Department of Odontology, Paranaense University, Cascavel, Brazil.
J Endod. 2011 Sep;37(9):1213-6. doi: 10.1016/j.joen.2011.06.006. Epub 2011 Jul 20.
This study was conducted in vivo to investigate the accuracy of Root ZX II in locating the apical foramen in teeth with apical periodontitis (AP).
Twenty-seven single-root teeth scheduled for extractions were selected; in AP group, there were 12 teeth with pulp necrosis and radiographic evidence of apical lesions, and VT group consisted of 15 vital teeth. After endodontic access, the coronal portion of the canal was flared, and electronic measurement was performed by using a 15 K-file until the device level reading "APEX" was reached. The file was fixed in place, and the tooth was extracted. The apical third of the root was shaved until exposure of the file. The distance from the file tip to the most coronal border of the apical foramen was obtained.
The mean distance in AP group was +0.117 (standard deviation, 0.373) and in VT group was -0.105 (standard deviation, 0.218). The unpaired t test showed no difference between the groups when comparing the mean distances (P > .05). The apical foramen was accurately located within ±0.5 mm in 83% of the teeth in AP group and in 100% of VT group. Statistical analysis showed no difference between the groups (P = .1092).
The Root ZX II device was accurate in locating the apical foramen regardless of the presence of AP.
本研究通过体内实验，旨在探究 Root ZX II 在定位伴有根尖周炎（AP）的牙齿根尖孔时的准确性。
选择 27 颗拟行拔除的单根牙；AP 组中，有 12 颗牙髓坏死且影像学显示根尖病变的牙齿，VT 组包括 15 颗活髓牙。进行根管口预备后，根管冠部扩锉，使用 15 K 锉进行电子测量，直至器械读数达到“APEX”。将锉固定在适当位置，然后将牙齿拔出。刮除根尖 3 分之一，直至露出锉。测量从锉尖到根尖孔最冠方边缘的距离。
AP 组的平均距离为+0.117（标准差，0.373），VT 组为-0.105（标准差，0.218）。当比较两组的平均距离时，配对 t 检验显示两组之间无差异（P >.05）。在 AP 组中，83%的牙齿根尖孔定位准确在±0.5mm 以内，VT 组中则为 100%。统计学分析显示两组之间无差异（P =.1092）。
无论是否存在 AP，Root ZX II 器械都能准确地定位根尖孔。
