Evaluation of surface roughness and bacterial involvement after finishing in temporary crown materials

It is important to use a temporary restoration until the treatment is finished in order to protect the prepared teeth and ensure the patient's comfort during the construction of fixed restorations. Today, polymethyl methacrylate, polyethyl methacrylate, urethane dimethacrylate and bis-Acryl resins are used as permanent temporary restoration materials. Polymerization in these materials can be activated chemically, by light or by both chemical and light. In recent years, temporary restorations have also been produced by forming pre-polymerized resin blocks industrially with Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) technique. The aim of this study is the ideal finishing process of temporary crown materials; it is to prepare restorations in the most ideal way by detecting surface roughness and bacterial involvement parameters. It is planned to prepare 144 samples from 6 different temporary crown materials that will be used in the study. Samples from each group of transient materials were divided into two subgroups. 12 examples of polishing were planned as 12 sample control groups. A sample from each group was also prepared for SEM analysis. After finishing the samples, surface roughness values were measured using an optical profilometer. Surface roughness values were measured and compared After applied surface treatments. SEM analysis was performed for Surface Imaging on one sample from each group. A bacterial involvement test was performed to determine whether there was bacterial involvement on the surfaces of the samples. As a result of our study, it was observed that there was less bacterial involvement in the polishing samples. The most bacterial involvement was observed in the polyethylmethacrylate control and bis acrylic Composite control group. In addition, intra-group surface roughness was increased after polishing in all groups except polymethylmethacrylate. Key Words: bacterial involvement, polishing , surface roughness, temporary crown