Özet:

Introduction and Objective: The purpose of this study is to study the boundary microsis in Class V restorations, which are made with E: YAG laser or high-speed rotating instruments and performed using three different liquid composite materials. Method and Requirements: In this in-vitro study, a total of 33 large and linguistic surfaces of the third small teeth were prepared by Er: YAG laser or freze, class V spots were divided into six groups (n=11) and restored with three different liquid composites according to the manufacturer's company's instructions. Group 1: Preparation with laser (lh)+Estelite Flow Quick High Flow (EF); Group 2: lh+G-aenial Flo (GF); Group 3: lp+Herculite XRV Ultra Flow (HF); Group 4: Preparation with Frez (fh)+EF; Group 5: fh+GF; Group 6: fh+HF. After the thermal circle was applied, the samples were kept in a 0.5% methylene blue solution for 24 hours. The microscopy resulting from color penetration was studied under the stereomicroscope by x40 enlargement. The analysis of the data used the tests of Kruskal Wallis and Mann-Whitney U (p<0,05). The microscopic level in Group 3 is statistically significantly low compared to Group 2 (p: 0,042), while there is no significant difference in microscopic levels between the other groups. There was no statistically significant difference between the microsisity levels compared to the gingival and oclusal surfaces in the groups (p<0,05). The high-speed rotating tool or the Er: YAG laser application in the preparation of the V-class curve and the use of different liquid composite materials in the restoration of these curve does not affect the level of microsisection formed on the oclusal and gingival edges.

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