Nano-graphene oxide incorporated into PMMA resin to prevent microbial adhesion
Polymethyl methacrylate (PMMA) has been clinically utilized for over 70 years as a biomaterial in the dental/medical fields for removable or implantable devices (e.g., denture base resin, provisional restorative materials, bone cement, facial prostheses) due to its desirable mechanical/biological properties, easy fabrication, and economic cost [1 –3]. However, its poor antimicrobial property still remains a major drawback that can cause infection when in contact with tissues or when being implanted for restoration [4,5]. (Source: Dental Materials)
Source: Dental Materials - February 2, 2018 Category: Materials Science Authors: Jung-Hwan Lee, Jeong-Ki Jo, Dong-Ae Kim, Kapil Dev Patel, Hae-Won Kim, Hae-Hyoung Lee Source Type: research
Predicting refractive index of fluoride containing glasses for aesthetic dental restorations
Dental restoration aesthetics, particularly the translucency of modern dental restorative filling materials depends on the refractive index (RI) match between the different components in the material. In the case of dental composites (DC), the RI of the polymer must match the RI of the filler otherwise the material is optically opaque and has limited depth of cure. In the case of glass ionomer cements (GICs), the RI of the ion-leachable glass must match the RI of the polysalts to engineer a smart material with a tooth-like appearance. (Source: Dental Materials)
Source: Dental Materials - February 2, 2018 Category: Materials Science Authors: Tomas Duminis, Saroash Shahid, Natalia G. Karpukhina, Robert G. Hill Source Type: research
Early responses of human pulp to direct capping with resin adhesive systems and calcium hydroxide
The most common clinical approach in treating caries lesions involves the mechanical removal of the caries-affected tooth structure and the restoration of the resulting cavity. In case of very deep caries lesions, the pulp can be exposed. In order to prevent pulp necrosis and stimulate healing, a capping material is applied over the exposed area. Highly alkaline calcium hydroxide has been established as the most efficient direct pulp capping agent, due to its beneficial properties (low cytotoxicity, antimicrobial action and dentin bridge induction) [1,2]. (Source: Dental Materials)
Source: Dental Materials - February 2, 2018 Category: Materials Science Authors: Anna Poimenova, Efthymia Kitraki, Afroditi Kakaboura, Christos Rahiotis Source Type: research
Optical properties of composite restorations influenced by dissimilar dentin restoratives
High esthetic requirements present a challenge in restorative dentistry due to the complex structure of dental tissues. This complexity is reflected in the specific micro-morphology, variable thickness, anisotropic and polychromatic nature as well as different composition of enamel and dentin [1,2]. The characteristic layout of enamel prisms and dentinal tubules and different amounts of organic substance cause differences in the optical parameters of these two tissues. Optical properties of contemporary composite restorations and natural teeth, despite differences in chemical composition and micro-structure, contribute to ...
Source: Dental Materials - February 2, 2018 Category: Materials Science Authors: Jovana Marjanovic, Djordje N. Veljovic, Jovana N. Stasic, Tatjana Savic-Stankovic, Branka Trifkovic, Vesna Miletic Source Type: research
Surface characteristics and biocompatibility of cranioplasty titanium implants following different surface treatments
This study aimed to investigate the effects of titanium finishing protocols on the surface morphology, hardness and biocompatibility of TiAl6V4. (Source: Dental Materials)
Source: Dental Materials - February 1, 2018 Category: Materials Science Authors: Muhanad M. Hatamleh, Xiaohong Wu, Ahmad Alnazzawi, Jason Watson, David Watts Source Type: research
Optimization of large MOD restorations: Composite resin inlays vs. short fiber-reinforced direct restorations
Techniques for restoring anterior or posterior teeth include direct, semi-direct, semi-indirect and indirect restorations [1]. Large direct restorations present several challenges, especially in the posterior dentition. Mastering of shape, contours and occlusal anatomy/function requires particular skills [2,3]. But it also raises the problem of polymerization shrinkage [4,5]. Contraction stresses challenge the dentin –resin hybrid layer and may result in gap formation and/or decreased dentin bond strength [4,6]. (Source: Dental Materials)
Source: Dental Materials - January 22, 2018 Category: Materials Science Authors: Luciana Mara Soares, Mehrdad Razaghy, Pascal Magne Source Type: research
Mechanical properties and fracture behavior of flowable fiber reinforced composite restorations
The aim was to evaluate the effect of short glass-fiber/filler particles proportion on fracture toughness (FT) and flexural strength (FS) of an experimental flowable fiber-reinforced composite (Exp-SFRC) with two methacrylate resin formulations. In addition, we wanted to investigate how the fracture-behavior of composite restorations affected by FT values of SFRC-substructure. (Source: Dental Materials)
Source: Dental Materials - January 22, 2018 Category: Materials Science Authors: Lippo Lassila, Filip Keulemans, Eija S äilynoja, Pekka K. Vallittu, Sufyan Garoushi Source Type: research
Strength and fracture toughness of zirconia dental ceramics
Before examining the strength and fracture toughness of dental ceramics, some basic concepts of fracture mechanics, strength and testing of ceramic materials are introduced in this section. (Source: Dental Materials)
Source: Dental Materials - January 21, 2018 Category: Materials Science Authors: Miquel Turon-Vinas, Marc Anglada Source Type: research
In memoriam of Professor David B. Mahler (1923 –2017)
Dr. David B. Mahler, Professor Emeritus in the Division of Biomaterials and Biomechanics and Department of Restorative Dentistry at the Oregon Health& Science University, Portland, OR, died August 2, 2017 at the age of 94. (Source: Dental Materials)
Source: Dental Materials - January 18, 2018 Category: Materials Science Tags: Obituary Source Type: research
Wear of polyetherketoneketones — Influence of titanium dioxide content and antagonistic material
The aim of this laboratory study was to analyze the influence of titanium dioxide (TiO2) content and antagonistic material on the wear of polyetherketoneketones (PEKKs). (Source: Dental Materials)
Source: Dental Materials - January 18, 2018 Category: Materials Science Authors: Thomas Kewekordes, Sebastian Wille, Matthias Kern Source Type: research
Genotoxic and mutagenic potential of camphorquinone in L5178/TK+/ − mouse lymphoma cells
Camphorquinone (CQ) is the most important photoinitiator used in dental composite resins. Sparse data indicate a mutagenic potential of CQ. Therefore, it was aim of this study to evaluate the cytotoxicity, genotoxicity, and mutagenicity of CQ in L5178Y TK+/ − mouse lymphoma cells. (Source: Dental Materials)
Source: Dental Materials - January 18, 2018 Category: Materials Science Authors: J. Volk, C. Ziemann, G. Leyhausen, W. Geurtsen Source Type: research
In-vitro wear of natural tooth surface opposed with zirconia reinforced lithium silicate glass ceramic after accelerated ageing
Dental ceramics are generally considered chemically inert restorative materials. However, many factors may influence the durability of dental ceramics. Different ceramic compositions and microstructures are exposed to different environmental factors such as the presence of erosive or acidic agents. The latter are caused by ingestion of certain fruits or beverages, inhalation of industrial acidic fumes or gastric juice regurgitated into the oral cavity as in the case of bulimia and anorexia nervosa. (Source: Dental Materials)
Source: Dental Materials - January 18, 2018 Category: Materials Science Authors: Salma M. Fathy, Michael V. Swain Source Type: research
Crystallographic and morphological analysis of sandblasted highly translucent dental zirconia
Zirconia-based restorations are now frequently applied in dentistry, thanks to their esthetics, biocompatible properties, easier and even cheaper fabrication as compared to the conventional porcelain-fused-to-metal (PFM) restorations [1,2]. Since 2014, more esthetic highly-translucent zirconia has been introduced into dentistry. According to Makhija et al., full-contour restorations made by highly translucent zirconia are becoming the first choice to restore posterior teeth in the US [3]. (Source: Dental Materials)
Source: Dental Materials - January 8, 2018 Category: Materials Science Authors: Masanao Inokoshi, Haruki Shimizu, Kosuke Nozaki, Tomohiro Takagaki, Kumiko Yoshihara, Noriyuki Nagaoka, Fei Zhang, Jozef Vleugels, Bart Van Meerbeek, Shunsuke Minakuchi Source Type: research
Precision of 655nm Confocal Laser Profilometry for 3D surface texture characterisation of natural human enamel undergoing dietary acid mediated erosive wear
Human enamel has a complex hierarchal microstructure, constituting 96% mineral, 3% water and 1% organic protein [1]. The mineral content is a hydroxyapatite, sometimes referred to as a calcium deficient hydroxyapatite (HA) due to the constant dynamic flux of metal ions occurring with the oral environment [2,3]. Prior to tooth eruption, secretory ameloblasts form the fundamental microstructural unit of enamel. The enamel rod or prism, runs from the edge of the inner dentine to the outer enamel surface, having only 3 –7μm diameter whilst up to 4mm length, with each prism interlocked by an organic protein complex [1,4]. (S...
Source: Dental Materials - January 6, 2018 Category: Materials Science Authors: F. Mullan, P. Mylonas, C. Parkinson, D. Bartlett, R.S. Austin Source Type: research
Development of layered PLGA membranes for periodontal tissue regeneration
Guided tissue regeneration (GTR) is a clinical approach for periodontal tissue regeneration by guiding periodontal ligament-derived cells and osteoblasts following application of a barrier membrane to the periodontal tissue defect [1,2]. The membranes used in GTR therapy are classified into two types: biodegradable (including animal origin constituents [3 –5] and polylactic acid (PLA) [6–8]) and non-biodegradable (including polytetrafluoroethylene (PTFE) and titanium) [9–11]. (Source: Dental Materials)
Source: Dental Materials - January 5, 2018 Category: Materials Science Authors: Itsumi Yoshimoto, Jun-Ichi Sasaki, Ririko Tsuboi, Satoshi Yamaguchi, Haruaki Kitagawa, Satoshi Imazato Source Type: research
