连续波热塑充填和冷牙胶侧压充填根尖封闭效果的比较研究

An in vitro comparison study on sealing ability of continuous-wave condensation method and cold lateral condensation method

目的:比较连续波热塑充填和冷牙胶侧压充填的根尖封闭效果。方法:收集完整离体单根管恒牙44个,统一用ProTaper预备,随机分为A,B两组,每组20个牙,另4个分别为阳性和阴性对照组。A组用E&QPlus热牙胶充填系统做连续波热塑充填,B组用冷牙胶侧压充填法。染料渗透法染色后测量根尖微渗漏长度;扫描电镜观测根管壁与充填物间微缝隙宽度。结果:A组根尖微渗漏长度均值为(1.26±0.44)mm,微缝隙均值为(2.87±1.07)μm;B组根尖微渗漏长度均值为(2.35±0.67)mm,微缝隙均值为(5.80±0.74)μm。微渗漏和微缝隙在连续波热塑充填和冷牙胶侧方加压法充填之间存在显著性差异(P<0.05)。结论:在离体实验条件下,连续波热塑充填具有较好的根管壁适应性和密合度,充填效果优于冷牙胶侧压充填方法。

AIM： To compare the apical sealing ability of continuous -wave technique with cold lateral condensation of gutta - percha. METHODS ： Forty - four intact extracted human single - root teeth were selected, root canals were instrumented using the ProTaper Nickel - Titanium hand -files. The samples were randomly divided into A and B groups. Group A was obturated with E＆Q plus system, Group B was obturated with the cold lateral condensation of gutta - percha. Dyeing lines were measured to reflect the micro - leakage of different obturated materials. Micro - chink between root canal and the fillings was measured under SEM. RESULTS ： Apical micro - leakage lines of group A had mean length of （ 1.26 ±0.44） mm ; micro - chink of group A had mean length of （2.87± 1.07 ） μm. Apical micro - leakage lines of group B had mean length of （2.35±0.67 ） mm; micro - chink of group B had mean length of （ 5.80 ±0.74） μm. Microleakage and micro - chink were significantly different between E＆Qplus system and cold lateral condensation of gutta - percha（ P 〈 0.05 ）. CONCLUSION： Under in vitro condition, the continuous - wave ondensation with thermoplasticized gutta -percha adapts better to the canal wall, showing better root canal sealing ability.