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  • dental key

    Used in dentistry to remove diseased teeth. The dental key’s ‘claw’ would be tightened over a tooth. The instrument was then rotated to loosen the tooth. This often resulted in the tooth breaking, causing jaw fractures and soft tissue damage. It has been replaced by modern forceps.

  • dental pelican

    Used for extracting teeth sideways. Invented by Guy de Chauliac in the 1300s. It was used for tooth extraction before the use of dental keys.

  • dentistry

    The study, treatment and management of diseases affecting the mouth, jaws, gums, teeth and their supporting tissues.

  • dentist's chair

    Dentist's chairs are deeply reclining chairs to allow the dentist easy access to the patient's mouth. The reclining position adjusts as well as the overall height of the chair. Associated with the chair are usually a variety of dental equipment, often including a small tap and sink for the patient to rinse his or her mouth.

  • denture

    A replacement tooth, or set of teeth that are usually removable.

  • denture articulator

    a hinged frame that simulates jaw movements (source, upper wellcome label)

  • departure board

    A notice at a railway station showing the destination and departure times of trains.

  • depilatory tweezers

    tweezers used for the plucking of body hair

  • deposit book

    Receipts from a bank certifying that a specified sum of money has been received for deposit, often for a specified length of time and at specified rates of interest.

  • depression

    A mental state associated with acute sadness. Activity can be decreased, especially interaction with others, and sleep, appetite, and concentration can also be disturbed.

  • depth gauge

    Instrument consisting of a rule that slides through a crosspiece and is inserted to measure the depth of holes, grooves, or other similar small depressions.

  • dermatome

    an instrument for cutting thin skin slices for grafting

  • dessert fork

    Forks smaller than a dinner fork intended primarily for eating desserts; generally having a short handle and three or four, but sometimes two, tines. May be accompanied by a dessert spoon; sometimes a part of a dessert service.

  • dessert knife

    Knives smaller than a dinner knife intended for eating desserts; generally having a shorter handle and may have a curved and pointed blade; sometimes a part of a dessert service.

  • dessert spoon

    Spoons intended for eating desserts, intermediate in size between a teaspoon and a tablespoon. May be accompanied by a dessert fork; sometimes a part of a dessert service.

  • detective camera

    Compact cameras made to resemble a variety of objects like books or opera glasses or made to be concealed in clothing; used for taking pictures unnoticed and often from unexpected angles.

  • detonator tin

    A metal cylindrical container for the storage of detonators.

  • dewar flask

    a double-walled flask of metal or silvered glass with a vacuum between the walls, used to hold liquids at well below ambient temperature, named after Sir James Dewar (1842–1923), Scottish chemist and physicist.

  • diabetes

    This term refers to any form of metabolic disorder characterized by extreme thirst and excess urine production.

  • diagnostic figure

    A carved figure used by women to indicate their symptoms in an age when it was considered improper for a male doctor to examine female patients.

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