compare the compressive strength of three types of dental gypsum products when they are mixed with or without vacuum
Cardiff Metropolitan University
MetadataShow full item record
Aim: This research aims to compare the compressive strength of three types of dental gypsum products when they are mixed with or without vacuum. Materials and Methods: Sixty cylindrical specimens were prepared with dimensions of 55mm length and 30mm diameter of gypsum products (Dental Plaster, Dental Stone and Die Stone). 30 samples, 10 of each product, were mixed without using a vacuum mixer and another 30 samples, 10 of each product, were mixed using a vacuum mixer. Each group was tested to evaluate its compressive strength. Results: Group 1 results demonstrate that Dental Plaster mixed using vacuum mixer has lower compressive strength than mixed without using vacuum mixer. The difference in average of percentage is 4.6%. Group 2 results demonstrate that Dental Stone mixed using a vacuum mixer has lower compressive strength than when mixed without using vacuum mixer. The difference in average of percentage is 10.9%. Group 3 results demonstrate that Die Stone mixed using vacuum mixer has higher compressive strength than when mixed without using vacuum mixer. The difference in average of percentage is 4.8%. Conclusions: According to the results, it is observed that the use of vacuum mixer results in average compressive strength of 1733.5 MPa for Die Stone. This is the highest value recorded across the three groups. Average compressive strength for Dental Plaster and Dental Stone is high when mixed without vacuum; the values are 519.52 MPa for Dental Plaster and 1367.71 MPa for Dental Stone. However, across the three groups, no significant difference in compressive strength is observed. Therefore, it can be concluded that there is no significant change in compressive strength when the three gypsum products are mixed with or without vacuum.
BSc (Hons) Dental Technology
Showing items related by title, author, subject and abstract.
Carolan, Gemma Mary (Cardiff Metropolitan University, 2017-06-01)Objectives: This study examined the effect of the addition of sodium chloride to dental plaster stone on compressive strength. This was in order to enable technicians to make an informed decision regarding the trade-off ...
Stathopoulou, Olympia (Cardiff Metropolitan University, 2017-06-01)This study examined the prospect of using three different mixing techniques using Plaster of Paris (Dental SP) and whether or not one would be revealed to have greater strength than the others. This project was carried ...
Boyle, Christopher (Cardiff Metropolitan University, 2014)Vascular occlusion has been repeatedly demonstrated to increase muscular strength and hypertrophy when combined with a low-intensity resistance programme. However, to date no investigations have explored the acute effects ...