Chapter 3 Surveying SLOs

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Questions and Answers

What is the purpose of a dental surveyor?

To evaluate the esthetic appearance of teeth

To determine the relative parallelism of tooth surfaces (correct)

To identify the path of insertion and removal of a dental prosthesis

To measure the height of contour of teeth

What does the survey line on a tooth represent?

The gingival margin of the tooth

The maximum convexity or height of contour of the tooth (correct)

The occlusal plane of the tooth

The path of insertion for a dental prosthesis

Which area of the tooth is considered an undercut area?

The area gingival to the survey line (correct)

The area at the height of contour

The area occlusal to the survey line

The area on the lingual surface of the tooth

How does changing the tooth position in relation to the vertical plane affect the survey line and undercut area?

It changes the location of the survey line and the location and amount of undercut area Signup and view all the answers

Which of the following is NOT a part of a dental surveyor?

Articulator Signup and view all the answers

What is the primary function of a dental surveyor?

To determine the relative parallelism of tooth surfaces Signup and view all the answers

What is the purpose of the reinforcing sheath mentioned in the text?

To maintain the carbon marker from breakage Signup and view all the answers

What are the three sizes of the undercut gauges described in the text?

0.010, 0.020, 0.030 inches Signup and view all the answers

What is the purpose of the wax knife or wax trimmer mentioned in the text?

To remove the excess wax which blocks out undesirable undercuts Signup and view all the answers

What is the purpose of the analyzing rod mentioned in the text?

To survey the diagnostic and master casts Signup and view all the answers

What is the purpose of the surveyor mentioned in the text?

To help with proper diagnosis, designing and treatment planning Signup and view all the answers

What is the primary reason for changing the path of insertion of a denture?

To improve the fit of the denture flange on the ridge Signup and view all the answers

When is a rotational path of insertion used for a denture?

When the undercuts are not sufficient at a zero-tilt path of insertion Signup and view all the answers

How can the tilt of the cast be changed to create suitable undercuts for a denture?

By increasing the tilt of the cast to create more undercuts Signup and view all the answers

What is the preferred path of insertion for a denture?

A path of insertion perpendicular to the occlusal plane (zero tilt) Signup and view all the answers

When should the path of insertion be changed to place the clasp on a stronger abutment tooth?

When the molar is weaker than the bicuspid Signup and view all the answers

What is the purpose of analyzing the proximal surfaces of the abutment teeth when determining the path of insertion?

To identify suitable undercuts for the denture Signup and view all the answers

What is the purpose of tripoding the cast?

To establish three points on the same horizontal plane for repositioning the cast Signup and view all the answers

What is the purpose of blocking undercuts on the cast?

To prevent the denture from being locked on the cast during removal Signup and view all the answers

What is the next step after tripoding the cast?

Making a duplicate cast for denture manufacturing Signup and view all the answers

Which of the following is NOT a function of the surveyor?

Positioning the denture teeth on the cast Signup and view all the answers

Where are the tripoding marks typically placed on the cast?

Lingual to the remaining teeth on the tissue side of the cast Signup and view all the answers

What is the primary purpose of guide planes on abutment teeth?

To limit the path of insertion and improve stability Signup and view all the answers

In the absence of guide planes, what situation allows for multiple paths of insertion?

When the abutment teeth are divergent Signup and view all the answers

What is the recommended vertical extent for a prepared guide surface on an abutment tooth?

3 mm Signup and view all the answers

What is the maximum recommended thickness of enamel removal for preparing a guide surface?

0.5 mm Signup and view all the answers

Where should a prepared guide surface be located on an abutment tooth?

Far from the gingival margin Signup and view all the answers

What is a necessary condition for the path of removal of a partial denture?

The presence of retentive undercuts at the horizontal tilt Signup and view all the answers

Study Notes

Dental Surveyor

A dental surveyor is an instrument used to determine the relative parallelism of surfaces of teeth or other areas on the cast of the jaws.
It determines the survey line of the teeth and measures tooth undercuts.

Survey Line and Undercut Areas

The survey line is an imaginary line indicating the maximum convexity or the height of contour of the tooth.
The area of the tooth gingival to this line is an undercut area.
The area occlusal to this line is a non-undercut area.

Factors Determining Path of Insertion

Guiding planes: formed by two or more parallel axial surfaces on abutment teeth, limiting the path of insertion and improving stability.
Retentive undercuts: present on abutment teeth at the horizontal tilt.
Esthetics: minimizing visibility of metal components.
Health of the abutment teeth: selecting the path of insertion to prioritize stronger teeth.

Path of Removal

The reverse of the path of insertion, referring to the direction of movement of the partial denture from fully seated position to the last contact with the teeth.

Procedures of Surveying

Analyzing the proximal surfaces of abutment teeth using an analyzing rod.
Determining the path of insertion using a surveyor.
Tripoding the cast to record the final tilt and reposition the cast for manufacturing.

Surveyor Tools and Their Functions

Analyzing rod: analyzes proximal surfaces of abutment teeth.
Carbon marker: marks the survey line on the cast.
Undercut gauge: locates and measures horizontal undercuts on the tooth surface.
Wax knife or wax trimmer: removes excess wax and blocks out undesirable undercuts.
Reinforcing sheath: maintains the carbon marker from breakage.

Uses of Surveyor

Surveying diagnostic and master casts for proper diagnosis, designing, and treatment planning.
Blocking undesirable undercuts on the cast.

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Description

Learn about dental surveyors, their parts, tools, uses, path of insertion and removal, factors determining the path of insertion, and procedures of surveying in this chapter. Understand the importance and techniques involved in surveying natural teeth surfaces.