Document Details

Document Type : Article In Journal 
Document Title :
Wear Resistance of Pro taper Universal Rotary NiTi Retreatment Files- An SEM
Wear Resistance of Pro taper Universal Rotary NiTi Retreatment Files- An SEM
 
Document Language : English 
Abstract : Aim: To investigate the wear resistance of Protaper Universal (PTU) rotary retreatment files as correlated to the number of use. Methodology: Ten sets of three files each (n=30 files) of PTU retreatment files (01, 02, and 03) were experimented with. They were inspected as received from the manufacturer for surface quality and imperfections using a stereo microscope (x40). Representative PTU samples were also examined using SEM. 40 freshly extracted double rooted maxillary premolars teeth were used for the study. Canals were prepared and obturated with Gutta Percha and Pulp Canal Sealer using continuous wave of compaction; after which they were grouped randomly into three groups of 40, 20, and 20 canals respectively. Un-filling of the obturated premolars canals of group I (40 canals) was done so that each instrument set (01, 02, 03) was used in un-filling of 4 canals. This was followed by stereomicroscopic and SEM examination. The previous PTU files' sets were then used in unfilling of teeth of group II (6 canals unfilling), and group III (8 canals unfilling). Following canals' unfilling of each of the previously mentioned groups; PTU files were subjected to the same sequence of stereomicroscopic and SEM examination to examine the features of instrument's wear. The wear criteria perceived and studied were: No visible defect (NVD), Pitting (P), Distorted machine grooves (DG), Blade blunting (BB), Microfracture (MF), and Blade turnover (BT). Results: 67% of the as received instruments showed NVD. Two thirds of the used instruments showed rapid increase in the visible wear features after unfilling of 4 canals. On the other hand, all of instruments gradually showed different kinds of visible defect after being used in unfilling of 6 and 8 canals. Generally, highly significant difference were detected between most of tested instrument conditions as compared to the as received (pvalue =0.000). Exceptions were MF after unfilling of 4 canals as stated above as well as after unfilling of 6 canals. Conclusion: Under the conditions of this study, Protaper Universal retreatment rotary files can be safely used in unfilling of 4-6 canals provided that no visible signs of distortion are noted. 
ISSN : 1687-1979 
Journal Name : madiha M.Gomaa.et al. 
Volume : 59 
Issue Number : 2 
Publishing Year : 1434 AH
2013 AD
 
Article Type : Article 
Added Date : Wednesday, April 17, 2013 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
مديحة جمعهJuma, Madiha Researcher  

Files

File NameTypeDescription
 35424.pdf pdf 
 35425.pdf pdf 
 35426.pdf pdf 

Back To Researches Page