Dilinaer Kurexi, Yang Ya, He Hong
Department of General Dentistry, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology; Shanghai Research Institute of Stomatology. Shanghai 200011, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2024 Jun;33(3):250-254.
To investigate the effect of GuttaFlow Bioseal root canal sealer on the vertical root fracture resistance of oval-shaped root canals.
Sixty orthodontically subtracted maxillary and mandibular single-rooted premolar teeth were scanned with CBCT. Oval canals were eligible when the buccolingual diameter of the canal was greater than or equal to two times the mesiodistal diameter at a distance of 5 mm from the root apex. Thirty single-rooted premolars with oval-shaped root canals were prepared to F2 using the Protaper system and then randomly divided into the GuttaFlow Bioseal filling group and iRoot SP filling group. Each group was further divided for root canal filling using warm vertical compression, cold lateral condensation and single cone techniques. Five single-rooted premolars was chosen as a negative control group. After 30 days of storage in a constant thermotank at 37 ℃ and 100% humidity, the filled roots were vertically placed into a cylindrical model of self-polymerizing acrylic resin. Subsequently, the samples were fixed on the lower plate of a universal testing machine, and a ball of 4 mm in diameter was applied vertically with a downward pressure at a speed of 1 mm/min until fracture occurred. The load values were recorded in Newtons. The data were analyzed using SPSS 29.0 software package. Fracture patterns were examined under microscope.
T test results showed no significant difference between the GuttaFlow Bioseal-filled and iRoot SP-filled groups (P=0.321). One-way ANOVA showed a significant difference in vertical fracture resistance between the groups(P＜0.05), and LSD analysis showed that the GuttaFlow Bioseal-filled sample teeth were significantly more resistant to vertical fracture than the iRoot SP when using the thermal vertical compression filling method and the single-tip method(P＜0.05). In contrast, the GuttaFlow BIoseal-filled group was significantly less resistant to vertical fracture than the iRoot SP group when using the cold lateral compression filling method(P＜0.05).
GuttaFlow Bioseal has the potential to improve root resistance to vertical fracture when filling root canals using the thermal vertical pressurization method and the single-tip method, but more clinical trials are needed to validate this result and its long-term prognosis.
研究GuttaFlow Bioseal根管封闭剂对椭圆形根管垂直抗折性能的影响。
采用锥形束计算机断层扫描（CBCT）对60颗正畸减数拔除的上颌和下颌单根前磨牙进行扫描。当根管的颊舌径在距根尖5mm处大于或等于近远中径的两倍时，椭圆形根管符合条件。使用Protaper系统将30颗具有椭圆形根管的单根前磨牙预备至F2，然后随机分为GuttaFlow Bioseal充填组和iRoot SP充填组。每组再进一步分为采用热垂直加压、冷侧向加压和单锥技术进行根管充填。选取5颗单根前磨牙作为阴性对照组。在37℃、湿度100%的恒温水箱中储存30天后，将充填后的牙根垂直放入自凝丙烯酸树脂的圆柱形模型中。随后，将样本固定在万能试验机的下板上，以1mm/min的速度垂直向下施加一个直径为4mm的球直至发生骨折。载荷值以牛顿为单位记录。使用SPSS 29.0软件包对数据进行分析。在显微镜下检查骨折类型。
t检验结果显示，GuttaFlow Bioseal充填组和iRoot SP充填组之间无显著差异（P=0.321）。单因素方差分析显示各组之间垂直抗折性能存在显著差异（P＜0.05），最小显著差法（LSD）分析显示，采用热垂直加压充填法和单尖法时，GuttaFlow Bioseal充填的样本牙垂直抗折能力明显高于iRoot SP（P＜0.05）。相比之下，采用冷侧向加压充填法时，GuttaFlow Bioseal充填组的垂直抗折能力明显低于iRoot SP组（P＜0.05）。
当采用热垂直加压法和单尖法充填根管时，GuttaFlow Bioseal有提高牙根垂直抗折能力的潜力，但需要更多的临床试验来验证这一结果及其长期预后。
