Kalsiyum sillikat esaslý materyallerin farklý yapýlardaki dentin mikrosertliðine etkisi

GÝRÝÞ ve AMAÇ: Bu çalýþmanýn amacý, kalsiyum silikat esaslý MTA ve Endosequence BC materyallerinin kanal içinde ve dentin yüzeyinde meydana getirdiði mikrosertlik deðiþiminin incelenmesidir.
YÖNTEM ve GEREÇLER: Bu çalýþmada 100 adet çekilmiþ çürüksüz (50 premolar, 50 üçüncü molar) insan diþi kullanýldý. Premolar diþ köklerinin ve molar diþ kronlarýnýn orta üçlüsünden 2 mm kalýnlýðýnda kesitler elde edildi. Kesitlerin baþlangýç Knoop sertlik deðerleri kadedildi. Kesitler rasgele 6 gruba ayrýldý. Grup PEBC: Premolar diþ kesitlerinin kök kanalý içerisine Endosequence BC uygulandý. Grup MEBC. Molar diþ kesitlerin dentin yüzeyine Endosequence BC uygulandý. Grup MMTA: Molar diþ kesitlerinin dentin yüzeyine MTA uygulandý. Grup PMTA: Premolar diþ kesitlerinin kök kanalý içerisine MTA uygulandý. Grup PK ve Grup MK: Materyal uygulanmayan premolar ve molar diþ kesitleri kontrol grubu olarak belirlendi. 21 gün 37°C de bekletilen örnekler etüvden çýkarýlarak sertlik ölçümleri tekrarlandý. ANOVA ve Scheffe post hoc testi ile gruplar arasýndaki anlamlý fark %95 anlamlýlýk düzeyinde analiz edilmiþtir.
BULGULAR: Her iki materyal kontrol gruplarýna göre anlamlý derecede dentin sertlik azalmasýna yol açmýþtýr (p <.05). Materyallerin dentin yüzeyine uygulanmasý kök kanal içerisine uygulanmasýna göre her iki materyal için önemli derecede sertlik deðiþimine neden olmuþtur (p <.05).
TARTIÞMA ve SONUÇ: MTA ve Endosequence BC materyalleri dentin sertliðini azaltmýþtýr.

The effect of calcium silicate-based materials on the microhardness of different dentin structures

INTRODUCTION: The aim of this study is to examine the microhardness change caused by calcium silicate-based MTA and Endosequence BC materials in the canal and on the dentin surface.
METHODS: A total of 100 extracted caries-free (50 premolar, 50 third molar) human teeth were used in this study. Sections of 2 mm thickness were obtained from the middle third of premolar tooth roots and molar tooth crowns. The initial Knoop hardness values of the sections were measured. Sections were randomly divided into 6 groups. Group PEBC: Endosequence BC was applied into the root canal of premolar tooth sections. Group MEBC: Endosequence BC was applied to the dentin surface of the molar tooth sections. Group MMTA: MTA was applied to the dentin surface of molar tooth sections. Group PMTA: MTA was applied into the root canal of premolar tooth sections. Group PK and Group MK: Premolar and molar tooth sections without material were determined as the control group. The samples, which were kept at 37°C for 21 days, were removed from the incubator and their microhardness measurements were repeated. Significant difference between groups was analyzed with ANOVA and Scheffe post hoc test at 95% significance level.
RESULTS: Both materials caused a significant reduction of dentin microhardness compared to the control groups (p <.05). The application of the materials to the dentin surface caused a significant change in microhardness for both materials compared to the application into the root canal (p <.05).
DISCUSSION AND CONCLUSION: MTA and Endosequence BC materials reduced dentin microhardness.