Different analytical methods have been used to investigate the chemical composition of crown and bridge veneering materials. High-performance liquid chromatography with diode array detection system was used for identification and quantification of the monomers in the resin systems

The surface characteristics of eight posterior and two anterior composite resins were studied by SEM and profilometric tracings.

Resin-bonded bridges may replace missing teeth and act as splints in periodontal treatment. The objective of this study was to investigate the etch pattern after electrolytic etching of selected Co-Cr alloys in hydrochloric acid and to assess the changes in alloy composition after different etching times.

The flexural properties of poly(methyl methacrylate) (PMMA) reinforced with carbon/graphite (C/G) fibers with three different surface treatments were investigated by transverse bend testing after dry and wet storage.

The purpose of the investigation was to study the effect of water storage on the bond strengths between silanized, silicoated Ag-Pd alloys and veneered composites, in comparison with the bond strengths of systems with conventional retention beads.

The properties of an alloy with 65% Pd, 30% Co and 5% Ga have been investigated with consideration to the requirements of a ceramic fusing alloy. The composition of the alloy was at the outset chosen because of a reasonably low melting point of 1200°C. The mechanical properties were found to be satisfactory (σ0.2≈ 530 MPa, total elongation ≈5%).

This investigation demonstrated that the conversion can be correlated with the composition of monomers and oligomers used in the materials.

Healing caps are used during the healing period after abutment connection on titanium implants of the Branemark type. These healing caps consist of a screw embedded in polyamide-6 (PA-6) which is considerably weakened during this healing period. The properties of PA-6 and poly(4-methyl-1-pentene) (PMP) were studied

The purpose of this investigation was to determine the water sorption and solubility, as well as the filler composition and extent of chemical degradation in water, of eight different posterior composites.

The percent pore area and the mean pore size were measured in specimens made of nine brands of composite resin restorative materials. The overall percent porosity ranged from 0.01 to 4.5%

Conventional bridge framework of gold alloys are expensive. After in vitro investigations, materials were selected for preparing bridges from carbon/graphite reinforced poly(methyl methacrylate) on titanium implants

The purpose of this investigation was to determine some mechanical properties of eight different posterior composites, and how they are affected by water sorption.

Conventional bridge frameworks of gold alloys are expensive. A method for preparing bridges from carbon/ graphite reinforced poly(methyl methacrylate) on titanium implants is described.

The water sorption, solubility, hardness, and color stability of thin specimens of auto-polymerized and heat-polymerized denture base polymers with and without a UV light-polymerized coating material were investigated

Abstract

Three commercial palladium alloys (PdCuGa, PdCoGa, and PdAgSn) were melted and cast in graphite and ceramic crucibles in order to introduce small, but different levels of carbon impurities in the alloys. The solubility of carbon is known to become smaller with decreasing temperature, and in the present alloys small amounts of carbon were found to cause a substantial reduction in ductility as measured by the elongation in a tensile test.

The shape of the clasps on removable partial dentures often has to be adjusted by bending. Occasionally they fracture during the small plastic deformation that takes place during the adjustment. The tendency to brittle failure of three Co-Cr-Mo alloys for prosthetic use with different carbon and chromium contents was investigated by tensile testing

A silver-palladium type of dental alloy for fixed restorations has been investigated with regard to the ability of the material to be plastically deformed in uniaxial tensile testing after two different age-hardening treatments. A certain degree of ductility is required for the burnishing of the margins.

A dental alloy consisting of Ag-Pd-Cu-Au has been annealed at various temperatures and subsequently quenched to produce a solid solution before a hardening heat treatment. The phases present were studied by means of X-ray diffraction measurements.

Aluminum oxide, aluminum hydroxide, aluminum fluoride-trihydrate, and titanium dioxide hydrate were added to a commercial polycarboxylate cement. The first substance increased the setting time and certain physical properties. The others decreased the same properties to varying degrees

The electron-impact and methane chemical-ionization mass spectra of selected methacrylate and acrylate monomers commonly used in dental materials are reported and discussed.

Studies by means of infrared multiple internal reflection spectroscopy of ultraviolet and visible light polymerized composite resin materials indicated that the degree of conversion below the surface is nearly constant for most of the materials investigated until a depth is reached where the degree of conversion rapidly decreases.

Creep characteristics of four light activated composite of different composition were determined at 37 and 50 degrees C. The creep properties were compared with the composition of the materials.

The purpose of this investigation was to determine residual monomers, the insoluble gel fraction, and singly reacted dimethacrylate monomers in heat-polymerized, auto-polymerized conventional and pour-type denture base materials.

Abstract

The effect of three different lining materials on the investment expansion during the casting procedure, was compared. The accuracy of the castings was assessed by measuring slits at the gingival shoulder of a cast veneer crown. The liners were made of asbestosos, paper and a glassfiber material.

Eight females and eight males, 20 to 25 years old, were asked to produce a succession of maximum bites at three second intervals for as long as possible. The mean maximal bite force was 500 N ranging from 330 to 680 N.

This investigation has shown that the thickness of the unpolymerized film on cured dental resins is related to the composition and the initiating system.

Two methods for measuring shear strengh of the porcelain-metal interface, a rod/disk-push test and a cube/cube-push test, were compared using the same metals and porcelain material. Both types of specimen showed evidence of complex stress distribution at the interface during loading and fracture line located mainly in the opaque porcelain layer. Both methods were thus mainly a test of the “strength” of the porcelain at the interface.

The release of formaldehyde in an aqueous environment at 37 degrees C from the surface of heat-polymerized, and auto-polymerized dough and pour type acrylic denture base materials was determined quantitatively.

The creep characteristics of heat-polymerized and auto-polymerized dough and pour type denture base materials were measured at 23, 37, and 50 degrees C with emphasis on secondary steady state creep rates.

Heat-polymerized denture base materials with the cross-linking agent 1,4-BDMA and with different amounts of the cross-linking agent EGDMA have similar flexural properties.

The polymerization in thin films on smooth tooth surfaces was assessed for four conventional bonding and pit and fissure sealants and one new acetone-containing sealant.

The quantity of the remaining unreacted methacrylate groups in polymerized composite materials has been determined. Six proprietary composites were investigated by infrared multiple internal reflection spectroscopy.

The aim of this work was to determine the quantity of remaining unreacted methacrylate groups in polymerized dental sealants.