Department of Prosthodontics and Dental Research Center, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
J Prosthodont Res. 2013 Oct;57(4):284-7. doi: 10.1016/j.jpor.2013.08.002. Epub 2013 Oct 4.
The aim of this study was to compare the effects of two endodontic sealers on the retention of posts cemented with zinc phosphate or resin cement.
Crowns of 72 mandibular premolars were removed at the cementoenamel junction. Root canals were prepared and specimens were randomly divided into two groups of 36. In each group, 12 specimens were obturated with gutta percha only; 12 specimens with gutta percha/ZOE sealer and 12 specimens with gutta percha/AH26. In the first group, 10mm Post spaces were prepared with Peeso reamers size 4 and, size 5 stainless steel Paraposts were cemented in with zinc phosphate. In the second group, 10mm Post spaces were prepared with Fiber Lux size 5.5 drills and size 5 Paraposts were cemented with Panavia F2.0. After mounting in resin blocks, posts were pulled out by universal testing machine at 1mm/min and results were analyzed by two-way ANOVA and Dunnett test.
Mean forces (in Newtons) required to remove posts cemented with zinc phosphate in canals obturated without sealer, with ZOE, and with AH26 sealers were 270±83, 281±128 and 266±67, respectively; and for posts cemented with Panavia F2.0 were 520±290, 464±212 and 229±108, respectively. Statistical analysis showed that AH26 significantly reduced retention of posts cemented with Panavia F2.0 (p<0.05).
Different sealers had no significant effect on retention of posts cemented with zinc phosphate. However posts cemented with Panavia F2.0 showed reduced retention in canals obturated with AH26.
本研究旨在比较两种根管封闭剂对使用氧化锌磷酸或树脂水门汀黏固的桩核固位力的影响。
从 72 颗下颌前磨牙的牙颈部将牙冠去除。预备根管，将样本随机分为两组，每组 36 个样本。每组 12 个样本使用牙胶仅封闭；12 个样本使用牙胶/ZOE 封闭剂封闭；12 个样本使用牙胶/AH26 封闭剂封闭。在第一组中，使用 Peeso 扩孔钻（尺寸 4 和 5）预备 10mm 的桩道，使用磷酸锌水门汀黏固尺寸为 5 的不锈钢 Parapost。在第二组中，使用 Fiber Lux 钻（尺寸 5.5）预备 10mm 的桩道，使用 Panavia F2.0 黏固尺寸为 5 的 Parapost。将样本安装在树脂块中后，使用万能试验机以 1mm/min 的速度将桩拔出，并使用双因素方差分析和 Dunnett 检验对结果进行分析。
未使用封闭剂、使用 ZOE 封闭剂和使用 AH26 封闭剂黏固的磷酸锌水门汀封闭的根管中黏固的桩在移除时所需的平均力（牛顿）分别为 270±83、281±128 和 266±67；使用 Panavia F2.0 黏固的桩的平均力分别为 520±290、464±212 和 229±108。统计分析显示，AH26 显著降低了使用 Panavia F2.0 黏固的桩的固位力（p<0.05）。
不同的封闭剂对使用氧化锌磷酸黏固的桩核固位力没有显著影响。然而，使用 AH26 封闭剂封闭的根管中黏固的使用 Panavia F2.0 黏固的桩的固位力降低。
