Author(s):
1. Ognjenka Janković, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
2. Renata Josipović, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
3. Radmila Arbutina, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
4. Igor Đukić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
5. Mirjana Umićević Davidović, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
6. Marijana Arapović Savić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
7. Verica Pavlić, PHI Institute of Dentistry, Banja Luka, Republic of Srpska, Bosnia and Herzegovina
8. A. Arbutina, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina

Abstract:
Introduction: Composite materials to contract during the polymerization process which lessens their clinical value. Modifications in the composition of the composite material and application technique proved to be insufficient to compensate for the polymerization shrinkage, and tried a modification of polymerization modes. Objective: The objective of this work was to be check the influence of different polymerization techniques to polymerization shrinkage of class V cavities. Materials and Methods: The 30 premolars with two Class-V-cavities were used in the present study. Vestibular cavities were restored with Vertise Flow, and oral cavities with Filtek Flow. For polymerization is used Led lamp which supports three programs of light curing: High Power, Low Power and Soft smart polymerization. The samples were then immersed in AgNO3, then immersed in a 10% solution of photo developer. Dye penetration, occlusal and gingival, assessed using a binocular magnifier with a micrometer scale. Results: The results showed that the total dye penetration in all teeth cured by conventional curing technique (4.46 µm) was slightly higher compared to the dye penetration restorations polymerized soft start curing technique (4.27 µm) and slightly lower compared to dye penetration restorations polymerized pulse curing technique (5.54 µm). Statistical analysis revealed no significant difference in dye penetration depending on the polymerization techniques (p = 0.057), although the values of dye penetration soft start techniques are somewhat lower than for pulsed and classical techniques. Conclusion: Slightly better results in the application of soft start polymerization techniques explained that it is a two-phase technique, which in the initial stage polymerization cycle hire irradiance smaller values, for which the polymerization full intensity.

Key words:
polymerization shrinkage, polymerization technology, composite materials

Thematic field:
SYMPOSIUM B - Biomaterials and nanomedicine

Date of abstract submission:
26.04.2016.

Conference:
Contemporary Materials 2016 - Savremeni Materijali

Final paper