Er; Cr: Ysgg Lazerin Farklı Parametrelerinin ve Florürün Daimi Diş Minesinin Çürüğe Karşı Direncini Artırmadaki Etkilerinin İncelenmesi
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ÖZDEMİR N. Investigation of increasing resistance to caries effects of the different parameters of Er,Cr: YSGG laser and fluoride on permanent tooth enamel. Hacettepe University, Speciality Thesis in Paediatric Dentistry, Ankara, 2017. In the literature, there has not been sufficient information regarding the required laser power and the use of laser before or after fluoride application. The purpose of this study is to evaluate the effect of Er,Cr: YSGG laser, used with two different parameters as well as before and after fluoride gel application, on the microhardness of the permanent tooth enamel. 104 extracted human impacted permanent third molars were used. After the measurement of the initial microhardness values, the teeth were randomly divied into eight groups (n=13): Group I-Control (K); Group II-Fluoride (F); Grup III-Laser 0,25 W (L 0,25W); Grup IV-Laser 0,50 W (L 0,50W); Grup V-L 0,25 W +F; Grup VI-L 0,50 W + F; Grup VII-F + L 0,25W; Grup VIII-F +L 0,50 W. After the procedures and pH cycling, microhardness measurements were repeated and the data were evaluated statistically. In the experimental groups, microhardness after the procedure compared to the baseline (ΔA) increased (p <0,01). In all groups, microhardness after the pH cycling compared to post-procedure (ΔB) and microhardness after the pH cycling compared to baseline (ΔC) decreased (p <0.01). There was a significant difference between the control group and all experimental groups, in terms of ΔA (p <0,05). There was a significant difference between the control group and all experimental groups, excluding the groups 2 (F) and 3 (L 0,25 W), in terms of ΔB and ΔC (p <0,05). There was a significant difference between the experimental groups of Group 2 (F) and Group 6 (L 0,50 W + F) (p <0,05) in terms of ΔC (p <0,05). As a conclusion, with respect to caries prevention of permanent teeth, there was no difference between the two different parameters of Er,Cr:YSGG laser, between fluoride and laser, between the application of fluoride before or after laser. However, the increased effectiveness of fluoride when used after Er,Cr: YSGG laser with 0.50 W power implied the possible effective use of laser in preventive clinical applications.