Protocol for the recycling of plaster waste generated in the manufacturing processes of dental prostheses in a University Institution of Medellín

Abstract

Introduction: The plaster used in the manufacture of dental prostheses is almost pure hydrated calcium sulfate CaSO4 (2H2O), because it is essential to obtain study and laboratory models, and also represents 55% of the waste generated. In dental laboratories, it is discarded without identifying and classifying it; to date, there are no protocols for its final disposal that allow its use and potential of the recycled material. Objective: Carry out a protocol for the recycling of plaster residues generated in the processes of manufacturing dental prostheses. Methodology: An experimental research with a quantitative approach was carried out. The stages of the recycling process were: collection, quantification of type II, III, IV plaster residues, cleaning, crushing, pre-drying, sifting, weighing, packaging and labeling of the recycled material. In addition, cylindrical specimens of 20 mm in diameter and 40 mm in height were made, which served to subject the material to mechanical tests. Results: After establishing a protocol for the adequacy of plaster residues, the material was subjected to mechanical tests and according to the mechanical tests of the Colombian Technical Standard NTC 562 of dental materials - dental plaster, the recycled material has good mechanical properties. Conclusions: A protocol for the adequacy of recycled plaster and a protocol for laboratory procedures in which recycled material can be used were established, thus contributing to sustainable development and environmental quality in the manufacturing processes of dental prostheses.