Er,Cr:YSGG激光预处理对桩道牙本质粘接强度的影响研究
2019-06-09邓敏陈海波何钢清李佳俞
邓敏 陈海波 何钢清 李佳俞
【摘要】 目的 探讨Er,Cr:YSGG激光预处理桩道牙本质表面对其与纤维桩粘接强度的影响,为临床选择合适的根管表面处理方法提供实验依据。方法 选用45颗因正畸拔除的健康下颌单根管前磨牙经根管治疗、桩道预备后随机分为三个组,每组15颗。使用不同方法对桩道牙本质壁进行处理,Ⅰ组(对照组):常规单纯酸蚀表面处理组;Ⅱ组:Er,Cr:YSGG激光表面处理组;Ⅲ组:Er,Cr:YSGG激光联合酸蚀处理组。分别用树脂水门汀将纤维桩粘接于根管桩道内,用力学试验机以1 mm/min速度牵拉纤维桩,记录纤维桩与牙根脱离时的最大载荷,并进行统计学分析。结果 三种不同处理方法对桩道牙本质粘接强度的影响差异有统计学意义(P<0.001),Ⅱ组的粘接强度显著高于Ⅰ组和Ⅲ组,差异有统计学意义(P<0.001)。
结论 Er,Cr:YSGG激光预处理技术的应用能提高根管牙本质的粘接强度。
【關键词】 Er,Cr:YSGG激光;桩道;纤维桩;粘接强度
中图分类号:R783.1 文献标志码:A DOI:10.3969/j.issn.1003-1383.2019.03.005
【Abstract】 Objective To study Er,Cr:YSGG laser pretreatments for the surface of post space dentin and its effect on bonding strength between fiber post and dentin.Methods After root canal therapy and post space preparation,45 healthy extracted mandible premolar teeth with single root canal were randomly divided into three groups,with 15 teeth in each group.Different methods were used to treat the dentin wall of post space—Group Ⅰ(control group) were given conventional acid etching surface treatment,GroupⅡwere given Er,Cr:YSGG laser surface treatment,and Group Ⅲ were given Er,Cr:YSGG laser combined with acid etching treatment.Fiber posts were cemented in root canal with resin cement,and then fiber posts were pulled by mechanical testing machine at 1 mm/min speed.And then,maximum load when the fiber post detached from tooth root was recorded,and statistical analysis was carried out.Results There was statistically significant difference in the effects of the three different processing methods on bonding strength of post space dentin(P<0.001),and the bonding strength of the GroupⅡwas higher than that of the Group Ⅰ and Group Ⅲ,difference was statistically significant(P<0.001).
Conclusion Er,Cr:YSGG laser pretreatment technique can increase the bonding strength of post space dentin.
【Key words】 Er,Cr:YSGG laser;post space;fiber post;bonding strength
随着美容修复需求的日益增长以及现代保存牙科学的发展,纤维桩逐渐取代传统的金属桩。纤维桩能否与根管获得牢固的粘接是关系到修复成功与否的关键。研究发现[1~2],纤维桩粘接失败主要发生在牙本质-粘接剂界面。因此,寻找有效方法对根管壁牙本质的表面进行处理,加强粘接剂与根管壁间的粘接效果,从而提高纤维桩的最终粘接强度具有非常重要的意义。自激光问世以来,Er,Cr:YSGG激光在粘接前预处理中的应用发展迅速。但是Er,Cr:YSGG激光预处理根管壁表面对其与纤维桩的粘接强度影响的研究目前较少报道。本研究旨在探讨应用Er,Cr:YSGG激光预处理对根管牙本质粘接强度的影响,为临床选择合适的根管表面处理方法提供实验依据。
1 资料与方法
1.1 材料与仪器
Er,Cr:YSGG Waterlaser(Biolase,美国);Aestheti-Plus玻璃纤维桩(美国BISCO公司)、Zwick/Z万能材料试验机(德国Zwick公司),全酸蚀型粘接树脂(美国BISCO公司),根管封闭剂AH- Plus Sealer(Dentsply,德国)。