【摘要】 背景:桩道超声清洗可提高自粘接树脂水门粘接纤维桩的粘接强度,但其对桩道根管根尖封闭的影响尚不明了。目的:探讨桩道超声清洗在两种剩余根管充填物长度时,对两种根管封闭剂根尖微渗漏的影响。方法:将80颗离体人上颌单根管前牙随机分为A、B两组,每组40颗,根管充填时分别使用Cortisomol和AH-Plus根管封闭剂,依据桩道预备后剩余根管充填物长度和是否进行桩道超声清洗,两组各随机分为4个亚组(n=10):A1、B1组,剩余5 mm、不行超声清洗;A2、B2组,剩余5 mm、超声清洗;A3、B3组,剩余3 mm、不行超声清洗;A4、B4组,剩余3 mm、超声清洗。按照分组对标本进行处理后,使用染料渗透法和透明标本技术在体视显微镜下测量根尖微渗漏。结果与结论:A1-A4组根尖微渗漏分别为(0.73±0.21),(1.37±0.55),(1.18±0.36),(2.05±0.62)mm,B1-B4组分别为(0.34±0.18),(0.47±0.14),(0.59±0.23),(1.39±0.50)mm。三因素方差分析显示,超声清洗、根管封闭剂、剩余根管充填物长度均可影响根尖微渗漏(P<0.05);A1和A2组、A3和A4组、B3和B4组、A2和A4组、B2和B4组间根尖微渗漏比较差异有显著性意义(P<0.05)。结果表明,使用Cortisomol根管封闭剂在剩余根管充填物长度为5,3 mm时,使用AH-Plus根管封闭剂在剩余根管充填物长度为3 mm时,超声清洗可使根尖微渗漏增大;对于同一种根管封闭剂,剩余根管充填物长度较长时,超声清洗后的根尖微渗漏较小。更多还原

【Abstract】 BACKGROUND: The post space cleaning using ultrasonic file can improve the bonding strength of fiber posts cemented with the self-adhesive resin cement, but the effect on apical sealing ability is still unclear. OBJECTIVE: To evaluate the effect of the post space cleaning using ultrasonic file on apical microleakage following treatment with two kinds of root canal sealers at two different residual lengths of root canal filling. METHODS: Eighty extracted human maxillary anterior teeth with single-rooted canal were selected, and equivalently randomized into groups A and B(n=40 per group), followed by filled with Cortisomol or AH-plus, respectively. Groups A and B were randomly subdivided into four groups according to the residual length of root canal filling and with or without ultrasonic cleaning(n=10 per group): A1, B1 groups: residual 5 mm, no ultrasonic cleaning; A2, B2 groups: residual 5 mm, ultrasonic cleaning; A3, B3 groups: residual 3 mm, no ultrasonic cleaning; A4, B4 groups: residual 3 mm, ultrasonic cleaning. Subsequently, the apical microleakage was measured using dye method and transparent specimen technique under stereomicroscope. RESULTS AND CONCLUSION: The apical microleakage of each group was as follows: A1(0.73±0.21) mm, A2(1.37±0.55) mm, A3(1.18±0.36) mm, A4(2.05±0.62) mm, B1(0.34±0.18) mm, B2(0.47±0.14) mm, B3(0.59±0.23) mm, B4(1.39±0.50) mm. The three-factor analysis of variance revealed that the ultrasonic cleaning, root canal sealers and residual length of root canal filling all had a significant effects on the apical microleakage(P < 0.05), and there were significant differences in the apical microleakage between groups A1 and A2, groups A3 and A4, groups B3 and B4, groups A2 and A4, groups B2 and B4(P < 0.05). These results indicate that the ultrasonic cleaning increases the apical microleakage following the use of Cortisomol at 5 and 3 mm residual length, as well as the use of AH-Plus at 3 mm residual length. Moreover, for the same root canal sealer, the longer residual length of root canal filling indicates, the less microleakage after ultrasonic cleaning.更多还原