In-vivo histocompatibility and osteogenic potential of biodegradable PLDLA composites containing silica-based bioactive glass fiber.

The purpose of this two-year study was to evaluate the histocompatibility and osteogenic properties of a composite material consisting of poly(l--d,l lactide) (PLDLA) and silica-based bioactive glass fibers in vivo. PLDLA and PLDLA/silica-based bioactive glass fibers pins were implanted into the erector spinae muscles and femurs of beagles. Muscle and bone tissue samples were harvested 6, 12, 16, 26, 52, 78, and 104 weeks after implantation.

Mechanical and degradative properties of PLDLA biodegradable pins with bioactive glass fibers in a beagle model.

The present study aimed to evaluate the mechanical and degradative properties of poly(L-co-D,L-lactic acid)/silicate bioactive glass fibers (PLDLA/SGFs) composite pins in vivo. Both PLDLA and PLDLA/SGFs pins were inserted into the erector spinae muscles and femurs of beagle dogs and were harvested 6, 12, 16, 26, 52, 78, and 104 weeks after insertion. Bone formation around the pins was evaluated by micro-computed tomography.

Effects of core-to-dentin thickness ratio on the biaxial flexural strength, reliability, and fracture mode of bilayered materials of zirconia core (Y-TZP) and veneer indirect composite resins.

Statement Of Problem: Indirect composite resins (ICR) are promising alternatives as veneering materials for zirconia frameworks. The effects of core-to-dentin thickness ratio (C/Dtr) on the mechanical property of bilayered veneer ICR/yttria-tetragonal zirconia polycrystalline (Y-TZP) core disks have not been previously studied.

Purpose: The purpose of this in vitro study was to assess the effects of C/Dtr on the biaxial flexural strength, reliability, and fracture mode of bilayered veneer ICR/ Y-TZP core disks.

Erratum: The effect of various sandblasting conditions on surface changes of dental zirconia and shear bond strength between zirconia core and indirect composite resin.

[This corrects the article on p. 214 in vol. 7, PMID: 26140173.

The effect of various sandblasting conditions on surface changes of dental zirconia and shear bond strength between zirconia core and indirect composite resin.

Purpose: To measure the surface loss of dental restorative zirconia and the short-term bond strength between an indirect composite resin (ICR) and zirconia ceramic after various sandblasting processes.

Materials And Methods: Three hundred zirconia bars were randomly divided into 25 groups according to the type of sandblasting performed with pressures of 0.1, 0.

[Nitric oxide and prostaglandin E2 secretion in osteocytes induced by intermittent cyclic compressive force].

This paper is aimed to investigate the effect of rest-inserted loading on the mechanosensitivity of osteocytes. In the investigation, cultured MLO-Y4 osteocyte-like cells were strained on cyclic compressive force (CCF) by the self-made compressive loading device. Then we observed the effect of different rest periods-inserted loading (5 s, 15 s, 30 s, respectively) on the mechanosensitivity of osteocytes.

[Effects of different surface conditioning agents on the bond strength of resin-opaque porcelain composite].

The objective of this research is to evaluate the effects of different silane coupling agents on the bond strength between Ceramco3 opaque porcelain and indirect composite resin. Five groups of Co-Cr metal alloy substrates were fabricated according to manufacturer's instruction. The surface of metal alloy with a layer of dental opaque porcelain was heated by fire.

The effect of magnesium-incorporated hydroxyapatite coating on titanium implant fixation in ovariectomized rats.

Purpose: This study compared the effect of magnesium-incorporated hydroxyapatite (MgHA) coating with that of HA coating on implant fixation in ovariectomized (OVX) rats.

Materials And Methods: Coatings of HA and MgHA (10 mol% Ca²⁺ replaced by Mg²⁺) were prepared on the surface of titanium substrates using the sol-gel dip-coating method, and powders of HA and MgHA were produced by the same method. The two kinds of materials were then characterized by scanning electron microscopy and x-ray diffraction.

[Zoledronic acid incorporated in chitosan/calcium phosphate ceramic: characterization and in vitro response of osteoblast cells].

Objective: To develop a new local delivery system, zoledronic-acid-loaded chitosan/calcium phosphate ceramic, and to determine its characterization and in vitro response of osteoblast cells.

Methods: Zoledronic-acid-loaded chitosan/calcium phosphate ceramic were prepared by solution casting method at a concentration of 10(-5), 10(-4), and 10(-3) mol/L, respectively. The physicochemical properties of the resulting materials were determined using SEM and FTIR.

Evaluation of a conditioning method to improve core-veneer bond strength of zirconia restorations.

Statement Of Problem: The high strength and fracture toughness of zirconia have supported its extensive application in esthetic dentistry. However, the fracturing of veneering porcelains remains one of the primary causes of failure.

Purpose: The purpose of this study was to evaluate, with shear bond strength testing, the effect of a simple and novel surface conditioning method on the core-veneer bond strength of a zirconia ceramic system.

Shear bond strengths between alumina-toughened zirconia cores and veneering ceramics and their susceptibility to aging.

Objective: To evaluate the shear bond strength (SBS) between alumina-toughened zirconia (ATZ) cores and veneering ceramics, investigate the effect of aging in artificial saliva on SBS and compare it with that of yttria-stabilized tetragonal zirconia polycrystals(Y-TZP).

Methods: Bars of ATZ and Y-TZP were layered with veneering ceramics in accordance to the recommendation of the manufacturer. Half of each group (n = 10) was aged at 134 °C (under 2 bar pressure) in an autoclave for 48 h.

[Microstructure analysis of the machinable infiltrated ceramic fracture surface].

Objective: To compare the fracture surface of the machinable infiltrated ceramic (MIC) prepared in different conditions, and to relate its strength and toughness to the differences in their microstructures.

Methods: The Al2O3 matrix were prepared, infiltrated by the machinable glass and crystallized. Based on sintering and infiltrating time and conditions, the specimens were divided into three groups: Perfect group, insufficiently infiltrated group, mal-sintered substrate group.

Microstructure and mechanical properties of glass-infiltrated Al2O3/ZrO2 nanocomposites.

This work was to investigate the effect of zirconia nanoparticles content on microstructure and mechanical properties of glass-infiltrated alumina/zirconia composites (AZGs). A series of slip-cast zirconia-toughened alumina (ZTA) compacts containing 10, 20, 30 wt% nano-zirconia, respectively, were partially sintered at 1,250°C for 2 h, then infiltrated with lanthanum borosilicate glass of lower thermal expansion at 1,180°C for 4 h. A porosity ranging from 21 to 25% mainly with submicron pore size was demonstrated in the partially-sintered ZTAs.

Effects of sintering temperature and particle size on the translucency of zirconium dioxide dental ceramic.

The aim of this study was to evaluate the effects of sintering temperature and particle size on the translucency of yttrium stabilized tetragonal zirconia polycrystals (Y-TZP) dental ceramic. Eighty disc-shaped and cylindrical specimens were fabricated from zirconia powers of particle size 40 and 90 nm. These specimens were sintered densely at the final sintering temperature 1350, 1400, 1450 and 1500°C, respectively.

[A preliminary study of application of the antibacterial solution containing silver ion to the surface of soft lining material].

We tried to find the effects of the application of the antibacterial solution containing silver ions on the surface of the denture soft lining material. We selected the right concentration of the silver-containing solution and coated a soft lining material with the solution so that the soft lining material could be antibacterial. The antibacterial solution containing silver ions was prepared by sol-gel method.

[Influence of zirconia content on translucency of zirconia-toughened alumina glass-infiltrated ceramic].

Objective: The objective of this study is to investigate the influence of zirconia content which is 0-30.0% weight percentage of matrix on translucency of zirconia-toughened alumina glass-infiltrated ceramics.

Methods: Seven groups were divided according to different weight percentage of zirconia (0, 2.

[Evaluation of alumina effects on the mechanical property and translucency of nano-zirconia all-ceramics].

Objective: To study the effects of alumina content on sintered density, mechanical property and translucency of zirconia nanocomposite all-ceramics.

Methods: Specimens of zirconia nanocomposite all-ceramics were divided into five groups based on their alumina content which are 0% (control group), 2.5%, 5.

[Study and preparation of a novel apatite-wollastonite bioactive glass-ceramic-calcium sulphate hemihydrate composite].

Objective: To prepare a novel apatite-wollastonite bioactive glass-ceramic-calcium sulphate hemihydrate(AW-BGC-CSH) composite, to study its biocompatibility, and to provide experimental support for its further clinical application.

Methods: Samples of AW-BGC-CSH composite were prepared with different AW-BGC granules-CSH ratios (50%, 40%, 30%, 20%). Surface morphology, microstructure and mechanical features of the composite were measured.

The effect of strontium-substituted hydroxyapatite coating on implant fixation in ovariectomized rats.

This study was designed to investigate the effects of strontium-substituted hydroxyapatite coatings with 10 mol% Ca(2+) replaced by Sr(2+) (10% SrHA) on implant fixation in ovariectomized (OVX) rats. Coatings of HA and 10% SrHA were prepared on the surface of titanium implant using sol-gel dip methods, and then characterized by Scanning Electron Microscope, Atomic Force Microscope, X-ray diffraction, X-ray Photoemission Spectroscopy, and an automatic scratch tester. Twelve weeks after bilateral ovariectomy, twenty OVX rats accepted implant insertion in the proximal tibiae, half with HA-coated implants and the other half with 10% SrHA coated implants.

Healing of acute alveolar bone dehiscence following treatment with porous biphasic calcium phosphate in beagle dogs.

The purpose of the present study was to evaluate histologically in beagle dogs the healing in acute dehiscence type defects following treatment with open flap debridement (OFD) with or without porous biphasic calcium phosphate (PBCP). Alveolar bone dehiscence defects were surgically created bilaterally at the labial aspects of maxillary third incisors in 12 beagle dogs. After root conditioning with ethylenediaminetetraacetate, PBCP was filled in the defects and the contralaterals were cured with OFD.

[Effects of Sol-Gel coating on the corrosion resistance of nickel-chronium alloys].

Objective: To investigate the effects of Sol-Gel coating on the corrosion resistance of nickel-chronium alloys in vitro.

Methods: The bond strength of coating-substrate interface sintered at different temperatures (300, 400, 500, 600 degrees C) was tested by scratching method. The Sol-Gel coating was analyzed by scanning electron microscope (SEM), and its corrosion resistance was assessed by a static immersion method.

[The preparation and characterization of sol-gel derived zinc modified carbonated hydroxyapatite].

Objective: To prepare zinc-modified carbonated hydroxyapatite (Zn-CHA) coating material via sol-gel method and explore the influence of zinc substitution on physical and chemical properties of biomaterial samples.

Methods: Two kinds of samples with different zinc content and Ca/P molar ratio were prepared. One was fabricated with 4% zinc and the Ca/P molar ratio was 1.

Periodontal regeneration in experimentally-induced alveolar bone dehiscence by an improved porous biphasic calcium phosphate ceramic in beagle dogs.

Regeneration of lost periodontium is the focus of periodontal therapy. To achieve the effective regeneration, a number of bone graft substitute materials have been developed. This study aimed to investigate the histological response in alveolar bone dehiscences which were filled with an improved biphasic calcium phosphate (BCP) ceramic with more reasonable pore diameter, pore wall thickness and porosity.

[Microdiffraction measurements of natural tooth by high resolution X-ray diffraction equipment].

The main mineral component of natural tooth was determined as calcium apatite many years ago; most of them exist in the form of hydroxyapatite with different crystallites. If a tooth decayed, the crystalline of hydroxyapatite would be changed and decomposed. In our experiment, a natural tooth with caries was measured by high resolution XRD equipment: X'pert Pro.