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Effect of three types of mouth rinses and human saliva on microhardness of packable and nanocomposite resins (In vitro study) | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 23, Issue 0, 2011, Pages 25-29 | ||
| Authors | ||
| Nagham A. Al-Hyali; Haitham J. AL-Azzawi | ||
| Abstract | ||
| Background: The purpose of this an in vitro study was to evaluate and compare the influence of three types of mouth rinses (alcohol- containing, alcohol-free and chlorhexidine-containing mouth rinses) and human saliva on microhardness of two types of composite resins (packable and nanofilled composite). Materials and Methods: Total numbers of 64 specimens were prepared, using molds specially fabricated for this study and divided according to type of composite resins used, into two groups: 32 specimens made from packable P60 and 32 specimens made from Filtek Supreme XT nanocomposite. Then each 32 specimens subdivided into 4 subgroups according to treatment solutions used (Listerine, oral-B, chlorhexidine containing mouth rinses and saliva). The specimens of each subgroup was immersed, after curing, in distilled water for 24hr at 37°C then subjected to microhardness measurement for baseline readings determination using Vickers microhardness tester. Then each subgroup was immersed in 20 ml of treatment solutions and incubated at 37°C for 24 hr and re-subjected to microhardness measurement. The change in hardness value was calculated for each sample. The resulting data were statistically analyzed using ANOVA and t- test at 0.05 significance level. Results: The results revealed that, all mouth rinses tested decreased the hardness of both tested resin-composites and non significant reduction in microhardness with saliva. Conclusion: Both alcohol-containing & alcohol-free mouth rinses cause, highly significant reduction in microhardness of composite resins while saliva causes non significant reduction in microhardness. Chlorhexidine-contaianing mouths rinses highly significant decrease the hardness of nanocomposite and significantly decrease the hardness of packable composite. | ||
| Keywords | ||
| Mouth rinses; saliva; composite resins; vicker | ||
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