On the systematic documentation of the structural characteristics of bovine enamel: A critic to the protein sheath concept
The common structural description of bovine enamel used in materials science studies – nano-sized hydroxyapatite crystallites form micron-sized prisms surrounded by protein sheaths, which in turn build a complex decussation pattern – overlook many important morphological information. This hampers the correct interpretation of the data determined by mechanical analysis. For a pro found structural description of enamel morphology, the visualization of its building blocks by high-resolution electron microscopy and focused-ion beam tomography technique, which reveals their form, orientation and configuration at different r...
Source: Dental Materials - June 26, 2018 Category: Materials Science Authors: Ezgi D. Yilmaz, Jasmin Koldehoff, Gerold A. Schneider Source Type: research
Impact of crystallization firing process on the microstructure and flexural strength of zirconia-reinforced lithium silicate glass-ceramics
The constant search for all-ceramic restorative materials that combine aesthetics and strength has contributed to the development of reinforced glass-ceramics [i.e., zirconia-reinforced lithium silicate (ZLS) glass-ceramics] by the companies Vita and Dentsply, in conjunction with the Fraunhofer Institute for Silicate Research (Germany), and marketed separately as different products, i.e., Vita Suprinity (Vita) and Celtra Duo (Dentsply) [1,2]. Both ZLS glass-ceramics are indicated for inlays, onlays, full-contour anterior and posterior crowns, and also for implant-supported prostheses [3,4]. (Source: Dental Materials)
Source: Dental Materials - June 23, 2018 Category: Materials Science Authors: Hilton Riquieri, Jaiane Bandoli Monteiro, Diogo Cabecinha Viegas, Tiago Moreira Bastos Campos, Renata Marques de Melo, Guilherme de Siqueira Ferreira Anzaloni Saavedra Source Type: research
Should adhesive debonding be simulated for intra-radicular post stress analyses?
Computational stress analyses of intra-radicular restorations sometimes seem to contradict in vitro and clinical studies. A meta-analysis of in vitro studies evaluating roots restored with metal or fiber posts showed higher fracture strengths with metal posts [1]. However, several clinical systematic reviews that compared intra-radicular restorations showed inconclusive or contradictory results [2 –8]. Some finite element analyses (FEA) showed lower stress values for fiber post restorations while others have suggested similar stress values regardless of post material [9–11]. (Source: Dental Materials)
Source: Dental Materials - June 23, 2018 Category: Materials Science Authors: Ricardo A. Caldas, Atais Bacchi, Valentim A.R. Bar ão, Antheunis Versluis Source Type: research
Correlation of resin viscosity and monomer conversion to filler particle size in dental composites
The viscosity of dental resin composites is important in their formulation and clinical use; it depends on the filler particle size and loading. We intend to study the viscosity and conversion of composites made of low dispersity spherical silica fillers. (Source: Dental Materials)
Source: Dental Materials - June 22, 2018 Category: Materials Science Authors: Eric Habib, Ruili Wang, X.X. Zhu Source Type: research
Experimental tricalcium silicate cement induces reparative dentinogenesis
Calcium hydroxide has long been considered as the gold standard for pulp capping [1 –3]. Lately, the most well-known and most intensively investigated hydraulic calcium silicate cements (hCSCs), often referred to as MTA (mineral trioxide aggregate), have demonstrated a superior performance than calcium hydroxide with regard to inducing less pulpal inflammation and generating more predictably a hard-tissue barrier or so-called dentin bridge [4–6]. Nevertheless, some major drawbacks of hCSCs remain a concern, such as their relatively difficult handling [7,8], long setting time [9], release of heavy metal elements [10], a...
Source: Dental Materials - June 22, 2018 Category: Materials Science Authors: Xin Li, Mariano Sim ón Pedano, Bernardo Camargo, Esther Hauben, Stéphanie De Vleeschauwer, Zhi Chen, Jan De Munck, Katleen Vandamme, Kirsten Van Landuyt, Bart Van Meerbeek Source Type: research
In vitro degradation of a biodegradable polylactic acid/magnesium composite as potential bone augmentation material in the presence of titanium and PEEK dental implants
The aim of this study was to assess the degradation behavior by measuring the H2 release of a biodegradable composite consisting of a polylactic acid matrix reinforced with 30% wt. spherical magnesium microparticles (PLA/Mg) as potential bone augmentation material in combination with dental implants of either titanium or polyetheretherketone (PEEK) in order to evaluate the potential influence of the titanium dental implants on the corrosion behavior of the Mg particles within the PLA matrix. (Source: Dental Materials)
Source: Dental Materials - June 22, 2018 Category: Materials Science Authors: Tycho Zimmermann, Ana Ferrandez-Montero, Marcela Lieblich, Bego ña Ferrari, José Luis González-Carrasco, Wolf-Dieter Müller, Andreas Dominik Schwitalla Source Type: research
Post-curing in dental resin-based composites
A paradigm shift in the field of dentistry occurred with the introduction of photo-cured resin-based composites (RBCs) as an alternative to amalgam in dental restorations [1 –3]. The main driving force is that the restored teeth can look like a natural decay free tooth. Due to the fundamental nature of the resin used in RBCs, after photo-curing, polymerization-induced shrinkage strain develops with time. This produces shrinkage-induced stress within the cavity walls o f the teeth [4]. There is evidence that such stresses may result in enamel cracking and tooth post-operative pain [5], margin debonding [6], secondary cari...
Source: Dental Materials - June 22, 2018 Category: Materials Science Authors: William Germscheid, Louis Gosse de Gorre, Braden Sullivan, Catherine O ’Neill, Richard B. Price, Daniel Labrie Source Type: research
An analytical model to design circumferential clasps for laser-sintered removable partial dentures
Removable partial dentures (RPDs) are essential cost-effective components of the dental prosthesis industry. They are used to restore missing teeth in partially edentulous patients, improving their quality of life. Millions of patients are affected by this treatment worldwide; over 13% of the adult population in North America and Europe wear RPDs [1]. (Source: Dental Materials)
Source: Dental Materials - June 21, 2018 Category: Materials Science Authors: Ammar A. Alsheghri, Omar Alageel, Eric Caron, Ovidiu Ciobanu, Faleh Tamimi, Jun Song Source Type: research
Effect of an acidic sodium salt on the polymerization behavior of self-adhesive resin cements formulated with different adhesive monomers
To determine the influence of benzenesulfinic acid sodium salt 98% (BAS) and the activation mode on the polymerization behavior of experimental self-adhesive resin cements (SARCs) formulated with distinct self-etch methacrylates. (Source: Dental Materials)
Source: Dental Materials - June 21, 2018 Category: Materials Science Authors: Pedro Paulo Albuquerque Cavalcanti de Albuquerque, Ezequias Costa Rodrigues, Luis Felipe Schneider, Rafael Ratto Moraes, Paulo Francisco Cesar, Leonardo Eloy Rodrigues Filho Source Type: research
Endocrown restorations: Influence of dental remnant and restorative material on stress distribution
Due to the complexity of rehabilitating endodontically treated teeth, several systems have emerged and have been developed in an attempt to recover function and aesthetics. In cases of great tooth structure loss, post-retained restorations are widely used [1]. Among those, prefabricated fiberglass posts have received considerable attention in the scientific literature [2 –4], industry, and clinicians’ routines due to their advantages such as: aesthetics, homogeneous stress distribution due to their elastic modulus similar to that of dentin [5], ease of handling, and proven clinical success. (Source: Dental Materials)
Source: Dental Materials - June 20, 2018 Category: Materials Science Authors: Jo ão Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Camila Ferreira Leite Madruga, Marcia Carneiro Valera, Alexandre Luiz Souto Borges, Eduardo Bresciani, Renata Marques de Melo Source Type: research
Influence of different low-pressure plasma process parameters on shear bond strength between veneering composites and PEEK materials
The aim of this study was to evaluate the impact of oxygen and argon/oxygen low-pressure plasma on the shear bond strength (SBS) between dental PEEK compounds and veneering composites as a function of plasma process time. (Source: Dental Materials)
Source: Dental Materials - June 20, 2018 Category: Materials Science Authors: Friederike B ötel, Tycho Zimmermann, Mona Sütel, Wolf-Dieter Müller, Andreas Dominik Schwitalla Source Type: research
Influence of fluoride on the mineralization of collagen via the polymer-induced liquid-precursor (PILP) process
Because of the short longevity of commonly used restorations, researchers are exploring biomimetic methods to restore less damaged areas of carious lesions to their natural state. While some success has been achieved for enamel repair, dentin remineralization poses a unique challenge given the large component of organic matrix [1 –9]. In our prior report, when the polymer-induced liquid-precursor (PILP) process was used to remineralize artificial dentin caries, full apatitic mineral density recovery was obtained as determined by micro-x-ray computed tomography analysis (μ-CT) and similar nanostructures to native dentin ...
Source: Dental Materials - June 20, 2018 Category: Materials Science Authors: Neha Saxena, Maegan A. Cremer, Evan S. Dolling, Hamid Nurrohman, Stefan Habelitz, Grayson W. Marshall, Laurie B. Gower Source Type: research
Novel magnetic nanoparticle-containing adhesive with greater dentin bond strength and antibacterial and remineralizing capabilities
The objectives of this study were to: (1) develop a magnetic nanoparticle-containing adhesive with dimethylaminohexadecyl methacrylate (DMAHDM), amorphous calcium phosphate nanoparticles (NACP) and magnetic nanoparticles (MNP); and (2) investigate the effects on dentin bond strength, calcium (Ca) and phosphate (P) ion release and anti-biofilm properties. (Source: Dental Materials)
Source: Dental Materials - June 20, 2018 Category: Materials Science Authors: Yuncong Li, Xiaoyi Hu, Yang Xia, Yadong Ji, Jianping Ruan, Michael D. Weir, Xiaoying Lin, Zhihong Nie, Ning Gu, Radi Masri, Xiaofeng Chang, Hockin H.K. Xu Source Type: research
Fatigue behavior of ultrafine tabletop ceramic restorations
The goal of this study was to investigate the fatigue life, failure modes, and stress distribution of partial ultrafine restorations for posterior teeth in different ceramics. (Source: Dental Materials)
Source: Dental Materials - June 19, 2018 Category: Materials Science Authors: F.O. Abu-Izze, G.F. Ramos, A.L.S. Borges, L.C. Anami, M.A. Bottino Source Type: research
Effect of thiourethane filler surface functionalization on stress, conversion and mechanical properties of restorative dental composites
Despite the low annual failure rates (1 –3%) observed for composite restorations in posterior teeth, with most failures observed being related to secondary caries and fractures of the tooth structure or restorative materials, on average, restorations last about 10 years in service [1–3]. Secondary caries is significantly affected by r isk factors associated to the patients [4–6], but the presence of defects at the restoration margins can increase the likelihood of bacterial recolonization and reestablishment of the disease in the region [7–9]. (Source: Dental Materials)
Source: Dental Materials - June 19, 2018 Category: Materials Science Authors: Andr é L. Faria-e-Silva, Andressa dos Santos, Angela Tang, Emerson M. Girotto, Carmem S. Pfeifer Source Type: research
