NOTAS DE ENDODONCIA
APOYO ACADÉMICO
POR ANTOLOGÍAS
UNIDAD
11: LIMPIEZA Y CONFORMACIÓN DEL CONDUCTO RADICULAR
Profesor:
Dr.
Ricardo Rivas Muñoz
4ª Sección de
5 que forman toda la Unidad de
Limpieza y Conformación del Conducto Radicular
REGRESAR A LA SECCIÓN DE TÉCNICAS MANUALES DE
LIMPIEZA Y CONFORMACIÓN DEL CONDUCTO RADICULAR
Tronstand, Leif.
CLINICAL ENDODONTICS. 2nd ed.
Thieme. New York. 2003.
pp.184-187
RESUMEN DEL CAPÍTULO CITADO:
The
principles and goals of the instrumentation phase of endodontic treatment are
the same regardless of instruments or technique used.
It
was spoken of the following techniques:
-
Step-back preparation:
with the step-back technique the diameter of the root canal at the apical
level of instrumentation is kept as small as possible to resist extrusion of
filling material beyond the canal. In addition, the apical parte of the
canal is given a moderately tapered form in an attempt to retain the
obturating materials whitin the canal. Further coronally, the canal is
flared of the canal an to facilitate. The obturation of the canal. The
degree of instrumentation most apically in the root canal is determined by
the size of the first K-file that binds in the canal at the apical lever of
instrumentation. The canal is then larged an additional two instruments
sizes at this level. This mean that if a no. 15 file binds, the canal is
enlarged to a size 25, is called master apical file. Between each change of
file, the full length of the canal is recapitulated with the master apical
file. Further coronally, the canal is then flared with hand or engine-driven
instruments to give it the desired continuous tapered shape.
-
Apical Box Preparation:
the apical box preparation technique was developed with this information in
mind. With this technique, one attempts to give the apical 2-5mm stainless
steel files sizes 08-20, and nickel- titanium file sizes 25 and up. The
apical parte of the root canal is opened up with a K-file used whit filing
motions until the file moves freely in the canal. The next size file is
introduced into the canal with twiddlind motions until the tip is again at
the exact apical level of instrumentation. The preparation systematically
with filing and reaming actions until the canal is enlarged two to three
instrument sizes. The canal is then flared, beginning with a Hedstrom or
engine-driven file one size sameller than the last instrument used
apically.the preparation of the apical part of the canal is completed with
K-type hand or engine-driven instruments. The degree of apical enlargemente
is determined by the size, shape and form of the root of the tooth as seen
in preoperative radiographs.
-
Crown Down Preparation:
the root canal is instrumented in the direction from the canal orifice to
the apical foramen with progressively smaller instruments. In the other
word, this technique works contrary to traditional techniques in which the
instrumentation in principle starts apically and is carried out with
progressively larger instruments ina coronal direction. The crown down
technique has never had a large following, among other things because the
root canal often became clocked by dentin chips and other instrumentation
debris as the instrumentation proceeded in an apical direction.
Tronstand, Leif.
CLINICAL ENDODONTICS. 2nd ed.
Thieme. New York. 2003.
pp.184-187
Investigado y redactado por Magally Hernández
Leyva, Alumna del grupo 1501 (2008), FES Iztacala, UNAM
