Abstract:
:The bonding strength of porcelains to metals depends on the oxide layer between the porcelain and the metal. Oxidation of a metal surface increases the bonding strength, whereas excessive oxidation decreases it. Titanium and its alloys are gaining acceptance for dental use since they exhibit excellent biocompatibility, corrosion resistance, low specific gravity, good mechanical properties, and low cost. However, titanium suffers from its violent reactivity with oxygen at high temperatures that yields an excessive thick layer of TiO2, and this presents difficulties with porcelain bonding. The present study deals with the oxidation kinetics of titanium simulated to porcelain firing and evaluating surface nitridation of titanium as a process of controlling the oxidation behavior of titanium. Nitrided samples with the Arc Ion Plating PVD process and un-nitrided control commercially pure titanium (CPT, Grade 1) were subjected to oxidation simulating firing of Procera porcelain with 550 degrees, 700 degrees, and 800 degrees C firing temperatures for 10 min in both 1 and 0.1 atmospheric air. Weight difference before and after oxidation was calculated and the parabolic rate constant, Kp (mg2/cm4/s), was plotted against inverse absolute temperature. Surface layers of the samples were subjected to x-ray and electron diffraction techniques for phase identifications. Results revealed that both nitrided and un-nitrided samples obey a parabolic rate law with activation energy of 50 kcal/mol. In addition this study shows that nitrided CPT had a Kp about 5 times lower than the un-nitrided CPT and hence the former needs about 2.24 times longer oxidation time to show the same degree of oxidation. Phase identification resulted in confirming the presence of TiO2 as the oxide film in both groups but with 1-2 microns thickness for the un-nitrided CPT and 0.3-0.5 micron thickness for the nitrided samples. Therefore it can be concluded that nitridation of titanium surface can be effective in controlling the surface oxide thickness that might ensure satisfactory bonding with porcelain.
journal_name
Biomed Mater Engjournal_title
Bio-medical materials and engineeringauthors
Oshida Y,Hashem Asubject
Has Abstractpub_date
1993-01-01 00:00:00pages
185-98issue
4eissn
0959-2989issn
1878-3619journal_volume
3pub_type
杂志文章abstract::This paper established the extracting method and algorithm for liposome images on the basis of analyzing the form feature of liposome, and its corresponding automatic analysis software. Some algorithms, such as the logical algorithms of mathematical morphology, the grayscale-gradient co-occurrence matrix-based method ...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:2002-01-01 00:00:00
abstract::Some computer applications for cell characterization in medicine and biology, such as analysis of surface structure of cell wall-deficient EVC (El Tor Vibrio of Cholera), operate with cell samples taken from very small areas of interest. In order to perform texture characterization in such an application, only a few t...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:2001-01-01 00:00:00
abstract:OBJECTIVES:to assess reliability and reproducibility of quantitative MRI (7 T) in assessing rat femoro-tibial cartilage volume. METHODS:5 healthy rat knees were scanned in vivo using a 7 T experimental imager. Sagittal high resolution 3D Gradient Echo with fat suppression sequences were performed with a dedicated home...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:2008-01-01 00:00:00
abstract::Sepsis is a systemic inflammatory response syndrome with high mortality, which results from severe infection and can lead to secondary organ dysfunction. It is one of the most common cause of death in intensive care unit. Clinical reports have shown that sepsis was often accompanied by thyroid dysfunction, which is ca...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章,评审
doi:10.3233/BME-171646
更新日期:2017-01-01 00:00:00
abstract::High order partial least squares (HOPLS) is a novel data processing method. It is highly suitable for building prediction model which has tensor input and output. The objective of this study is to build a prediction model of the relationship between sinoatrial node field potential and high glucose using HOPLS. The thr...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-151482
更新日期:2015-01-01 00:00:00
abstract::A multidirectional pin-on-plate reciprocating machine was used to compare the wear performance of UHMWPE sliding against cast cobalt chrome (CoCr) plates that were either untreated or coated with Amorphous Diamond Like Carbon (ADLC). The test conditions were based on a 1/5 scale model representative of in vivo motion ...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:2001-01-01 00:00:00
abstract::Skilled behavior is difficult or impossible to articulate explicitly by the performers. Likewise biomechanical models of skilled motor actions are often limited by the lack of knowledge of the underlying mechanisms. A 'behavioral cloning' technique is described, based on a trained artificial neural network (ANN), that...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:1998-01-01 00:00:00
abstract::Acrylic resins have been used in many different applications in dentistry, especially in the fabrication of provisional fixed partial dentures. Ideally, a provisional crown and bridge material should be easy to handle and should protect teeth against physical, chemical, and thermal injuries. Some of the problems assoc...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:2002-01-01 00:00:00
abstract::Surface roughness has been considered as an important influencing factor for cell response. The aim of this study was to find out whether MC3T3-E1 cells, a mouse osteoblast-like cell line, can sense the amplitudes of surface topography of titanium alloy (Ti6Al4V), and if surface-dependent cell morphology would be pres...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-151301
更新日期:2015-01-01 00:00:00
abstract::Hydroxyapatite was coated with 1 microm thickness on titanium columns of a length of 10 mm, an outer diameter of 4.0 mm by radio frequency magnetron sputtering. The hydroxyapatite coating titanium columns were implanted in the diaphysis of femora of 3 adult dogs, and push-out test was carried out after 2, 4 and 12 wee...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:2001-01-01 00:00:00
abstract::Mechanical testing has been performed to characterize the locking strength of Morse taper locks used for reconstruction of large bone defects. Taper joint pairs were locked with a series of compressive loads increasing from 500 to 3500 N. Following each load application the taper locks were distracted with either an a...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:1997-01-01 00:00:00
abstract::The aim of this study is to design a statistical segmentation technique to allow extraction of grey matter, white matter and cerebral spinal fluid volumes from diffusion tensor imaging. Four channel maps of the DTI are used as the input features, which provide more information for brain tissue segmentation compared wi...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-130927
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Cuff electrodes have been widely used chronically in different clinical applications. Advancements have been made in selective stimulation by using multi-contact cuff electrodes. Steering anodic current is a strategy to increase selectivity by reshaping and localizing electric fields. There are two configura...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-151281
更新日期:2015-01-01 00:00:00
abstract::Numerous constitutive models describing the mechanical properties of tendons have been proposed during the past few decades. However, few were widely used owing to the lack of implementation in the general finite element (FE) software, and very few systematic studies have been done on selecting the most appropriate pa...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-2011-0653
更新日期:2011-01-01 00:00:00
abstract::Dry emulsion containing curcumin (DE-CUR) was prepared for oral delivery of poorly water-soluble curcumin, and its oral bioavailability and antiasthmatic efficacy was evaluated. After comparison of the solubility of curcumin in various oils, Plurol® Oleique CC497 was selected to be the oil phase due to its higher solu...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-130886
更新日期:2014-01-01 00:00:00
abstract::A novel technique and product for carpal tunnel microscopic surgical procedures using a modified medical device containing a head as a surgical scalpel under light guidance were designed and studied. The novel design of the medical device was developed and applied in a new carpal tunnel microscopic surgical procedure ...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-151303
更新日期:2015-01-01 00:00:00
abstract::DMPC and DSPC liposomes were prepared via thin film hydration method followed by sonication. Propranolol solution was incorporated into liposomes at hydration stage. TEM images showed the sizes of DSPC and DMPC were around 88 and 137 nm, respectively. The highest encapsulation ratio of propranolol was approximately 70...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-140997
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Gait analysis, such as portable gait rhythmogram (PGR), provides objective information that helps in the quantitative evaluation of human locomotion. OBJECTIVE:The purpose of this study was to assess the reliability of PGR in post-stroke patients. METHODS:Two raters (A and B) examined 48 post-stroke patien...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-206007
更新日期:2020-01-01 00:00:00
abstract:PURPOSE:To establish a method for mouse coronary angiography in vivo using synchrotron radiation, which is essential for physiological and pathological research on coronary diseases. METHODS:1) The imaging parameters (e.g., photon energy, spatial resolution of the detector, and injection rate of contrast agent) optima...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-130937
更新日期:2014-01-01 00:00:00
abstract:INTRODUCTION:Repairing contour defects is a challenge in plastic surgery. Different filling materials have been used with inadequate results and complications. The autologous fat transfer is the standard technique at the moment, but adipose tissue reserves are limited. The aim of our study was to compare in vivo on an ...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:2008-01-01 00:00:00
abstract::Modeling of thermal-induced mechanical behaviors of soft tissues is of great importance for thermal ablation. This paper presents a method by integrating the heating process with thermal-induced mechanical deformations of soft tissues for simulation and analysis of the thermal ablation process. This method combines bi...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-141043
更新日期:2014-01-01 00:00:00
abstract::The values of the propagation coefficient measured on a silicon rubber tube in the frequency range 1-15 Hz were compared, using four different equations. The first formula is based on three simultaneous pressure measurements performed at equidistant points; the remaining three equations are original, and make use of o...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:1992-10-01 00:00:00
abstract::Gabexate mesilate is a non-peptide protease inhibitor, developed in Japan, which is used in the treatment of acute pancreatitis and disseminated intravascular coagulation. This compound is readily hydrolyzed as it has ester bonds in its structure. It is now out of patent in Japan and there are many generic versions on...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-2010-0611
更新日期:2010-01-01 00:00:00
abstract::Hyaluronic acid (HA) was used as an internal phase additive to improve the loading efficiency of ofloxacin, a hydrophilic drug encapsulated by hydrophobic polylactic-co-glycolic acid (PLGA) materials, through a double emulsion (water-in-oil-in-water) solvent extraction/evaporation method. Results from laser distributi...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-130863
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Retearing mechanism after transosseous equivalent (TOE) rotator cuff repair has not been fully clarified yet. OBJECTIVE:The purposes of this study were to compare the stress distribution pattern in the tendon stump between knotted and knotless TOE repair and to investigate the role of suture tension applied...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-171673
更新日期:2017-01-01 00:00:00
abstract::The aim of the present study was to determine the degradability of aliphatic polyurethanes, based on a different amount of synthetic, atactic poly[(R,S)-3-hydroxybutyrate] (a-PHB), in hydrolytic (phosphate buffer) and oxidative (H2O2/CoCl2) solutions. The soft segments were built with atactic poly[(R,S)-3-hydroxybutyr...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-151262
更新日期:2015-01-01 00:00:00
abstract::Electroencephalograph (EEG) signals feature extraction and processing is one of the most difficult and important part in the brain-computer interface (BCI) research field. EEG signals are generally unstable, complex and have low signal-noise ratio, which is difficult to be analyzed and processed. To solve this problem...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-141113
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Physical activity plays a tremendous role in determining bone mechanical behavior, which is superimposed to gravidity. OBJECTIVE:Compare the geometric and material responses of the rat femur to a high intensity treadmill running training of a relatively short duration, as assessed by 3-point mechanical test...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-171684
更新日期:2017-01-01 00:00:00
abstract::The thrust of the present work is the demonstration of the feasibility of using an enzyme-linked immunosorbent assay (ELISA) for the detection and quantification of a monoclonal antibody human serum. The antibodies used, 7E3 and D3GP3, have been proposed as platelet receptor blockers, being directed specifically again...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:
更新日期:1994-01-01 00:00:00
abstract::Intensity-Modulated Radiation Therapy (IMRT) mathematically forms a large-scale optimization problem. The development of an IMRT plan is computationally expensive resulting in time-consuming, inefficient, and difficult to develop high-quality IMRT plans. By combining prior knowledge with proposed novel measures derive...
journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
doi:10.3233/BME-141173
更新日期:2014-01-01 00:00:00