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Clinical Oral Investigations Mar 2008In vitro and in vivo studies have clearly identified that some components of restorative composite resins, adhesives, and resin-modified glass ionomer cements are toxic.... (Review)
Review
In vitro and in vivo studies have clearly identified that some components of restorative composite resins, adhesives, and resin-modified glass ionomer cements are toxic. The mechanisms of cytotoxicity are related firstly to the short-term release of free monomers occurring during the monomer-polymer conversion. Secondly, long-term release of leachable substances is generated by erosion and degradation over time. In addition, ion release and proliferation of bacteria located at the interface between the restorative material and dental tissues are also implicated in the tissue response. Molecular mechanisms involve glutathione depletion and reactive oxygen species (ROS) production as key factors leading to pulp or gingival cell apoptosis. Experimental animal approaches substantiate the occurrence of allergic reactions. There is a large gap between the results published by research laboratories and clinical reports.
Topics: Adhesives; Animals; Composite Resins; Dental Materials; Humans; Materials Testing; Resin Cements; Resins, Synthetic
PubMed: 18040729
DOI: 10.1007/s00784-007-0162-8 -
Lasers in Medical Science Sep 2011The aim of this study was to investigate the effect of power density and irradiation time of an argon laser on the physico-mechanical properties of light-cured dental...
The aim of this study was to investigate the effect of power density and irradiation time of an argon laser on the physico-mechanical properties of light-cured dental nanocomposites. The composites were cured with 260 mW/cm(2) and 340 mW/cm(2) power densities at different irradiation times. The degree of conversion (DC), flexural strength, flexural modulus, water sorption, solubility and reaction temperature were measured. The maximum DC (50%), which was achieved after approximately 20 s irradiation, and the reaction temperature rise (20°C) were demonstrated by composite containing 20% filler cured at 340 mW/cm(2). The composite with 25% filler cured at 340 mW/cm(2) showed the highest flexural strength and modulus, which were 32.2 MPa and 1.89 GPa, respectively. The minimum water sorption (3.8%) and solubility (1.2%) were achieved with the composite containing 25% filler cured at 340 mW/cm(2). Finally, the composite with 25% filler cured at 340 mW/cm(2) showed higher physico-mechanical properties.
Topics: Composite Resins; Curing Lights, Dental; Dental Materials; Dental Restoration, Permanent; Elastic Modulus; Humans; Lasers, Gas; Materials Testing; Nanocomposites; Photochemical Processes; Solubility; Spectroscopy, Fourier Transform Infrared; Surface Properties; Temperature
PubMed: 19618232
DOI: 10.1007/s10103-009-0699-7 -
Medical Science Monitor : International... May 2018BACKGROUND Polymer-infiltrated ceramic-network (PICN) dental material is a new and practical development in orthodontics. Sintering is the process of forming a stable...
Effects of Ceramic Density and Sintering Temperature on the Mechanical Properties of a Novel Polymer-Infiltrated Ceramic-Network Zirconia Dental Restorative (Filling) Material.
BACKGROUND Polymer-infiltrated ceramic-network (PICN) dental material is a new and practical development in orthodontics. Sintering is the process of forming a stable solid mass from a powder by heating without melting. The aim of this study was to evaluate the effects of sintering temperature on the mechanical properties of a PICN zirconia dental material. MATERIAL AND METHODS A dense zirconia ceramic and four PICN zirconia dental materials, with varying porosities, were sintered at three different temperatures; 12 PICN zirconia dental materials based on these porous ceramics were prepared, as well as a pure polymer. After the specimen preparation, flexural strength and elastic modulus values were measured using the three-point bending test, and fracture toughness were determined by the single-edge notched beam (SENB) method. The Vickers hardness test method was used with an indentation strength (IS) test. Scanning electron microscopy (SEM) was used to examine the microstructure of the ceramic surface and the fracture surface. RESULTS Mechanical properties of the PICN dental materials, including flexural strength, elastic modulus, fracture toughness, and hardness, were more similar to the properties of natural teeth when compared with traditional dental ceramic materials, and were affected by the density and sintering temperature. SEM showed that the porous ceramic network became cohesive and that the length of cracks in the PICN dental material was reduced. CONCLUSIONS PICN zirconia dental materials were characterized by similar mechanical properties to natural dental tissues, but further studies are required continue to improve the similarities with natural human enamel and dentin.
Topics: Dental Materials; Dental Porcelain; Dental Stress Analysis; Elastic Modulus; Hardness; Materials Testing; Polymers; Porosity; Stress, Mechanical; Temperature; Zirconium
PubMed: 29746449
DOI: 10.12659/MSM.907097 -
Journal of Biomedical Materials Research 1971
Topics: Acrylic Resins; Dental Amalgam; Dental Materials; Dental Restoration, Permanent; Glass; Humans; Microscopy, Electron, Scanning; Resins, Plant; Silicate Cement; Surface Properties; Tooth Abrasion
PubMed: 5575326
DOI: 10.1002/jbm.820050219 -
Biomaterials Science Jun 2018Cyanoacrylate adhesives and their homologues have elicited interest over the past few decades owing to their applications in the biomedical sector, extending from tissue... (Review)
Review
Cyanoacrylate adhesives and their homologues have elicited interest over the past few decades owing to their applications in the biomedical sector, extending from tissue adhesives to scaffolds to implants to dental material and adhesives, because of their inherent biocompatibility and ability to polymerize solely with moisture, thanks to which they adhere to any substrate containing moisture such as the skin. The ability to tailor formulations of alkyl cyanoacrylate to form derivative compounds to meet application requirements along with their biodegradability in conjunction with their inherent biocompatibility make them highly sought after candidates in the biomedical sector. There has been extensive exploration of cyanoacrylate adhesives and their homologue systems in biomedical applications, but no consolidated literature of the vast data is available. The ability of cyanoacrylate adhesives to cure at low temperatures and without the need for any hardener, which is attributed to the high-strength bonding interaction between two non-amalgamating substrates, with their ease of dispersion and self-curing, avoids the curtailing of the effective utilization of such adhesives in biomedical engineering applications as bio glues for amalgamating tissues, implants, scaffolds etc. This article consolidates copious work on cyanoacrylate adhesives and their derived systems which are functional in versatile biomedical engineering applications such as bio glues, dental material and adhesives and other potential applications.
Topics: Adhesives; Animals; Biocompatible Materials; Cyanoacrylates; Dental Materials; Drug Delivery Systems; Humans; Prostheses and Implants; Tissue Adhesives; Tissue Engineering; Tissue Scaffolds
PubMed: 29786707
DOI: 10.1039/c8bm00312b -
Journal of the National Medical... Jun 2018The purpose of this study was to evaluate the two-body wear resistances of natural enamel and four dental materials in vitro.
INTRODUCTION
The purpose of this study was to evaluate the two-body wear resistances of natural enamel and four dental materials in vitro.
METHODS
The testing machine was modified to form a type of pin-on-disk wear test apparatus. Four dental material specimens (Au-Pd alloy, Ag-Pd alloy, FiltekTMP60 and FiltekTMZ350 composite resins) and enamel were used as the pins, and a steatite ceramic grinding wheel was used as the abrasive counter face. The wear volume loss and the rigidity value was measured. The worn surface and the element analysis of the debris were analyzed.
RESULT
The wear volume loss of Au-Pd alloy and its steatite antagonists were the nearest to those of the dental enamel. SEM microphotographs showed that, the main wear mechanism of the dental materials was abrasive and adhesive wear.
CONCLUSIONS
Au-Pd alloy had good wear resistance and was more suitable for dental applications than other three dental materials.
Topics: Composite Resins; Dental Alloys; Dental Enamel; Dental Materials; Dental Restoration Wear; Humans; Materials Testing; Surface Properties
PubMed: 29778127
DOI: 10.1016/j.jnma.2017.05.009 -
Tidsskrift For Den Norske Laegeforening... May 2000
Review
Topics: Dental Materials; Dermatitis, Allergic Contact; Humans; Patch Tests; Stomatitis
PubMed: 10970233
DOI: No ID Found -
Zhonghua Kou Qiang Yi Xue Za Zhi =... Sep 2016The mode of dental antibacterial resin-based materials can be divided into two types, namely, single and combined antibacterial mode. With regard to single antibacterial... (Review)
Review
The mode of dental antibacterial resin-based materials can be divided into two types, namely, single and combined antibacterial mode. With regard to single antibacterial mode, only one kind of antibacterial agent is added into the resin, which can be released or act as contacting antibacterial agent. The single mode resin has limitation in sterilization methods and effect. As for combined antibacterial mode, it is a combination of different types of biocides and thus maximizes the sterilizing effect, including the releasing antibacterial agent incorporated with the contacting antibacterial agent or antibacterial agents combined with calcium compound possessing biological mineralization function. In this paper, current status and further prospects of dental resin-based materials with antibacterial properties are reviewed from the perspectives of single and combined antibacterial modes to provide guidance for dental antibacterial resin material research.
Topics: Anti-Bacterial Agents; Composite Resins; Dental Materials; Materials Testing; Resins, Synthetic
PubMed: 27596349
DOI: 10.3760/cma.j.issn.1002-0098.2016.09.012 -
Colloids and Surfaces. B, Biointerfaces Jun 2020Dental materials are susceptible to dental plaque formation, which increases the risk of biofilm-associated oral diseases. Physical-chemical properties of dental...
Dental materials are susceptible to dental plaque formation, which increases the risk of biofilm-associated oral diseases. Physical-chemical properties of dental material surfaces can affect salivary pellicle formation and bacteria attachment, but relationships between these properties have been understudied. We aimed to assess the effects of surface properties and adsorbed salivary pellicle on Streptococcus gordonii adhesion to traditional dental materials. Adsorption of salivary pellicle from one donor on gold, stainless steel, alumina and zirconia was monitored with a quartz crystal microbalance with dissipation monitoring (QCM-D). Surfaces were characterized by X-ray photoelectron spectroscopy, atomic force microscopy and water contact angles measurement before and after pellicle adsorption. Visualization and quantification of Live/Dead stained bacteria and scanning electron microscopy were used to study S. gordonii attachment to materials with and without pellicle. The work of adhesion between surfaces and bacteria was also determined. Adsorption kinetics and the final thickness of pellicle formed on the four materials were similar. Pellicle deposition on all materials increased surface hydrophilicity, surface energy and work of adhesion with bacteria. Surfaces with pellicle had significantly more attached bacteria than surfaces without pellicle, but the physical-chemical properties of the dental material did not significantly alter bacteria attachment. Our findings suggested that the critical factor increasing S. gordonii attachment was the salivary pellicle formed on dental materials. This is attributed to increased work of adhesion between bacteria and substrates with pellicle. New dental materials should be designed for controlling bacteria attachment by tuning thickness, composition and structure of the adsorbed salivary pellicle.
Topics: Adsorption; Anti-Bacterial Agents; Chemistry, Physical; Dental Materials; Dental Pellicle; Humans; Microbial Sensitivity Tests; Particle Size; Streptococcus gordonii; Surface Properties
PubMed: 32172164
DOI: 10.1016/j.colsurfb.2020.110938 -
Dento Maxillo Facial Radiology Sep 2022The purpose of this systematic review was to search in literature in which severity unintended effects are caused by dental materials in magnetic resonance imaging...
OBJECTIVES
The purpose of this systematic review was to search in literature in which severity unintended effects are caused by dental materials in magnetic resonance imaging (MRI), such as to evaluate whether these artifacts hamper the diagnosis in the head and neck region.
MATERIALS AND METHODS
Clinical studies showing the severity of artifacts which dental materials are capable of causing in MRI of head and neck, such as their influence on diagnostic accuracy, were included in this review. The searches were conducted in four electronic databases (PubMed/Medline, Embase, Scopus and Web of Science), and a manual search was made in the reference lists of papers screened for full-text reading. Risk of bias was assessed using "Quality Assessment Tool for Diagnostic Accuracy Studies-2" (QUADAS-2). The Grading of Recommendations Assessment, Development, and Evaluation (GRADE) was used to assess the quality of evidence.
RESULTS
From 151 studies selected for full-reading, 19 were considered eligible for this review. Artifacts caused by orthodontic appliances were well-documented, and stainless steel brackets were the materials most likely to cause artifacts in MR imaging of head and neck. The literature was scarce for dental implants and restorations. Diagnoses within the oral cavity, but also those of the brain and craniofacial structures, were affected.
CONCLUSION
Artifacts caused by orthodontic appliances may affect the diagnosis in oral cavity and craniofacial structures. Data regarding dental implants and prosthodontics restorations were inconclusive. The severity of artifacts in MRI and their influence on diagnosis is dependent on dental material features, location in the oral cavity, and magnetic resonance parameters.
Topics: Artifacts; Dental Implants; Dental Materials; Humans; Magnetic Resonance Imaging; Mouth; Orthodontic Appliances
PubMed: 35348371
DOI: 10.1259/dmfr.20210450