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Purpose: It has been studied in various studies in which the heat that occurs during polymerization by the light source of the resin-based dental restorative materials may cause biological damage to the pulp. The purpose of this in vitro study is to compare the heat change that occurs during the polimerization of two different low-viscosity restorative materials using two different LED light sources. Tools and Methods: Two different liquid composite restoration materials; Filter-Ultimate Liquid (3M ESPE, St Paul, MN, USA) and SDR; Smart Dentin Replacement Material(Dentsply Caulk, Milford, DE, USA) two different LED light sources; EliparS10(3M ESPE, St Paul, MN, USA) and WoodPecker-LEDB(Keju Med.Prod.Foshan, China) have recorded thermal changes by polyming. In the study, restorative materials were placed in the teflon patterns at a diameter of 10 mm, a height of 2 mm, and from the beginning the heat changes occurring during light and polymerization were placed on the bottom of the teflon patterns, computerized by measuring the digital thermometer. In total, 320 of the 80 samples of heat measurements have been realized. The statistical analysis was done using the IBM SPSS Statistics22 program. Results: The average heat difference that occurs during the polimerization of the filter-Ultimate liquid composite restorative material with the Elipar Led light source was significantly higher than the average heat difference that occurs with the Woodpecker Led light source (19,07±2,52- 12,79±1,61). Similarly, the SDR-Elipar starting-heat difference average is significantly higher than the SDR-Woodpecker starting-heat difference average (15,95±0,97-14,08±1,18). When compared two restorative matter-line, the filter-Ultimate-Elipar heat difference was significantly higher than the SDR-Elipar heat difference average. The temperature difference that occurs during polymerization of both light sources and low viscosity of two filling materials is more than 5.5 ̊C. It should be taken into account that the use of liquid restorative materials near the pulp, in the deep caves - the mass can leave irreversible damage to the pulp. Keywords: Dental light source, resin composites, photo-activation, polymerization, heat increase COMPARISON OF TEMPERATURE CHANGE IN TWO FLOWABLE RESTORATIVE MATERIALS DURING POLYMERIZATION WITH LED LIGHT CURING UNIT AIM: As it was previously, the heat generated during polymerization of the resin based dental restorative materials may cause harmful biological effects on pulpal tissue. The aim of this in-vitro study was to measure and compare the increase in temperature of two different flowable dental restorative materials during polymerization with two different LED-Light curing units. Materials and Methods: Two low-viscosity resin based composites; Filtek-Ultimate Flow(3M-ESPE, StPaul, MN, USA) and SDR; Smart Dentin Replacement(Dentsply-Caulk, Milford,DE, USA) were photo-activated with two different LED-Light curing units; EliparS10(3M-ESPE, StPaul, MN, USA) and WoodPecker-LEDB(Keju Med. Prod., Foshan, China) and the change in temperature was recorded during the polymerization process. Restorative materials were placed into a Teflon mould with a cylindrical opening 10mm in diameter and 2mm in height and the change in temperature during light curing was recorded with a thermal probe connected to a digital precision thermometer. 320 recordings were made out of 80 specimens. Statistical data analysis was made using IBM SPSS Statistics22. Results: The average temperature increase of Filtek-Ultimate Flow during light curing with Elipar(3M ESPE) was significantly higher than with WoodPecker (19,07± 2,52- 12,79±1,61). Likewise, the average temperature increase of SDR during light curing with Elipar(3M ESPE) was significantly higher than with Woodpecker (15,95±0,97-14,08±1,18). Comparing the two restorative materials, the average temperature increase of Filtek-Ultimate Flow was significantly higher than SDR while curing with Elipar. The average temperature increase in both restorative materials during polymerization with either LED-light curing units were higher than that of 5.5 ̊C. Low-viscosity restorative materials should be considered carefully within deep cavities as they may cause irreversible harmful effects to dental pulp during polymerization. Keywords: Dental light curing units, resin composites, photo-activation, polymerization, temperature increase

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