BS EN ISO 12836:2015 pdf free.Dentistry一Digitizing devices for CAD/CAM systems for indirect dental restorations Test methods for assessing accuracy.
BS EN ISO 12836 specifies test methods for the assessment of the accuracy of digitizing devices for computer-aided design/computer-aided manufacturing (CAD/CAM) systems for indirect dental restorations. The methods described in this International Standard require a digitizing device in which the object is mounted relative to the optical or mechanical-contact system and therefore do not apply to hand-held scanning devices.
These test methods are not applicable to digitization by radiographic (X-ray) methods or by magnetic resonance imaging (MR I) methods.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications
ISO 1942, Dentistry — Vocabulary
ISO 3290-2, Rolling bearings — Balls — Part 2: Ceramic balls
ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated terms (VIM)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1942, ISO 5725-1, ISO Guide 99, and the following apply.
3.1 accuracy (measurement) closeness of agreement between a result ofa measurement and a true value of the measurand
Note I to entry: Accuracy is a qualitative concept. See 1 and 11.2 for quantification of its two constituent components: precision and trueness.[SOURCE: ISO 5725-1:1994, 3.6, modified]
3.2 calibration set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring instrument or measuring system or values represented by a material measure or a reference material and the corresponding values realized by standards.
3.3  digitizing device dental surface data acquisition device 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:
selective removal;
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.BS EN ISO 12836 pdf download.