Challenges in luting fibre posts: Adhesion to the post and to the dentine
The failure pattern of adhesively-luted fibre posts differs from that of metal posts: whereas fibre posts often fail due to debonding, metal posts often cause root fracture [1 –3]. Thus, debonding of adhesively-luted posts has been reported to represent 37% of all failure modes [4,5]. In order to minimize such failures, efficient adhesion to two distinct substrates is required: (1) to the surface of the post and (2) to the dentine of the root canal. (Source: Dental Materials)
Source: Dental Materials - May 1, 2018 Category: Materials Science Authors: Adriana Lemos Mori Ubaldini, Ana Raquel Benetti, Francielle Sato, Renata Corr êa Pascotto, Antonio Medina Neto, Mauro Luciano Baesso, Anne Peutzfeldt Source Type: research
Chemical interaction of glycero-phosphate dimethacrylate (GPDM) with hydroxyapatite and dentin
Although the functional monomer glycero-phosphate dimethacrylate (GPDM) has since long been used in several dental adhesives and more recently in self-adhesive composite cements and restoratives, its mechanism of chemical adhesion to hydroxyapatite (HAp) is still unknown. We therefore investigated the chemical interaction of GPDM with HAp using diverse chemical analyzers and ultra-structurally characterized the interface of a GPDM-based primer formulation with dentin. (Source: Dental Materials)
Source: Dental Materials - April 28, 2018 Category: Materials Science Authors: Kumiko Yoshihara, Noriyuki Nagaoka, Satoshi Hayakawa, Takumi Okihara, Yasuhiro Yoshida, Bart Van Meerbeek Source Type: research
Hygroscopic expansion of self-adhesive resin cements and the integrity of all-ceramic crowns
Low pH neutralization and subsequent remnant hydrophilicity can lead to hygroscopic expansion of self-adhesive resin cements (SARCs) after water storage. The aim of this in vitro study was to investigate the effects of hygroscopic expansion of SARCs, used as luting and partial core build-up material, on integrity and cement gap thickness increase of all-ceramic CAD/CAM crowns. (Source: Dental Materials)
Source: Dental Materials - April 27, 2018 Category: Materials Science Authors: Magdalena Kirsten, Ragai Edward Matta, Renan Belli, Ulrich Lohbauer, Manfred Wichmann, Anselm Petschelt, Jos é Zorzin Source Type: research
In vitro and in vivo studies of anti-bacterial copper-bearing titanium alloy for dental application
Titanium (Ti) and its alloys are extensively applied in clinic as preferred metallic medical materials due to their excellent combination of mechanical properties, corrosion resistance and biocompatibility [1]. However, titanium and its alloys are inert materials in biological environment, i.e., they have less bioactive functions, such as antimicrobial activity, promotion of osteogenesis, etc. [2]. It has been known that the adherence and colonization of bacteria on the surface of implants can lead to formation of biofilm, a firm layer composed of bacteria with the secreted glycoproteins and polysaccharides, which can caus...
Source: Dental Materials - April 27, 2018 Category: Materials Science Authors: Rui Liu, Yulong Tang, Lilan Zeng, Ying Zhao, Zheng Ma, Ziqing Sun, Liangbi Xiang, Ling Ren, Ke Yang Source Type: research
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(Source: Dental Materials)
Source: Dental Materials - April 26, 2018 Category: Materials Science Source Type: research
Does the size matter? Evaluation of effect of incorporation of silver nanoparticles of varying particle size on the antimicrobial activity and properties of irreversible hydrocolloid impression material
Irreversible hydrocolloid impression materials are widely used in dentistry to record preliminary impressions of dentulous and partially dentulous mouths. Traditionally, it is supplied as a powder comprising soluble alginate, calcium sulfate and sodium phosphate as primary reactive ingredients along with diatomaceous earth as filler. Upon mixing with water, gelation reaction occurs between soluble alginate and calcium sulfate leading to the formation of calcium alginate gel [1 –3]. (Source: Dental Materials)
Source: Dental Materials - April 26, 2018 Category: Materials Science Authors: Kishore Ginjupalli, Tushar Shaw, Chaitanya Tellapragada, Ramakrishna Alla, Lokendra Gupta, Nagaraja Upadhya Perampalli Source Type: research
Does translucency influence cure efficiency and color stability of resin-based composites?
To determine if material ’s translucency influences the cure efficiency and color stability of resin-based composites (RBCs). (Source: Dental Materials)
Source: Dental Materials - April 25, 2018 Category: Materials Science Authors: Vin ícius Esteves Salgado, Guilherme Ferreira Rego, Luis Felipe Schneider, Rafael Ratto de Moraes, Larissa Maria Cavalcante Source Type: research
FE analysis of conceptual hybrid composite endodontic post designs in anterior teeth
To assess conceptual designs of dental posts consisting of polyetherimide (PEI) reinforced with carbon (C) and glass (G) glass fibers in endodontically treated anterior teeth. (Source: Dental Materials)
Source: Dental Materials - April 24, 2018 Category: Materials Science Authors: Antonio Gloria, Saverio Maietta, Massimo Martorelli, Antonio Lanzotti, David C. Watts, Pietro Ausiello Source Type: research
Effect of hydration and crack orientation on crack-tip strain, crack opening displacement and crack-tip shielding in elephant dentin
The crack-resistance of dentin, as the major constituent of teeth and tusk, is a subject of considerable biomechanical interest. The resistance of a material to crack propagation (its fracture toughness) is related to intrinsic and extrinsic toughening mechanisms. Extrinsic toughening mechanisms operate primarily behind the crack tip by introducing crack-tip shielding, which reduces the local stress intensity actually experienced at the crack tip. Intrinsic toughening mechanisms operate ahead of the crack tip and contribute to the material's inherent resistance to crack growth [1]. (Source: Dental Materials)
Source: Dental Materials - April 21, 2018 Category: Materials Science Authors: Xuekun Lu, Shelley D. Rawson, Philip J. Withers Source Type: research
Antibacterial quaternary ammonium compounds in dental materials: A systematic review
Quaternary ammonium compounds (QACs) represent one of the most effective classes of disinfectant agents in dental materials and resin nanocomposites. This reviews aims to give a wide overview on the research in the field of antibacterial QACs in dental materials and nanocomposites. (Source: Dental Materials)
Source: Dental Materials - April 17, 2018 Category: Materials Science Authors: Pooyan Makvandi, Rezvan Jamaledin, Mostafa Jabbari, Nasser Nikfarjam, Assunta Borzacchiello Source Type: research
Antibacterial photocatalytic activity of different crystalline TiO2 phases in oral multispecies biofilm
Despite the evidence of excellent dental implant therapy results, peri-implant mucositis and peri-implantitis disease can still occur if pathogenic bacteria accumulate on the implant surface and its components, such as abutments [1]. While peri-implant mucositis is characterized by inflammatory soft tissue infiltrate around the implant, peri-implantitis presents signs of inflammation combined with bone loss around osseointegrated implants [2]. According to a recent meta-analysis study, the overall prevalence of peri-implant mucosistis can be as high as 43%, while peri-implantitis prevalence is around 22% [3]. (Source: Dental Materials)
Source: Dental Materials - April 17, 2018 Category: Materials Science Authors: Heloisa N. Pantaroto, Antonio P. Ricomini-Filho, Martinna M. Bertolini, Jos é H.D. Silva, Nilton F. Azevedo Neto, Cortino Sukotjo, Elidiane C. Rangel, Valentim A.R. Barão Source Type: research
Chairside CAD/CAM materials. Part 3: Cyclic fatigue parameters and lifetime predictions
Clinical indications of dental restorative materials are traditionally based on their mechanical strength, by relating experimental fracture loads to load ranges occurring intraorally. This concept is flawed in many aspects [1], yielding very arbitrary safety limits for clinical fracture. Also, ranking materials according to their strength as means to predict clinical performance disregards important underlying chemical and mechanical fatigue degradation processes that take place in the oral environment. (Source: Dental Materials)
Source: Dental Materials - April 17, 2018 Category: Materials Science Authors: Michael Wendler, Renan Belli, Diana Valladares, Anselm Petschelt, Ulrich Lohbauer Source Type: research
Correlation of ultrasound microscopy and Vickers hardness measurements of human dentin and enamel — A pilot study
To investigate if Vickers microhardness of dentin and enamel correlated with acoustic velocity c(l) or acoustic reflection from the sample ’s top (amplitude). (Source: Dental Materials)
Source: Dental Materials - April 17, 2018 Category: Materials Science Authors: Mareike Warkentin, Cora Freyse, Olaf Specht, Detlef Behrend, Reinhard Maletz, Ralf Janda, Peter Ottl Source Type: research
