Effect of ultrasonic cleaning of post space on the apical microleakage following treatment with two kinds of root canal sealers / 中国组织工程研究

ABSTRACT

BACKGROUND:The post space cleaning using ultrasonic file can improve the bonding strength of fiber postscemented with the self-adhesive resin cement, but the effect on apical sealing ability is stil unclear. OBJECTIVE:To evaluate the effect of the post space cleaning using ultrasonic file on apical microleakage fol owing treatment with two kinds of root canal sealers at two different residual lengths of root canal fil ing. METHODS:Eighty extracted human maxil ary anterior teeth with single-rooted canal were selected, and equivalently randomized into groups A and B (n=40 per group), fol owed by fil ed with Cortisomol or AH-plus, respectively. Groups A and B were randomly subdivided into four groups according to the residual length of root canal fil ing and with or without ultrasonic cleaning (n=10 per group)A1, B1 groupsresidual 5 mm, no ultrasonic cleaning;A2, B2 groupsresidual 5 mm, ultrasonic cleaning;A3, B3 groupsresidual 3 mm, no ultrasonic cleaning;A4, B4 groupsresidual 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 fol owsA1 (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 fil ing al 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 fol owing the use of Cortisomol at 5 and 3 mm residual length, as wel 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 fil ing indicates, the less microleakage after ultrasonic cleaning.