不同根管封闭剂结合单尖法封闭椭圆形根管欠预备最大长度限度的研究OA

Objective To investigate the impact of iRoot SP and iMTA SP bioceramic root canal sealers combined with the single-cone technique on the filling length of oval root canals with insufficient mechanical preparation,and assess their clinical value.Methods A total of 100 extracted premolars were randomly divid-ed into four groups with 0,2,4,and 6 mm of insufficient preparation.Each group was further divided into three subgroups.The control group(AH Plus)had 5 specimens,while the iRoot SP and iMTA SP groups each had 10 specimens.For specimens sealed with iRoot SP and iMTA SP,the single-cone technique was used for obturation.The underfilling length after obturation was compared among all groups.Results In the 0 mm and 2 mm underprepared length groups,the rate of optimal filling was 100.0%for all three sealers.However,when the underprepared length exceeded 2 mm,When the underprepared length exceeded 2 mm,the optimal filling rate in the AH Plus group dropped to 0;in the 4 mm underprepared length group,the iMTA SP group achieved an optimal filling rate of 100.0%,which was higher than that of the iRoot SP group(90.0%).In the 6 mm underprepared length group,the underfilling length in the iMTA SP group was significantly shorter than that in the iRoot SP group,and the difference was statistically significant(P<0.05).The optimal filling rate in the iMTA SP group was 80.0%,which was higher than that in the iRoot SP group(40.0%).Within the iRoot SP group,significant differences in underfilling length were observed only between the 6 mm under-prepared length group and the 0 mm and 2 mm groups(P<0.05),while no significant differences were found among the other subgroups(P>0.05).Conclusion When mechanical preparation is underprepared,iRoot SP is suitable for oval-shaped root canals with underpreparation lengths within 4 mm,while iMTA SP has a broa-der application range,extending to underpreparation lengths up to 6 mm.