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[Experimental study of preparation errors during instrumentation of artificial curved root canals with stainless
Pei-gang Zhou1, Yong-chun Gu, Yue-feng Ding
1Department of Stomatology, First People's Hospital of Wujiang, Wujiang 215200, Jiangsu Province, China.
Purpose:
To investigate the features and rules of preparation errors developed from instrumentation of curved root canals.
Methods:
8 curved artificial root canals were prepared with stainless steel K files by the step-back technique,the root canals were digitally photographed,the images were analysed by the software Image-Pro Plus,the shapes and positions of the root canals were measured and analysed.SPSS 10.0 software package was used for statistical analysis, paired-samples t test was used to compare the difference of the means among sample groups.
Results:
After root canal preparation,the mean value of the angles of canal curvature decreased from 36.21 degrees to 21.98 degrees , while the mean value of the radius of the canal curvature increased from 6.25mm to 11.35mm; the canal axes transported and intercrossed with the original axes at 2 points and created 3 intersection zones.The taper of the root canals was destroyed and a series of instrumentation defaults were created.
Conclusion:
The cause of preparation errors was the transportation of the root canal instruments leaded by the elastic force and cutting effects.