Wurzelkanalaufbereitung mit rotierenden Ni-Ti FlexMaster® und MFile® Instrumenten,eine Vergleichsstudie
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Philipps-Universität Marburg
Abstract
Aim: To compare two Ni-Ti rotary root canal systems FlexMaster [FM] and
MFile [MF].
Methodology: 2 x 70 (= 140) artificial root canals were prepared to ISO #35.
Fracture rate, preparation time and changes to the root canal geometry were
recorded. Results: In none of the evaluated root canals were zip or ledge
configurations observed. The use of FM instruments caused statistically less
elbows in the canals compared to MF instruments (p < 0,01%). FM
instruments transportated canals at point 7 mm from the apex significantly
more than MF instruments (p < 0,001%). Correct preparation length was
achieved with both systems. The mean time of preparation of a root canal
was significantly less with the MF system (p < 0,001%). The registered
fracture rate was zero with FM, with MF it was 25.7% between the 2nd and the
7th treatment (p < 0,001%). Torsion was observed in more than 50% of
MFiles that preparated the medial and the apical third of the canal. FM
instruments showed no torsion Conclusions: Repeated usage of MF
instruments in curved canals is not recommended due to high rate of fracture
and torsion. One time usage is to be preferred. Reducing the number of
instruments from 9 (FM) to 4 (MF) increases mechanical stress of the files.
Instruments with shorter working parts remove less material from the inner
curvature and cause less transportation. Prior to clinical usage more
investigations at extracted molars are needed
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This item has been published with the following license: In Copyright