Kliniczna ocena średnicy kanału korzeniowego w odcinku przywierzchołkowym w zębach ze zmianami okołowierzchołkowymi i bez nich
Studies conducted by the use of microcomputed tomography scans confirmed, for example, that the fit of the initial apical file was poor [5]. Moreover, in approximately one-fourth of the canals the apical portion has an oval-shaped section and the long canal diameter is equal to or larger than twice the short canal diameter and in this case the recorded diameter is the smaller of the two [4]. From these studies it can be assumed that clinical assessment of the apical diameter has a margin of error that cannot be avoided but reduced. Based on observation of the apical diameter in human teeth [22-24] some authors have in fact suggested that the apical portion of the root canal should be enlarged three sizes larger than the first file that clinically binds to the working length in order to obtain a good debridement of the apical region [30-32]. A recent clinical study concluded that in simple root canal systems only apical instrumentation larger than the recommended size might reduce the debris and number of remaining bacteria in this area of the canal [16, 21-25, 28-35]. They have also shown that larger apical size yields cleaner canals that may promote further success. Failing to clean canals, especially in the apical region, can result in treatment failure [34, 35].
Furthermore, being able to evaluate the minor diameter and knowing that a value inferior to that of the real dimension is often recorded in the clinic [...]
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