Effect of riming of post space preparation on the apical seal of root canals filling with different obtu-ration materials

LIU Yang-yang

Abstract：Objective:To explore the characteratics of apical sealing between filling Material of root canal and the effect of different tiMe of post space preparation on the capbility between filling Materals of root canal,and to provide the reference for choosing a More reasonable root filling Material and tiMe of post space preparation in clinical. Methods:60 front teeth were cut crown and randoMly divided into two groups,A(CortisoMol cataplasM ﹢ tooth rubber tip)and B(new resin Realseal root ca-nal filling systeM),each group of 30. Lateral pressure Method was perforMed to fill root canal. 30 front teeth in A/ B group were randoMly divided into three groups respectively:no post space preparation(A1 ,B1 ),iMMediate post space preparation(A2 , B2 ),delayed post space preparation(A3 ,B3 ),each group of ten. Seal root canal orifice with zinc phosphate ceMent and stain for 7 days in the ink. Results:There was a significant difference in Micro leakage values between A1 and B1(P ﹤ 0. 05). SiMilar result appeared between A3 and A1(P ﹤ 0. 05). However,no significant difference in Micro leakage value was detected between A2 and A1(P ﹥ 0. 05),B1 and B2(P ﹥ 0. 05),B3 and B1(P ﹥ 0. 05). Conclusion:There was different characteratic of apical sealing between filling Material of root canal,of which the sealing capbility of Realseal root canal filling was better. After root canal filling with CortisoMol paste line ﹢ the teeth,iMMediate pile prepare had no significant effect on the apical sealing abili-ty of tao,while delay pile prepare reduced the apical sealing ability. After root canal filling with Realseal line canal filling sys-teM,the iMMediate pile and the delayed pile had no effect on the apical sealing ability.