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Questions and Answers
Where is the dental laboratory typically located in a dental office?
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 material is most commonly used to create dental models?
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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?
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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?
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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.
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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.
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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.
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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.
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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.
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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.
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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.
