In Vitro Comparison of Coronal Micro-leakage of Three Temporary Restorative Materials by Dye Penetration

It is necessary to seal the dental access cavity which is under root canal treatment with temporary restorative materials. For this purpose, the main attention in selecting the temporary restorative material during endodontic treatments is drawn to the sealing ability. The purpose of this study is to investigate the coronal sealing ability of 3 temporary filling materials, Cavizol, Coltosol, and Zonalin through DPI (Dye Penetrant Inspection). In this study, 98 extracted with no decay mandibular and maxillary molar teeth were used. The teeth were divided into 3 experimental groups of 30 teeth and two positive and negative control groups of 4 teeth. In the experimental group, 4×4mm endodontic access cavity was created on the occlusal surface and in each experimental group the teeth were filled with Cavizol, Coltosol, and Zonalin. In the positive control group, access cavity was created but restorative material was not used. In the negative control group, access cavity was not created. Experimental groups (teeth) were placed in normal saline for 2 hours. Then, the first, second and third groups were immersed in methylene blue dye for 24 hours, 1 week, and 4 weeks, respectively. Zonalin showed significantly more (micro) leakage than Coltosol and Cavizol. Cavizol also showed more leakage than Coltosol, but there was no significant difference between them. According to the results of the study, Coltosol and Cavizol are suitable for dressings with less than one week duration because of better sealing. In case the interval between treatment sessions lasts more than a week, the dressing should be replaced.