Calcium hydroxide dressings using different preparation and application modes: density and dissolution by simulated tissue pressure
Calcium hydroxide dressings using different preparation and application modes: density and dissolution by simulated tissue pressure
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DOI：
10.1111/j.1365-2591.2005.01035.x
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发表时间：
2005-12-01
影响因子：
5
通讯作者：
Peters, OA
中科院分区：
文献类型：
--
作者：
Peters, CI;Koka, RS;Peters, OA
目的 研究制备的模拟根管中不同根尖形状对通过注射器或双头螺旋应用商业制备的氢氧化钙糊剂的影响。 方法 在 90 个模拟根管中进行了三种不同类型的根管预备：A 组使用手动和旋转器械进行根尖尺寸 20 和 0.10 锥度，B 组使用 GT 旋转器械进行根尖尺寸 30 和 0.08 锥度，C 组使用 GT 旋转器械进行根尖尺寸40 和 0.04 锥度，使用 ProFile 0.04 仪器。氢氧化钙 [Ca(OH)(2)] 糊剂的插入是使用 lentulo 螺旋或注射器完成的。使用生理盐水溶液对根管顶端施加模拟流体压力 1 周后，评估溶液中释放的 Ca(OH)(2)。在制备后、插入 Ca(OH)(2) 糊剂后、用 Cavit 临时化后以及模拟流体压力 1 周后，对样本进行初始称重。拍摄填充根管的数字射线照片，测量根管面积（mm(2)）、Ca(OH)(2) 敷料的灰度值、空隙总面积（mm(2)）以及根管根尖、中部或冠部三分之一处的空隙位置。进行了方差分析、Scheffe 事后检验以及卡方检验。结果 C 组中的根管的放射照相空隙明显少于 A 组和 B 组中的根管 (P < 0.01)。与注射技术相比，使用 lentulo 螺旋导致空隙显着减少 (P < 0.05)。与中根管和根尖部三分之一处相比，冠状部检测到更多的空洞（P < 0.05）。结论 根管形状和使用方法对模拟根管中氢氧化钙敷料的用量和放射密度有影响。根尖尺寸为 40、锥度为 0.04 的根管具有最少的空隙数量；与注射技术相比，使用 lentulo 螺旋放置的 Ca(OH)(2) 的空隙明显减少。
Aim To study the effect of different apical shapes in prepared simulated root canals on the application of a commercially prepared calcium hydroxide paste by a syringe or lentulo spiral.Methodology Three different types of root canal preparation were performed in 90 simulated canals: group A to an apical size 20 and a 0.10 taper using hand and rotary instruments, group B to an apical size 30 and a 0.08 taper using GT rotary instruments and group C to an apical size 40 and a 0.04 taper using ProFile 0.04 instruments. The insertion of calcium hydroxide [Ca(OH)(2)] paste was accomplished using either a lentulo spiral or a syringe. After 1 week of simulated fluid pressure applied to the apical end of the canal using physiological saline solution, the solution was evaluated for released Ca(OH)(2). The specimens were weighed initially, after preparation, after insertion of Ca(OH)(2) paste, after temporization with Cavit and after 1 week of simulated fluid pressure. Digital radiographs of the filled canals were taken and canal areas in mm(2), gray values of the Ca(OH)(2) dressings, total area of voids in mm(2), as well as location of voids in the apical, middle or coronal thirds of the root canals were measured. Analyses of variance, with Scheffe's post-hoc tests, as well as chi-square tests were performed.Results Canals in group C had significantly fewer (P < 0.01) radiographic voids than canals in groups A and B. Using a lentulo spiral resulted in significantly (P < 0.05) fewer voids compared with the injection technique. More voids were detected coronally compared with middle and apical root canal thirds (P < 0.05).Conclusions Canal shape and method of application had an impact on the amount and radiodensity of calcium hydroxide dressings in simulated root canals. Canals prepared to an apical size 40 and a taper of 0.04 had the least number of voids; Ca(OH)(2) was placed with significantly fewer voids using a lentulo spiral compared with the injection technique.