Podcast
Questions and Answers
Self cure is also known as chemical cure.
Self cure is also known as chemical cure.
True
A higher melting range is required for direct wax patterns compared to lab patterns.
A higher melting range is required for direct wax patterns compared to lab patterns.
True
Sticky wax remains flexible when heated.
Sticky wax remains flexible when heated.
False
Pattern waxes must have low flow at working temperatures to prevent distortion.
Pattern waxes must have low flow at working temperatures to prevent distortion.
Signup and view all the answers
Corrective impression wax is made from paraffin and hydrocarbon wax.
Corrective impression wax is made from paraffin and hydrocarbon wax.
Signup and view all the answers
Bite registration wax is not susceptible to distortion during removal.
Bite registration wax is not susceptible to distortion during removal.
Signup and view all the answers
The flow of bite registration wax at 37°C is between 2.5% and 25%.
The flow of bite registration wax at 37°C is between 2.5% and 25%.
Signup and view all the answers
If the melting temperature of wax is too high, it becomes easier to work with.
If the melting temperature of wax is too high, it becomes easier to work with.
Signup and view all the answers
Boxing and utility wax is soft and easily shaped.
Boxing and utility wax is soft and easily shaped.
Signup and view all the answers
Burn out without residue is an important property of pattern waxes.
Burn out without residue is an important property of pattern waxes.
Signup and view all the answers
Waxes are commonly used in the final dental restoration.
Waxes are commonly used in the final dental restoration.
Signup and view all the answers
Beeswax was historically used for creating patterns in dentistry.
Beeswax was historically used for creating patterns in dentistry.
Signup and view all the answers
The lost wax technique involves removing wax patterns by melting or burning them.
The lost wax technique involves removing wax patterns by melting or burning them.
Signup and view all the answers
Waxes have only organic components, with no synthetic materials used.
Waxes have only organic components, with no synthetic materials used.
Signup and view all the answers
The physical properties of waxes are governed by ANSI-ADA spec.4.
The physical properties of waxes are governed by ANSI-ADA spec.4.
Signup and view all the answers
Paraffin is a type of natural wax used in dentistry.
Paraffin is a type of natural wax used in dentistry.
Signup and view all the answers
Residual stress in wax patterns can adversely affect the quality of final restorations.
Residual stress in wax patterns can adversely affect the quality of final restorations.
Signup and view all the answers
Boxing waxes are categorized under processing waxes.
Boxing waxes are categorized under processing waxes.
Signup and view all the answers
Inlay wax is composed of five or six components including paraffin and carnauba.
Inlay wax is composed of five or six components including paraffin and carnauba.
Signup and view all the answers
The melting range for inlay wax indicates the temperature at which it transitions from solid to liquid.
The melting range for inlay wax indicates the temperature at which it transitions from solid to liquid.
Signup and view all the answers
Heat treatment of the carver is a method to increase residual stress in wax patterns.
Heat treatment of the carver is a method to increase residual stress in wax patterns.
Signup and view all the answers
The dimensions of baseplate wax are 15 cm long, 7.5 cm wide, and 0.13 mm thick.
The dimensions of baseplate wax are 15 cm long, 7.5 cm wide, and 0.13 mm thick.
Signup and view all the answers
Inlay wax can be used in both mouth and laboratory temperatures.
Inlay wax can be used in both mouth and laboratory temperatures.
Signup and view all the answers
Casting wax has a slight tackiness to it.
Casting wax has a slight tackiness to it.
Signup and view all the answers
Baseplate wax is only available in one type regardless of temperature.
Baseplate wax is only available in one type regardless of temperature.
Signup and view all the answers
Inlay wax measures 6 cm wide and 7.5 cm long.
Inlay wax measures 6 cm wide and 7.5 cm long.
Signup and view all the answers
Fluctuation related to water requires investment within 30 minutes.
Fluctuation related to water requires investment within 30 minutes.
Signup and view all the answers
There are no soft types of baseplate wax available.
There are no soft types of baseplate wax available.
Signup and view all the answers
Dr. Thurra Abbas documented the wax specifications on 11/17/2024.
Dr. Thurra Abbas documented the wax specifications on 11/17/2024.
Signup and view all the answers
The casting wax is designed to be completely non-tacky.
The casting wax is designed to be completely non-tacky.
Signup and view all the answers
Study Notes
Waxes in Dentistry
- Waxes are used in various aspects of dentistry, both in clinics and labs.
- They aren't used in final restorations, but are crucial for fabricating and ensuring successful metal or ceramic restorations.
- Beeswax was utilized for patterns 200 years ago.
- Waxing is a lab procedure used to create wax models that precisely match the final restoration's form and dimensions.
- Types of wax models include fillings and crowns; also, prosthetic devices made of vitallium or acrylic.
Lost Wax Technique
- The lost-wax technique uses a wax pattern to define a space within a stone-like material.
- This process eliminates the wax pattern, creating a cavity that is then filled with metal.
Requirements of Dental Wax
- The wax must perfectly match the size, shape, and contour of the intended appliance.
- It should have sufficient flow when melted to accurately reproduce fine details.
- No dimensional changes should occur after the wax is formed.
- The wax should be able to be melted without leaving any residue.
- The wax should be easily carved to produce a smooth surface.
- The wax should have distinct color contrast to facilitate proper margin finishing.
Wax Components
- Waxes can be classified as natural or synthetic.
- Natural waxes include mineral (like paraffin and ceresin), plant (such as carnauba and candelilla), and animal (like beeswax).
- Synthetic waxes are used to modify the characteristics of natural waxes, like polyethylene.
Classification of Waxes
-
Mineral waxes are refined from crude oil or petroleum.
- Paraffin wax has a relatively low melting point (50-70°C) and is brittle.
- Ceresin wax comes from petroleum and has a medium melting range (60°C).
-
Plant waxes are derived from palm trees, like carnauba, and other plants like candelilla.
- They are hard, tough, and have a high melting point (80-85°C).
-
Animal waxes are extracted from animal products.
- Stearin comes from beef fat, and has a low melting point.
- Beeswax is extracted from honeycombs, partially crystalline natural polyester, and is brittle with a medium melting temperature (60-70°C).
Properties of Waxes
- Waxes are organic molecules with high molecular weights.
- The main components are hydrocarbon (paraffin) and high molecular weight esters.
- Wax properties are regulated by ANSI-ADA specifications.
- These specifications address melting range, excess residue, flow, thermal expansion, and residual stress.
- Flow (a change in shape or dimension in response to force) is crucial.
- Wax patterns placed in casting molds are melted out; residue affects the quality of the restoration.
- The size of the material (e.g., inlay wax, baseplate wax, casting wax, and resins).
- The waxes are used in auxiliary roles during the fabrication of models, impressions, and soldering.
- There are categories of waxes used for different purposes (pattern waxes and processing waxes).
- Examples are Inlay wax, casting wax, baseplate wax, boxing wax, utility wax, and sticky wax.
- Specific wax types have different components, sizes, and melting point ranges depending on function.
Minimizing Residual Stress in Wax
- Minimize this by controlling heating during the carving process, using small increments, maintaining consistent temperature, quick investments, and refining crucial details.
- Controlling the heating to appropriate temperatures.
- Preventing environmental temperature fluctuations, by using isolation.
Important Properties of Pattern Waxes
- Low flow in working temperatures prevents distortion of the wax pattern.
- The melting range should be higher than the environment; laboratory patterns have lower melting points than directly made wax patterns.
- Excess heat can make the wax difficult to work with.
- Complete burning away without any residue is important.
Types of Waxes
- Pattern waxes are used to create models of restorations, including inlay, casting, and baseplate waxes.
- Processing waxes aid in accessory phases of model production, impressions, and soldering.
- Examples of processing waxes are boxing, utility, and sticky waxes.
- Resins have recently been used for pattern and processing materials.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
