Effects of 3 different residual root treatments after post-and-core restoration: An in vitro fracture resistance experiment and finite element analysis

Effect of different custom-made mouthguard palatal extensions on the stress-state of dentoalveolar: a 3D-FEA

“…The FEA method is an experimental method that simulates in nite complex bodies with nite and interrelated elements, which simpli es complex biomechanical problems. [14] It can simulate invasive contacts or areas that are di cult to measure in the body and reduce the di culty of experiments and related costs. However, the FEA method itself needs to be simpli ed and the experimental conditions perfected.…”

“…First, the image data of the previous study [14] was imported into reverse engineering software, including that from Mimics Medical 17.0 (Materialize, Leuven, Belgium) and Geomagic Studio 12.0 (Geomagic, Inc., Research Triangle Park, NC, United States). Then, in sequence, built and optimized (mesh repair, modify deviation points, simplify, mesh data, construct surface, construct mesh and t surface, etc.)…”

“…The Critical modi ed von-Mises stress takes the difference between compressive and tensile strengths into account and scales the resulting equivalent stress value in each material relative to the tensile strength of enamel [17], maximum principal stress is often used for failure criteria for fragile structures (such as teeth) and deformation is often used to evaluate the deformation of structures under stress. [14,15] In the present study, the distribution and peak values of the Critical modi ed von-Mises stress, maximum principal stress and displacement of dentoalveolar models were calculated to evaluate the in uence of the position of the MG palatal edge on dentoalveolar biomechanics.…”

Effect of bone defect width and a ferrule on the fracture characteristics of vertically fractured teeth reattached with adhesive resin cement: An <i>in vitro</i> study

“…With a 3-mm-wide defect, specimens with a ferrule showed greater fracture load than those without a ferrule. The ferrule effect is known to increase retention of restorations 32) and increase root fracture resistance 22,25,33) . Samran et al reported that the fracture resistance of teeth with a ferrule was 37% higher than of teeth with no ferrule 33) .…”

“…One cause of debonding of the composite resin core from the root is low bonding strength between the dentin and the composite resin core [35][36][37][38] . The tooth without a ferrule is often found to have debonding at the interface between the root and the core restoration 29,32) . In addition, restorations with a narrow post cavity in the root canal are prone to low bonding strength between the composite resin core and the dentin because of the smear layer and the residue of the endodontic obturating material 38) .…”