iRoot BP Plus不同充填方式对根尖手术中根管封闭性能影响的体外研究

In vitro study of the effect of different filling methods of iRoot BP Plus on the sealing performance of root canal during apical surgery

目的:通过体外研究分析iRoot BP Plus不同充填方式对根尖手术中根管封闭性能的影响。方法:将符合入选标准的60颗新鲜拔除的下颌第一前磨牙,随机分为A、B、C 3组,各20颗。A组iRoot BP Plus正充填后行根尖切除术,B组常规根管治疗(AH Plus糊剂及热牙胶充填)后行根尖切除术,根尖倒预备与iRoot BP Plus倒充填,C组常规根管治疗后行根尖切除;A、C组不进行根管倒充填。采用染料渗漏法分析3组根管封闭性,扫描电镜观察材料与根管间界面的密合性及结构特点。结果:3组样本均有不同程度的染料渗透,且渗透平均长度存在差异(P<0.05),A、B组染料渗透平均长度均短于C组(P<0.05),但A、B组平均长度无明显差异(P>0.05)。扫描电镜发现A、B组iRoot BP Plus与牙本质间结合紧密,C组牙胶与牙本质间存在明显裂隙。结论:iRoot BP Plus正充填后根尖切除和常规根管治疗后iRoot BP Plus倒充填的iRoot BP Plus材料都可与牙本质紧密结合,两者根尖封闭效果相似。

Objective:To analyze the effect of different filling methods of iRoot BP Plus on the sealing performance of root canal during apical surgery in vitro.Methods:Sixty freshly extracted mandibular first premolars meeting the inclusion criteria were randomly divided into three groups A,B and C with 20 teeth in each group.Group A underwent apicectomy after iRoot BP Plus positive filling,group B underwent apicectomy and iRoot BP Plus backfilling after conventional root canal therapy,and group C underwent apicectomy after conventional root canal therapy without root canal backfilling.The sealing property of the root canal of the three groups was analyzed qualitatively and quantitatively by dye leakage method.The adhesion and structural characteristics of the interface between the material and the root canal were observed by scanning electron microscopy.Results:The three groups all had different degrees of dye penetration,and the average length of dye penetration was different(P<0.05).The average length of dye penetration in groups A and B was shorter than that in group C(P<0.05),but there was no significant difference in the average length of dye penetration in groups A and B(P>0.05).Scanning electron microscopy showed that iRoot BP Plus and dentin in groups A and B binded tightly and there were obvious cracks in group C.Conclusion:Both iRoot BP Plus materials with apicectomy after positive filling and iRoot BP Plus backfilling after conventional root canal treatment can be closely combined with dentin,and the apicectomy effect of both materials is similar.Therefore,apicectomy after iRoot BP Plus positive filling has certain clinical application value.