Types of Dental Waxes Overview

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Questions and Answers

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?

  • Activation
  • Termination
  • Propagation (correct)
  • Initiation

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?

<p>Addition polymerization (B)</p> Signup and view all the answers

Which type of acrylic is known for curing through heat?

<p>Heat cure (C)</p> Signup and view all the answers

What is the primary initiator activated during the heat curing process?

<p>Benzoyl peroxide (D)</p> Signup and view all the answers

Which method of curing is primarily used for repairing acrylic and soft denture liners?

<p>Cold cure/auto-polymerization (D)</p> Signup and view all the answers

What key characteristic distinguishes thermosetting polymers from thermoplastics?

<p>They solidify during fabrication and cannot be softened again. (A)</p> Signup and view all the answers

What factor is NOT a common cause of bubble formation during the curing process?

<p>Using overly hard acrylic (B)</p> Signup and view all the answers

Which activator is used in the light polymerizing curing method?

<p>Camphoroquinine (C)</p> Signup and view all the answers

Which type of wax is considered to have a high melting point and is plant-based?

<p>Carnauba (B)</p> Signup and view all the answers

What is a characteristic of synthetic waxes compared to natural waxes?

<p>Uniform quality (A)</p> Signup and view all the answers

Which wax is primarily used for creating patterns in the lost wax casting technique?

<p>Inlay pattern wax (C)</p> Signup and view all the answers

What is a common property of dental wax?

<p>Low surface energy (C)</p> Signup and view all the answers

Which wax is described as brittle and has a moderate melting point?

<p>Beeswax (D)</p> Signup and view all the answers

What is the primary use of occlusal registration wax?

<p>Registering jaw relations (B)</p> Signup and view all the answers

What distinguishes impression waxes from pattern waxes?

<p>Pattern waxes are meant for lost wax casting techniques. (D)</p> Signup and view all the answers

What is the primary purpose of inlay casting wax?

<p>To facilitate the formation of fine details in dental restorations (B)</p> Signup and view all the answers

Which of the following properties is essential for a wax used in partial denture patterns?

<p>Flexibility and the ability to create complex shapes (C)</p> Signup and view all the answers

Which wax type is used primarily for boxing in dental lab work?

<p>Utility wax (C)</p> Signup and view all the answers

What characteristic distinguishes sticky wax from other types of wax?

<p>It is used for temporary luting and has a toffee color. (B)</p> Signup and view all the answers

What is the function of sprue wax in dental applications?

<p>To create channels for metal or other materials to enter the mold (D)</p> Signup and view all the answers

Which property is NOT essential for the inlay casting wax mentioned in the content?

<p>Must have a low melting point (A)</p> Signup and view all the answers

What is the main disadvantage of using sticky wax?

<p>It does not clean off easily once applied. (B)</p> Signup and view all the answers

Which type of wax is specifically designed for creating tactile sensations in dental frameworks?

<p>Veined wax (C)</p> Signup and view all the answers

What is the primary consequence of failing to seal gypsum adequately?

<p>It will lead to the flow of gypsum or result in porosity. (C)</p> Signup and view all the answers

What is the first historical use of Polymethyl Methacrylate (PMMA)?

<p>As a glass substitute. (C)</p> Signup and view all the answers

How does cross-linking affect polymers?

<p>It adds strength and stiffness to the structure. (D)</p> Signup and view all the answers

Which of the following describes a copolymer?

<p>A polymer made from two or more different kinds of monomers. (D)</p> Signup and view all the answers

What effect does higher molecular weight have on polymers?

<p>It increases stiffness and brittleness. (B)</p> Signup and view all the answers

What happens during polymerization?

<p>Low molecular weight substances are converted into high molecular weight chains. (B)</p> Signup and view all the answers

Flashcards

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

Organic compounds with variable melting points and properties, possibly containing impurities, derived from natural sources.

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

Used for constructing wax patterns used in the lost-wax casting technique for metal restorations, which are then replaced with a different material.

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Lost Wax Technique

A technique used in dental labs to create metal restorations by melting away wax patterns and replacing them with metal or other materials.

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Baseplate Wax

A type of dental wax used for constructing non-metallic denture bases.

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Border Wax

A type of dental wax used to create precise borders on impressions.

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Synthetic Waxes

Dental waxes produced with controlled processes, which results in uniform quality and consistent properties.

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Inlay casting wax

Wax used in dental labs for making dental restorations, characterized by strength, stability, fine detail, easy carving, and clean burnout (no residue).

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Partial denture wax patterns

Wax used to create complex shapes for partial dentures, focusing on accuracy and flexibility, often used for clasps and bars.

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Processing waxes

Dental waxes used in the dental lab process, not the final prosthesis, aiding in lab tasks like boxing, creating borders and isolation.

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Utility wax

White processing wax used for creating borders and bases for dental lab preparation, known for its pliable quality.

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Beading wax

Red processing wax used in the dental lab, pliable and sticky to isolate surfaces, providing borders for dental lab materials.

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Sprue wax

Wax channels used to create pathways for metal, ceramic, or acrylic to flow into dental restorations, creating tube-like passages.

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Undercut/Blockout wax

Very hard wax used in dental lab procedures to create specific shapes and defined areas.

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Wax for maxillary major connectors

Pattern waxes used for the surface of maxillary major connectors, in dental labs to ensure accurate fit and design.

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Condensation Polymerization

A type of polymerization where small molecules, like water or alcohol, are released as a byproduct, resulting in a final polymer with smaller mers than the original monomers.

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Addition Polymerization

A polymerization process where all atoms of the monomers are incorporated into the final polymer without any byproducts, leading to less shrinkage.

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Initiation (Polymerization)

The first step in polymerization where an external source (heat, light, or chemicals) activates a monomer, creating an active site that allows other monomers to attach.

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Propagation (Polymerization)

The stage where monomers continually attach to the growing polymer chain, adding to its length without the need for additional energy.

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Termination (Polymerization)

The final step in polymerization where the reactive center of the growing polymer chain is neutralized, stopping its growth.

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Heat Curing

A method of curing acrylic resins using heat and pressure, activating the initiator Benzoyl Peroxide (BPO).

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Cold Cure/Self Cure

A method of curing acrylic resins using a chemical activator (dimethyl-p-toluidine) to activate the initiator BPO. This process occurs at room temperature.

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Light Polymerizing

Acrylic resins are cured using light, typically a blue light source, to activate the initiator camphoroquinone.

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Thermoplastics

Polymers that can be softened by heat and pressure, then cooled without changing their chemical composition.

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Thermosetting

Polymers that solidify during fabrication and cannot be softened by heat without altering their chemical composition.

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Incisive Papillae

The sensitive tissue located in the front of the mouth, between the front teeth, which can be irritated by pressure or certain materials.

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Bite Block

A temporary device made of wax that prevents teeth from coming together during a dental procedure, particularly on patients with most or all of their teeth.

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Polymers

Long, chain-like molecules made up of repeating units called monomers, these units are joined together to form large structures.

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PMMA (Polymethyl Methacrylate Acrylic)

The first acrylic polymer used in dentistry, originally for denture bases, it's known for its strength and resistance to chewing.

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Mer

The basic building block of a polymer, a larger structure composed of oxygen, hydrogen, and carbon atoms.

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Cross-Linking

The process of joining polymer chains together with covalent bonds, increasing the overall strength and stiffness of the material.

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Molecular Weight

The mass of a molecule, determined by the number of atoms it contains; longer chains have higher molecular weight.

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Polymerization

The process of converting monomers into polymers by joining them into long, repeating chains.

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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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