Podcast
Questions and Answers
What is a colloid?
What is a colloid?
- A gelatinous material used to obtain impressions (correct)
- A solid material used to create molds
- A type of metal used in dental tools
- A liquid with no viscosity
What is the process of border molding?
What is the process of border molding?
The process of using your fingers to achieve a closer adaption of the edges of an impression.
What are elastomeric materials?
What are elastomeric materials?
Materials with elastic properties and are made from rubber.
What is the base in relation to impression materials?
What is the base in relation to impression materials?
What does 'centric' mean in dental terms?
What does 'centric' mean in dental terms?
What is agar?
What is agar?
What is syneresis?
What is syneresis?
What does tempering refer to?
What does tempering refer to?
What does viscosity describe?
What does viscosity describe?
What is alginate known for in dentistry?
What is alginate known for in dentistry?
What is hysteresis in the context of materials?
What is hysteresis in the context of materials?
What does 'hydro' refer to?
What does 'hydro' refer to?
What is occlusal registration?
What is occlusal registration?
What is a catalyst?
What is a catalyst?
What is imbibition?
What is imbibition?
What is a negative reproduction?
What is a negative reproduction?
What is bite registration?
What is bite registration?
What is a quadrant in dental impressions?
What is a quadrant in dental impressions?
What does perforated refer to in impression trays?
What does perforated refer to in impression trays?
What is a custom tray?
What is a custom tray?
What is rope wax used for?
What is rope wax used for?
What is seaweed in the context of dental materials?
What is seaweed in the context of dental materials?
What is a strong gag reflexive?
What is a strong gag reflexive?
What is the ratio for a maxillary impression?
What is the ratio for a maxillary impression?
What is alginate also known as?
What is alginate also known as?
What is a mixing bowl used for?
What is a mixing bowl used for?
What is a conditioning bath?
What is a conditioning bath?
What type of impression do elastomeric materials create?
What type of impression do elastomeric materials create?
What are the ways elastomeric materials are supplied?
What are the ways elastomeric materials are supplied?
What is light body material?
What is light body material?
What is a rubber base also known as?
What is a rubber base also known as?
What does an extruder with tip or COE syringe do?
What does an extruder with tip or COE syringe do?
What is an automix system?
What is an automix system?
What is baseplate wax?
What is baseplate wax?
What tray type is most commonly selected when polysiloxane bite registration material is used?
What tray type is most commonly selected when polysiloxane bite registration material is used?
What should baseplate wax be done before placement in the patient's mouth?
What should baseplate wax be done before placement in the patient's mouth?
What should a dental assistant be doing while the dentist is dispensing the syringe material around the prepared tooth?
What should a dental assistant be doing while the dentist is dispensing the syringe material around the prepared tooth?
What should be done to a preliminary impression before transport to the lab?
What should be done to a preliminary impression before transport to the lab?
What are the three classifications of impressions?
What are the three classifications of impressions?
Who takes preliminary impressions?
Who takes preliminary impressions?
What are preliminary impressions used for?
What are preliminary impressions used for?
Who takes bite registrations?
Who takes bite registrations?
What do bite registrations provide?
What do bite registrations provide?
What is the purpose of impression trays?
What is the purpose of impression trays?
Why are impression trays sufficiently rigid?
Why are impression trays sufficiently rigid?
What are the basic types of impression trays?
What are the basic types of impression trays?
What is utility wax used for?
What is utility wax used for?
When should utility wax be added to trays?
When should utility wax be added to trays?
What is alginate also known as?
What is alginate also known as?
What is the most common way alginate is purchased?
What is the most common way alginate is purchased?
What are premeasured, individual packages of alginate?
What are premeasured, individual packages of alginate?
What changes can alginate have?
What changes can alginate have?
What is the shelf life of alginate?
What is the shelf life of alginate?
What conditions can cause alginate to deteriorate quickly?
What conditions can cause alginate to deteriorate quickly?
What are the types of alginate setting?
What are the types of alginate setting?
What is the best temperature of water used for mixing alginate?
What is the best temperature of water used for mixing alginate?
What happens when using cooler water for mixing alginate?
What happens when using cooler water for mixing alginate?
What happens when using warmer water for mixing alginate?
What happens when using warmer water for mixing alginate?
How should alginate impressions be explained to patients?
How should alginate impressions be explained to patients?
What can help the patient relax and be more comfortable during the procedure?
What can help the patient relax and be more comfortable during the procedure?
Where should the impression tray be centered?
Where should the impression tray be centered?
What are specific criteria for evaluating an alginate impression?
What are specific criteria for evaluating an alginate impression?
What does overseating result in?
What does overseating result in?
What is reversible hydro colloid made of?
What is reversible hydro colloid made of?
What are specialized conditioning baths used for?
What are specialized conditioning baths used for?
What is the first bath used for?
What is the first bath used for?
What is the second bath for in reversible hydro colloid?
What is the second bath for in reversible hydro colloid?
What is the third temperature kept at in separate bath?
What is the third temperature kept at in separate bath?
When are elastomeric materials used?
When are elastomeric materials used?
What does 'elastomeric' mean?
What does 'elastomeric' mean?
What is polymerization?
What is polymerization?
What happens during the first set in the curing reaction?
What happens during the first set in the curing reaction?
What occurs during the final set of the curing reaction?
What occurs during the final set of the curing reaction?
What is the final cure in the context of curing reactions?
What is the final cure in the context of curing reactions?
What are some mixing techniques used for impression materials?
What are some mixing techniques used for impression materials?
What is the most common mixing sequence?
What is the most common mixing sequence?
What is the mixing unit system?
What is the mixing unit system?
What is polysiloxane bite registration paste?
What is polysiloxane bite registration paste?
What is zinc oxide eugenol bite registration paste?
What is zinc oxide eugenol bite registration paste?
Study Notes
Impression Materials Overview
- Colloid refers to a gelatinous material specifically utilized for obtaining impressions in dental practice.
- Border molding is the technique of manipulating the edges of an impression for better adaptation using fingers.
- Elastomeric materials have rubber-like elastic properties and are crucial for accurate dental impressions.
- The term "base" indicates the foundational component or primary ingredient of a material used in impressions.
Dental Terminology
- Centric describes the positioning where maxillary teeth align over mandibular teeth.
- Agar is a type of hydrocolloid material derived from seaweed, often used in impressions.
- Syneresis is the phenomenon where a material loses water, leading to shrinkage.
- Tempering is the process of adjusting a material to a specific temperature and consistency.
- Viscosity characterizes the resistance of fluids to flow, impacting how impressions behave.
Types of Materials and Impressions
- Alginate is the preferred material for preliminary impressions in dental settings, categorized as irreversible hydrocolloid.
- Hysteresis refers to the phase change of a material from one physical state to another.
- Occlusal registration captures the bite with wax or elastomeric materials and is essential for dental technicians.
Processing and Usage
- Catalyst speeds up the chemical reaction in materials used for impressions.
- Imbibition indicates the absorption of water leading to swelling in materials.
- A negative reproduction occurs when an impression captures the shape of the oral structures.
- Impression trays hold impression materials in place and come in stock or custom types.
Types of Trays
- Quadrant trays cover half of the dental arch and can be perforated for better material adherence.
- Custom trays are tailored to fit individual patients, enhancing the quality of the impression.
- Utility wax extends the length of trays for accommodating dental structures like third molars.
- Impression trays must be sufficiently rigid to carry materials into the oral cavity without distortion.
Guidelines for Alginate Use
- Alginate can be premeasured and packaged to save preparation time and ensure accuracy.
- The optimal mixing ratio for a maxillary impression is three scoops of water to three scoops of powder.
- Refrigeration and exposure to moisture can quickly deteriorate alginate, leading to improper setting.
- Alginate typically maintains a shelf life of around one year.
Temperature Influence on Setting
- Mixing alginate with water at room temperature (21°C or 70°F) is ideal.
- Cooler water increases setting time, whereas warmer water reduces it, impacting the impression process.
- Patients may experience the cooling sensation of alginate during the impression process, which is generally non-offensive.
Evaluation of Impressions
- Key criteria for evaluating alginate impressions include:
- Proper centering over incisors.
- Complete peripheral roll capturing vestibular areas.
- Absence of overseating, tears, or voids.
- Accurate reproduction of anatomical details like frenums and ridges.
Reversible Hydrocolloid Materials
- Composed primarily of water and agar (~85% water, 13% agar).
- Specialized conditioning baths transition reversible hydrocolloid from one consistency to another for accurate impressions.
Elastomeric Materials and Their Properties
- Elastomeric materials are key for cases where precise impressions are required; they exemplify rubber-like elasticity.
- Polymerization is the curing reaction that changes the material from paste to a rubbery state, involving multiple steps.
Bite Registration Materials
- Polysiloxane bite registration paste is widely used for capturing occlusal relationships and is available in cartridge systems.
- Zinc oxide eugenol (ZOE) paste offers durability for bite registrations when necessary.
Final Notes on Impression Procedures
- Mixing techniques for impression materials may vary, but commonly involve preparing light-bodied material first, followed by heavy-bodied material.
- Proper infection control and disposal of materials are essential for maintaining a hygienic dental practice.
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Description
Test your knowledge on chapter 46 related to impression materials used in dentistry. This quiz covers important terms like colloid, border molding, and elastomeric materials. Perfect for dental students or professionals looking to refresh their understanding.
