SURFACE MICROHARDNESS AND ROUGHNESS PROPERTIES OF BIODENTINE

Abstract Aim: Endodontic irrigants may be used during a second-visit treatment or retreatment of root canals with perforations requiring repair biomaterials. After a final flushing with a chemical irrigant, some solution may remain in the root canal space, which can affect the surface of the biomaterial, altering its properties and roughness. The present study aimed to evaluate the effect of various irrigating solutions on surface microhardness and roughness of Biodentine (Septodont, Saint Maur des Fosses, France). Materials and Methods: Fifty Biodentine specimens were prepared and randomly divided into five groups, with 10 samples in each group. The specimens were then stored in different solutions for 5 min: distilled water (control), 5.25% sodium hypochlorite (NaOCl), 17% ethylenediaminetetraacetic acid (EDTA) solution, 2% chlorhexidine (CHX), or ozonated water. Surface microhardness (Vickers hardness number [VHN]) and surface roughness were evaluated using 2-D profilometry. The data were analyzed using Kruskal–Wallis and Mann–Whitney U tests. The significance level was set at P < 0.05. Results: The VHN of specimens exposed to NaOCl and CHX was significantly lower than the VHN of specimens exposed to distilled water and EDTA (p < 0.001, p = 0.003, p = 0.001, and p = 0.006, respectively). There was no so significant difference in the mean VHN of the EDTA-treated specimens versus that of the control samples (p = 0.999). Regarding the surface roughness of Biodentine, there were no significant differences between irrigation solutions (2 = 4.243; p = 0.374). Conclusions: Exposure to all the irrigation solutions, except EDTA and ozonated water had an adverse effect on surface microhardness of Biodentine, whereas none of the irrigation solutions significantly changed surface roughness. Therefore, in clinical situations, such as perforation repair with Biodentine, use of EDTA and ozonated water may be preferred. Keywords: Vickers surface microhardness, profilometry, irrigation solutions, Biodentine Cesitli Endodontik Irriganlarla Tedaviyi Takiben Biodentine’in Yuzey Mikrosertligi ve Puruzluluk Ozellikleri Oz Amac: Biomateryallerle tamir gerektiren perforasyonlu kok kanallarinin yeniden tedavisi veya ikinci-seans tedavisi esnasinda endodontik irriganlar kullanilabilir. Kimyasal bir irriganla son yikamadan sonra bir miktar solusyon kok kanal boslugunda kalabilir, bu da biyomateryalin sertlik ve yuzey ozelliklerini degistirebilir. Bu calisma cesitli irrigasyon solusyonlarinin Biodentine (Septodont, Saint Maur des Fosses, Fransa)’in yuzey mikrosertligi ve puruzlulugu uzerine etkisini degerlendirmeyi amaclamaktadir. Gerec ve Yontemler: Elli adet Biodentine ornegi hazirlandi ve rastgele olarak her grup 10 ornek icerecek sekilde bes gruba ayrildi. Sonrasinda ornekler farkli solusyonlarda 5 dakika bekletildi: distile su(kontrol), %5.25 sodyum hipoklorit (NaOCl), %17 etilendiamintetraasetik asit (EDTA) solution, %2 klorheksidin (CHX), veya ozonlu su. Yuzey mikrosertligi (Vickers sertlik degeri [VHN]) ve yuzey puruzlulugu 2-D profilometre kullanilarak degerlendirildi. Veriler Kruskal–Wallis ve Mann–Whitney U testleri kullanilarak degerlendirildi. Istatistiksel anlamlilik seviyesi P < 0.05 olarak belirlendi. Bulgular: NaOCl ve CHX’de bekletilen orneklerin VHN degerleri distile su ve EDTA’da bekletilenlere gore anlamli derecede dusuktur (p < 0.001, p = 0.003, p = 0.001, ve p = 0.006, sirasiyla). EDTA-uygulanmis orneklerin ortalama VHN degeriyle kontrol orneklerininki arasinda anlamli fark bulunmamaktadir (p = 0.999). Biodentine’in yuzey puruzlulugune iliskin ise irrigasyon solusyonlari arasinda anlamli fark bulunmamaktadir (2 = 4.243; p = 0.374). Sonuclar: EDTA ve ozonlu su haricindeki tum irrigasyon solusyonlarina maruz kalmanin Biodentine’in yuzey sertligi uzerine olumsuz etkisi bulunsa da, diger taraftan irrigasyon solusyonlarinin hicbiri yuzey puruzlulugunu anlamli derecede degistirmemistir. Bundan dolayi, Biodentine ile perforasyon tamiri gibi klinik durumlarda, EDTA ve ozonlu su kullanimi tercih edilebilir. Anahtar kelimeler: Vickers yuzey mikrosertligi. profilometre, irrigasyon solusyonlari, Biodentine