BS EN ISO 12836:2015 pdf free

BS EN ISO 12836:2015 pdf free.Dentistry一Digitizing devices for CAD/CAM systems for indirect dental restorations一Test methods for assessing accuracy
device for computer-aided design and manufacturing of custom-made indirect dental restorations used to record the topographical characteristics of teeth and surrounding tissues, implant connecting components, dental impressions, dental moulds, or stone models by analogue or digital methods
Note 1 to entry: These systems consist of a scanning device, hardware and software.
Note 2 to entry: A surface digitization procedure starts with the generation of actually measured surface points (or their conversion, for example, in STL format), which are the measured digitization data. In most digitizing systems, the measured points are mathematically processed by operations such as:
一matching;
一filtering;
一weighing;
一selective removal;
一smoothing, etc.
This results in the processed digitization data (or surface data). These data depend very much on, for example, the digitization protocol (for example, the number of passes), the extraction method of a surface from the raw data points, and the matching of point clouds.
any kind of restoration manufactured extraorally which replaces intra-oral hard and/or soft tissues
EXAMPLE Crowns, bridges, inlays, implant superstructures, prostheses, provisional restorations.
Note 1 to entry: Epitheses that involve the oral cavity are included; devices for short-term use, for example,surgical guides, are excluded.
set of operations which are specifically used in the performance of particular measurements according to a given technique
Note 1 to entry: In a quality system, a measurement procedure is recorded as a working instructions document and should be described in sufficient detail to enable an operator to carry out a measurement without additional information.
closeness of agreement between independent results of measurement obtained under stipulated conditions
Note 1 to entry: Precision is a qualitative concept. The operational definition that applies in this International Standard is the standard deviation described in 5.3.2.
result of a measurement minus the mean that would result from an infinite number of measurements of the same measurand carried out under repeatable conditions
Note 1 to entry: Random error is equal to trueness minus systematic error.
Note 2 to entry: In practice, random error may be estimated from 20 or more repeated measurements of a measurand under specified conditions.BS EN ISO 12836 pdf free download.