Vier-Pelisser Fabiana Vieira, Meng Ariane, Benedete Netto Leticia Caroline, Só Marcus Vinicius Reis
Post-graduate Program in Dentistry, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil.
Indian J Dent Res. 2012 Nov-Dec;23(6):784-8. doi: 10.4103/0970-9290.111260.
This study evaluated the influence of the instrumentation technique and apical preparation size on the filling capacity of a calcium hydroxide (CH)-based paste.
Fifty simulated curved canals were prepared in acrylic blocks (five groups; n = 10 each). In three groups, the canals were preflared with Gates-Glidden drills and the apical stop was prepared with #25, 30 or 35 Flexofile files. In the other two groups, the canals were prepared with ProTaper rotary instruments and the apical stop was prepared with F1 and F2. A CH paste was injected into the canals using a special syringe. The four sides of the blocks were scanned with the root curvature to the mesial, buccal, distal and palatal faces. The amount (%) of filling in the total canal area and in the apical 5 mm was obtained [analysis of variance (ANOVA); Tukey's test; α = 0.05]. Qualitative analysis of apical filling was done (absence vs. presence of filling deficiencies) (chi-square test; α = 0.05).
There was no significant difference in canal filling among the groups at any block side. Presence of voids was associated with the simulated mesial and distal faces.
An effective canal filling with the CH paste was not achieved in all cases. Canal filling failure occurred mostly in the apical third. Filling deficiencies can be better visualized in canals with mesial and distal root curvatures.
本研究评估了根管预备技术和根尖预备尺寸对氢氧化钙（CH）基糊剂充填能力的影响。
在丙烯酸树脂块中制备50条模拟弯曲根管（分为五组，每组n = 10）。三组根管先用盖茨 - 格利登钻进行预扩，然后分别用#25、30或35号Flexofile锉制备根尖止点。另外两组根管则用ProTaper旋转器械进行预备，并用F1和F2制备根尖止点。使用特制注射器将CH糊剂注入根管。对树脂块的四个面进行扫描，根管弯曲方向分别朝向近中、颊侧、远中和腭侧。获取根管总面积及根尖5 mm处的充填量（%）[方差分析（ANOVA）；Tukey检验；α = 0.05]。对根尖充填情况进行定性分析（有无充填缺陷）（卡方检验；α = 0.05）。
在任何树脂块面，各组间根管充填情况均无显著差异。空洞的出现与模拟的近中面和远中面有关。
并非所有情况下使用CH糊剂都能有效充填根管。根管充填失败大多发生在根尖三分之一处。在有近中和远中根管弯曲的根管中，充填缺陷能更清晰地显现。
