Dalat D M, Spångberg L S
Department of Restorative Dentistry and Endodontology, School of Dental Medicine, University of Connecticut Health Center, Farmington.
J Endod. 1994 Jul;20(7):315-9. doi: 10.1016/s0099-2399(06)80092-0.
In this study, residual apical microlumina remaining after obturation with five different gutta-percha obturation methods were traced with an efficient vacuum method. Seventy-nine human maxillary anterior teeth were instrumented and divided into five groups. The groups were obturated with single-cone techniques, lateral condensation, vertical condensation, Thermafil, and Ultrafil techniques. All specimens were immersed in a vacuum flask containing 2% methylene blue dye solution. The air was evacuated with a vacuum pump to an absolute pressure of 75 torr for 30 min. The roots were sectioned longitudinally and the linear extent of dye penetration was measured. Group mean linear dye penetration values were: single-cone technique, 1.55 +/- 0.95 mm; lateral condensation, 2.25 +/- 1.46 mm; vertical condensation, 2.61 +/- 2.61 mm; Thermafil 1.41 +/- 1.16 mm; and Ultrafil 3.51 +/- 4.70 mm. There were no statistically significant differences between the gutta-percha obturation methods. The clinical implications of these findings are discussed.
在本研究中，采用一种有效的真空方法追踪了用五种不同牙胶尖充填方法充填后剩余的根尖微管腔。对79颗人上颌前牙进行预备并分为五组。这些组分别采用单尖技术、侧方加压、垂直加压、热牙胶充填和超声热塑牙胶充填技术进行充填。所有标本均浸泡在装有2%亚甲蓝染料溶液的真空烧瓶中。用真空泵将空气抽至绝对压力75托并保持30分钟。将牙根纵向切开并测量染料渗透的线性范围。各组染料渗透线性平均值分别为：单尖技术，1.55±0.95毫米；侧方加压，2.25±1.46毫米；垂直加压，2.61±2.61毫米；热牙胶充填，1.41±1.16毫米；超声热塑牙胶充填，3.51±4.70毫米。牙胶尖充填方法之间无统计学显著差异。讨论了这些发现的临床意义。
