Minnich S G, Hartwell G R, Portell F R
J Endod. 1989 May;15(5):204-9. doi: 10.1016/S0099-2399(89)80236-5.
This study investigated the seal created by cold burnishing the gutta-percha exposed after apical root resection of endodontically treated teeth. Sixty single-rooted extracted human teeth with a single straight canal were divided into four experimental groups of 15 teeth each. In two of the experimental groups the canals were instrumented and obturated well with laterally condensed gutta-percha and sealer. The remaining two groups were instrumented and poorly obturated with laterally condensed gutta-percha and sealer. The apical 2 mm of all the teeth were then resected and the effect of cold burnishing the exposed gutta-percha was investigated using a linear dye penetration technique. Under the condition of this study, cold burnishing gutta-percha after apical root resection of a well-obturated root canal resulted in a poorer apical seal than if no burnishing were performed. Cold burnishing the exposed gutta-percha after apical root resection of poorly obturated root canals improved the apical seal as compared with nonburnished poorly obturated canals.
本研究调查了对根管治疗后进行根尖切除时暴露的牙胶进行冷压光所形成的封闭效果。60颗具有单一直根管的拔除人单根牙被分为四个实验组，每组15颗牙。在两个实验组中，根管进行预备并使用侧向加压牙胶和封闭剂良好地充填。其余两组进行根管预备，但使用侧向加压牙胶和封闭剂充填不佳。然后切除所有牙齿的根尖2毫米，并使用线性染料渗透技术研究对暴露牙胶进行冷压光的效果。在本研究条件下，根管充填良好的牙根进行根尖切除后对牙胶进行冷压光，与未进行压光相比，根尖封闭性较差。根管充填不佳的牙根进行根尖切除后，对暴露的牙胶进行冷压光，与未进行压光的充填不佳根管相比，根尖封闭性得到改善。
