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In vitra evaluation:the influence of dentin scraping at apical foramen on the accuracy of Root ZX.

CHEN Wei-min,LI Hao-yan,LIANG Jing-ping.Department of Endodontics,School of Stomatology,Ninth People's Hospital,Shanghai Jiaotong University School of Medicine,Shanghai Key Laboratory of Stomatology.Shanghai 200011,China  
Objective:Compared the root length measured by Root zx before root canal prepared and after root canal prepared and after cleaning the scraping from tip of root canal.Then we could analyse the effect of dentin scraping at apical foramen when using Root ZX to meature root length.Method:20 extracted teeth with single root and complete foramina were selected.Removed the crown of the tooth just above the cementoenamel junction.Using 15# K file and Root ZX measured root length,Then preparing root canal to 30# measured root length again.Result:Prepare root canal to 30#,most of root length measured increased.When cleaning the scraping at apical foramen,the root length decreased.Conclusion:Scraping at apical foramen can effect the veracity of Root zx.
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