de Fátima Carvalho Souza Soraia, de Souza Douglas Nesadal, de Fátima Vasconcelos Pereira Adriana, Barroso Lúcia Pereira, Bombana Antonio Carlos
Adjunct Professor, Department of Endodontics, Federal University of Maranhão São Luís, Avenida dos Portugueses 1966 - Anjo da Guarda, São Luís, Maranhao, 65080-805, Brazil, e-mail:
Department of Dental Materials, São Paulo University, São Paulo, Brazil.
J Contemp Dent Pract. 2015 Jan 1;16(1):36-41. doi: 10.5005/jp-journals-10024-1632.
To evaluate the Influence of pH change and water storage up to 90 days on the sealing ability of two resin-based root-filling materials.
Forty-four human mandibular single-rooted teeth were instrumented and filled with gutta-percha/ AH Plus or Resilon/Epiphany SE (n=20 per group). Two teeth each were used as positive and negative controls. Specimens were set for 7 days under 100% humidity at 37°C. They were allocated into two subgroups (n=10) according to whether they were tested immediately or stored for up to 90 days in water before testing. Sealing ability was evaluated by passive dye penetration. Absorbance at 630 nm (in μg/ml) was measured by spectrophotometry. The pH values were obtained in triplicate. Data were submitted to ANOVA by post-hoc Tukey's test (α=0.05).
Specimens filled with Resilon/Epiphany SE exhibited more leakage than specimens filled with gutta-percha/AH Plus at the immediate time point (p<0.001). No differences were detected between the groups after storage, or between the materials with pH changes after 30, 60 and 90 days (p>0.05).
Gutta-percha/AH Plus provided superior sealing at the immediate time point. Water storage and pH changes did not Influence the sealing ability of tested materials.
These results suggest that Resilon/ Epiphany SE sealer offered no apparent advantage over the more conventional gutta-percha/AH Plus sealer technique in terms of sealing ability.
评估pH值变化及长达90天的水储存对两种树脂类根充材料封闭能力的影响。
选取44颗人下颌单根牙进行预备，分别用牙胶尖/AH Plus或Resilon/Epiphany SE进行充填（每组20颗）。另外各选两颗牙分别作为阳性和阴性对照。标本在37℃、100%湿度条件下放置7天。根据是否立即测试或将其在水中储存长达90天后再测试，将标本分为两个亚组（每组10颗）。通过被动染料渗透法评估封闭能力。采用分光光度法测量630nm处的吸光度（单位为μg/ml）。pH值重复测量三次。数据采用方差分析及事后Tukey检验（α=0.05）。
在即刻时间点，用Resilon/Epiphany SE充填的标本比用牙胶尖/AH Plus充填的标本表现出更多的微渗漏（p<0.001）。储存后两组之间以及30天、60天和90天后材料pH值变化组之间均未检测到差异（p>0.05）。
牙胶尖/AH Plus在即刻时间点提供了更好的封闭性。水储存和pH值变化并未影响受试材料的封闭能力。
这些结果表明，在封闭能力方面，Resilon/Epiphany SE封闭剂相对于更传统的牙胶尖/AH Plus封闭剂技术并无明显优势。
