摘要
目的:评估酸蚀处理倒预备洞型对根尖倒充填材料封闭性能的影响。方法:选用80颗新鲜拔除的下颌磨牙,使用3.5倍放大镜检查,排除牙根隐裂,清洁干净后保存于蒸馏水中备用,截取其远中根,行根管治疗。根管预备使用旋转镍钛器械,根管充填采用冷侧压法。根管治疗后牙根截去根尖3 mm,使用超声尖倒预备(3 mm深)。倒预备后牙根随机分成4组,分别使用银汞、临时充填材料(intermediate restorative material,IRM)、新型根尖倒充填材料iRoot BP Plus和三氧化矿物凝聚体(mineral trioxide aggregate,MTA)4种材料倒充填。每组再根据倒预备洞型行酸蚀处理与否分为酸蚀组和非酸蚀组两个亚组,每组10颗牙。牙根倒充填后使用藻酸盐印膜材覆盖根尖,保存在PBS溶液中1周,待其固化,使用亚甲基蓝染色1周,取出纵行劈开,在体视显微镜下观察微渗漏。统计学分析采用单因素方差分析和Tamhane’s T2法,α值设为0.05。结果:各组渗漏值为:银汞酸蚀(2.80±0.72)mm,银汞不酸蚀(2.07±0.86)mm,IRM酸蚀(1.54±0.19)mm,IRM不酸蚀(1.12±0.28)mm,iRoot BP Plus酸蚀(0.20±0.20)mm,iRoot BP Plus不酸蚀(0.11±0.08)mm,MTA酸蚀(0.19±0.19)mm,MTA不酸蚀(0.17±0.14)mm。单因素方差分析显示不同组渗漏差异有统计学意义。Tamhane’s T2法组间比较显示:iRoot BP Plus组和MTA组渗漏显著小于银汞和IRM组(P<0.05);iRoot BP Plus组和MTA组渗漏无显著差别;酸蚀会增加IRM的渗漏性(P<0.05);酸蚀对MTA、iRoot BP Plus和银汞的渗漏性无显著影响。结论:酸蚀处理不能改进根尖倒充填材料的封闭性。
Objective： To evaluate the effect o f acid etching o f retropreps on seal o f d iffe re nt re t ro f i l l materials. Methods： In the study, 80 freshly extracted lower molar teeth were used. They were examined under 3. 5 x magnifying glass to rul l out fractures. They were cleaned and stored in d is t i l le d water before use. The distal roots were sectioned o f f and underwent root canal treatment. Rotary n ic k e l- t ita n ium in -struments were used dur ing instrumentation and the roots were obturated using lateral condensation tech-nique. The apical portion （3 mm in le n g th） was removed w i th a f in e g r i t diamond b u r, the root t ip was retroprepared wi th a ultrasonic t ip （ 3 mm in d e p th） . The retroprepared roots were randomly assigned to 4 groups and retrofi lled wi th amalgam, intermediate restorative material （IR M ） , iRoot BP Plus and mineral trioxide aggregate （ MTA ）. The groups were fu r th e r div ide d into subgroups according to treatment o f the root end cavity （etch and non- etch ）. The root tips were covered w ith alginate impression material and were left to set in PBS solution fo r a week and stained w i th methylene blue fo r a week. The roots were re-moved from the dye solut ion, thoroughly rinsed and d r ie d , s p l it in halves along the long axis w ith a d ia-mond disk and observed under a stereoscope. The l in e a r dye leakage was measured and analyzed. One way ANOVA and Tamhane ^ s T2 method were used to analyze the data. The significance level was set at 0. 05. Results： The dye leakage results （ mean 士 standard d e v ia t io n） according to the treatment groups were： amalgam etch （2. 80 ± 0. 72 ） mm , amalgam non-etch （ 2. 07 ± 0. 86 ） m m , IRM etch （ 1 . 54 士 0. 19） mm , IRM non-etch （1. 12 ±0.28; mm , iRoot BP Plus etch （0.20 ±0.20） m m , iRoot BP Plus non-etch （0. 11 ±0. 08） mm , MTA etch （0. 19 ±0. 19） mm , and M TA non-etch （0. 17 ±0. 14） mm.One way ANOVA showed s ignif icant differences between the groups. Comparison between the groups using Tamhane,s T2 method showed roots re tro f i l le d w i th iRoot BP Plus and MTA had s ig nif ica nt less leakage than those retrof i l led wi th amalgam and IRM （ P 〈0.05） ; There was no s ig nif ica nt difference in terms of leakage between iRoot BP Plus and MTA ; A c id etching increased leakage o f IR M but d id not affect MTA , iRoot BP Plus or amalgam re t ro f i l l in g s. Conclusion： A c id etching is not shown to benefitapical sealing of retrofi l l materials.
作者
谢克贤
黎远皋
张平
王霄
XIE Ke-xian;LI Yuan-gao;ZHANG Ping;WANG Xiao(Department of Stomatology, Peking University Third Hospital, Beijing 100191 , China)
出处
《北京大学学报（医学版）》
CAS
CSCD
北大核心
2018年第1期69-72,共4页
Journal of Peking University:Health Sciences
关键词
根尖手术
倒充填材料
根尖封闭性
渗漏
线性染料
Apical surgery
Retrof i l l ma te r ia l
A p ic a l sea l
Leakage, l in e a r dye
