PURPOSE This study was conducted to compare the cumulative survival rates (CSRs) and the incidence of postloading complications (PLCs) between a bone-level internal connection system (ICS-BL) and an external connection system (ECS). METHODS The medical records of patients treated with either a ICS-BL or ECS between 2007 and 2010 at Asan Medical Center were reviewed. PLCs were divided into two...

OBJECTIVE To evaluate, through biomechanical testing, the resistance to and energy required for the occurrence of proximal femoral fracture in synthetic bone after removal of a proximal femoral nail model (PFN), comparing the results obtained with a reinforcement technique using polymethylmethacrylate (PMMA). METHODS Fifteen synthetic bones were used: five units for the control group (CG), fi...

OBJECTIVE This study investigated the compressive fracture strength and failure pattern in premolars submitted to endodontic treatment and internal bleaching with 37% carbamide peroxide for 21 days, with application of different restorative procedures. MATERIAL AND METHODS Six groups were employed (n = 10): 1) non-bleached teeth and pulp chamber sealed with IRM; 2) bleached teeth and pulp cha...

To the Editor: We read with interest the article by Dhamangaonkar et al.1 May the authors clarify the following points. 1. A dynamic hip screw (DHS) with fixed angle locking screws reduces the risk of implant failure, particularly for patients with osteoporotic bone or less stable fracture configurations.2 Why did the authors compare a proximal femoral locking plate with a non-locking 135o DHS?...

Whether axillary artery injuries associated with proximal humeral fractures must be repaired is uncertain. The present study reports three cases treated with various approaches. In case 1, the left humeral surgical neck was broken, the radial pulse disappeared and the arm temperature was significantly reduced. Computerized tomography angiography (CTA) revealed a 3-cm filling deficiency in the a...

Rock masses generally contain many fissures filled with weak materials. At present, the interaction mechanisms of crack coalescence and seepage in rock are still poorly understood. Therefore, this study conducts systematic laboratory tests on sandstone samples two under hydromechanical coupling conditions. The influences fissures, filling, ligament length, bridge angle strength, fracture patter...

OBJECTIVE Vertebrae with lytic metastases have an elevated risk of burst fracture and resultant neurologic compromise. Prophylactic vertebroplasty has the potential to reduce pain and the risk of burst fracture in the metastatic spine. The purpose of this study was to quantify the ability of vertebroplasty to stabilize metastatically involved vertebrae against the risk of burst fracture initiat...

objectives this study aimed to assess the effect of object position in the field of view (fov) of cbct on detection of vrfs in teeth with intra-canal posts. materials and methods the crowns of 60 extracted premolar teeth were cut at the level of cementoenamel junction (cej). root canals were filled with gutta-percha and filling of the coronal 2/3 of the root canals was subsequently removed to f...

The types of fractured-vuggy reservoirs are diverse, with dissolution holes and fractures different scales as the main reservoir spaces. Clarifying connectivity between wells is crucial for improving recovery rate avoiding problems poor water- flooding balance serious water channeling. A traditional dynamic connected model hardly describes geological characteristics multiple media, such karst c...

Surface subsidence in coal mine areas can cause serious geological hazards. After a seam is mined, the overlying rock layers fracture, collapse, and expand; fractured bulking masses are then continuously compacted under action of overburden load, which eventually leads to surface subsidence. Overburden isolated grout filling via boreholes, high-pressure grouting mining-induced fissures hard lay...