Podcast
Questions and Answers
Where is the dental laboratory typically located in a dental office?
Where is the dental laboratory typically located in a dental office?
Which of the following specialties might have a more extensive dental laboratory setup?
Which of the following specialties might have a more extensive dental laboratory setup?
What instrument is used to determine centric relation on a diagnostic model?
What instrument is used to determine centric relation on a diagnostic model?
What material is most commonly used to create dental models?
What material is most commonly used to create dental models?
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What is the correct water-to-powder ratio of plaster?
What is the correct water-to-powder ratio of plaster?
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When mixing gypsum materials, what should be added to the water?
When mixing gypsum materials, what should be added to the water?
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After pouring an impression, how long should you wait before separating the model from it?
After pouring an impression, how long should you wait before separating the model from it?
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Which part of the dental model is typically trimmed first?
Which part of the dental model is typically trimmed first?
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A vacuum-formed tray is commonly made for a vital bleaching procedure.
A vacuum-formed tray is commonly made for a vital bleaching procedure.
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Self-cure and light-cure are methods that acrylic resin can harden.
Self-cure and light-cure are methods that acrylic resin can harden.
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Bite registration wax is commonly used to create a wall around a preliminary impression.
Bite registration wax is commonly used to create a wall around a preliminary impression.
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Thermoplastic resin is the material utilized for constructing a vacuum-formed custom tray.
Thermoplastic resin is the material utilized for constructing a vacuum-formed custom tray.
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Utility wax is used to create room in a tray for the impression material.
Utility wax is used to create room in a tray for the impression material.
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A face bow is used to grind away plaster or stone.
A face bow is used to grind away plaster or stone.
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The #7 wax spatula is the most common size used in dental laboratories.
The #7 wax spatula is the most common size used in dental laboratories.
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Impression plaster is one of the five forms of gypsum.
Impression plaster is one of the five forms of gypsum.
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You should add water to the powder when mixing gypsum materials.
You should add water to the powder when mixing gypsum materials.
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The anterior portion of the maxillary and mandibular model is trimmed the same as the other areas.
The anterior portion of the maxillary and mandibular model is trimmed the same as the other areas.
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You should wait for 30 to 45 minutes before separating the model from the impression.
You should wait for 30 to 45 minutes before separating the model from the impression.
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Gypsum materials are typically mixed in a metal bowl.
Gypsum materials are typically mixed in a metal bowl.
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Specialty practices such as orthodontics require a dental laboratory setup less extensive than general practices.
Specialty practices such as orthodontics require a dental laboratory setup less extensive than general practices.
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Study Notes
Dental Laboratory Location and Setup
- A dental laboratory is a separate space within a dental office, away from patient treatment areas
- Specialty practices like orthodontics, pediatric dentistry, and prosthodontics may have more extensive laboratories
Dental Laboratory Materials and Equipment
- A model trimmer is a tool used to grind away plaster or stone
- Impressions are considered contaminated items that should be brought into the dental laboratory
- A face bow is a dental instrument used to determine centric relation on a diagnostic model
- The #7 wax spatula is the most common size used in the laboratory
- A dental model is also known as a study cast
- Gypsum products are used to make dental models
Gypsum Materials and Mixing
- The five forms of gypsum are impression plaster, model plaster, dental stone, die stone, and high-strength stone
- The water-to-powder ratio for plaster is 100 grams of powder to 45-50 ml of water
- When mixing gypsum materials, add the powder to the water
- Gypsum materials are mixed in a specialized rubber bowl
Pouring Impressions and Model Separation
- A dental model has two main sections: the anatomic portion and the art portion
- When pouring an impression, start by placing gypsum material near the most posterior tooth in the maxillary impression
- Allow 45-60 minutes before separating the model from the impression
Model Trimming
- The maxillary model should be measured and trimmed first
- The anterior sections of the maxillary and mandibular models are trimmed differently
- A wax bite is used to position the maxillary and mandibular casts during trimming
Digital Models
- Digital models are more accurate, easier to take, have less physical storage, and are less expensive to duplicate than plaster models
Custom Trays
- A vacuum-formed tray is made for vital bleaching procedures
Dental Laboratory Location and Setup
- Dental laboratories should be in a separate space from patient treatment areas.
- Specialty practices like orthodontics, pediatric dentistry, and prosthodontics may have larger and more equipped labs.
Contaminated Items and Equipment
- Impressions are a contaminated item brought into the dental lab.
- A model trimmer is used to grind away plaster and stone, often used on dental models.
Diagnostic Models and Centric Relation
- A face bow is used to determine centric relation on diagnostic models.
- Centric relation is the most retruded position of the mandible.
Dental Model Materials and Techniques
- #7 wax spatulas are commonly used in dental labs for wax manipulation.
- Dental models are often referred to as study casts.
- Gypsum products are used to make dental models.
- Five forms of gypsum exist: impression plaster, model plaster, dental stone, die stone, and high-strength stone.
- Gypsum materials mix at a water-to-powder ratio (g/ml) of 100 g of powder to 45 to 50 ml of water.
- When mixing, always add powder to water, not the other way around.
- Mixing of gypsum takes place in specialized rubber bowls.
- Dental models consist of two parts: the anatomic portion (replica of teeth and tissues) and the art portion (base for stabilization).
Pouring and Trimming Models
- When pouring impressions, start with the most posterior tooth in the maxillary impression.
- Wait 45 to 60 minutes before separating the model from the impression.
- The maxillary model is measured and trimmed first, followed by the mandibular model.
- The anterior portion of the maxillary and mandibular models are trimmed differently.
- A wax bite should be placed between the maxillary and mandibular models during trimming.
Comparison of Digital and Conventional Models
- Digital models offer advantages over conventional models, including improved accuracy, ease of acquisition, reduced storage space, and cost-effective duplication.
Custom Trays and Acrylic Resin
- Vacuum-formed trays are used for vital bleaching procedures.
- Acrylic resin can harden through self-curing or light-curing methods.
Vacuum-Formed Trays and Thermoplastic Resin
- Thermoplastic resin is used for vacuum-formed custom trays.
Spacers and Undercut Correction
- Spacers create room in a tray for impression material.
- Undercuts are corrected by filling with wax or molding material.
Boxing Wax, Utility Wax, and Bite Registration Wax
- Boxing wax is used to create a wall around a preliminary impression when pouring it up.
- Utility wax extends an impression tray.
- Bite registration wax is used to record a patient's bite.
Inlay Casting Wax
- Inlay casting wax is widely used to create patterns for indirect restorations.
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Description
This quiz focuses on the setup and essential materials used in a dental laboratory. Topics include dental laboratory location, equipment, gypsum materials, and mixing techniques. Gain insights into tools crucial for various specialties in dentistry and their applications.
