Comparison on the effect of two bleaching agents on tooth resistance after pulp chamber bleaching
Objective To compare the effect of hydrogen peroxide(HP)and sodium perborate(SP)on tooth resistance after pulp chamber bleaching.Methods 40 intact premolars were treated with root canal therapy and randomly divided into HP group,SP group,SP+HP group,control group,with 10 premolars in each group.The control group was given water treatment,HP group was given hydrogen peroxide treatment,SP group was given sodium perborate treatment,and SP+HP group was treated with hydrogen peroxide and sodium perborate treatment.The four groups of teeth were built with three-dimensional external pulp chamber bleaching model,and finally placed on the universal testing machine to test the maximum load,record the maximum bearing pressure of each sample,and compare the resistance value of the four groups.Results The tooth resistance value of HP group,SP group and HP+SP group were(868.37±94.47),(796.07±32.88)and(1072.09±56.34)N,respectively,which were lower than that of(1244.17±98.40)N of control group,and the difference was statistically significant(P<0.05).There was no statistically significant difference in tooth resistance value between HP group and SP group(P>0.05).The tooth resistance value of HP+SP group was higher than that of HP group and SP group,and the difference was statistically significant(P<0.05).Conclusion Hydrogen peroxide and sodium perborate used in pulp chamber bleaching can reduce tooth resistance,especially sodium perborate.But the combination of the two has a smaller impact on tooth resistance.
NETL
NSTL
万方数据
维普
