Surveying Path of Insertion Guide Plane

The act of using a surveyor is referred to as (a)   The process of analyzing the study cast for the purpose of establishing the structural details of the RPD  Blueprint of partial denture design

Is a diagnostic instrument used to select the most favorable path of insertion and aid in the preparation of guiding planes

Also known as parallelometer, one of the cornerstones of effective partial denture design and construction

First introduced to the dental profession in 1918

(a)  

Horizontal arm: Fixed

Vertical arm: Retained by friction

The shaft remains in any vertical position until again it is moved.

Cast table is moved around surveyor platform.

• Ney

• Jelenko

Horizontal arm: Movable

Vertical arm: Spring mounted

Vertical arm when released return to its original position.

Cast table is fixed with the magnet in the surveyor platform

• Ney

• Jelenko

TYPES OF DENTAL SURVEYOR

Are complicated and expensive and their use is restricted to research and large commercial dental laboratories.

• Electronic surveyors

• Mechanical surveyors

TYPES OF DENTAL SURVEYOR

Are relatively inexpensive and easy to use. Every dentist learns to use a surveyor as a student in dental school and should continue to use one in practice if he or she is constructing RPD / FPD

• Electronic surveyors

• Mechanical surveyors

USES of DENTAL SURVEYOR :

Give atleast 3 Uses of Dental Surveyor

Select if Yes when you are done

 Locating soft tissue undercuts, which can influence the extent of the denture base, the type of direct retainers and the path of insertion selected

 Contouring wax patterns for fixed restorations that will be partial denture abutments

 Machining parallel surfaces on cast restorations

 Blocking out undesirable undercuts on master casts

 Placing Intracoronal retainers (precision attachments)

 Recording the cast position in relation to the selected path of insertion (tripoding)

 Determine most acceptable path of insertion and removal

• Yes

• No

BASIC PARTS OF DENTAL SURVEYOR

Parallel to the bench top and on which the cast holder is moved.

• Level platform

• Vertical column

• Horizontal arm

• Mandrel

BASIC PARTS OF DENTAL SURVEYOR

Supports the suprastructure

• Level platform

• Vertical column

• Horizontal arm

• Mandrel

BASIC PARTS OF DENTAL SURVEYOR

That extends at a right angle from the vertical column. Surveying arm

That extends vertically from the horizontal arm

Capable of movement in a vertical direction and contains a mandrel at its lower end

• Level platform

• Vertical column

• Horizontal arm

• Mandrel