Restorative material choices for extensive carious lesions and hypomineralisation defects in children: a questionnaire survey among Finnish dentists -

This survey shows that Finnish dentists are rather homogeneous in their treatment decisions when managing primary tooth caries or a severely affected MIH tooth, although some practices vary between general and specialised dentists. Moreover, the disparity in treatment practices between different areas of Finland is evident. The proportion of SSC as a material choice was low. Patient co-operation plays a big role in treatment decisions and may explain why GICs were the most popular choice for restoring extensive primary tooth caries. The emphasis should be on behavioural management as well as on the evidence-based treatment recommendations.

Effect of thermal cycling on temperature changes and bond strength in different test specimens -

There is no generally accepted protocol for resin composites that simulates and accelerates ageing of the materials under oral conditions. Even though thermal cycling is one of the procedures used to seriously try to simulate physiological aging of restorative materials, review of the literature on thermal cycling procedures shows that there is little or no consistency in protocols and variables. This makes it difficult to compare results from the various investigations. Selection of variables like size of specimens, storage time, and dwell times in water baths, transfer time and number of cycles, appear to be selected by investigators mostly based on convenience rather than referenced observations or scientifically founded facts

Aquaporins’ Influence on Different Dental Erosive Wear Phenotypes in Humans. -

Dental erosive wear is a multifactorial condition of high prevalence. Nowadays, there is an emphasis on discovering individual genetic predisposition for the development of this condition. Aquaporins (AQPs) are water channel proteins expressed in salivary glands, as well as during tooth development. They are involved in salivary secretion and composition and linked to physiological protection of the oral cavity.
The aim of this study was to explore the relationship between different dental erosive wear phenotypes, AQP genes, and selected environmental factors.

MOF thin films with bi-aromatic linkers grown by molecular layer deposition -

Thin films of metal–organic frameworks (MOFs) are promising for a wide range of applications including membranes for separations and sensor materials in microelectronics. Growth of such thin films using atomic/molecular layer deposition (ALD/MLD) has recently been demonstrated; however, the range of examples is still narrow. Here, we expand the repertory of gas-phase MOF thin film […]

Commentary Guidelines on the benefit-risk assessment of the presence of phthalates in certain medical devices covering phthalates which are carcinogenic, mutagenic, toxic to reproduction (CMR) or have endocrine-disrupting (ED) properties -

The guidelines provide a framework to perform a BRA to justify the presence of CMR or ED phthalates in medical devices.
They also describe the evaluation of possible alternatives for these phthalates used in medical devices.
Manufacturers are encouraged to generate data that are needed for the BRA on potential alternatives to be used in medical devices.

Snus i svangerskapet er en fare for barnet -

Bruk av snus under svangerskapet er skadelig for mor og barn. Dette budskapet må leger og annet helsepersonell videreformidle til sine pasienter, sånn at flest mulig kvinner i fertil alder legger vekk snusen før de blir gravide. Snus og andre nikotinerstatningsmidler er ikke risikofrie alternativer til røyking.

Investigation on the antimicrobial activity of chitosan-modified zinc oxide-eugenol cement -

The present study showed that a ZOE-based material has an antibacterial effect and that incorporating CH or COS may increase the antibacterial effect depending on the bacterial species. The total release of eugenol from the materials was stable for up to 18 weeks immersion in water. Eugenol therefore contributed to the antibacterial effect on all the material surfaces investigated. S. mutans exhibited the highest susceptibility to eugenol. The compressive strength of the modified materials was reduced but still met the requirements in ISO 3017.

Bond strength between dentine and a novel fast-setting calcium silicate cement with fluoride -

The aim of this study was to evaluate the dentine bond strength of a novel fast‐setting calcium silicate cement (Protooth) versus a calcium hydroxide‐based cement (Dycal), a calcium silicate cement (ProRoot MTA), and a glass ionomer cement (Ketac‐Molar). Mid‐root dentine slices of 1 mm thickness were obtained from human maxillary incisors. After enlarging the lumen […]

Erosive properties of sour sweets and drinks -

Dental erosion has a multifactorial etiology with contributions from chemical, biological and behavioral factors. In terms of chemical factors, type of foods and drinks is important. The chemical factors that determine whether foods and drinks are erosive are low pH, type of acid, meaning a low acid dissociation constant (pKa), high buffer capacity and low […]

Antimicrobial photodynamic therapy for treatment of oral biofilm associated diseases – where we are -

Abstract from Håkon Valens lecture at symposium PDT-4. Human antimicrobial PDT. ESP-IUPB World Congress, Light & Life, Barcelona, Spain. August 25-30. 2019. Bacteria in the oral cavity lives primarily in polymicrobial biofilms. Oral mature biofilms may contain several hundred different bacterial species, and over 600 different species have been shown to colonize the oral cavity. […]

Antibacterial photodynamic therapy for treatment of oral biofilms related to periodontal and peri-implant diseases -

Abstract from Håkon Valens lecture at symposium MED-10 Dentistry. (Organized by Ellen Bruzell). ESP-IUPB World Congress, Light & Life, Barcelona, Spain. August 25-30. 2019. Oral biofilm formation around teeth and dental implants may cause inflammation of the surrounding tissue, which may lead to breakdown of the attachment of the tooth or implant. Ultimately, if left […]

Photostability of an anionic porphyrin in natural deep eutectic solvents (NADES) -

Abstract from Krister Grønliens lecture at symposium PDT-4. Human antimicriobial PDT. ESP-IUPB World Congress, Light & Life, Barcelona, Spain. August 25-30. 2019. Natural deep eutectic solvents (NADES) is a group of eutectics that is based solely on environmental-friendly (“Green”) components. These solvents have unique solubilizing properties; i.e. they are more polar than water but can […]

Light sources and light-dependent procedures in dentistry -

Abstract from Ellen Bruzells lecture at symposium MED-10 Dentistry. (Organized by Ellen Bruzell). ESP-IUPB World Congress, Light & Life, Barcelona, Spain. August 25-30. 2019. Dental personnel encounter a number of optical sources emitting a broad spectrum of wavelengths. Along with the usefulness, to various extents, of optical radiation in treatment and diagnostics, comes the risk […]

A comparison of Norwegian and overseas made dental metallic crowns -

The study revealed major deficiencies for both Norwegian and overseas made crowns regarding conformity between composition and the stated declaration

Influence of Fibrinogen on Staphylococcus epidermidis Adhesion Can Be Reversed by Tuning Surface Nanotopography -

Surface modifications in the nanoscale regime have shown promising potential in the combat against bacterial adhesion and colonization of surfaces. However, detailed knowledge of how the bacteria–substrate interactions occur is still limited.

Establishing a macrophage model with relevance for oral methacrylate monomer exposures: Attenuated Staphylococcus aureus-induced cytokine release from human macrophages -

Leakage of unpolymerized methacrylate monomers after placement of methacrylate-containing polymeric dental materials leads to human exposure. Based on studies using murine macrophages and LPS from Escherichia coli (E. coli), dental monomers like 2-hydroxyethyl methacrylate (HEMA) are known to inhibit lipopolysaccharide (LPS) induced cytokine release.

The frequency of enamel and dentin caries lesions among elderly Norwegians -

The article describe the distribution of enamel-, dentin-, root- and secondary caries within an elderly population in Northern-Norway.

Comparison of sandblasted, ground and melt-etched zirconia crowns regarding adhesion strength to resin cement -

The aim is to compare the adhesion between zirconia and cements attained with melt-etching with potassium hydrogen difluoride, KHF2, with that found when such traditional surface treatments as sandblasting and ceramic stone grinding are employed.

Treatment decisions regarding caries and dental developmental defects in children a questionnaire-based study among Norwegian dentists -

When dentists are treating children with dental caries or DDDs, they must decide the most appropriate treatment in each case. The results of the present study showed a notable disparity between clinician’s
treatment choices. In summary, the clinicians based their treatment choice mostly on patient cooperation, prognosis of the tooth and own experience. The results indicate that Norwegian dentists in PDS evaluate each case individually and base their decisions on what they consider is the best for the individual child.

An update on erosive tooth wear – prevalence, registration, etiology, genetic and treatment principles -

There is no standard treatment for damages caused by erosive tooth wear, and choice of treatment strategy should be determined on individual basis with emphasis on the minimal invasive intervention.

Réparation des restaurations défectueuses – Connaissances et attitudes thérapeutiques en France -

Résumé/implication clinique Le concept de réparation des restaurations défectueuses (plutôt que leur remplacement complet) fait partie des points clés de l’intervention minimale en cariologie. Cet article présente les résultats d’une enquête par questionnaire évaluant les attitudes cliniques et les connaissances en matière de prise en charge des restaurations défectueuses réalisée auprès d’une population de chirurgiens-dentistes […]

Prevention of snus use: Attitudes and activities in the Public Dental Service in the south‐eastern part of Norway -

Dental health care professionals have the opportunity to play a key role in tobacco prevention and cessation among adolescents. Snus use has increased in Norway, especially in the age group 16–24, whereas there has been a decline in smoking. This study investigated attitudes and activities related to snus prevention among dental health care professionals working in the Public Dental Service (PDS) in south‐eastern Norway.

Effect of methacrylated chitosan incorporated in experimental composite and adhesive on mechanical properties and biofilm formation -

The results of this study show that CH-MA (CH-MA) may be incorporated into a composite and into an adhesive to reduce biofilm formation on their surfaces. The mechanical properties of the composite were challenged, but flexural strength measurements still met the requirement set in ISO 4049, whereas no differences were observed for the bonding properties of the adhesives.

Thermal induced deflection of a porcelain–zirconia bilayer: Influence of cooling rate -

To determine the thermal expansion of a porcelain (VM9) and tetragonal zirconia (Y-TZP) as well as the deflection upon re-heating and cooling of a bilayer fabricated from these two materials after slow and rapid cooling during initial fabrication.

Bleaching of the Discolored Traumatized Tooth -

This chapter in “Textbook and Color Atlas of Traumatic Injuries to the teeth” focuses on the treatment of discolored traumatized teeth, most of them being non‐vital and subsequently, endodontically treated. Tooth bleaching based upon hydrogen peroxide as the active agent, applied directly or produced in a chemical reaction from sodium perborate or carbamide peroxide, must […]

Debonding mechanism of zirconia and lithium disilicate resin cemented to dentin -

To evaluate debonding mechanism of zirconia and lithium disilicate cemented to dentin mimicking what could occur in a clinical setting. A null hypothesis of no difference in tensile bond strength between groups of zirconia and lithium disilicate cemented with resin cements was also tested.

The dental monomer HEMA causes proteome changes in human THP‐1 monocytes -

Resin-based biomaterials are widely used in medical and dental treatment, and both clinicians and patients are exposed to the materials.
The present approach to analyzing the toxic potential of HEMA yielded information on interactions with living cells is not previously reported. This detailed information is of great value to make better predictions of possible side effects in the clinic.

Hvor god er du til å bestemme farge på restaureringene dine? -

Uttak av farge til fyllinger, kroner, broer og proteser av alle slag, er ofte en frustrerende øvelse. Men fortvil ikke, det ser ut til at de som praktiserer fargeuttak ofte og øver jevnlig, blir gode, uansett alder. Øvelse gjør mester

Peroxide-free tooth whitening products -

The purpose of this study was to compare the bleaching effects of peroxide-free and peroxide-containing tooth whitening products.
After 8 months, no perceivable lightening was noted for the peroxide-free products whereas the teeth treated with peroxide containing bleaching remained lightened.

Effect of methacrylated chitosan incorporated in experimental composite and adhesive on mechanical properties and biofilm formation. -

The results of this study show that methacrylated chitosan (CH-MA) may be incorporated into a composite and into an adhesive to reduce biofilm formation on their surfaces. The mechanical properties of the composite were challenged, but flexural strength measurements still met the requirement set in ISO 4049, whereas no differences were observed for the bonding properties of the adhesives.

The dental monomer 2-hydroxyethyl methacrylate (HEMA) causes transcriptionally regulated adaptation partially initiated by electrophilic stress -

The airways of dental personnel can be exposed to low concentrations of HEMA on a daily basis. Thus, we aimed to explore altered gene expression in a bronchial epithelial cell line after exposure to “non-lethal” concentrations of HEMA, demonstrated to be 2 mM or below in the current model system. We show that the expression of a number of genes was altered in HEMA exposed cells.

Opinions and Treatment Decisions for Dental Erosive Wear: A Questionnaire Survey among Icelandic Dentists -

Interest in dental erosive wear is increasing, and new recommendations of less invasive approaches to the treatment of the condition are emphasized. Therefore, the main objective of the present study was to identify dentists’ knowledge, beliefs, and clinical behaviour toward the condition. The present study is the first of its nature to analyze and permit comparison of the knowledge and treatment decisions of dental erosive wear between different countries, as it is conducted in a similar manner as the recent questionnaire study from Norway. The importance of making such intercountry assessments is high.

Bonding of Composite and Glass-ionomer to Amalgam -

Amalgam restorations of adequate standard and condition can very well be repaired with composite, but there should be provided for extra retention into the amalgam filling as the bond strength alone is not adequate. Glass-Ionomer may also be used for repair at amalgam restoration margins in not stress bearing areas, but as they do not adhere to amalgam, they need enamel and dentine for retention and possible undercuts towards amalgam interface.

Di-n-butyl phthalate modifies PMA-induced macrophage differentiation of THP-1 monocytes via PPARγ. -

The present study was part of the research project Inhalation and prenatal exposure to phthalates: influence on airway immunology, conducted at the Norwegian Institute of Public Health, and was funded by the Norwegian research council (Research grant number: 228129).

Digital evaluation of marginal and internal fit of single-crown fixed dental prostheses -

The adaptation of single-crown fixed dental prostheses (FDPs) is a subject of great interest in the research community. Many investigations have been published, and a variety of evaluation methods have been used to determine the fit accuracy of prosthetics.
Many of the methods required manual measurements of the gap between the restoration and the abutment. With the introduction of CAD/CAM techniques, digital tools started being used for evaluating the adaptation of FDPs.
In this study, a tabletop dental scanner was used. It is anticipated that in a clinical setting, an intraoral scanner is sufficient, at least for single-crown FDPs.

Biofilms and their properties -

Oral biofilm‐associated diseases, such as caries and periodontitis, represent global public health challenges. The diseases develop as a result of dysbiosis of the oral microbiome. There is a long tradition in medicine for treating bacterial infections by the use of antibiotics. Unfortunately, biofilm bacteria are significantly less sensitive to antibacterial agents than are their planktonic counterparts. This property of biofilm challenges us in our daily work as dentists, and might explain why many oral prophylactic agents predicted to be efficacious in vitro, only show marginal effect in vivo.

New animal model of extrinsic dental erosion-Erosive effect on the mouse molar teeth -

Human experiments on dental erosion are unethical because of the irreversible loss of dental hard tissues when exposed to acids. Therefore, studies using animal models are of high importance since they represent clinical situations. Based on the present results it can beconcluded that cola drink (phosphoric acid, pH=2.27) exhibited higher erosive effect on mouse mandibular molars compared to sports drink (citric acid, pH=3.39). This new animal model of extrinsic dental erosion where lesions of different severity can be created is suitable for further studies that will improve our understanding of the disease. The present method with transversely ground molars observed in SEM allows a registration of erosive lesions and lesion depths in small teeth like mouse molars. Both studies on the salivary influence (e.g. by using knockout mice) and the studies on the effect of fluoride on development of erosive lesions are warranted.

Optimizing quality and safety of dental materials -

Optimizing quality and safety of resin‐based materials need coherent strategies. Proper handling and polymerization increase the rate of conversion and thus minimize the content of residual monomers. Measures to reduce biofilm accumulation at the tooth‐restoration interface could prevent or reduce the most common reason for restoration failure, recurrent caries.

Preparation and characterization of Bis-GMA-free dental composites with dimethacrylate monomer derived from 9,9-Bis[4-(2-hydroxyethoxy)phenyl]fluorene. -

New dimethacrylate monomer Bis-EFMA was synthesized and used to prepare Bis-GMA-free dental resin and composite materials. Studies of the experimental materials showed that Bis-EFMA-based resin matrix and composite materials had improved properties compared to Bis-GMA-based resin matrix and composite materials, respectively. Compared with the commercial dental composite material Z250, Bis-EFMA-based composite showed similar or improved properties except for a lower FS after water immersion. Based on the presented results, Bis-EFMA has potential to be used in commercial dental composites.