Marquezan Flavia Kolling, Kopper Patricia Maria Poli, Dullius Angela Isabel Dos Santos, Ardenghi Diego Machado, Grazziotin-Soares Renata
Department of Conservative Dentistry, UFRGS - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
Department of Statistics, UFSM - Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
Braz Dent J. 2018 Mar-Apr;29(2):189-194. doi: 10.1590/0103-6440201801766.
This study investigated the effect of blood-contamination on the push-out bond strength of BiodentineTM (BD) and MTA Angelus® (MTA-A) to root dentin over time. Twenty-five teeth were sectioned horizontally to obtain 120 root slices. The lumens were filled with MTA-A or BD: 60 for each cement (30 uncontaminated and 30 blood contaminated). Push out bond strength to dentin was assessed at 24 h (n=10), 7 days (n=10) and 28 days (n=10). Failure modes were classified as: cohesive, adhesive or mixed failure. Two-way ANOVA was used to investigate the interaction between blood contamination vs. hydration period. Mann Whitney test compared different materials in each period, and it also compared the contaminated versus uncontaminated material for each period. Friedman, followed by Dunn`s test, compared periods of hydration for each material, regardless of blood contamination. Failure modes were reported descriptively. The interaction hydration period vs. blood contamination was highly significant for MTA-A (P=0.001) and it was not significant for BD (P=0.474). There were no differences between bond strength of uncontaminated and contaminated BD in any of the periods. Bond strength of uncontaminated MTA-A increased at each time of hydration; but it remained stable over time for blood-contaminated samples. BD had higher bond strength than MTA-A in all periods of hydration. Cohesive failure predominated. Only for MTA-A, the over time bond strength to dentin was affected by blood contamination.
本研究调查了血液污染对生物陶瓷（BiodentineTM，BD）和天使us MTA（MTA Angelus®，MTA - A）与牙根牙本质之间的推出粘结强度随时间的影响。将25颗牙齿水平切片以获得120个牙根切片。髓腔用MTA - A或BD填充：每种粘结剂60个样本（30个未受污染的和30个受血液污染的）。在24小时（n = 10）、7天（n = 10）和28天（n = 10）时评估与牙本质的推出粘结强度。失效模式分为：内聚性、粘结性或混合性失效。采用双向方差分析来研究血液污染与水化期之间的相互作用。曼 - 惠特尼检验比较了各时期不同材料之间的差异，同时也比较了各时期受污染与未受污染材料之间的差异。弗里德曼检验，随后进行邓恩检验，比较了每种材料的水化期，不考虑血液污染情况。对失效模式进行了描述性报告。对于MTA - A，水化期与血液污染之间的相互作用高度显著（P = 0.001），而对于BD则不显著（P = 0.474）。在任何时期，未受污染和受污染的BD的粘结强度之间均无差异。未受污染的MTA - A在每次水化时粘结强度均增加；但对于受血液污染的样本，其粘结强度随时间保持稳定。在所有水化期，BD的粘结强度均高于MTA - A。内聚性失效占主导。仅对于MTA - A，其与牙本质随时间的粘结强度受血液污染影响。
