Grazziotin-Soares Renata, Dourado Letícia Gomes, Gonçalves Bruna Lais Lins, Ardenghi Diego Machado, Ferreira Meire Coelho, Bauer José, Carvalho Ceci Nunes
Department of Restorative Dental Sciences, College of Dentistry, University of Florida, Gainesville, FL 32610, USA.
School of Dentistry, CEUMA University, São Luís, 65065-470, Brazil.
Materials (Basel). 2020 Feb 5;13(3):721. doi: 10.3390/ma13030721.
This study investigated the human dentin microhardness (MH) and the MTA Fillapex (Fillapex) and AH Plus(AH) bond strength (BS) to dentin after using calcium hydroxide (Ca(OH)) and bioactive glasses (45S5 and an experimental niobium phosphate bioactive glass (NbG)) as intracanal medications. For the MH test dentin slices were filled with medications and were submitted to Knoop MH (KHN) test (at day-0 (baseline data/without medication) and at day-15 (after using medication)). For the BS test, after medications had remained for 15 days in the roots, dentin slices were obtained and filled with the sealers. Seven days later, sealer BS to dentin was measured by push-out test (MPa). Data were statistically analyzed. Failure mode was visually assessed. The use of NbG, 45S5 for 15 days, increased the dentin MH and reduced the BS between AH sealer and dentin, but did not interfere with the Fillapex BS.
本研究调查了使用氢氧化钙（Ca(OH)₂）和生物活性玻璃（45S5以及一种实验性磷酸铌生物活性玻璃（NbG））作为根管内用药后，人类牙本质的显微硬度（MH）以及MTA Fillapex（菲拉派克斯）和AH Plus（AH）与牙本质的粘结强度（BS）。对于显微硬度测试，将牙本质切片用药物填充，并进行努氏显微硬度（KHN）测试（在第0天（基线数据/未用药）和第15天（用药后））。对于粘结强度测试，在药物在牙根中留存15天后，获取牙本质切片并用封闭剂填充。7天后，通过推出试验（MPa）测量封闭剂与牙本质的粘结强度。对数据进行统计学分析。通过视觉评估失败模式。使用NbG、45S5 15天，增加了牙本质的显微硬度并降低了AH封闭剂与牙本质之间的粘结强度，但未干扰菲拉派克斯的粘结强度。
