Mindblown: a blog about philosophy.
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Hazard ratio
The risk of an event occurring in one group compared with another when the primary response variable is the time to event. A hazard ratio of 1 indicates that neither group is more at risk for the event than the other. If the hazard ratio is, for example, 5, then one group is five times…
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Hawley appliance
A removable orthodontic palatal retainer made of acrylic and wire often modified to allow for minor tooth movement or tooth position stabilization.
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Haversian canal
Freely anastomosing channels within cortical (dense) bone containing blood and lymph vessels, and surrounded by concentric bone lamellae. A minute vascular canal located in osseous tissue. Named for Havers, an English anatomist of the late seventeenth century. A fine canal which runs vertically through the Haversian systems in compact bone, containing blood vessels and lymph…
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Harvest
Procurement of a graft from a donor site. To take something for use elsewhere, e.g. a piece of skin for a graft or eggs for IVF. To obtain samples or remove bacteria or other microorganisms from a culture.
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Hard palate
Bony partition separating the oral and nasal cavities. The front part of the roof of the mouth between the upper teeth. Bony portion of the roof of the mouth, bounded on the front and sides by the gums and, in the back, continuous with the soft palate. The anterior bony portion of the roof of…
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Haptic technology (haptics)
A tactile feedback technology that takes advantage of the sense of touch by applying forces, vibrations, or motions to the user. Refers to touch sensation and information transmitted through body movement and/or position.
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Hapten
A relatively small, lipophilic, nonprotein molecule that is able to elicit an immune response (contact or delayed hypersensitivity) only when bound to a carrier protein. Any chemical, drug, or its metabolite that combines with tissue protein to form a complete antigen; most allergenic drugs are haptens. A small molecule that can elicit an immune response…
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Hand prosthesis
Artificial substitute for a human hand.
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Handpiece motion tracker
An array of active emitters or passive reflectors that are attached to a surgical instrument to enable their localization within the operative field by an overhead detector.
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Hanau Quint
Five factors involved in developing a balanced articulation for removable complete dentures: incisal guidance, condylar guidance, cusp height, plane of occlusion, and compensating curve. First described by Rudolph Hanau in 1926 and incorporated in the design of a semi‐adjustable articulator (Hanau H) that provided for horizontal condylar guidance to be set using an intraoral protrusive…
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