Haïkel Y, Freymann M, Fanti V, Claisse A, Poumier F, Watson M
Université Louis Pasteur, Inserm U-424, Faulté de Chirurgie Dentaire, 1 Place de l'Hôpital, 67000 Strasbourg, France.
J Endod. 2000 Mar;26(3):148-52. doi: 10.1097/00004770-200003000-00005.
The three methods of obturation assessed in this study were lateral condensation (80 teeth), Thermafil (40 teeth), and McSpadden (40 teeth). All teeth were prepared to the master apical file 30 and widened coronally by Gates Glidden burs before being randomly assigned to experimental groups to be filled by each technique; they were then sealed with nail polish, except for the apical 1 mm. Quantitative evaluation of apical microleakage for each technique was obtained after periods of 1 day, 7 days, 14 days, and 28 days of immersion in a lysozyme solution labeled with radioactive iodine by preparing horizontal sections of the teeth and measuring the level of radioactivity in each section using a gamma counter. Initial (1-day) leakage was least in the Thermafil group and was significantly different from the other techniques. Leakage was greatest in the laterally condensed samples. By the end of the study (28th day) values for lateral condensation were lowest, but were significantly different only for the McSpadden group. For all techniques leakage was most significant in the first 3 mm from the apex and was very low below this level so that all methods can be considered as giving a hermetic seal below 3 mm.
本研究评估的三种根管充填方法分别为侧方加压充填法（80颗牙）、热牙胶充填法（Thermafil，40颗牙）和麦克史帕登法（McSpadden，40颗牙）。所有牙齿均预备至主尖锉30号，并在使用盖茨·格利登钻针进行冠部扩宽后，随机分配至各实验组，采用相应技术进行充填；除根尖1mm外，其余部分均用指甲油密封。在将牙齿浸泡于标记有放射性碘的溶菌酶溶液中1天、7天、14天和28天后，通过制备牙齿的水平切片并使用γ计数器测量各切片的放射性水平，对每种技术的根尖微渗漏进行定量评估。初始（1天）渗漏在热牙胶充填组中最少，且与其他技术有显著差异。侧方加压充填样本的渗漏最大。到研究结束时（第28天），侧方加压充填法的数值最低，但仅与麦克史帕登组有显著差异。对于所有技术，在距根尖前3mm处渗漏最为显著，在此水平以下渗漏非常低，因此所有方法均可视为在3mm以下形成了密闭性封闭。
