Sutural physical model building in the three-dimensional finite-element model of maxillofacial bones / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To build the physical model of four suturae which are related to the growth of maxilla in the three-dimensional finite-element model of maxillofacial bones.</p><p><b>METHODS</b>A 16 years old volunteer with individual normal occlusion, good periodontium health condition and without diseases of temporomandibular joint was chosen to be the material of modeling. The three-dimensional finite-element model of the volunteer's maxillofacial bones was built using the CT scan and the finite-element modeling method. Finally we built the physical model of four suturae which were related to the growth of maxilla in the model of maxillofacial bones.</p><p><b>RESULTS</b>The model of maxillofacial bones with 86,575 nodes and 485,915 elements was generated. This model contained four suturae including sutura frontomaxillaris, sutura zygomaticomaxillaris, sutura temporozygomatica and sutura pterygopalatine.</p><p><b>CONCLUSION</b>A three-dimensional finite-element model of maxillofacial bones with good biological similarity was developed.</p>

A three-dimensional finite element study on composite archwire applied in extraction cases / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To explore mechanical properties of the composite archwire (CoAW) applied in extraction cases.</p><p><b>METHODS</b>The mandibular three dimensional model was established by spiral computed tomography scanning and SOLIDWORKS 2001 PLUS software. The archwire model was established by means of ANSYS software. The mechanical analysis and calculation of CoAW were carried out.</p><p><b>RESULTS</b>With the diameter of NiTi part of CoAW gradually augmented (the diameter of stainless steel part kept unchanged), the stress on teeth gradually increased. As the diameter of stainless steel part of CoAW gradually augmented (the diameter of NiTi part kept unchanged), the stress on teeth also gradually increased. The CoAW (0.30 mm NiTi round wire combined with 0.36 mm stainless steel round wire) produced the least force on teeth. There was little contradistinction between six kinds of CoAW and stainless steel wire on the stress of posterior teeth.</p><p><b>CONCLUSIONS</b>The stress on teeth closely correlated with the diameter of the composite archwire.</p>