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Questions and Answers
What type of resin cures through a process that takes hours?
What type of resin cures through a process that takes hours?
- Heat-cured Resin (correct)
- Light-cured Resin
- Self-cured Resin
- Chemical Cured Resin
Which polymerization process does not produce by-products?
Which polymerization process does not produce by-products?
- Chain-reaction Polymerization
- Thermal Polymerization
- Addition Polymerization (correct)
- Condensation Polymerization
Which type of resin is chemically activated and cures at room temperature?
Which type of resin is chemically activated and cures at room temperature?
- Self-cured Resin (correct)
- Heat-cured Resin
- Acrylic Resin
- Light-cured Resin
What is a primary use of dental resins?
What is a primary use of dental resins?
What is the primary component of the powder used in dental polymers?
What is the primary component of the powder used in dental polymers?
What type of polymerization is known as step-growth polymerization?
What type of polymerization is known as step-growth polymerization?
What characteristic is required for addition polymerization to proceed?
What characteristic is required for addition polymerization to proceed?
Which property does Polymer Poly (Methyl Methacrylate) exhibit?
Which property does Polymer Poly (Methyl Methacrylate) exhibit?
What occurs during condensation polymerization?
What occurs during condensation polymerization?
What might cause the fracture of a denture?
What might cause the fracture of a denture?
Which of the following is NOT a cause of internal porosities in a denture base?
Which of the following is NOT a cause of internal porosities in a denture base?
What is a purpose of trimming a processed denture base?
What is a purpose of trimming a processed denture base?
What type of resin is typically used for repairing dentures?
What type of resin is typically used for repairing dentures?
What is the purpose of using tissue conditioners in dental practice?
What is the purpose of using tissue conditioners in dental practice?
Which of the following conditions would most likely require the use of soft liners in dentures?
Which of the following conditions would most likely require the use of soft liners in dentures?
What is the boiling point of methyl methacrylate?
What is the boiling point of methyl methacrylate?
What is the first step in the denture base construction process using the double-pressing technique?
What is the first step in the denture base construction process using the double-pressing technique?
Which technique is used for packing resin into the mold space?
Which technique is used for packing resin into the mold space?
During the wax elimination step, what method is recommended to soften the wax?
During the wax elimination step, what method is recommended to soften the wax?
Which material is applied to prevent monomer penetration into the investing medium?
Which material is applied to prevent monomer penetration into the investing medium?
What is the final step in the denture base construction process?
What is the final step in the denture base construction process?
Which component is NOT part of the metal flask used in investing?
Which component is NOT part of the metal flask used in investing?
What should be done after separating the upper and lower halves of the metal flask during wax elimination?
What should be done after separating the upper and lower halves of the metal flask during wax elimination?
How many layers of high fusing pink wax are typically applied for the denture base wax pattern?
How many layers of high fusing pink wax are typically applied for the denture base wax pattern?
What is the purpose of the trial closure step in denture base construction?
What is the purpose of the trial closure step in denture base construction?
What is the ideal heating temperature for the resin during the rapid curing process?
What is the ideal heating temperature for the resin during the rapid curing process?
Which of the following describes a potential consequence of cooling the flask too quickly?
Which of the following describes a potential consequence of cooling the flask too quickly?
What does crazing refer to in the context of denture processing?
What does crazing refer to in the context of denture processing?
What is a potential issue caused by external porosities on a denture base?
What is a potential issue caused by external porosities on a denture base?
How long should the assembly be placed in the water bath during the rapid curing process?
How long should the assembly be placed in the water bath during the rapid curing process?
What may happen if the heating rate of the resin is too high?
What may happen if the heating rate of the resin is too high?
What should be done after processing the denture to avoid warpage?
What should be done after processing the denture to avoid warpage?
What is a consequence of too much pressure during the curing process?
What is a consequence of too much pressure during the curing process?
What is the recommended time for bench cooling after removing the flask from the water bath?
What is the recommended time for bench cooling after removing the flask from the water bath?
Which problem can arise from internal porosities in denture bases?
Which problem can arise from internal porosities in denture bases?
What is used as a separating medium to prevent adhesion between the investing medium and the upper and lower halves of the metal flask?
What is used as a separating medium to prevent adhesion between the investing medium and the upper and lower halves of the metal flask?
What is the recommended monomer to polymer ratio by weight during the packing of resin?
What is the recommended monomer to polymer ratio by weight during the packing of resin?
In the injection molding technique, what purpose does the vent in the flask serve?
In the injection molding technique, what purpose does the vent in the flask serve?
During what stage does the mixture become stringy and adhesive?
During what stage does the mixture become stringy and adhesive?
What is the primary purpose of the monomer in the polymer process?
What is the primary purpose of the monomer in the polymer process?
What characteristic of the mold allows it to be filled properly in the injection molding technique?
What characteristic of the mold allows it to be filled properly in the injection molding technique?
What happens during the damp sand stage of the packing process?
What happens during the damp sand stage of the packing process?
What excess material issue can arise if too much resin is placed in the mold?
What excess material issue can arise if too much resin is placed in the mold?
What cleaning method is recommended for the land area created during the investment process?
What cleaning method is recommended for the land area created during the investment process?
What is an advantage of using the injection molding technique?
What is an advantage of using the injection molding technique?
Study Notes
Dental Resins: Curing and Polymerization
- Types of Dental Resins
- Heat-cured Resins: Cured by applying heat for several hours.
- Self-cured Resins: Also known as auto-polymerizing resins, cure at room temperature with chemical activation
- Light-cured Resins: Cured using halogen light.
Polymerization: The Building Blocks of Dental Resins
- Monomer: A single, small molecule
- Polymer: A large molecule formed by the repeated joining of smaller monomers.
Types of Polymerization
- Condensation Polymerization: (Step-growth polymerization)
- Monomers join together to form new molecules, releasing byproducts such as water, acids, or ammonia.
- Addition Polymerization:
- Monomers add to each other without releasing byproducts.
Uses of Dental Resins in Dentistry
- Elastomeric Impression Materials: Used to take impressions of teeth and oral tissues.
- Individual Trays: Custom trays used to create a more accurate impression for dentures.
- Denture Bases: Forms the foundation of dentures to support the artificial teeth.
- Artificial Teeth (Pontics): Used to replace missing teeth.
- Relining and Rebasing Materials: Utilized to repair and adjust the fitting of dentures over time.
- Soft Liners: Soft, cushioning materials designed to provide comfort and prevent discomfort in dentures.
- Crowns and Veneers: Used for restorations to improve the appearance of teeth.
Acrylic Resins: A Common Choice in Dentistry
- Acrylic Resins: Polymers derived from ethylene. Composed of:
- Monomer (Methyl Methacrylate): A clear, liquid component that's volatile and sensitive to light.
- Polymer: The solid component formed by polymerization.
Denture Base Construction Using the Double-Pressing Technique
- Impression Making: Process of capturing the shape and contours of the mouth to create a cast.
- Construction of the Working Cast: A replica of the patient's mouth used to create the denture base.
- Construction of a Wax Pattern: The shape of the denture base is modeled in wax.
- Investing: Placing a wax pattern in a flask (metal mold) filled with plaster or investment material.
- Wax Elimination: Removing the wax pattern from the flask to create a mold space.
- Preparation of the Mold Space: The mold is prepared to receive the resin.
- Packing Resin: The liquid resin mixed with polymer is packed into the mold space.
- Compression Molding (Dough-Molding Technique): Resin is manually packed and shaped into the mold.
- Injection Molding Technique: Resin is injected into the mold under pressure.
- Trial Closure: The two halves of the flask are brought together to verify the mold is properly packed.
- Curing: The resin is subjected to heat to solidify and harden.
- Rapid Curing: Rapid heating to cure the resin in a shorter time frame.
- Slow Curing: Slower, controlled heating method.
- De-flasking: Separating the hardened denture base from the flask.
- Trimming and Polishing: Excess resin is trimmed, and the denture base is polished for smoothness and aesthetics.
Denture Base Failures: Problems to Watch Out For
- Porosities (Holes): Can lead to weakened dentures, difficulty cleaning, and food retention.
- Internal Porosities: Located within the denture base.
- External Porosities: Located on the surface of the denture base.
Common Denture Base Defects
- Crazing (Cracks): Fine, white or hazy lines on the surface of the denture, often caused by excessive pressure during curing.
- Fracture (Breakage): Can be caused by mishandling, too much pressure during separation from the cast, or inadequate curing.
- Warpage or Distortion: Occurs when the denture base is subjected to uneven heat or pressure during processing or polishing.
Miscellaneous Resins and Techniques
- Repair Resins: Self-curing resins used to fix minor cracks or damage in dentures.
- Rebasing/Relining: Replaces the tissue surface of a denture to adapt to changes in the oral tissues or occlusion.
- Soft Liners: Provide cushioning and comfort for dentures.
- Resin Impression Trays: Custom trays for taking impressions, made from self-curing resins.
- Tissue Conditioners: Soft tissue conditioners used to alleviate discomfort and promote healing of oral tissues.
- Acrylic Resin Teeth/Pontics: Acrylic resins used in the creation of artificial teeth.
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Description
This quiz explores the various types of dental resins, their curing methods, and the basics of polymerization. Learn about heat-cured, self-cured, and light-cured resins, as well as the differences between condensation and addition polymerization. Test your understanding of these essential concepts in dental materials.
