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KMID : 0376319940060010307
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Dental Journal of CNU
1994 Volume.6 No. 1 p.307 ~ p.316
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The comparison of Canal Shaping Ability by Engine-Driven Nickel-Titanium File and Endosonic File in Curved Canal
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Abstract
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The purpose of this study was to evaluate canal shaping ability after canal preparation by using engine-driven nickel-titanium file and endosonic file in curved canals.
The 30 mesiobuccal canal of molars extracted within recent 3 months were divided into 3 groups. Group I and group II were prepared by using engine-driven nickel-titanium Gates-Glidden drill type and the engine-driven nickel-titanium file type.
Group III
prepared by using endosonic file.
The image of preinstrumented canals were taken by X-ray. The image of postinstrumented canal was taken by X-ray in the same condition of preinstrumentation.
A magnified X-ray image on magnifier screen was traced and then compared the preinstrumentated canal image with the postinstrumentated canal image by superimposing method.
@ES The following results were obtained:
@EN 1. In the change of canal curvature, the engine-driven nickel-titanium Gates-Glidden drill type showed the least change and the ultrasonically filing showed the greatest change.
2. In the percentage of canal enlargement, the engine-driven nickel-titanium file type was greatest at all levels(p<0.05), the apex of all group was the greatest, the difference of ultrasonically filing group showed greater between apex and
cervix.
3. The percentage of canal enlargement on convex side was greater than that of on concave side in apex of each group(p<0.05).
In the ultrasonically filing group, both sides of canal enlargement showed sharply differeence(p<0.01).
4. The percentage of canal enlargement on convex side was greater than that of on concave side in the third of cervix of the engine-driven nickel-titanium file type and the ultrasonically filing.
The percentage of canal enlargement of convex and concave side in the third of middle of the engine-driven nickel-titanium Gates-Glidden drill type show a similar canal enlargement between convex side and concave side.
As above result, the engine-drive nickel-titanium file type was greater in canal enlargement that the other instruments.
The engine-driven nickel-titanium Gastes-Glidden drill type was efficient endodontic instrument for curved canal preparation because it was least change in canal curvature.
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