Author(s):
1. Ognjenka Janković, Republic of Srpska, Bosnia and Herzegovina
2. Smiljana Paraš, Republic of Srpska, Bosnia and Herzegovina
3. Radmila Arbutina, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
4. Irena Kuzmanović Radman, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
5. Tijana Adamović, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
6. Valentina Veselinović, University of Banja Luka, Medical Faculty, Republic of Srpska, Bosnia and Herzegovina
7. Vladan Mirjanić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina

Abstract:
Introduction/aim of this study was to assess the microleakage of class II restorations with different flowable composites liners. Materials and Methods: 4o extracted human premolars teeth with class II cavity preparation (80 cavities) were divided into four groups and filled as follows: 1. Vertise flow +micro hybrid composite Herculite; 2. Surefil SDR flow+ micro-hybrid composite Herculite 3. Tetric flow + micro-hybrid composite Herculite 4. control group micro-hybrid composite Herculite. Mesial cavities are polymerized with a classic but distal soft start technique of polymerization After that, the samples were immersed in a 0.5% AgNO3 solution and sectioned into the mesiodistal direction. Using a stereomicroscope (Nikon - Japan), with a magnification of 40x, gingival microleakage of cavities was examined. Data were analyzed using Fisher's and Student's tests. Results: After using the conventional polymerization technique, all of three used flowable composites VF + Herculite, SDRF + Herculite, TF + Herculite were less gingival microleakage than control. This difference was statistically significant. After the application of the soft start technique of polymerization, only VF + Herculite and SDRF + Hercules showed a statistically significant reduction in gingival microleakage, while TF + Herculite showed a comparable control result, with no statistically significant difference. The soft start technique proved to be better than the conventional polymerization technique, but without a statistically significant difference. Conclusion. Flowable composites in this study have reduced gingival microleakage and can be used as liners in the restoration of cavities of II class.

Key words:
Microleakage, class II restoration, flowable composite, polymerization.

Thematic field:
SYMPOSIUM B - Biomaterials and nanomedicine

Date of abstract submission:
27.05.2019.

Conference:
Contemporary Materials 2019 - Savremeni Materijali