Endodontic access cavity preparation size. Does it affect instrumentation?

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Conservative endodontic cavity (CEC) and guided endodontic cavity (GEC) preserved more tooth tissue in the crown, pericervical dentine and coronal third of the canal compared with traditional endodontic cavity (TEC) after root canal preparation. The design of the endodontic access cavity did not impact on the effectiveness of canal instrumentation in terms of non-instrumented canal area, canal transportation and centring ratio.