Glossary

H I P

The method of hot isostatic postcompaction is used today as a standard for improving characteristics relevant to fracture mechanics in ceramic implants. HIPing reduces porosity, increases density and purity, and thus leads to a relevant increase in long-term life expectancy and a decrease in the tendency to sub-critical crack growth. (Wolfhart Rieger, Stefan Köbel, Wolfram …

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Healing by first intention

Syn.: Healing by primary intention, primary closure. Healing of a wound in which the edges are closely re-approximated. Union or restoration of continuity occurs directly with minimal granulation tissue and scar formation.

Heart Valve

Mechanical heart valves and tissue heart valves are used as implants. anatomy The heart has two chambers, each having two valves. The two atrioventricular valves (AV) are called mitral valve (bicuspid valve) and tricuspid valve. The two semilunar valves are called aortic valve and pulmonary valve. types There are two basic types of valves: Mechanical …

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Hematoma

A mass of blood (usually clotted) confined to a space and caused by a break in a blood vessel.

Hemostasis

Thrombocytes stop bleeding. They aggregate at the contact with collagen and the proteins from the implant surface and close the ruptured vessels. Thrombocytes release messengers, to support crosslinking (thromboxan), to fibroblast building with PDGF(platelet derived growth factor). Fibrin monomers crosslink. Adsorption of an implant materials iones and blood proteines (albumines, fibrinogen, fibronektin).

hernia

A hernia is the abnormal exit of tissue or an organ, such as the bowel, through the wall of the cavity in which it normally resides. Hernias come in some types. Most commonly they involve the abdomen, specifically the groin.

heterologous

xenogenous Tissue grafts, when donor and recipient belong to different species. A heterologous transplant means ‘between species’ or ‘from one species to another’.

Histomorphometry

The quantitative study of the microscopic organization and structure of a tissue (e. g. bone), especially by computer-assisted analysis of images acquired from a microscope.

Hollow basket implant

A dental root-form implant with an internal channel penetrating the implant body from/at its apical aspect.

Host response

The local or systemic response of the host organism to an implanted material or device.

Hounsfield Unit

HU A unit of y-ray attenuation used for CT-scans as a measurement of bone density. Each pixel is assigned a value on a scale on which air is -1000, water 0, and compact bone +1000. In dentistry exists a proposal to use bone density as a determinant for clinical success (Misch CE, Contemporary Implant Dentistry, …

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How to choose a surgeon

Choosing a Surgeon you should ask the following questions. 1. How many implantation procedures of the planned kind does he/she perform per year? 2. How many years has he/she performed implantation procedures? 3. Is he/she board certified for that surgical procedure, and if so, with which board? 4. What is the most common complication he/she …

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hpsc

Human pluripotent stem cells

HU

see: Hounsfield Units

Hybrid implant

Dental An endosseous, root-form implant, with different surface textures at different levels.

Hydroxyapatite

also Hydroxylapatite, HA, CaHA, Apatite CaOH   physical Naturally occurring mineral form of calcium apatite. Pure hydroxylapatite (HA) powder is white. Naturally occurring apatites can, however, also have brown, yellow, or green colorations. chemical Ca5(PO4)3(OH) occurrence Carbonated calcium-deficient HA is the main mineral of which dental enamel and dentin are composed. HA crystals are also found …

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Hygiene cap

Dental Component inserted over a prosthetic abutment. Its function is to prevent debris and calculus from invading the internal portion of the abutment between prosthetic appointments.

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