Comparative study of shaping efficiency in C-shaped canals of mandibular second molars / 中华口腔医学杂志
Chinese Journal of Stomatology
;
(12): 151-153, 2008.
Article
in Chinese
| WPRIM
| ID: wpr-235960
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the shaping efficiency of three instrumentation techniques in the C-shaped canals.</p><p><b>METHODS</b>Sixty extracted mandibular second molars with C-shaped canals were selected and cross-sectioned at 2, 5, 8 mm from the apex by using a muffle system as described by Bramante. The teeth containing C-shaped canals were randomly divided into three groups, respectively instrumented using stainless steel K-files in step-back and step-down techniques, and ProTaper series in crown-down technique. The digital images of canal cross-sections pre- and post-instrumentation were photographed to evaluate the proportion and position of uninstrumented area Working length loss and perforation were recorded. Data were analyzed using ANOVA.</p><p><b>RESULTS</b>Step-down technique gained smaller uninstrumented area in the coronal third of the canals, while step-beck technique gained the same results in the apical third (P < 0.05). Uninstrumented proportion in apical part was significantly higher than in the middle and the coronal (P < 0.05). Instrumenting type I canal as 2 or 3 separated canals was likely to reduce the miss. There were three perforations in manual stainless steel K-file groups.</p><p><b>CONCLUSIONS</b>Early opening the coronal part of C-shaped canal, shaping C-shaped canal as two or three separated canals and instrumenting the apical part with step-back technique, seemed to be the effective methods to avoid miss.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Root Canal Preparation
/
Dental Pulp Cavity
/
Methods
/
Molar
Limits:
Adult
/
Aged
/
Aged80
/
Humans
Language:
Chinese
Journal:
Chinese Journal of Stomatology
Year:
2008
Type:
Article
Similar
MEDLINE
...
LILACS
LIS