Jorge Karin Milena, de Carvalho Roberta Ferreira, Vieira Verena Luzia Bredt, Gabardo Marilisa Carneiro Leão, Gonçalves Letícia Machado, Deonizio Marili Doro Andrade
Department of School of Health and Biosciences, Pontificia Universidade Catolica do Parana, Parana, Brazil.
Professor, Department of Dentistry, Universidade Positivo, Parana, Brazil, Phone: +554133173180, e-mail: marilisagabardo @e-odonto.com.
J Contemp Dent Pract. 2015 Jun 1;16(6):468-73. doi: 10.5005/jp-journals-10024-1708.
The aim of this study was to investigate the influence of calcium hydroxide dressing on the filling of simulated lateral canals by different obturation techniques.
Sixty single-root-premolars were instrumented. Simulated lateral canals were drilled on each third of the roots. The teeth were divided into four groups: no dressing and obturation by lateral condensation technique (G1), dressing with calcium hydroxide and obturation by lateral condensation technique (G2), no dressing and obturation by hybrid technique (G3) and, dressing with calcium hydroxide and obturation by hybrid technique (G4). The teeth were maintained at 37°C in 100% humidity for 7 days, and obturation techniques were performed. Radiographs were taken and filled or unfilled lateral canals were counted. Data were analyzed using analysis of variance (ANOVA) followed by Tukey's test (a = 5%).
The hybrid technique filled large number of lateral canals as compared to lateral condensation technique, regardless the use of intracanal medication (p < 0.05). Calcium hydroxide decreased the number of lateral canals filled for both lateral and hybrid techniques (p < 0.05). Significant differences were observed when comparing the number of filled and unfilled lateral canals in the same root third of each group (p < 0.05).
Regardless the obturation technique, calcium hydroxide dressing reduced the penetration of filling material in simulated lateral canals.
The persistence of calcium hydroxide residues reduces the penetration of filling material in simulated lateral canals, possibly representing a potential cause of failure in the future.
本研究旨在探讨氢氧化钙封药对不同充填技术充填模拟侧支根管的影响。
选取60颗单根前磨牙进行根管预备。在牙根的每三分之一处钻出模拟侧支根管。将牙齿分为四组：不封药并采用侧向加压充填技术（G1组）、用氢氧化钙封药并采用侧向加压充填技术（G2组）、不封药并采用混合充填技术（G3组）以及用氢氧化钙封药并采用混合充填技术（G4组）。将牙齿在37°C、湿度100%的环境中保存7天，然后进行充填技术操作。拍摄X线片并统计已充填或未充填的侧支根管数量。采用方差分析（ANOVA），随后进行Tukey检验（α = 5%）对数据进行分析。
与侧向加压充填技术相比，无论是否使用根管内药物，混合充填技术充填的侧支根管数量更多（p < 0.05）。氢氧化钙减少了侧向加压充填技术和混合充填技术充填的侧支根管数量（p < 0.05）。比较每组同一牙根三分之一处已充填和未充填侧支根管的数量时，观察到显著差异（p < 0.05）。
无论采用何种充填技术，氢氧化钙封药均会降低充填材料在模拟侧支根管中的渗透。
氢氧化钙残留的存在会降低充填材料在模拟侧支根管中的渗透，这可能是未来失败的一个潜在原因。
