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Questions and Answers
What is the function of bite registration material in the context of dentures?
What is the function of bite registration material in the context of dentures?
- To create a cushion for the gums
- To enhance the color of the denture
- To provide flexibility to the denture
- To register a patient's vertical dimensions (correct)
Which structure serves as the landmark on the hard palate that runs from the incisor area to the back of the throat?
Which structure serves as the landmark on the hard palate that runs from the incisor area to the back of the throat?
- Palatine fovea
- Retromolar pads
- Maxillary tuberosity
- Mid Palatine Raphe (correct)
What is the role of the retromolar pads in the mandibular ridge?
What is the role of the retromolar pads in the mandibular ridge?
- They determine the final fit of the denture
- They are pear or triangular shaped pads located posteriorly (correct)
- They are landmarks for the anterior ridge
- They are responsible for the movement of the tongue
What does the term 'sulcus' refer to in the context of oral anatomy?
What does the term 'sulcus' refer to in the context of oral anatomy?
Which feature is described as a small bump at the anterior of the mid palatine raphe?
Which feature is described as a small bump at the anterior of the mid palatine raphe?
What is the primary use of Type 1 impression plaster?
What is the primary use of Type 1 impression plaster?
Which type of dental stone is used for master casts in removable prosthodontics?
Which type of dental stone is used for master casts in removable prosthodontics?
What is one of the roles of accelerators in gypsum products?
What is one of the roles of accelerators in gypsum products?
Which additive is a common retardant in gypsum products?
Which additive is a common retardant in gypsum products?
What happens to the water when gypsum is heated to produce the hemihydrate?
What happens to the water when gypsum is heated to produce the hemihydrate?
What is meant by hygroscopic expansion in gypsum products?
What is meant by hygroscopic expansion in gypsum products?
What is a key characteristic of alginate as an impression material?
What is a key characteristic of alginate as an impression material?
Which type of dental gypsum has the highest strength and finest particle size?
Which type of dental gypsum has the highest strength and finest particle size?
What is the purpose of the canine line in denture setup?
What is the purpose of the canine line in denture setup?
Which structure is involved in the irreg​ular bony ridge on the lingual surface of the mandible?
Which structure is involved in the irreg​ular bony ridge on the lingual surface of the mandible?
What is the role of the vertical dimension of occlusion (VDO) in denture fabrication?
What is the role of the vertical dimension of occlusion (VDO) in denture fabrication?
During denture setup, which tooth is typically placed first?
During denture setup, which tooth is typically placed first?
What is a consequence of the loss of teeth regarding alveolar ridge?
What is a consequence of the loss of teeth regarding alveolar ridge?
What does acrylization refer to in the denture fabrication process?
What does acrylization refer to in the denture fabrication process?
Where are the lingual cusps of molars set during denture setup?
Where are the lingual cusps of molars set during denture setup?
Which factor is involved in establishing the midline during denture setup?
Which factor is involved in establishing the midline during denture setup?
What must be done first in the steps of denture fabrication?
What must be done first in the steps of denture fabrication?
What is the significance of measuring 6mm from the center of the ridge line at the mesial of the retromolar pad?
What is the significance of measuring 6mm from the center of the ridge line at the mesial of the retromolar pad?
Flashcards
Gypsum
Gypsum
Gypsum is a mineral that contains calcium sulfate dihydrate (CaSO4*2H2O) used in dentistry for making impressions, models, and dies.
Type 1 Gypsum (Impression Plaster)
Type 1 Gypsum (Impression Plaster)
Type 1 gypsum, also known as Impression Plaster, is used to take preliminary impressions and is characterized by its rigidity and fast setting time. It is also used as a luting agent for gothic arch pin tracers.
Type 2 Gypsum (Model Plaster)
Type 2 Gypsum (Model Plaster)
Type 2 gypsum, commonly known as Model Plaster, is used for preliminary casts, has rough particles, and sets slower than Type 1. It is used for creating simple models.
Types 3 & 4 Gypsum (Dental Stone)
Types 3 & 4 Gypsum (Dental Stone)
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Type 5 Gypsum (Die Stone)
Type 5 Gypsum (Die Stone)
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Gypsum Accelerators
Gypsum Accelerators
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Gypsum Retardants
Gypsum Retardants
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Setting Expansion and Hygroscopic Expansion
Setting Expansion and Hygroscopic Expansion
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Bite Registration
Bite Registration
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Maxillary Tuberosity
Maxillary Tuberosity
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Palatine Fovea
Palatine Fovea
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Posterior Palatal Seal Area (Vibrating Line)
Posterior Palatal Seal Area (Vibrating Line)
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Retromolar Pads
Retromolar Pads
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Retromylohyoid Ridge
Retromylohyoid Ridge
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Denture Set Up
Denture Set Up
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Acrylization
Acrylization
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Occlusal Plane
Occlusal Plane
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Canine Line
Canine Line
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Vertical Dimension of Rest (VDR)
Vertical Dimension of Rest (VDR)
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Potsdam
Potsdam
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High Lip Line
High Lip Line
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Low Lip Line
Low Lip Line
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Study Notes
Denture Midterm Study Notes
- Gypsum Products: Calcium sulfate dihydrate (CaSO4·2H2O) is used in various dental gypsum products.
Impression Plaster Type 1
- Use: Used for taking impressions.
- Properties: Must not have undercuts to maintain rigidity.
- Application: Used as a luting agent for intraoral gothic arch pin tracer.
- Chemical Change: Heated gypsum loses 3 water molecules to become calcium sulfate hemihydrate (CaSO4·½H2O).
- Setting: Water evaporates as steam (exothermic) to form beta-hemihydrate.
- Model Plaster Type 2: Used for preliminary casts and has rough particles.
Dental Stone Type 3 and 4
- Use: Used for master casts for removable prosthodontics (dentures, implants), and orthodontics.
- Properties: Contains modifiers to regulate setting time and expansion.
- Distinguishing Features: Can be distinguished by color from plaster; dehydrated in a solution of calcium chloride.
- Crystal Structure: Smoother crystal structure than plaster.
Dental Gypsum Type 5
- Use: For die stones and investments.
- Properties: High strength, very fine particle size; may contain binder for added strength.
Accelerators
- Examples: Potassium sulfate, NaCl (sodium chloride, a pinch of salt), and warm water.
Retardants
- Examples: Borax, and sodium citrate to increase the setting time.
Impression Materials
- Alginate: Preliminary impression material.
- Polyvinyl Siloxane (PVS): Final impression material.
- Bite Registration Impression Material: Used for bite registration.
Handling Alginate
- Disinfection: Disinfect the impression.
- Packaging: Wrap in moist paper towel to prevent drying out and preserve its form.
Lab Handling
- Disinfection: Receiver disinfects impression again.
- Inspection: Inspect impression for distortions and voids.
- Pouring: Pour with stone or plaster.
- Trimming: Trim the impression.
- Storing: Store in a ziplock bag, in a fridge for 12-72 hours.
Terminology (Edentulous Landmarks)
- Maxillary Residual Ridge: Area where teeth were; often called alveolar ridge.
- Mid Palatine Raphe: Line down the center of the palate.
- Incisive Papilla: Small bump at the anterior edge of the raphe.
- Rugae: Bumpy areas on the palate.
- Maxillary Tuberosity: Rounded area of bone at the posterior of the ridge.
- Hamular Notch: Groove posterior to the tuberosity.
- Palatine Foveae: Two depressions on either side of the raphe near the posterior of the mouth.
- Frenum: Muscle attachments to the ridge. (Buccal, Labial, Lingual).
Bite Registration
- Centric Occlusion: Point of contact of occlusal surfaces on posterior teeth.
- Centric Relation: Position of the mandibular condyle in the glenoid fossa.
- Vertical Dimension of Rest (VDO): Amount of separation between the mandible and maxilla when at rest.
Full Set Up
- Cuspid Line to Cuspid Line: Measuring the distance from cuspid to cuspid.
- Cuspid Line to Ridge: Measuring from the cuspid line to the ridge.
Custom Tray
- Position: 45-degree angle at the incisal papilla for the maxilla, 90 degrees at the center of the ridge for the mandible.
- Measurements for tray: Length (18mm), width (10mm), thickness (6mm).
- Setting Time: 4 minutes, place again for 1 minute.
Tooth Loss
- Bone Resorption: Loss of alveolar ridge due to lack of function.
- Vertical Dimension Loss: Loss of vertical dimension due to tooth loss.
- Misalignment: Teeth become misaligned.
- Overeruption Teeth erupt further into the mouth over time.
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