Testing Laboratory for Dental Materials
The testing laboratory for dental materials of the General Teaching Hospital was established from the original technological laboratory of the Dental Research Institute, which was incorporated into the General University Hospital in Prague on the basis of a decision of the Ministry of Health of the Czech Republic in September 1999. The organizational measure of the General Teaching Hospital and the First Faculty of Medicine, Charles University, was renamed the Institute of Clinical and Experimental Dentistry from 1 January 2012, which became a further organizational change as of 1 September 2014 Department of Stomatology, General Teaching Hospital and First Faculty of Medicine.
Approximately two years of targeted preparation of the testing laboratory for accreditation Czech Accreditation Institute, ops was successfully completed in March 2000 by acquiring the first Accreditation Certificate. The necessary powers and responsibilities for compliance with all accreditation criteria have been delegated to its supervisor.
The scope of accredited testing activities is given by the appendix of the current accreditation certificate issued by ČIA based on the fulfillment of accreditation requirements according to the criterion standard ČSN EN ISO / IEC 17025 Conformity assessment - General requirements for the competence of testing and calibration laboratories. The testing laboratory management guarantees that all laboratory activities comply with the requirements of this standard, the legitimate requirements of customers, regulators and recognition organizations.
The accredited testing laboratory carries out physical-mechanical testing of dental materials, both on the basis of customer orders and as part of interlaboratory comparisons or other research projects. It is focused on testing of dental composite materials, glass ionomer cements, crown and bridge resin materials, amalgams, adhesive systems and dental impression materials. Testing procedures are mainly based on international ISO standards adopted in the Czech system of technical standards. The testing laboratory tests the depth of cure, water absorption, solubility and flexural strength of reconstructed polymeric materials, resin modified cements, materials for sealing wells and fissures, and crown and bridge resin materials as well as compressive strength of dental cements and amalgams. In dental amalgam, creep, plasticity and appearance after mixing are also evaluated. The most challenging test for test specimens is to determine the bond strength of adhesive systems to dental tissues (enamel or dentin), see Figure 4B. The properties of dental impression materials are also tested, especially their ability to reproduce details and compatibility with plaster.
In the framework of their working hours at the Dental Clinic of the General Teaching Hospital and the First Faculty of Medicine, Charles University, the employees of the testing laboratory participate in a number of other activities, such as medical-preventive care within the provision of health services, teaching students of the Department of Dentistry of the First Faculty of Medicine, clinical evaluation of medical devices , testing various dental materials and cosmetic products for oral hygiene by non-accredited procedures and research activities whose outputs are not subject to testing in the testing laboratory.