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.

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.

When to intervene in the caries process? An expert Delphi Consensus statement -

This article gives recommendations on when to intervene in the caries process and existing caries lesions by non- or micro-invasive means or invasive/restorative strategies. The activity of the caries lesion, whether there is a cavity, and if it is possible to clean, are main factors to decide intervention level. In-active lesions need no treatment (exception […]

Pre-cementation procedures’ effect on dental zirconias with different yttria content -

Several pre-cementation procedures have been advocated to enhance adhesion between zirconia and resin-based cement. There is, however, limited documentation on how these pre-treatments affect the strength of zirconia crowns as most tests are performed on discs or bars.
The aim was to assess the effect of pre-cementation procedures on fracture mode, fracture strength and cement retention on zirconia.

Characterization and toxicity evaluation of air-borne particles released by grinding from two dental resin composites in vitro -

The project aims to evaluate whether inhalation of particles released upon grinding of dental composites may pose a health hazard to dentists. The main objective of the study was to characterize the dust from polymer-based dental composites ground with different grain sized burs and investigate particle uptake and the potential cytotoxic effects in human bronchial cells.

Genetic Aspects of Dental Erosive Wear and Dental Caries (Review Article) -

The present review aims to give an overview of the literature focusing on novel genetic aspects of dental erosion and dental caries. Once the tooth erupts into the oral cavity, the regenerative capability of enamel is fundamentally limited due to the loss of dental epithelium during eruption. The susceptibility or resistance to dental erosion and caries is presumably a result of environmental, phenotypic, and/or genetic influence. Even though it is evident that individuals frequently exposing their teeth to acid and sugar are at high risk of developing dental erosion and caries, the findings exclusively based on these factors are elusive.

Survival of primary molars with pulpotomy interventions: public oral health practice-based study in Helsinki -

The study concludes: “The estimated survival time of pulpotomized primary molars is affected by dental operator- related factors, which should be considered in management of extensively carious primary molars of paediatric patients, both at the clinical and organizational decision-making levels. An increased focus on the use of SSC is recommended to be in the learning objectives of dental education programs.

Luting cements in a nutshell -

Choosing luting cements can be challenging given the constant development of resin cements and ceramic materials for indirect restorations. This review article gathers the most commonly used luting cements in current dental practice, focusing particularly on these cements’ composition and properties, which have an impact on their clinical indication. The article includes adhesive and non-adhesive […]

The influence of the resin- based cement layer on ceramic-dentin bond strength -

The purpose of the study was to measure the cement thickness obtained when ceramic rods were luted to dentin and to analyze the relation between cement thickness and the previously published tensile bond strength of similar test specimens. In addition, the ISO standard 4049:2019 method was used to determine the film thickness of the used […]

Áhrif þykktar bindilags og yfirborðsmeðferða á viðgerðarstyrk plastblendis -

Að mæla ahrif þykktar bindilags og mismunandi yfirborðsmeðferða a viðgerðarstyrk plastblendis.

Scaffold-Free Engineering of Human Cartilage Implants -

Despite new strategies in tissue engineering, cartilage repair remains a major challenge. Our aim is to treat
patients with focal lesions of articular cartilage with autologous hyaline cartilage implants using a scaffold-free approach. In this article, we describe experiments to optimize production of scaffold-free cartilage discs.

Violet‑blue light exposure of the skin: is there need for protection? -

Advocates of skin protection against blue light express concern about exposure to indoor lighting and electronic screens aswell as natural outdoor exposure. However, the nature of adverse effects in skin is unclear and the doses to induce effectsare unknown. We aimed to reveal whether there is a scientific basis for promoting skin protection against violet-blue […]

Stainless-steel crowns in children: Norwegian and Finnish dentists’ knowledge, practice and challenges -

Stainless-steel crowns (SSCs) are recommended for restorative treatment of young teeth severely affected by caries, fractures or dental developmental disorders (DDDs). However, despite recommendations and clinical evidence, SSCs are not widely used by general dentists, who favour extraction and more conventional restorations. The present study aimed to investigate the views of and use of SSCs among Norwegian and Finnish dentists.

Allergic reaction after treatment with a mandibular advancement device -

Mandibular advancement devices (MADs) are used in the treatment of obstructive sleep apnea. A patient (woman in the 60-ies) was treated with a MAD (SomnoDent Fusion Flex; SomnoMed AG). She experienced reactions in form a burning sensation in the mouth, ulcers on the tongue and gingiva, and swelling of the tongue. Allergy test (patch test) with Dental Screening Series showed a strong positive reaction to methyl methacrylate, and clear reactions to ethylene glycol dimethacrylate (EGDMA) and 2-hydroxyethyl methacrylate (HEMA).

The dream of new teeth -

The dental community has for a long time been fascinated by the thought of growing a third set of teeth. This has increased research interest in the processes of embryonal development of teeth for experimental copying. However, research of this kind cannot be performed on humans for medical and ethical reasons.

Knowledge on and treatment practices of erosive tooth wear among Finnish dentists -

The aim of the study was to investigate Finnish dentists’ knowledge on and means of recording, detecting and
diagnosing erosive tooth wear (ETW). Treatment options and possible differences in treatment decisions
between general and specialized dentists were also evaluated.

Antimicrobial and physicochemical characterization of endodontic sealers after exposure to chlorhexidine digluconate -

The primary aim of root canal treatment of teeth with apical periodontitis is to eliminate the microbial load from the root canal system and promote periapical healing. Meticulous mechanical debridement of the root canal system significantly reduces the bacterial load and is considered important in canal disinfection. However, complete elimination of all microorganisms is challenging, as viable bacteria potentially remain on the dentin walls and inside dentinal tubules, both in planktonic forms and biofilms. About 35% of the root canal area is left untouched when conventional rotary and hand instruments are used. Therefore, disinfection with irrigation solutions during root-canal treatment and thereafter obturation of the root canal are important factors to reduce the amount and growth of residual bacteria.

Hvor mye monomer kan lekke fra en protese? -

Protesematerialer inneholder ureagert monomer som kan lekke ut i munnhulen og gi bivirkninger, men i hvor stor grad skjer dette? Tanntekniske laboratorier fremstilte protesematerialer etter sin vanlige metode og NIOM analyserte mengde ureagert monomer, såkalt restmonomer. Kaldakryl hadde større mengde restmonomer enn kokakryl og derfor et større potensiale for å gi bivirkninger. Ett av produktene […]

Adhesion of Escherichia Coli to Nanostructured Surfaces and the Role of Type 1 Fimbriae -

In this study a method of producing a large number of identical nanostructured surfaces is presented. E. coli wild type and deletion mutants of the type 1 fimbriae monomers FimA or FimH were tested for their ability to adhere to such surfaces with different interpillar distance of 100, 250, and 500 nm, respectively. An increase in interpillar distance (reduced surface coverage) was associated with reduced adhesion of E. coli wild type and the deletion mutants. In addition, the presence of a functional type 1 fimbria decreased adhesion to the nanopatterned surfaces in comparison to deletion mutants, leading us to the conclusion that there is a relationship between presence of a functional fimbriae and adhesion towards tested surfaces. The hypothesis that the presence of fimbriae had an effect on bacterial attachment to nanostructured surfaces was verified. These current results could provide insight into development of new nano-patterned structures with anti-adhesion bacterial properties.

Awareness, knowledge and treatment decisions for erosive tooth wear: A case-based questionnaire among Danish dentists -

This study showed that the majority of Danish dentists taking part of this survey had adopted a minimally invasive approach for the management of erosive tooth wear in young adults. There was however room for improvements in diagnosis, scoring and case documentation

In vitro abrasivity and chemical properties of charcoal-containing dentifrices -

The use of charcoal for oral hygiene purposes has long traditions in several countries. Products containing charcoal are constantly being introduced to the market, advertising various advantageous properties, such as a whitening effect and detoxification.

Aerosols in the dental clinic. Part 2: Precautions for reducing infection -

Aerosols are generated secondary to different treatment procedures and situations in the dental clinic. Aerosols in the dental clinic may be infectious and transfer disease between clinic staff and patients. The authors present and discuss different measures to reduce infection caused by exposure to microbial aerosols. It is unrealistic to expect that close range aerosols […]

Aerosols in the dental clinic. Part 1: Risks of infectious disease transmission -

Aerosol-generating procedures associated with oral care may involve risks for disease transmission between patients and dental staff. Article part I describes characteristics of aerosols and possible influence on health. This paper focuses on microbial aerosols and on situations and procedures that produce microbial aerosols in the dental clinic. Several forms of microbial aerosols are created […]

Effect of silica nano-spheres on adhesion of oral bacteria and human fibroblasts -

This study investigated the effect of surface nano-patterning on adhesion of an oral early commensal colonizer, Streptococcus mitis and the opportunistic pathogen Staphylococcus aureus and human fibroblasts (HDFa) in a laminar flow cell.