Corrosion of dental aluminium bronze in neutral saline and saline lactic acid. -

OBJECTIVE: To compare the corrosion behaviours of two aluminium bronze, dental casting alloys during a standard immersion test and for immersion in neutral saline.

Bond strength of composite luting cement to zirconia ceramic surfaces -

Treatment of zirconia ceramic surfaces with plasma spraying or a low fusing porcelain pearl layer significantly increased the bond strength of resin cement to the ceramic surface.

Evaluation of adhesion of chairside hard relining materials to denture base polymers. -

The chemical composition of the bonding agents and the relining materials and their combinations affected the depth of the swollen layers of the denture base polymers and the tensile strength of adhesion.

Direct relining of dentures with soft materials -

Recent advances in dental materials give possibilities of new clinical techniques. Although easier to use, timesaving and more biocompatible than before, direct soft relining materials create new problems. An understanding of the clinical indications and limitations of these materials is crucial for clinical success

Toxicity of endodontic filling materials -

The toxicity of endodontic materials is reviewed. The patient may be exposed by constituents leaching from the unset and set sealer and by accidental overfilling of the root canal. For most patients the exposure is believed to be below the threshold for a toxic effect.

Fråga NIOM: Fiberarmerade protetiska material. Vad kan vi göra i dag og vilka möjligheter kommer att finnas i framtiden? -

Forskningen på fiberförstärkta polymera material är omfattande men de kliniska uppföljningstiderna korta. Efterfrågan på prisvärda, hållfasta och estetiskt fördelaktiga material är dock stor.

NIOM i endring. Nytt fra NIOM -

NIOM i endring
NIOM har fått ny logo og har endret navn fra Nordisk institutt for odontologisk materialprøvning til Nordisk Institutt for Odontologiske Materialer. Artikkelen beskriver den modernisering som instituttet har gjennomgått.

Evaluation of two matrix materials intended for fiber-reinforced polymers -

Abstract: Two matrix resins for fiber composites that remain in a fluid state during storage and handling before polymerization were evaluated. The resin mixtures, based on methyl methacrylate (MMA), were produced with two different cross-linking agent systems: 1,4-butanediol dimethacrylate and ethylene glycol dimethacrylate or diethylene glycol dimethacrylate. Water sorption, water solubility, water uptake and residual […]

Formation of photoproducts and cytotoxicity of bilirubin irradiated with turquoise and blue phototherapy light. -

To compare a new turquoise (“green”) fluorescent phototherapy lamp (490 nm) with a conventional blue phototherapy lamp (450 nm) with respect to cytotoxicity and photochemical effects of bilirubin.
Conclusion: The two lamps were similar in the formation of therapeutically relevant photoproducts, but the blue lamp showed potential in forming more photo-oxidation products and in causing more severe cellular damage in the presence of bilirubin.

Effects of bilirubin and phototherapy on osmotic fragility and haematoporphyrin-induced photohaemolysis of normal erythrocytes and spherocytes. -

AIM: To study the effects of phototherapy on erythrocyte haemolysis in vitro and to determine possible differences in sensitivity to phototherapy between normal erythrocytes and spherocytes.
CONCLUSION: Bilirubin may make the plasma membrane of normal erythrocytes more fragile. Newborns with hereditary spherocytosis may be sensitive to phototherapy.

Bilirubin-induced cell death during continuous and intermittent phototherapy and in the dark. -

Continuous and intermittent light exposure caused the same degree of apoptotic cell death, while the cells underwent more necrotic death after intermittent exposure. Bilirubin was cytotoxic in the dark by both cell death mechanisms.

Irritation and cytotoxic potential of denture adhesives. -

The present study aimed to examine the in vitro biocompatibility of denture adhesives.
Denture adhesives absorb water to become viscous and sticky, and by this process, other constituents like colouring, flavouring, wetting and preserving agents may be released. Some of these constituents may induce adverse reactions among users of denture adhesives.

Studies on curcumin and curcuminoids. XXIX. Photoinduced cytotoxicity of curcumin in selected aqueous preparations. -

Natural curcumin was evaluated as a potential photosensitizer for oral applications. The photocytotoxicity of curcumin on salivary gland acinar cells (SM 10-12) was investigated in five aqueous preparations consisting of 5% DMSO, non-ionic micelles, cyclodextrin, liposomes, or a hydrophilic polymer.

An in vitro comparison of the shear bond strength of a resin-reinforced glass ionomer cement and a composite adhesive for bonding orthodontic brackets -

The shear bond strength (SBS) of a light-cured, resin-reinforced glass ionomer and a composite adhesive in combination with a self-etching primer was compared after different setting times to evaluate when orthodontic wires could be placed. Additionally, the fracture site after debonding was assessed using the Adhesive Remnant Index (ARI).

Physicochemical evaluation of silica-glass fiber reinforced polymers for prosthodontic applications -

This investigation was designed to formulate silica-glass fiber reinforced polymeric materials. Fused silica-glass fibers were chosen for the study. They were heat-treated at various temperatures (500°C, 800°C and 1100°C), silanized, sized and incorporated in two modified resin mixtures (A and B). The flexural properties in dry and wet conditions were tested and statistically analyzed, and the content of residual methyl methacrylate (MMA) monomer, dimensional changes with temperature, water sorption and solubility were determined.

Hvor holdbare er komposittmaterialene? -

Det har over tid skjedd en endring i valg av tannfyllingsmaterialer blant nordiske tannleger. Polymerbasert komposittmateriale er i dag det vanligste tannfyllingsmaterialet i Norden. I artikkelen svares det på spørsmål angående tannfyllingsmaterialer

Spør NIOM: Tannbleking med lys – hvor står vi i dag? -

Kosmetisk odontologi med bruk av blant annet tannbleking griper om seg. Markedsføringen både overfor pasienter og tannleger er omfattende, og mulighetene til å oppnå suksess gjennom hvitere tenner er innlysende.

Static immersion and irritation tests of dental metal-ceramic alloys. -

The expansion of the European Union is bringing new types of metal-ceramic alloys to the market, i.e. alloys probably unknown in Western-European dentistry. The aim of this study was to investigate recent developments and “classic” alloy compositions (one iron and two cobalt alloys, unalloyed titanium and an experimental titanium-zirconium alloy, and one gold alloy containing copper and zinc)

In vivo spectroscopy of jaundiced newborn skin reveals more than a bilirubin index -

The aims of this study were to improve the algorithms for calculating a transcutaneous bilirubin index (TcB), to follow the bilirubin concentrations during phototherapy and to evaluate possible changes in skin optical parameters such as pigmentation and erythema during phototherapy.