Master Apical File Emphasis has traditionally been placed on determining the canal length with little consideration of the canal diameter in the apical portion of the root. Since every canal is unique in its morphology the apical canal diameter must be assessed. The size of the apical portion of the canal is determined by placing successively larger instruments to the corrected working length until slight binding is encountered (Figure 16-25). Often the next larger instrument will not go to the corrected working length. If it does go to length a subjective estimation of the apical diameter must be made depending on the degree of binding. This file will be the master apical file (initial file to bind). It is defined as the largest file to bind at the corrected working length following straight line access. This provides an estimate of the canal diameter before cleaning and shaping and it is the point where the step-back preparation begins. What about Youre appointment my doctor??!!
Posted on: Sat, 12 Apr 2014 14:26:46 +0000