types of dental surveyor
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There are several types of surveyors used in dentistry. The main types include the Ney surveyor, Jelenko surveyor, Williams surveyor, retentoscope, stress-o-graph, Ticonium, broken arm cast surveyor, electrical/computerized surveyors, optical surveyor, intra-oral surveyors, and parallelometers. Each type has slightly different features but they all serve to locate and delineate the contours and positions of teeth and structures for designing removable partial dentures. The Ney surveyor was the first commercially available type while newer computerized and electrical versions provide advanced digital capabilities.
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types of dental surveyor
- 2. TYPES OF SURVEYORS: By: Nimrah Razzaque Memon DCP Batch V sem. VIII
- 4. SURVEYING: The procedure of locating or delineating the contour and position of the abutment teeth and associated structures before designing a removable partial denture. GPT-1 SURVEYOR: An instrument used in the construction of a removable partial denture to locate and delineate the contours and relative positions of abutment teeth and associated structures- GPT
- 5. TYPES OF SURVEYOR: •NEY SURVEYOR •JELENKO SURVEYOR •WILLIAMS SURVEYOR •RETENTOSCOPE •STRESS-O-GRAPH •TICONIUM •BROKEN ARM CAST SURVEYOR •ELECTRICAL/ COMPUTERIZED •OPTICAL SURVEYOR •INTRA ORAL SURVEYOR •PARALLELOMETER
- 6. NEY SURVEYOR: •First model developed by Ney in 1923 •Original Ney surveyor featured a convenient palm rest on the top of the vertical arm. •First surveyor to be commercially available. •Ney designed in 1938 is the currently used surveyor.
- 7. JELENKO SURVEYOR: •It is also known as Will’s surveyor. •It was introduced in 1929 •It is used with different designs of cast holders.
- 8. ï‚ž Ney ï‚ž Horizontal arm: fixed ï‚ž Vertical arm: retained by friction ï‚ž The shaft remains in any vertical position until again it is moved. ï‚ž Cast table is moved around surveyor platform. ï‚ž Jelenko ï‚ž Horizontal arm:Movable ï‚ž Vertical arm: spring mounted ï‚ž Vertical arm when released return to its original position. ï‚ž Cast table is fixed with the magnet in the surveyor platform
- 9. WILLIAM SURVEYOR: •Table is adjusted to desired tilt. •Degree of inclination can be recorded for positioning the cast at any time. •Centre of rotation always remains constant.
- 10. RETENTOSCOPE: •It is produced by the saddle lock company. •It is a surveyor with undercut gauge. •The cast attached on the table can be raised and lowered vertically and eliminates the need for movement in vertical rod.
- 11. TICONIUM: STRESS O GRAPH: •One of the modern instrument •The marking point will make vertical line on the abutment tooth until depth has been reached. •Also produced by Ticonium company. •Consists of two vertical holders/ horizontal arms. •One for measuring undercut. •Second for measuring survey line.
- 12. BROKEN-ARM CAST SURVEYOR: •Featuring the Gimbel stage table. •Can be adjusted in any tilt/ direction. •Spring loaded surveying arm. •Straight hand piece could easily be clamped with surveying arm.
- 13. ELECTRONIC/COMPUTERIZED SURVEYORS: •Surveyor with milling machine: built in motor and cross table •Micro analyzer: capable of measuring undercut electronically in mm. •Paratherm surveyor: blockout waxing instrument heats waxing tools electrically, surveying arm moves in 3 axis. •Austenal surveyor: modern electical surveyor.
- 14. OPTICAL SURVEYOR: •parallel light beams. •Light bulbs with dense filaments & condenser lenses. •Contained in a box. Advantages: •Changes in survey lines & undercut can be inspected easily. •Better visualization. Disadvantages: •Requires dark room •Light beams reflecting from cast can pose problems in illumination.
- 15. INTRA-ORAL SURVEYORS: •For checking tooth preparation of abutment teeth for fixed/removable partial dentures. •Accurately indicates planned path of insertion •Visual guide during tooth preparation •Inexpensive, practical & readily available method.
- 16. PARALLELOMETERS: •Used before surveyors. •Can be used intra orally as well as in labs. •Partially block undercuts. •Advanced parallelometer: Galloni isoparallelometer model 1020 •2000 Bechmann parallelometer: for the placement of precision attachment parallel to path of insertion.