Sandblasters in dental technology
Frameworks are processed in the abrasive technique using appropriate sandblasters.
Handpieces are used in microblasters for manual blasting of individual frameworks. Recycling sandblasters are also available with integrated (adjustable) nozzles, which can also be used for simultaneously sandblasting several similar frameworks (e.g. CoCr castings) automatically in a slowly rotating blasting basket. Combination sandblasters incorporate the two functions.
Sandblasters are equipped with reservoirs (abrasive tanks) for one or more different abrasives (different grit sizes). Modern units often have a modular design and can simply be extended with other abrasive tanks as required for additional applications. Color-coding is used to facilitate identification and assignment of abrasives, handpieces/nozzles and system controls.
The abrasive is directed onto the surface to be sandblasted using compressed air (preferably filtered, free from oil and water) as a jet through a fine nozzle, made from a highly resistant material (e.g. boron carbide). Accurate focusing of the jet increases the sandblasting precision and at the same time reduces the material consumption. The blasting chamber forms a self-contained work area. Used abrasive is trapped by filter systems and extractors, preventing indoor air contamination. Separators remove contaminants from the abrasive.
Viewing glass (the service-life is increased by using optional mesh guards), lighting and additional magnifying systems ensure a good view. Gloves (cuffs), which are permanently fixed in the unit housing, enable manipulation of the frameworks. Sandblasting is often activated using a foot-switch in order to keep the hands free.
Precise coordination of sandblasting pressure, grit size of the abrasive and distance and angle of the nozzle to the framework to be sandblasted are crucial in ensuring optimum sandblasting in the least possible and therefore more cost-effective time.
Modern sandblasters are suitable for universal use in all areas of application, e.g. the removal of residual investment and metal oxides, roughening to create retentive surfaces, high-luster or matt sandblasting, compacting metal surfaces as well as special applications such as cold silanization for coating surfaces in the RocatecTM system.
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Root canal posts are inserted centrally into adequately long, straight sections of devitalised, root-filled teeth which show no pathological findings either clinically or radiologically. Severe vertical and horizontal structure loss from the clinical crown is an indication for… Root canal posts are inserted centrally into adequately long, straight sections of devitalised, root-filled teeth which show no pathological findings either clinically or radiologically. Severe vertical and horizontal structure loss from the clinical crown is an indication for root canal posts. The preferred method is generally to insert the root canal post, so that it (by predrilling with ascending diameters) virtually fills the prepared post site and fits close to the dentine wall. That section of the root canal post in the root should be at least as long as the crown restoration, leaving a few millimetres of the root canal filling to seal the apex. Isolated concepts have also been developed with smooth metal posts projecting apically beyond the tooth and intended for anchoring in the bone (transdental fixation).
Tooth 14 conical and smooth, tooth 13 cylindrical and threaded Customised root canal posts (often made from precious metal alloys), cast after waxing up directly in the root canal or indirectly after taking an impression of the root canal lumen (using burnout posts), can also be used for filling lumina with oval or irregular cross sections, as well as two or three divergent canals each fitted with a post inserted, if necessary, through the opening of another canal. The core build-up(s), or even the entire crown (historically: post crown) can be integrated. |