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Abstrak :
ABSTRAK
Objective: In this study, we aimed to compare efficacy of various irrigating solutions for smear layer removal and dentin microhardness. Methods: Based on the four final irrigants used plus saline control, 50 single rooted teeth were divided into five groups. Using a step back technique with K files, chemomechanical preparation was performed. Canals were apically enlarged up to ISO size 40 and stepped back up to ISO size 60. During preparation, irrigation was performed with 2.5% NaOCl solution and the roots were sectioned into two halves. In the coronal, middle, and apical thirds, the smear layer was evaluated by scanning electron microscopy in one half, whereas the dentin microhardness was evaluated in the other half. Results: For all irrigants in the coronal and middle third regions, the efficacy of smear layer removal was comparable. Doxycycline, citric acid, Tween 80 (MTAD) and 10% maleic acid were the most effective for the apical third region, followed by 7% maleic acid and 17% ethylenediaminetetraacetic acid (EDTA). Dentin microhardness was most affected by MTAD and 10% maleic acid, followed by 17% EDTA and 7% maleic acid. Conclusion: For removal of smear layer and the least effect on dentin microhardness, 7% maleic acid was effective.

Abstrak :
Tujuan: Menganalisis perbedaan microhardness dan flexural strength dentin saluran akar setelah paparan berbagai larutan irigasi endodontik regeneratif. Metode: Tiga puluh enam sampel dentin gigi manusia yang baru diekstraksi dibagi menjadi 6 kelompok yaitu 2 kelompok kontrol (NaCl 0,9%), 2 kelompok uji 1 diirigasi dengan 20 ml NaOCl 1,5% selama 5 menit – 3 ml NaCl 0,9% selama 3 menit – 20 ml EDTA 17% selama 5 menit, 2 kelompok uji 2 diirigasi dengan 20 ml NaOCl 1,5% selama 5 menit – 3 ml PBS 10% selama 3 menit – 20 ml EDTA 17% selama 5 menit – 3 ml PBS 10% selama 3 menit. Perubahan microhardness dan flexural strength dievaluasi dengan uji Vickers dan 3-Point Flexural Tester. Data dianalisis menggunakan One-Way ANOVA dan Tamhane. Hasil: Terdapat perbedaan bermakna antar kelompok uji 1 dan 2 dengan kelompok kontrol (One-Way ANOVA, p < 0,05). Berdasarkan uji Post Hoc (Tamhane, p<0,05) terdapat perbedaan bermakna microhardness dan flexural strength kelompok uji 2 dibandingkan kelompok uji 1, dengan nilai rerata lebih tinggi pada kelompok uji 2 terhadap kelompok uji lainnya. Kesimpulan: Kelompok uji 2 memiliki nilai microhardness dan flexural strength lebih baik sebagai bahan regenerasi endodontik regeneratif. ......Objective: To analyze the differences in microhardness and flexural strength of root canal dentin after exposure various regenerative endodontic irrigation solution. Methods: Thirty-six dentine samples from fresh extracted were assigned to 6 groups, two groups as a control (NaCl 0,9%), two test groups 1 (20 ml NaOCl 1,5% for 5 min – 3 ml NaCl 0,9% for 3 min – 20 ml EDTA 17% for 5 min), two test groups 2 (20 ml NaOCl 1,5% for 5 min – 3 ml PBS 10% for 3 min – 20 ml EDTA 17% for 5 min – 3 ml PBS 10% for 3 min). The changing of microhardness and flexural strength were evaluated using Vickers and 3-point flexural tester. Data were analysed using One-Way ANOVA and Tamhane. Result: There was significant difference between test groups 1 and 2 with control group (One-Way ANOVA, p < 0,05). Based on the Post hoc test (Tamhane, p < 0,05 ), showed significant difference in microhardness and flexural strength between group 2 and group 1, with higher mean in test group 2 compared to other test groups. Conclusion: Test group 2 had better microhardness and flexural strength as regenerative endodontic irrigation.