Creep studies of multiphase acrylic systems -

The influence of type and quantity of five different crosslinking agents on tensile creep properties of multiphase acrylic systems has been studied.
The investigation showed higher creep values for autopolymerized than for heat-polymerized materials.

Release of formaldehyde from dental composites. -

Polymeric composite materials may contain releasable degradation products or unreacted constituents. Release of formaldehyde from nine different composites was investigated

Composites — Characterization of composite filling materials: reactor response. -

This review paper describes the composition, conversion, and properties of presently available composite materials

Adhesion to titanium of methacrylate-based polymer materials. -

The purpose of the investigation was to study the bond strength between silanized titanium specimens and poly(methyl methacrylate) (PMMA).
The average bond strength of the specimens after dry storage at 37°C was 25 MPa. Water storage for 30, 60 or 90 days at 37°C reduced the bond strength to approximately 9–11 MPa.

Creep and recovery of composites for use in posterior teeth during static and dynamic compression -

The deformation behavior of 8 different posterior composites under uniaxial static and dynamic compression have been investigated.

Monomers and filler content of resin-based crown and bridge materials -

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

Surface characteristics of posterior composites after polishing and toothbrushing -

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

Etching patterns of Co-Cr alloys for bonded cast restorations -

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.

Carbon/graphite fiber reinforced poly(methyl methacrylate): properties under dry and wet conditions. -

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.

Adhesion of resins to Ag-Pd alloys by means of the silicoating technique. -

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.

A new dental Pd−Co alloy for ceramic veneering -

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%).

Composites for use in posterior teeth: composition and conversion -

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

Polymers for healing caps on titanium implants -

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

Water sorption and filler characteristics of composites for use in posterior teeth. -

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.

Porosity in posterior composite resins -

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%

Development of carbon/graphite fiber reinforced poly (methyl methacrylate) suitable for implant-fixed dental bridges. -

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

Composites for use in posterior teeth: mechanical properties tested under dry and wet conditions -

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

Implant-fixed, dental bridges from carbon/graphite fibre reinforced poly (methyl methacrylate) -

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.

Some properties of a denture acrylic coating -

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

Carbon impurities and properties of some palladium alloys for ceramic veneering -

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.

Ductility and structure of some cobalt-base dental casting alloys -

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

Ductility of a dental Ag-Pd-Cu-Au alloy -

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.

Phase equilibrium in Ag-Pd-Cu dental alloys -

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.

The influence of various admixes on the physical properties of a polycarboxylate cement. -

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

Identification of methacrylates and acrylates in dental materials by mass spectrometry -

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

Conversion in different depths of ultraviolet and visible light activated composite materials. -

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.

Compressive creep of light cured resin based restorative materials. -

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.

Conversion in denture base polymers. -

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.

The effect of asbestos-alternatives on the accuracy of cast veneer crowns -

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.

A novel miniature bite force recorder and its clinical application. -

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.

Unpolymerized surface layers on sealants. -

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

Bond strength of porcelain to dental alloys – an evaluation of two test methods -

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.

Release of formaldehyde from denture base polymers -

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.

Compressive creep of denture base polymers -

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.

Flexural properties of denture base polymers -

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.

Problems with sealants for bracket bonding -

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.

Remaining methacrylate groups in composite restorative materials -

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.

An infrared spectroscopic study of sealants -

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