Elemental composition, corrosion resistance and mechanical properties of computer-aideddesign and computer-aided manufacturing fixed retainers versus conventional fixed retainers -

This study investigate the elemental composition, corrosion resistance, and mechanical properties of computer-aided design and computer-aided manufacturing (CAD-CAM) retainers versus conventional fixed retainers (FRs).

Profiling of cyclic di-adenyl and -guanyl nucleotides and their precursors and degradation products in bacteria using LC–MS/MS -

The 3,3′-linked cyclic dinucleotides (CDNs) of adenosine monophosphate (AMP) and guanosine monophosphate (GMP), cyclic di-AMP (c-di-AMP), cyclic di-GMP (c-di-GMP), and c-GMP–AMP (cGAMP) are second messenger molecules in bacteria that regulate processes, such as biofilm formation, motility, virulence, stress response, and cell wall homeostasis.

Behandling av tenner med dyp karies -

The pulp has many important roles as to the function and survival of teeth. Teeth with deep carious lesions should be treated conservatively if possible. There are several treatment options for this purpose, but they all have in common the necessity of finding a reliable and correct diagnose for the «health status» of the pulp before making a treatment decision. Modern approaches to caries treatment have moved from a pure mechanistic view to a more biological view.

Endodontic sealers after exposure to chlorhexidine digluconate: An assessment of physicochemical properties -

Final root canal irrigation should ideally maintain the physicochemical stability of root canal sealers. We seek to assess the effect of contact with 2% chlorhexidine digluconate (CHX) on the physicochemical properties of AH Plus, BioRoot™ RCS, and Pulp Canal Sealer (PCS)…

Antibacterial Activity of Root Repair Cements in Contact with Dentin—An Ex Vivo Study -

This study assessed the antibacterial characteristics of the dentin/material interface and dentin surfaces exposed to experimental hydraulic calcium silicate cement (HCSC) with or without bioactive glass (BG) replacement (20% or 40%) or mixed with a silver nanoparticle (SNP) solution (1 or 2 mg/mL), and Biodentine, TotalFill BC RRM putty and Intermediate Restorative Material (IRM). Human […]

Repair bond strength of bulk-fill composites: influence of different primers and direction of debonding stress -

The purpose of this in vitro study was to evaluate the effect of different adhesion primers on the repair bond strength of bulk-fill resin composite and short-term hydrolytic stability of the repair interface before and after accelerated aging. In addition, direction of debonding stress was examined…

Functional and aesthetical properties of single dental crowns. -

The aims of the study were to investigate functional and aesthetic properties, the composition of the alloy, and the content of hazardous elements of single dental crowns with metal skeleton and fired porcelain. Epoxy models made from full mouth impressions taken of a patient with a crown preparation of the right maxillary first permanent molar […]

Effect of exposure conditions on chemical properties of materials for surgical endodontic procedures -

This study investigated the role of aging and changes in environmental conditions on selected properties of a prototype radiopacified calcium silicate-based cement (TZ-base) with or without incorporation of silver nanoparticles or bioactive glass, and two commercial materials, Biodentine and intermediate restorative material. Materials were immersed in ultrapure water or fetal bovine serum for 28 days […]

Implantoplasty and the risk of fracture of narrow implants with advanced bone loss: A laboratory study -

In this study, the aim is to assess the impact of implantoplasty (IP) on maximum implant failure strength of narrow diameter implants of different type/design and material, with simulated advanced bone loss.

Investigation of biological effects of HEMA in 3D-organotypic co-culture models of normal and malignant oral keratinocytes -

Several in vitro studies utilizing 2-dimensional (2D) cell culture systems have linked 2-hydroxyethyl methacrylate (HEMA) with cytotoxic effects in oral mucosa and dental pulp cells. Although such studies are invaluable in dissecting the cellular and molecular effects of HEMA, there is a growing interest in the utilization of appropriate 3-dimensional (3D) models that mimic the structure of oral mucosa.

Cobalt-chromium alloys in fixed prosthodontics: Investigations of mechanical properties and microstructure -

The results from the present study demonstrated higher mechanical properties for the laser-melted and presintered milled Co-Cr, followed by the cast and milled Co-Cr specimens. In general, the Ti6Al4V demonstrated higher mechanical properties compared with CpTi4. The high mechanical properties of the laser melted Co-Cr specimens compared with the other Co-Cr specimens were consistent with those of other studies.

Biological aspects of modern dental composites -

Biological evaluation of resin-based dental composites has traditionally been based on in vitro endpoint tests with different methods to determine loss of cell viability and cell morphology changes after exposure to the material or monomer constituents. The data reveals a potential for biological effects, but clinical relevance of such data is limited. Positive allergy tests and […]

Deterioration of direct restorative materials under erosive conditions with impact of abrasion and attrition in vitro -

This article compare the cumulative impact of sequential wear on mechanical properties and appearance of a composite resin, a glass ionomer, and a glass hybrid. It was concluded that the composite resin was the most mechanically resistant to the sequential wear

De mest brukte komposittene på det norske markedet oppfyller ikke alle formelle krav i ISO-standarden -

Denne undersøkelsen viser at en oppfatning om at et komposittmateriale tilfredsstiller formelle krav i en standard hvis produktet er merket med CE eller ISO 4049 ikke uten videre medfører riktighet.De fleste medfølgende bruksanvisninger på komposittene vi undersøkte, hadde mangler i forhold til hva som kreves av oppgitt informasjon i ISO 4049:2019, og opplysningene hadde enkelte […]

Presence of 6PPD-quinone in runoff water samples from Norway using a new LC–MS/MS method -

The chemical 6PPD-quinone is highly toxic to some fish species of the Oncorhynchus and Salvelinus genera and is the oxidation product of the common car tire additive 6PPD. We present a new sample preparation method that involves liquid-liquid extraction of water samples followed by silica-based solid phase extraction prior to LC–MS/MS analysis. The new sample preparation method showed good […]

Silver release from dentine treated with combinations of silver diamine fluoride, potassium iodide and etching -

For individuals with very high to extremely high caries activity and poor control of daily oral hygiene, a simple treatment for arresting their caries activity is necessary. Silver Diamine Fluoride (SDF) has become increasingly common for this purpose due to its efficacy and ease of application. To avoid or reduce tooth discoloration after SDF treatment […]

Preparation of a fluorinated dental resin system and its anti-adhesive properties against S. mutans -

Resin system prepared exclusively with fluorinated methacrylate monomers reduced the S. mutans adhesion due to their increased hydrophobicity and decreased surface energy. Compared with Bis-GMA/TEGDMA, the FDMA/FBMA resin system also exhibited higher double bond conversion and lower water sorption and solubility

Oral lesions associated with daily use of snus, a moist smokeless tobacco product. A cross-sectional study among Norwegian adolescents -

Use of snus, a moist, smokeless tobacco product, may lead to local changes in the oral mucous membrane in the area where the snus is placed. It can also cause irreversible gingival retraction. This cross-sectional study aimed to investigate the relationship between use of snus, oral mucosal lesions (snus induced lesions) and gingival retractions among adolescents in Norway.

Association of locus Xq26.1 – 27.3 with Erosive Tooth Wear Phenotypes in a Group of Adolescents -

Erosive tooth wear is a multifactorial condition of an increasing prevalence. There is a need for discovering individual genetic predisposition for the development of this condition. Considering that the chromosome X locus was shown to be associated with dental caries, the aim of the present study was to look for the association between this locus […]

Bacterial phototoxicity of lumichrome photocrosslinked collagen hydrogels -

In response to the World Health organization’s (WHO) call to develop alternative antibacterial methods, we investigate endogenous compounds and biopolymers.

Resin-based cements – properties affecting clinical success of indirect restorations -

Resin-based cements are frequently used for cementing indirect restorations, especially when the restorations are made of all-ceramic material. The cement has many important roles, e.g. prevent loosening of the restoration and provide optical matching with tooth substance or mask discoloration. Pre-treatment of tooth substance and restoration, cement composition and strength, mixing and application method, depth […]

How French dentists manage defective restorations: Evidence from ReCOL the French dental practice-based research network –A survey study -

Repair of DRs is a conservative approach to increase the longevity of these restorations. Despite its limitations, the present study indicates that a significant proportion of Fr-GDPs still do not make sufficient use of dental restoration repair on a routine basis. A lack of knowledge of the concept seems to explain at least part of this situation.

Surface characteristics and bacterial adhesion of endodontic cements -

Changes in the surface characteristics of prototype TCS-based cements by inclusion of SNP and BG or exposure to different environments did not affect bacterial adhesion. All experimental materials showed inferior physical properties and higher antibacterial effect than Biodentine.

Effect of chlorhexidine digluconate on antimicrobial activity, cell viability and physicochemical properties of three endodontic sealers -

The main hypothesis of the study as rejected as exposure to CHX affected sealers’ properties. CHX in contact
with sealer surfaces improved the antibacterial properties of the sealer leachates and reduced cell viability for all sealer leachates, except for freshly mixed PCS. Among the tested sealers, BioRoot RCS leachates presented the highest antibacterial properties and cell viability with and without CHX contact.

Photoactive Zr-aromatic hybrid thin films made by molecular layer deposition -

In this work, we have developed a new MLD process for fabricating photoactive hybrid thin films based on Zr clusters and aromatic 25D-BDC organic linkers. The amorphous and uniform films display high absorption in the visible part of the spectrum. Moreover, we show that the type of the organic ligand and its functional groups can be used to tune the optical properties of Zr-organic hybrids, as shown by the Zr-2A-BDC and Zr-26-NDC systems in this work.

Potential of «universal» bonding agents for composite repair -

In this in vitro study, testing shear bond strength of composite-to-composite bonding, the new universal bonding agents performed similar and for some agents better than the ‘Gold Standard’, 3-step etch-and-rinse bonding agent. New simplified bonding procedures seem reliable for repair of composite.

Optical and mechanical properties of multi-layer zirconia -

Zirconia currently holds a significant portion of the market for fixed dental prostheses in Norway, and the types of dental zirconia available are increasing. Advertising slogans such as high translucent”, “super translucent”, and “ultra translucent”, among others, are commonly used to describe today’s dental zirconias. In addition, the term “multi-layer zirconia” is used to describe […]

Sintering temperature accuracy and its effect on translucent yttria-stabilized zirconia: Flexural strength, crystal structure, tetragonality and light transmission -

The aim of this study was to investigate how lower and higher sintering temperature deviations in dental furnaces compared to the recommended firing protocols affected certain material properties of different translucency, chemical composition and recommended sintering temperatures, under the null hypothesis that there will not be any differences in properties investigated between the studied groups.

Protein-coated nanostructured surfaces affect the adhesion of Escherichia coli -

Nanotopography influences on bacterial adhesion were investigated with surfaces with controlled interspatial nanopillars distances. Surfaces were coated with proteins (fibrinogen, collagen, serum and saliva) prior to E. coli adhesion under flow conditions. PiFM provided chemical mapping and showed that proteins adsorbed both between and onto the nanopillars with a preference to areas between the nanopillars. E. coli adhered least to protein-coated areas with low surface nanopillar coverage, most to surfaces coated with saliva, while human serum led to the lowest adhesion. Protein-coated nanostructured surfaces affected the adhesion of E. coli.

Wear particle release at the interface of dental implant components: Effects of different material combinations. An in vitro study -

The objective of this study was to evaluate the effect of combining implant and abutment materials on wear and particle release in a dynamical loading setup.

The dentine-sealer interface: Modulation of antimicrobial effects by irrigation -

The aim of this study was to assess whether sodium hypochlorite (NaOCl) or chlorhexidine (CHX) and two irrigation protocols may alter the antibacterial properties of dentine and three endodontic sealers using a novel ex vivo tooth model.

Shear bond strength of resin bonded zirconia and lithium disilicate – effect of surface treatment of ceramics and dentin -

The purpose of the study was to investigate the effect of ceramic surface pretreatment, effect of resin cement and dentin surface roughness on shear bond strength.

Hvordan utføre rettsodontologisk identifisering av personer uten tannrestaureringer? -

The most commonly performed task for forensic dentists in Norway is identification of deceased persons. Forensic dental identification of a victim is based on an objective comparison of the deceased’s dental status with collected dental information from a missing person. Until now, dental identification has been established mostly based on restorative treatment seen in the […]

3D printing i odontologi -

The development of digital techniques in dentistry is rapid. The use of 3D-printing for the production of resin-based constructions has become more widespread in recent years and new materials, printers and accessories are constantly becoming available.

Factors associated with initiation and use of snus among adolescents -

This study investigate factors associated with the initiation and continuation of snus use in adolescents in Norway. The associations with adolescents’ own educational plans, the parents’ educational level(s) and tobacco habits were estimated.
These findings may aid in developing and targeting tobacco prevention strategies aimed at young people. Tobacco prevention measures should start at the elementary school level. The strong association with parental tobacco habits underlines the importance of parents’ influence on their children’s tobacco use.

Therapeutic Strategies for Dry Mouth Management with Emphasis on Electrostimulation as a Treatment Option – Review Article -

Xerostomia is a subjective sensation of dry mouth. It is commonly associated with salivary gland hypofunction. Both changes in the composition of the saliva and a reduction in the quantity secreted may be an objective finding of dry mouth.

Áhrif sílans og ljósherðingar á viðgerðarstyrk plastblendis -

Að mæla μ-togþols viðgerðarstyrk milli gamlaðs og nýs plastblendis með því að nota sílan og mismunandi bindiefni sem voru hert eða óhert þegar nýju plastblendi var bætt við.

Medical devices in dentistry – the new MDR regulation -

Den 26 maj började det nya direktivet för medicintekniska produkter inom tandvården at gälla fullt ut. Fokus ligger främst på krav på uppdaterad dokumentation och riskanalys samt förbättrad spårbarhet.

Molecular layer deposition of photoactive metal-naphthalene hybrid thin films -

We here report on photoactive organic-inorganic hybrid thin films prepared by the molecular layer deposition (MLD) method. The new series of hybrid films deposited using 2,6-naphthalenedicarboxylic acid (2,6-NDC) and either hafnium chloride (HfCl4), yttrium tetramethylheptanedionate (Y(thd)3) or titanium chloride (TiCl4) were compared with the known zirconium chloride (ZrCl4) based system.