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Questions and Answers
What is the purpose of survey lines in dental casts?
What is the purpose of survey lines in dental casts?
Undercuts are located apical to survey lines.
Undercuts are located apical to survey lines.
True
What should be marked on the surface of the cast to indicate areas for retentive clasps?
What should be marked on the surface of the cast to indicate areas for retentive clasps?
Mechanical undercuts
The __________ is raised in the surveying process to determine the critical arm contact point.
The __________ is raised in the surveying process to determine the critical arm contact point.
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Match the following parts of the dental surveying process with their functions:
Match the following parts of the dental surveying process with their functions:
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Which tissue areas commonly need to be transferred to a removable partial denture?
Which tissue areas commonly need to be transferred to a removable partial denture?
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The contact point made by the undercut gauge should not appear as a mark on the cast.
The contact point made by the undercut gauge should not appear as a mark on the cast.
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What color should the point of contact be marked with on the cast?
What color should the point of contact be marked with on the cast?
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Study Notes
Surveying Techniques in Dentistry
- Survey lines are transferred to the cast from contacts made between the dental cast and a carbon marker, indicating prominent contours of individual teeth at a specific orientation.
- Areas located occlusal or incisal to survey lines typically do not display undercuts, while those apical to the lines are considered undercut in relation to the chosen path of insertion.
Importance of Survey Lines
- Clinicians must ensure survey lines and tissue areas that may contact removable partial denture components, such as clasps, are accurately transferred.
- Soft tissue areas likely to be affected by clasp engagement should be marked for consideration in denture design.
Locating and Marking Undercuts
- Mechanical undercuts must be precisely identified and marked for proper placement of retentive clasps, ensuring secure denture fit.
- An undercut gauge is utilized to assess and mark areas needing engagement without contacting the surface of the cast initially.
Procedure for Marking Contacts
- The critical arm of the surveyor is raised to gauge the exact apical border contact area, marking it with a red pencil.
- The point of contact is characterized as a light scrape on the cast's surface, appearing as a thin horizontal line approximately 2 mm in length.
Clinical Application
- These techniques are integral for designing removable partial dentures, ensuring both functional and aesthetic outcomes for patients.
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