A comparative study of the standardization of three different brands of gutta-percha points
AIM:To verify whether the apical diameters and tapers of three brands of gutta-percha points commonly used in clinical practice meet ISO standards.METHODS:The size of tip diameter(D0)(n=100)was evaluated using a GUTTA-PERCHA GAUGE or China Liuyuan(Group A),China Sungwoo(Group B),and Korean Sure-endo(Group C)2504 and 3504 models(n=100);the taper size was then assessed using a resin root canal model prepared with standard rotary files.The percentage of the number of samples in each group whose D0 was large,small and conformed to the ISO standard and the percentage of samples whose taper also conformed were calculated.Data were analyzed using chi2 test with a significance level of 0.05.RESULTS:51.7％of the gutta-percha points conformity with ISO,40.3％were smaller than expected,and 8.0％were larger than expected.In group A 68％conformity,12％were small and 20％were large,in group B 36％conformity,60％were small and 4％were large,and in group C 49％conformity,51％were small and 0％were large.In 2504,group B more in line with the standard(P=0.0004).In 3504,group A more in line with the standard is(P＜0.0001).The taper standardized samples ranged from 0％to 34.4％of the D0 standardized number,and there were no samples in Group C that met both D0 and taper standards.CONCLUSION:None of the three brands of dental cementum tips in this experiment met the ISO standard for D0 and taper,However,Sure-endo and Liuyuan brands were comparatively more compliant in the 2504 and 3504 models,respectively.
NETL
NSTL
万方数据
