Podcast
Questions and Answers
Surveying in prosthodontics involves analyzing a dental cast to determine the most favorable path of insertion and removal for a(n) ______.
RPD
A dental surveyor is used to mark the height of contour on abutment teeth and to identify areas needing ______.
adjustment
Tilting the cast helps in optimizing ______ for retention.
undercuts
Lowering the posterior region can increase distal ______ and decrease mesial ones.
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The initial positioning of the cast begins with a horizontal tilt, where the occlusal surfaces of teeth are parallel to the ______.
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To ensure consistency in future surveys, preserve the tilt through a process called ______.
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To achieve parallelism between guiding planes, an analyzing rod is used to evaluate the proximal surfaces of ______ teeth.
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Use a ______ to confirm the desired path of insertion and retention areas during the adjustment process.
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Once the optimal tilt is established, use a carbon ______ to delineate survey lines.
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The tilt should not exceed ______ degrees to maintain a practical path of insertion.
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Study Notes
Surveying in Prosthodontics
- Surveying is an important part of Removable Partial Denture (RPD) fabrication, analyzing dental casts to determine how best to insert and remove the prosthesis
- This process uses a dental surveyor to identify undercuts on teeth for retention, and areas needing modification
- Surveying helps plan the design and placement of clasps and other components
Path of Insertion
- A surveyor establishes a consistent path for inserting and removing the denture, crucial for retention and stability
- Surveying helps to identify undercuts on teeth that can be used for clasp retention
- Creates parallel surfaces on teeth which guide the prosthesis during insertion and removal
Surveying Tools
- Analyzing Rod: Used to assess undercuts and evaluate parallelism
- Carbon Marker: Marks survey lines on teeth to identify retention areas
- Undercut Gauge: Measures the depth and location of undercuts for clasp design
- Wax Trimmer: Used to trim excess wax and prevent overcontouring of the cast
Tilting the Cast
- Tilting the cast is essential during surveying to find the most advantageous path of insertion and optimize undercuts for retention
- Tilting the cast ensures the denture can be inserted and removed smoothly, increases desirable undercuts, minimizes undesirable ones and helps to conceal metal components
- There are three types of tilt: Anterior, Posterior and Lateral
Steps for Tilting the Cast
- Start by tilting the cast horizontally, where the occlusal surfaces of teeth parallel to the horizontal plane
- Analyze the proximal surfaces of abutment teeth to determine if any adjustments are needed to achieve parallelism between guiding planes
- Anterior Tilt: Tilting the cast forward increases mesial undercuts
- Posterior Tilt: Lowering the posterior region of the cast increases distal undercuts and decreases mesial ones
- Lateral Tilt: Adjust laterally to equalize undercuts on both sides of the arch, ensuring uniform retention across the arch.
- Identify hard or soft tissue interferences such as palatal tori or exostoses, as they may hinder the path of insertion
- Use the analyzing rod to confirm the desired path of insertion and retention areas are achieved with each tilt adjustment
- Mark survey lines using a carbon marker to delineate undercut areas
- Preserve the tilt using tripoding, which is a technique where three points are marked on the cast, allowing for precise repositioning in future surveys
Blockout in Surveying
- Parallel Blockout: Ensures guiding planes are parallel
- Shaped/Ledge Blockout: Creates ledges for clasp arms
- Arbitrary Blockout: Covers non-essential areas to prevent interference
Application of Surveying in RPD Design
- Clasp Design: Surveying informs the design and placement of clasps by identifying suitable undercut areas for retention
- Framework Design: Ensures all components of the RPD framework are properly aligned with oral structures
- Mouth Preparations: Guides necessary tooth modifications to create optimal guide planes and ensure proper fit
Tripoding
- Tripoding is a technique used to ensure that the cast can be repositioned in the same orientation on the surveyor after removal
- Three points are marked on the cast, typically in stable areas that are not susceptible to change or wear
- The marked points act as a reference for precise repositioning
Benefits of Surveying
- Enhances the precision of RPD design, providing a clear reference for component placement.
- Streamlines the design process by providing guidelines for framework construction.
- Allows for personalized prosthesis design tailored to individual anatomical variations.
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Description
This quiz covers the essential techniques and tools used in surveying for removable partial denture (RPD) fabrication. It emphasizes the importance of analyzing dental casts, determining the path of insertion, and utilizing various surveying tools to achieve optimal retention and stability. Test your knowledge on how surveying impacts the design and placement of prosthetic components.
