Effect of working time on the film thickness of dental resin cements.
10.4047/jkap.2015.53.4.325
- Author:
Yu Seung YI
1
;
Sung Hun KIM
;
Jai Bong LEE
;
Jung Suk HAN
;
In Sung YEO
;
Seung Ryong HA
;
Hee Kyung KIM
Author Information
1. School of Dentistry, Seoul National University, Seoul, Republic of Korea.
- Publication Type:Original Article
- Keywords:
Resin cements;
Film thickness;
Working time
- MeSH:
Linear Models;
Resin Cements;
Resins, Synthetic*
- From:The Journal of Korean Academy of Prosthodontics
2015;53(4):325-329
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: The aim of this study was to compare the film thicknesses of several resin cements as a function of time after mixing and to examine the effect of working time on the film thicknesses. MATERIALS AND METHODS: The film thickness (microm) of 4 resin cements (n=10), 1 composite resin (Panavia F 2.0), 3 self-adhesive resin (Clearfil SA luting, Zirconite, RelyX U200) cements was measured at 20-second intervals after mixing of the cements up to 200 seconds under a load of 50 N. Linear regression was fitted to verify the effect of working time on the film thickness of each cement. Data were compared to the working time recommended by manufacturers using Wilcoxon test (alpha=.05). RESULTS: All of the materials showed a positive linear correlation between the film thickness and working time. There was no statistically significant difference between the working time based on our results and the values recommended by the manufacturers even though there was a discrepancy between those two values. CONCLUSION: The film thickness of resin cements could increase with the increase of working time. Working time to meet the ISO standard of 50-microm maximum film thickness could be different from the manufacturer's recommended value.
