetics compared to other restorative materials and may not be suitable for highly visible areas.

13. Q: Can glass ionomer cement be used in load-bearing areas of the mouth? A: Glass ionomer cement has limited strength and is not recommended for use in high-load-bearing areas.

14. Q: How is the setting time of glass ionomer cement influenced by environmental factors? A: Setting time is influenced by factors such as temperature and humidity, with higher temperatures and humidity accelerating the setting process.

15. Q: Can glass ionomer cement be recharged with fluoride after placement? A: Yes, glass ionomer cement can be recharged with fluoride from topical applications or fluoride-containing products. Viva Question and Answers in Class 2 dental cavity

16. Q: What is the significance of the “initial setting time” of glass ionomer cement? A: The initial setting time is the time taken for the cement to harden sufficiently to resist displacement, and it is crucial for proper manipulation during placement.

17. Q: How does the use of glass ionomer cement contribute to minimally invasive dentistry? A: Glass ionomer cement can be used in minimally invasive procedures due to its ability to bond chemically to tooth structure, requiring less tooth preparation.

18. Q: Can glass ionomer cement be used in pediatric dentistry? A: Yes, glass ionomer cement is often used in pediatric dentistry for its fluoride-releasing properties and ease of placement.

19. Q: How does the handling of glass ionomer cement differ from resin-based composites? A: Glass ionomer cement has a different consistency and handling than resin-based composites, as it is a self-curing material and does not require a light-curing process.

20. Q: What is the role of resin-modified glass ionomer cement, and how does it differ from traditional glass ionomer cement? A: Resin-modified glass ionomer cement combines the characteristics of glass ionomer and resin-based composites, offering improved esthetics, strength, and a dual-curing mechanism. viva question and answers related to the classification of dental cements

Here are viva questions and answers specifically focused on the composition of glass ionomer cement:

1. Q: What are the main components of glass ionomer cement? A: Glass ionomer cement is composed of fluoroaluminosilicate glass powder and polyacrylic acid.

2. Q: What is the function of fluoroaluminosilicate glass powder in glass ionomer cement? A: Fluoroaluminosilicate glass powder provides the major structural component and contributes to the strength and radiopacity of glass ionomer cement.

3. Q: How is the glass powder in glass ionomer cement different from traditional glass used in other materials? A: The glass powder in glass ionomer cement is specifically formulated with fluorine and aluminum, enhancing its properties for dental applications.

4. Q: Why is polyacrylic acid used in the composition of glass ionomer cement? A: Polyacrylic acid acts as the liquid component and is essential for the setting reaction. It initiates the ion exchange and cross-linking process with the glass powder.

5. Q: What role does water play in the composition of glass ionomer cement? A: Water is necessary for the hydration of glass particles, facilitating the ion exchange between the glass powder and polyacrylic acid during the setting reaction. Dental Amalgam Restoration

6. Q: How does the ratio of powder to liquid affect the properties of glass ionomer cement? A: The powder-to-liquid ratio influences the working time and mechanical properties of the glass ionomer cement. A higher powder ratio shortens the working time but may enhance strength.

7. Q: Can you explain the ion exchange process in the setting reaction of glass ionomer cement? A: During the setting reaction, protons from the polyacrylic acid replace metal ions (such as calcium and aluminum) in the glass powder, forming a cross-linked structure.

8. Q: What is the significance of the aluminum content in the glass powder of glass ionomer cement? A: Aluminum contributes to the strength and radiopacity of glass ionomer cement. It also plays a role in the ion exchange process during setting.

9. Q: How does the size of glass particles in the powder affect the handling characteristics of glass ionomer cement? A: Finer glass particles improve the handling characteristics, such as smoothness and ease of placement, while coarser particles may affect viscosity and flow.

10. Q: Can you explain the role of the setting accelerators in the composition of glass ionomer cement? A: Setting accelerators, such as tartaric acid or maleic acid, can be added to expedite the setting reaction and reduce the initial setting time. Understanding Dry Socket: Causes, Symptoms, and Treatment

11. Q: How does the composition of glass ionomer cement contribute to its adhesion to tooth structure? A: The ion exchange during the setting reaction allows the cement to chemically bond to the hydroxyapatite in tooth structure, providing adhesion.

12. Q: Is there any difference in the composition between conventional glass ionomer cement and resin-modified glass ionomer cement? A: Yes, resin-modified glass ionomer cement contains resin components (e.g., light-curable monomers) in addition to the traditional glass ionomer components, providing dual curing.

13. Q: Why is fluoride release an important characteristic of glass ionomer cement? A: Fluoride release helps in preventing secondary caries by inhibiting bacterial activity and promoting remineralization of adjacent tooth structure.

14. Q: Can you discuss the role of strontium in some glass ionomer cement formulations? A: Strontium may be added to some formulations to replace part of the calcium content, affecting the physical properties and radiopacity of the cement.

15. Q: How does the composition of glass ionomer cement contribute to its biocompatibility? A: The biocompatibility of glass ionomer cement is attributed to the inert nature of its components, and the release of fluoride also contributes to its therapeutic benefits.

16. Q: Are there any variations in the composition of glass ionomer cement for different clinical applications? A: Yes, variations in composition exist for specific clinical applications, such as restorative glass ionomer cements, luting cements, and liner/base materials.

17. Q: How does the composition of glass ionomer cement allow for moisture tolerance during placement? A: The composition includes water, allowing glass ionomer cement to set in a moist environment. This is advantageous in clinical situations where maintaining a dry field is challenging.

18. Q: Can you explain the role of polyalkenoic acids in the polyacrylic acid component of glass ionomer cement? A: Polyalkenoic acids, such as polyacrylic acid, provide the acidity required for the setting reaction and contribute to the adhesion of the cement to tooth structure.

19. Q: What is the purpose of incorporating acrylic polymers in some glass ionomer cement formulations? A: Acrylic polymers may be added to modify the physical properties of glass ionomer cement, such as improving flexibility and reducing brittleness.

20. Q: How does the composition of glass ionomer cement address the thermal expansion mismatch with tooth structure? A: The coefficient of thermal expansion of glass ionomer cement is formulated to closely match that of natural tooth structure, reducing the risk of marginal gaps and postoperative sensitivity. Viva Questions in Dental Materials Finishing and Polishing

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