两种热塑牙胶充填技术与冷侧压法根管充填效果的比较

Two thermoplasticized gutta-percha filling techniques and cold lateral condensation: a comparison of root filling results

目的:比较2种热塑牙胶充填技术(Ultrafil 3D和ObturaⅡ)与冷牙胶侧方加压法充填根管的效果。方法:收集完整上颌前牙60颗,随机分成3组,每组20颗,常规制备根管,分别用Ultrafil 3D、ObturaⅡ和冷牙胶侧方加压法进行根管充填,并记录充填时间。3 d后,每组随机选10颗牙,染色后测量微渗漏长度;每组另10颗牙以扫描电镜测量根管壁与牙胶间微缝隙宽度。结果:充填时间以冷牙胶侧方加压法最长,ObturaⅡ次之,Ultrafil 3D最短;冷侧压法与其余两组热塑牙胶注射加压法之间存在显著差异(P<0.01);微渗漏及微缝隙在冷牙胶侧方加压法与两组热塑牙胶注射加压法之间也存在显著差异(P<0.05),而两组热塑牙胶注射加压法间却无明显差别。结论:在离体实验条件下,热塑牙胶注射加压与冷牙胶侧方加压充填相比,具有较好的根管壁适应性和密合度,且充填速度较快。

Objective：To compare the root filling results of 2 thermoplasticized gutta-percha filling techniques （Ultrafil 3D and Obtura Ⅱ ） with cold lateral condensation of gutta-percha. Methods： Sixty freshly extracted maxillary mandibular single- rooted teeth were instrumented and randomly divided into 3 groups： Ultrafil 3D, Obtura Ⅱ and cold lateral condensation groups. The root canal was routinely prepared and the obturation time was recorded. Three days later, 10 teeth of each group were ran- domly stained and the micro effusion length was subsequently measured. The micro-chink between filling materials and the wall of root canal were measured with scanning electron microscope in the other 10 teeth of each group. The data were analyzed using unpaired Student＇s t-test. Results： The longest obturation time was in cold lateral condensation group, then Obtura Ⅱ and Ultrafil 3D group in order, with significant difference found between the cold lateral condensation group and the latter 2 groups （P〈0.01）. The lengths of micro effusion and micro-chink in lateral condensation group were significantly larger than those in the other 2 groups （P〈0.05） ; however, there was no significant difference between the 2 injection thermoplasticized gutta-percha technique groups. Conclusion： Under in vitro condition, the 2 injection thermoplasticized gutta-percha techniques have better adaptation to the canal wall, better root filling results, and less obturation time compared with cold lateral condensation.