Podcast
Questions and Answers
What is a key characteristic of condensation polymerization?
What is a key characteristic of condensation polymerization?
- The final mers are larger than the original.
- All atoms remain unchanged in the final product.
- Significant expansion occurs upon curing.
- Byproducts produced include water or alcohol. (correct)
Which stage of polymerization involves the attachment of monomers to the growing chain?
Which stage of polymerization involves the attachment of monomers to the growing chain?
- Activation
- Termination
- Propagation (correct)
- Initiation
What occurs during the termination stage of polymerization?
What occurs during the termination stage of polymerization?
- Energy is continually added to maintain growth.
- Reactive centers are neutralized to stop growth. (correct)
- An external initiator activates the reaction.
- Residual monomers are introduced into the mixture.
What type of polymerization is characterized by little shrinkage during curing?
What type of polymerization is characterized by little shrinkage during curing?
Which type of acrylic is known for curing through heat?
Which type of acrylic is known for curing through heat?
What is the primary initiator activated during the heat curing process?
What is the primary initiator activated during the heat curing process?
Which method of curing is primarily used for repairing acrylic and soft denture liners?
Which method of curing is primarily used for repairing acrylic and soft denture liners?
What key characteristic distinguishes thermosetting polymers from thermoplastics?
What key characteristic distinguishes thermosetting polymers from thermoplastics?
What factor is NOT a common cause of bubble formation during the curing process?
What factor is NOT a common cause of bubble formation during the curing process?
Which activator is used in the light polymerizing curing method?
Which activator is used in the light polymerizing curing method?
Which type of wax is considered to have a high melting point and is plant-based?
Which type of wax is considered to have a high melting point and is plant-based?
What is a characteristic of synthetic waxes compared to natural waxes?
What is a characteristic of synthetic waxes compared to natural waxes?
Which wax is primarily used for creating patterns in the lost wax casting technique?
Which wax is primarily used for creating patterns in the lost wax casting technique?
What is a common property of dental wax?
What is a common property of dental wax?
Which wax is described as brittle and has a moderate melting point?
Which wax is described as brittle and has a moderate melting point?
What is the primary use of occlusal registration wax?
What is the primary use of occlusal registration wax?
What distinguishes impression waxes from pattern waxes?
What distinguishes impression waxes from pattern waxes?
What is the primary purpose of inlay casting wax?
What is the primary purpose of inlay casting wax?
Which of the following properties is essential for a wax used in partial denture patterns?
Which of the following properties is essential for a wax used in partial denture patterns?
Which wax type is used primarily for boxing in dental lab work?
Which wax type is used primarily for boxing in dental lab work?
What characteristic distinguishes sticky wax from other types of wax?
What characteristic distinguishes sticky wax from other types of wax?
What is the function of sprue wax in dental applications?
What is the function of sprue wax in dental applications?
Which property is NOT essential for the inlay casting wax mentioned in the content?
Which property is NOT essential for the inlay casting wax mentioned in the content?
What is the main disadvantage of using sticky wax?
What is the main disadvantage of using sticky wax?
Which type of wax is specifically designed for creating tactile sensations in dental frameworks?
Which type of wax is specifically designed for creating tactile sensations in dental frameworks?
What is the primary consequence of failing to seal gypsum adequately?
What is the primary consequence of failing to seal gypsum adequately?
What is the first historical use of Polymethyl Methacrylate (PMMA)?
What is the first historical use of Polymethyl Methacrylate (PMMA)?
How does cross-linking affect polymers?
How does cross-linking affect polymers?
Which of the following describes a copolymer?
Which of the following describes a copolymer?
What effect does higher molecular weight have on polymers?
What effect does higher molecular weight have on polymers?
What happens during polymerization?
What happens during polymerization?
Flashcards
Dental Wax
Dental Wax
A mixture of different waxes and additives used in dentistry for various purposes, including casting, denture bases, and jaw relation registration.
Natural Waxes
Natural Waxes
Organic compounds with variable melting points and properties, possibly containing impurities, derived from natural sources.
Impression Waxes
Impression Waxes
Used for taking accurate impressions, often used with alginate to improve peripheral molding and patient comfort. They may be soft or pliable.
Pattern Waxes
Pattern Waxes
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Lost Wax Technique
Lost Wax Technique
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Baseplate Wax
Baseplate Wax
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Border Wax
Border Wax
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Synthetic Waxes
Synthetic Waxes
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Inlay casting wax
Inlay casting wax
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Partial denture wax patterns
Partial denture wax patterns
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Processing waxes
Processing waxes
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Utility wax
Utility wax
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Beading wax
Beading wax
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Sprue wax
Sprue wax
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Undercut/Blockout wax
Undercut/Blockout wax
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Wax for maxillary major connectors
Wax for maxillary major connectors
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Condensation Polymerization
Condensation Polymerization
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Addition Polymerization
Addition Polymerization
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Initiation (Polymerization)
Initiation (Polymerization)
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Propagation (Polymerization)
Propagation (Polymerization)
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Termination (Polymerization)
Termination (Polymerization)
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Heat Curing
Heat Curing
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Cold Cure/Self Cure
Cold Cure/Self Cure
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Light Polymerizing
Light Polymerizing
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Thermoplastics
Thermoplastics
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Thermosetting
Thermosetting
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Incisive Papillae
Incisive Papillae
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Bite Block
Bite Block
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Polymers
Polymers
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PMMA (Polymethyl Methacrylate Acrylic)
PMMA (Polymethyl Methacrylate Acrylic)
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Mer
Mer
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Cross-Linking
Cross-Linking
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Molecular Weight
Molecular Weight
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Polymerization
Polymerization
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Study Notes
Types of Dental Waxes
- Baseplate wax
- Border wax
- Box wax
- Card wax
- Corrective impression wax
- Inlay pattern wax
- Occlusal registration wax
- Resin wax
Wax Properties
- Amorphous materials with high molecular weight and low surface energy
- Low thermal conductivity
- High heat capacity
- Insoluble in water
- Made up of two or more different waxes with additives (natural and synthetic)
Wax Components
- Gums
- Fats
- Fatty acids
- Oils
- Resins
- Pigments
Wax Uses
- Casting
- Constructing non-metallic denture bases
- Registering jaw relations
- Laboratory work
Natural Waxes
- Organic compounds
- Melting range varies due to impurities
- Carnauba wax: hard, high melting point, plant-based (flakes on leaves)
- Beeswax: plant-based, hard-melting
Impression Waxes
- Originally used for impressions
- Does not work well with undercuts
- Soft waxes used on stock trays with alginate to improve peripheral border molding (aid in comfort)
- Pliable, can be used without heating
Pattern Waxes
- Used to form patterns for lost wax casting techniques (e.g., crowns, bridges, partial dentures)
- Used in the lost wax technique: wax is removed, replaced with acrylic or ceramic
Lost Wax Technique
- First introduced in 1907
- Direct technique: wax molded in patient's mouth
- Indirect technique: wax formed on a model in the lab
Inlay Casting Waxes
- Paraffin, gum dammar, carnauba
- Must be strong, stable
- Must create fine detail, easily carved without flaking
- Burnout cleanly (no residue)
- Partial denture wax patterns
Other Wax Types
- Brittle waxes.
- Moderate melting point
- Soft paraffin wax: low melting point, petroleum based
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