A structure-based modelling framework was established to simulate the three-dimensional autogenous shrinkage of cement paste. hydration model, HYMOSTRUC3D-E, used obtain microstructures and ionic concentrations lattice fracture model based on effective stress modulus consider elastic creep parts shrinkage. For Portland pastes with water-to-cement ratios 0.3 0.4 (where time zero set as drop in i...

One of the methods used to investigate the damaged zone in rock structure is the acoustic emission method. This method is based on receiving the elastic waves that are produced by deformation and cracking of the rock mass around the underground excavation. In this research, a study is conducted on the rock samples by a numerical method to investigate the damaged zone caused by the excavat...

statement of problem: a general process in implant design is to determine the reason of possible problems and to find the relevant solutions. the success of the implant depends on the control technique of implant biomechanical conditions. objectives: the goal of this study was to evaluate the influence of both abutment and framework materials on the stress of the bone around the implant by usin...

Accurate stress field calculation of the casing-cement-stratum system is crucial for evaluating wellbore integrity. Previous models treated in-situ as boundary pressure loads, leading to unrealistic infinite displacements at infinity. This study presents a three-dimensional (3D) analytical solution within in inclined wells, considering and hydrostatic cement initial state taking into account co...

Calcium phosphate cements (CPCs) should ideally have mechanical properties similar to those of the bone tissue the material is used to replace or repair. Usually, the compressive strength of the CPCs is reported and, more rarely, the elastic modulus. Conversely, scarce or no data are available on Poisson's ratio and strain-to-crack-initiation. This is unfortunate, as data on the elastic respons...

Y-S Lai, H-W Wei and C-K Cheng 1 Institute of Biomedical Engineering, National Yang Ming University, Taipei, TAIWAN 2 Joint Prosthesis Technology Research Center, National Yang Ming University, Taipei, TAIWAN INTRODUCTION Aseptic loosening of the component is an important long-term complication of total hip arthroplasty. Kobayashi et al. found that the factor which affecting aseptic loosening o...

OBJECTIVE To compare biodegradable magnesium phosphate cement (Mg-cement), calcium phosphate cement (Ca-cement), and no cement on bone repair, biocompatibility, and bone adhesive characteristics in vivo in horses. ANIMALS 8 clinically normal adult horses. PROCEDURES Triangular fragments (1-cm-long arms) were created by Y-shaped osteotomy of the second and fourth metatarsal bones (MTII and M...

The cement gland is a simple secretory organ that marks the anterior-most dorsal ectoderm in Xenopus embryos. In this study, we examine the timing of cement gland induction and the cell interactions that contribute to cement gland formation. Firstly, we show that the outer ectodermal layer, from which the cement gland arises, becomes specified as cement gland by mid-gastrula. Curiously, at earl...