Dental Waxes
Composed mainly of beeswax, paraffin, and coloring matter, this sheet-form wax is widely used for denture wax-ups.
What is baseplate wax?
Investments are universally composed of these two fundamental components: a binder and a heat-resistant substance known as this.
What is a refractory?
Known universally as acrylic resin, this is the exact chemical name for the most common plastic material used to make denture bases.
What is methyl methacrylate?
Gold holds the crown as the absolute most malleable of all dental metals, meaning it can sustain incredible extension in all directions without doing this.
What is breaking?
Because a gelled hydrocolloid material quickly alters its dimensions when exposed to air, its impression must be poured within this many minutes of setting.
What is 10 minutes?
Demanding the highest accuracy of any dental wax, this category is used for waxing inlays, crowns, and partial denture frames.
What is inlay wax?
Overheating a gypsum-bound investment mold past its recommended limits will release this gas, making the final metal casting brittle.
What is sulfur dioxide?
This is the precise scientific term for the chemical reaction and curing process that occurs when the powder polymer and liquid monomer harden together.
What is polymerization?
The ADA master classification system dictates that an alloy must contain a combined gold and platinum group percentage greater than or equal to 60% to earn this tier.
What is High Noble?
Reversible and irreversible hydrocolloids give off a fluid exudate that can cause the surface of poured gypsum casts to turn into this undesirable state.
What is soft and chalky?
This unpigmented variety of inlay wax is used specifically for acrylic jackets because it leaves no residue that could discolor the resin.
What is Ivory (or White) wax?
Because conventional molten gold shrinks by approximately this percentage upon cooling, casting investments must expand precisely to compensate.
What is 1.4 percent?
If a denture flask is heated too rapidly, the liquid monomer will boil at this approximate Fahrenheit temperature, yielding a ruined, porous resin.
What is 212 °F?
This dangerous, toxic element is occasionally added to base-metal alloys to act as a hardener and castability improver, though it is often omitted due to health risks.
What is beryllium?
Immersing a reversible hydrocolloid impression in a 2-percent solution of potassium sulfate to enhance cast surface quality is known as this lab step.
What is fixing?
Characterized by breaking with a sharp "snap" at room temperature, this processing wax is used to hold broken prosthetic pieces together tightly.
What is sticky wax?
High-heat casting or soldering procedures exceeding 1950 °F require investments bound with silicate or this type of compound.
What is phosphate? (Phosphate-bound investments)
To prevent the acrylic resin from bonding to the plaster mold, this common type of liquid film separator is painted into the mold design.
What is a tin-foil substitute (or alginate separator)?
This specific layer of dental porcelain contains large amounts of zirconium and tin oxide to mask out the dark color of an underlying metal substructure.
What is opaque porcelain?
When pouring an exceptionally fluid plaster or stone mix into a hydrocolloid impression, a technician will often mix it with more than the standard amount of this.
What is water?
Made of beeswax, resin, and kaolin, this specialty lab wax is built up around an abutment tooth and easily carved using surveying tools.
What is undercut (or blockout) wax?
While investments containing high amounts of cristobalite expand aggressively, investments high in this refractory substance expand much less, making it ideal for soldering.
What is quartz?
To ensure excess polymerization heat is dissipated correctly, technicians are advised to raise the curing water bath at a slow rate of this many degrees per minute.
What is 1 °F per minute?
To create a dense porcelain crown free of weak voids, technicians use methods like vibration or capillary action to perform this water-and-air-removing step.
What is condensation?
Due to modern advancements in elastomers and hydrocolloids, impression plaster is rarely used today except for making these two types of indices.
What are bite registrations and solder indexes?