Influence of cervical preflaring on apical file size determination

Abstract

The instrument binding technique for determining anatomical diameter at WL is not precise. Preflaring of the cervical and middle thirds of the root canal improved anatomical diameter determination; the instrument used for preflaring played a major role in determining the anatomical diameter at the WL. Canals preflared with LA Axxess burs created a more accurate relationship between file size and anatomical diameter.

Morphometric evaluation and planning of anticurvature filing in roots of maxillary and mandibular molars

“…This fact demonstrates that it is not always necessary for canals to be accessed with files at a vertical straight line after anticurvature filing, as suggested by some studies. 1,5,6,7,9,10,17 The straight access of files in a vertical line after anticurvature filing simulation was possible in only 29% of mesiobuccal canals from maxillary molars and in 46% of mesial canals from mandibular molars. In the other cases, reaching straight file access would require excessive removal of dentin from coronal and cervical third regions, which can lead to weakening of tooth structure, thus increasing the risk of vertical root fractures ( Figure 3A).…”

“…1,4 Furthermore, the correct establishment of the working length is facilitated, 5 which offers better control of the biomechanical preparation. 6,7,8 Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”

Avaliação histológica da limpeza dos canais radiculares promovida por diferentes métodos de irrigação e análise tomográfica da área apical no comprimento de trabalho

“…A determinação in vitro do diâmetro anatômico apical tem sido muito pesquisada (BARROSO et al, 2005;IBELLI et al, 2007;PAQUÉ et al, 2010;PÉCORA et al, 2005;SCHMITZ et al 2008;VANNI et al, 2005;WU et al, 2000;WU et al, 2002). Os autores afirmam que o melhor resultado na seleção do instrumento apical inicial mostrou-se mais preciso quando o preparo cervical foi previamente realizado.…”

“…Assim, neste trabalho, o preparo cervical dos dentes foi realizado com brocas L.A. Axxess ® , pela sua eficácia (BARROSO et al, 2005;IBELLI et al, 2007PÉCORA et al, 2005VANNI et al 2005).…”

“…No entanto, em estudos sobre a correta detecção do diâmetro anatômico da região apical no comprimento de trabalho (CT), foi ressaltada a importância do preparo cervical, uma vez que esse procedimento tende a auxiliar na correta seleção do instrumento inicial, levando a um adequado alargamento do terço apical (BARROSO et al, 2005;IBELLI et al, 2007;PAQUÉ;MARENDING, 2010;PÉCORA et al, 2005;SCHMITZ et al 2008;WU et al, 2000).…”