2020 Volume 11 Issue 1 Pages 8-12
It is unfortunately not uncommon to encounter cases of tooth fracture with difficulty preserving teeth in clinical practice. The mesio-distal root coalesces to the mandibular second molar on the cheek side, whereas they do not coalesce on the lingual side, and with high probability, manifest C-shaped roots with deep grooves. Therefore, we conducted a structural analysis of this typical C-shaped root using frames in order to clarify the appearance of fracture. Frame is just a stress calculation for a cross section indicating only the tendency of fracture. By applying this frame model and more precisely calculating the risk by taking into account the actual dentin thickness or by subdividing the calculation and examining the detailed stress distribution, we can not only obtain figures other than those obtained from image data such as CBCT, but also prevent root breakage by root canal enlargement during treatment while considering the influence of force directionality.
