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Document Type |
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Article In Journal |
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Document Title |
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Wear Resistance of Pro taper Universal Rotary NiTi Retreatment Files- An SEM Wear Resistance of Pro taper Universal Rotary NiTi Retreatment Files- An SEM |
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Document Language |
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English |
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Abstract |
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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. |
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ISSN |
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1687-1979 |
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Journal Name |
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madiha M.Gomaa.et al. |
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Volume |
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59 |
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Issue Number |
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2 |
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Publishing Year |
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1434 AH
2013 AD |
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Article Type |
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Article |
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Added Date |
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Wednesday, April 17, 2013 |
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Researchers
| مديحة جمعه | Juma, Madiha | Researcher | | |
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