[Quantitative monomolecular coverage of barium glass by the silane coupling agent gamma-methacryloxypropyltrimethoxysilane].

Objective: To study the monomolecular coverage of the silane coupling agent gamma-methacryloxypropyltrimethoxysilane (gamma-MPS) on the barium glass filler surface.

Methods: Kubelka-Munk (K-M) function values of the isolated OH-groups on the barium glass filler surface, which were based on the change of gamma-MPS concentrations, were measured using the quantitative analysis of the diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. When all of the isolated OH-groups on the filler surface disappeared (where the K-M function values was zero), the monomolecular coverage of the gamma-MPS molecules on the filler surface was indicated by the linear regression analysis.

[Rheological properties of photo-polymerized composite resin reinforced with retentive filler].

Objective: To determine the rheological properties of the photo-polymerized composite resin reinforced with retentive filler (RF) and its rheological difference with normal filler (NF) composite resin.

Methods: Rheological properties of the composite resins, such as viscosity, shear stress and creep compliance, were measured with dynamic stress rheometer at room temperature (25 degrees C).

Results: The viscosity of the composite resin reinforced with RF is higher than that of NF composite resin (P < 0.

[Effect of particle size distribution of dental poly (methyl methacrylate) beads on the microstructure of denture].

Objectives: To investigate the effect of particle size distribution (PSD) of dental poly (methyl methacrylate) (PMMA) beads on the microstructure of denture.

Methods: It was compared and analyzed that the porosity of three groups of spherical specimens which were made of PMMA beads with different PSD at proper polymer/monomer ratios. And the final microstructure of each group was investigated using Digital High Definition Microscope.

The directionality of share adhesive strength between composite resin and dental hard tissue.

Objective: To inspect the directionality of adhesive strength between composite resins and dental hard tissues.

Methods: Two kinds of composite resins were bonded with their luting kits to the enamel and dentin surfaces of bovine teeth separately. The dead load shear and impact shear testing were performed from both of root apex direction and cutting edge direction.