Dental Hand Instruments


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Hand instruments used in Dentistry, a general overview of classification of different types and uses of the instruments.
More detailed description about some of the commonly used cutting instruments is provided.

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Dental Hand Instruments

  1. 1. Dental Instruments Presented by : Samar A. Fadel.
  2. 2. Dental Insturments What are they? Definition:Hand instruments are those instruments that are used manually without a power source .
  3. 3. Hand Instrument Design: Handle  Portion of the instrument where the operator grasps. Shank  Part of the instrument that attaches the working end to the handle. Working end  Portion of the instrument with a specific function.
  4. 4. Identifying Hand Instruments: Referred to by:  Name  Assigned number Black’s instrument formula  Describes the angulations.  Describes the dimensions.
  5. 5. History:The early hand-operated instruments characterized by:Large, heavy handles and inferior metal alloys in the blades.They were difficult to use, ineffective in many situations because there was no uniformity of manufacture or nomenclature.Many dentists made their own hand instruments for different needs.
  6. 6. The experience was something like this:
  7. 7. ClassificationG.V Black is credited with the first acceptable nomenclature and classification of hand instruments.His classification system enabled both dentists and manufacturers to communicate more clearly and effectively in regard to instrument design and function.
  8. 8. Dr. G. V. Black classified instruments according to :ORDER names: Denote the purpose for which the instrument is to be used.Such as Mallet or clamps.SUBORDER names: Define the manner or position of use of the instrument, such ashand mallet or molar clamps.CLASS names: Describes the working point of the instrument , such as spoonexcavator or inverted cone bur.SUBCLASS names: Indicates the angle of the shank, such as bin-angel.
  9. 9. What do you think these numbers mean?! 15-95-8-12RDr. Black also evolved the instrument formula by whichinstruments could be readily duplicated anywhere.-The number of a gingival margin trimmer is given as 15-95-8-12R: The first two digits (15) designate the width of the blade intenths of millimeter, the third and fourth(95) its length inmillimeters.-The fifth digit(8) represents the angle which the blade forms withaxis of the handle expressed in hundredths of a circle(100gradations or centigrades).-The sixth and seventh digits represent the angle made by thecutting edge with the axis of the hand( in instruments in which thecutting edge is at angle to the length of the blade).-The handle letter (R or L) signifies that the instrument is one of apair made in “rights” and “lefts” in order to work more efficiently.
  10. 10. Hand Instrume nts Cutting Non- cutting Instrume Instrumen nts ts Explorers AmalgamExcavato Perio. Mirrors condenser Others rs Chisels Others s probs Gingival Bin- Enamel Straight Curved margin Spoon Angled Hatchet Ordinary Angle trimmers Hoes excavato Knives Hatches formers rs scalers carvers
  11. 11.  Hatchets: -the blade and cutting edge are on a plane with the long axis of the handle, the shank has two angles -Used for cutting enamel, and to smooth the walls and floors of the tooth preparation. -used in Class II preparations, especially for finishing the enamel margins and removing unsupported enamel.
  12. 12.  Gingival margin trimmer:  Used to cut enamel and place bevels along the gingival enamel margins of the preparation. used for rounding or beveling of the axiopulpal line angle of two-surface preparations.
  13. 13.  Hoe:  Used to plane the walls and floors of the tooth preparation.  Similar than chisel but the blade is angled more than 12.5 centigrades - Used to remove unsupported enamel
  14. 14.  Chisel:  Used to cut the enamel margin of the tooth preparation, form sharp lines, point angles, and place retention grooves.  Straight chisel  Bin-angle chisel  Wedelstaedt chisel  Angle former
  15. 15. Please don’t be thise kind of Dentists :P
  16. 16. Guys, never forget this
  17. 17. Thank you ….