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Questions and Answers
What is the primary goal of prosthodontics?
What is the primary goal of prosthodontics?
What is the first step in the pathway of complete denture construction?
What is the first step in the pathway of complete denture construction?
Which area is classified as a stress-bearing area in denture construction?
Which area is classified as a stress-bearing area in denture construction?
Which tissue primarily supports the denture base?
Which tissue primarily supports the denture base?
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What characteristic differentiates primary stress-bearing areas from relief areas?
What characteristic differentiates primary stress-bearing areas from relief areas?
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In comparing edentulous maxillae to edentulous mandible, which statement is correct?
In comparing edentulous maxillae to edentulous mandible, which statement is correct?
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Why is the buccal shelf considered a primary stress-bearing area?
Why is the buccal shelf considered a primary stress-bearing area?
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Which of the following statements is false regarding the foundation for dentures?
Which of the following statements is false regarding the foundation for dentures?
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What technique is typically used for recording the mucosa in most maxillary cases?
What technique is typically used for recording the mucosa in most maxillary cases?
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Which factor does NOT influence the control of tissue displacement during impression taking?
Which factor does NOT influence the control of tissue displacement during impression taking?
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What is the primary material used to fabricate the primary cast from the primary impression?
What is the primary material used to fabricate the primary cast from the primary impression?
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In mandibular cases, which technique is usually employed for recording the mucosa?
In mandibular cases, which technique is usually employed for recording the mucosa?
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What is the relationship between a perfect cast and the impression technique used?
What is the relationship between a perfect cast and the impression technique used?
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What is the ideal size of an edentulous stock tray in relation to the residual ridge?
What is the ideal size of an edentulous stock tray in relation to the residual ridge?
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Which of the following materials is NOT suitable for making impressions with a stock tray?
Which of the following materials is NOT suitable for making impressions with a stock tray?
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What consequence might occur if a stock tray is selected that is too large?
What consequence might occur if a stock tray is selected that is too large?
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Why is alginate considered dimensionally unstable?
Why is alginate considered dimensionally unstable?
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What is the recommended extent for a mandibular stock tray?
What is the recommended extent for a mandibular stock tray?
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What advantage does a high viscosity impression material provide?
What advantage does a high viscosity impression material provide?
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What is the preferred practice when it comes to the borders of a preliminary impression?
What is the preferred practice when it comes to the borders of a preliminary impression?
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What happens to the impression compound when it cools after being removed from the patient's mouth?
What happens to the impression compound when it cools after being removed from the patient's mouth?
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Which characteristic is true of silicone putty compared to impression compound?
Which characteristic is true of silicone putty compared to impression compound?
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What modification can be made to a stock tray to improve impression quality if it has deficiencies?
What modification can be made to a stock tray to improve impression quality if it has deficiencies?
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What is the effect of a high viscosity on the silicone putty during impression taking?
What is the effect of a high viscosity on the silicone putty during impression taking?
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What additional step should be taken to ensure accurate replication of the sulcus in the impression?
What additional step should be taken to ensure accurate replication of the sulcus in the impression?
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Why is immediate pouring of the impression recommended after using impression compound?
Why is immediate pouring of the impression recommended after using impression compound?
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Which statement is true regarding the need for tray adhesive when using impression compound?
Which statement is true regarding the need for tray adhesive when using impression compound?
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What characteristic of impression compound makes it unsuitable for severe bony undercuts?
What characteristic of impression compound makes it unsuitable for severe bony undercuts?
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Which of the following is a recommended practice when using alginate in impressions?
Which of the following is a recommended practice when using alginate in impressions?
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What positioning is recommended for a mandibular impression?
What positioning is recommended for a mandibular impression?
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Which term describes the resistance of a denture to removal in the opposite direction of insertion?
Which term describes the resistance of a denture to removal in the opposite direction of insertion?
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What is the primary characteristic of the mucostatic technique?
What is the primary characteristic of the mucostatic technique?
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In the mucodisplacive technique, what is the effect of applying more pressure to the tissues?
In the mucodisplacive technique, what is the effect of applying more pressure to the tissues?
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What happens to the primary support areas in the selective pressure technique?
What happens to the primary support areas in the selective pressure technique?
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What is the typical technique used for taking impressions of displaced tissue?
What is the typical technique used for taking impressions of displaced tissue?
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What characterizes the stability of a denture?
What characterizes the stability of a denture?
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What type of pressure is applied to the periphery in selective tissue displacement technique?
What type of pressure is applied to the periphery in selective tissue displacement technique?
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Study Notes
Complete Denture Construction
- Aim of prosthodontics is to restore and maintain teeth and adjacent structures.
- Complete denture construction involves primary and secondary impressions and mounting via articulator.
Clinical Examination
- Essential for collecting patient history and determining the appropriate prosthesis.
- Focus on dental and medical histories and examination of the prosthesis area.
Anatomy of Arches
- Maxillary and mandibular arches classified by:
- Stress-bearing (supporting) areas
- Peripheral (limiting) areas
- Relief areas
- Edentulous maxilla: 24 cm²; edentulous mandible: 14 cm².
- Mandible less capable than maxilla in handling occlusal forces.
Stress-Bearing Areas
- Primary stress-bearing areas usually have thicker mucosa and cortical bone.
- Buccal shelf is notable due to its horizontal orientation and composition of cortical bone.
Impression Techniques
- Stock trays used for primary impressions; pre-made and available in metal or plastic.
- Proper selection of stock tray is critical to avoid tissue distortion.
- Ideal tray dimensions: 3-5 mm larger than the residual ridge's outer surface.
Selecting Impression Materials
- Impression materials must be high viscosity for better compensation for tray deficiencies.
- Recommended materials include:
- Alginate: Good detail but dimensionally unstable due to moisture absorption.
- Silicone putty: High viscosity and some elasticity, compensates for underextensions.
- Impression compound: Non-elastic, can hold shape but may cause trauma to undercuts.
Importance of Accurate Impressions
- Accurate preliminary impressions are crucial for denture fit and stability.
- Overextension of borders is preferred over underextension to ensure a better fit.
- The weight of the stone must be supported to minimize distortion of impressions.
Retention, Support, Stability
- Retention: Resistance to dentures being removed in a direction opposite to insertion.
- Support: Resistance against displacement towards the tissues, primarily by bone and tissue.
- Stability: Resistance to movement in any direction except along the insertion path.
Tissue Displacement Techniques
- Mucostatic technique: Minimal pressure records the resting shape of tissues; optimal physical retention.
- Mucodisplacive technique: More pressure records displaced shape; even load distribution but reduced retention.
- Selective pressure technique: Different pressure on primary and secondary support areas to achieve a seal.
Managing Tissue Displacement
- Control achieved through material viscosity, spacers in the tray, and size/distribution of tray perforations.
- In maxillary impressions, mucostatic techniques are preferred; in mandibular cases, mucodisplacive techniques are often employed.
Cast Fabrication
- Primary casts created using plaster of Paris or dental stone, offering sufficient rigidity for special tray fabrication.
- Perfect casts result from perfect impressions, ensuring accurate anatomical replication.
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Description
This quiz explores the fundamental concepts of complete denture construction in prosthodontics. Topics include clinical examination techniques, anatomy of dental arches, stress-bearing areas, and impression methods. Test your understanding of these essential components for effective denture fabrication.
