不同方法去除根管内氢氧化钙封药的体外研究

Removal of calcium hydroxide from root canals by different methods: an in vitro study

目的:研究不同方法去除直根管和弯曲根管内氢氧化钙封药的差异。方法:建立直根管、弯曲根管的体外标准化模型,用根管锉、超声冲洗器械、EndoActivator配合注射器冲洗去除根管内氢氧化钙封药,随后打开模型,体视显微镜下拍照,软件测量,计算氢氧化钙残余量并进行统计分析。结果:不同方法去除氢氧化钙能力:直根管中K锉≈EndoActivator≈P5>直接冲洗;弯曲根管中EndoActivator≈预弯P5>P5>预弯K锉>K锉>直接冲洗。弯曲根管与直根管之间,K锉组、P5组、EndoActivaor组之间均有显著差异(P<0.05)。结论:3种方法均不能完全去除根管内氢氧化钙,EndoActivaor是去除根管内氢氧化钙的较好方法。

AIM：To compare the efficacy of different techniques in the removal of calcium hydroxide〔Ca （OH）2〕in straight and curved root canals.METHODS：The straight and curved root canal models were established using extracted tooth roots.K file,ultrasonic and EndoActivator were respectively used for the removal of Ca（OH）2 （n=10）.The residual Ca（OH）2 was observed by stereomicroscope,the percentage of residual Ca（OH）2 was analyzed and calculated using the photographs taken by camera attached to stereomicroscope.RESULTS：In straight root canal models,the Ca（OH）2 removal efficacy was in the following order：EndoActivator≈P5 ≈asmall K file 〉irrigation;while in curved root canal models,EndoActivator≈precurved P5 〉P 〉pre-curved small K file〉small K file〉irriga-tion.The percentage of residual Ca（OH）2 in the curved canals was higher than that in straight canals （P〈0.05 ）. CONCLUSION：EndoActivaor is the most effective for Ca（OH）2 removal.But none of methods used can completely remove Ca（OH）2 in root canal.