Intracoronal stress transfer through enamel following RBC photopolymerisation: A synchrotron X-ray study
Dental resin based composite materials exhibit a volumetric shrinkage associated with polymerisation that, when constrained by adhesion to the tooth cavity walls, leads to the generation of shrinkage stresses within the tooth-composite complex. Shrinkage stresses have been measured directly in-vitro and it has been identified that the magnitude and kinetics of their development are dependent on a number of factors, including in particular, the composite composition and resin chemistry [1,2], photo-polymerisation variables [3 –5] and the terminal degree of monomer to polymer conversion [6–8]. (Source: Dental Materials)
Source: Dental Materials - August 14, 2018 Category: Materials Science Authors: Maisoon Al-Jawad, Owen Addison, Slobodan Sirovica, Samera Siddiqui, Richard A. Martin, David J. Wood, David C. Watts Source Type: research
Prof. Dr. Werner J. Finger
On Wednesday, June 20, 2018, Prof. Dr. Werner J. Finger passed away in Hanover. (Source: Dental Materials)
Source: Dental Materials - August 2, 2018 Category: Materials Science Authors: Markus Balkenhol Tags: Obituary Source Type: research
Prof. Dr. Dr. Werner J. Finger
On Wednesday, June 20, 2018, Prof. Dr. Dr. Werner J. Finger passed away in Hanover. (Source: Dental Materials)
Source: Dental Materials - August 2, 2018 Category: Materials Science Authors: Markus Balkenhol Tags: Obituary Source Type: research
Effect of sandblasting, etching and resin bonding on the flexural strength/bonding of novel glass-ceramics
Leucite (KAlSi2O6) glass-ceramics are desirable for the fabrication of dental restorations due to their excellent aesthetic properties, which simulate natural tooth appearance and their low cytotoxicity [1]. The high thermal expansion coefficient of tetragonal leucite (20.5 ×10−6/°C) [2], makes it a useful component in veneering materials for high strength metal-ceramic restorations [3]. Leucite glass-ceramics can also be fabricated into a variety of all-ceramic restorations adhesively bonded to dentine–enamel tooth structure [4,5], and encouraging a more conserv ative tooth preparation [6]. (Source: Dental Materials)
Source: Dental Materials - August 1, 2018 Category: Materials Science Authors: Chinwe O. Uwalaka, Natalia Karpukhina, Xu Cao, Sami Bissasu, Rory M. Wilson, Michael J. Cattell Source Type: research
Guest Editorial: The red rag of imprecision
Much is said about the quality of research and the ways in which this affects the process of publication. Indeed, much advice is offered on how to write grant applications, abstracts and papers, often by editors and referees who understandably get fed up with bad structure, inadequate experimental design [1], bad syntax and spelling, illogical inferences and rambling, unfocused discussion. I do not need to rehearse the unpalatable truths yet again here [2]. Instead, I should like to address a small sample of recurrent complaints arising from papers that I have both read in a variety of dental journals and reviewed. (Source: Dental Materials)
Source: Dental Materials - August 1, 2018 Category: Materials Science Authors: Brian W. Darvell Tags: Editorial Source Type: research
Fatigue behavior and crack initiation of CAD/CAM resin composite molar crowns
Computer-aided design/computer-aided manufacturing (CAD/CAM) resin composite blocks (RCBs) containing a high density of nano-filler particles are available for use in posterior restorations [1]. Because of the preliminary polymerized resin matrix, the nano-filler particles are homogeneously dispersed in the resin matrix, providing stable and excellent mechanical properties such as flexural strength and fracture toughness when compared with those of conventional resin composites used in fillings [2,3]. (Source: Dental Materials)
Source: Dental Materials - July 23, 2018 Category: Materials Science Authors: Satoshi Yamaguchi, Renshirou Kani, Kazuma Kawakami, Manami Tsuji, Sayuri Inoue, Chunwoo Lee, Wakako Kiba, Satoshi Imazato Source Type: research
Characterisation of machinable structural polymers in restorative dentistry
The advent of CAD/CAM in restorative dentistry has increased the range of fabrication technologies beyond polymerisation, casting and porcelain-densification by sintering. Until recently, the focus of CAD/CAM has been on machinable ceramics [1], as polymers were considered to have inferior structural properties making them less desirable restorative materials with unpredictable long-term performance [2]. (Source: Dental Materials)
Source: Dental Materials - July 20, 2018 Category: Materials Science Authors: Abdulrahman Elmougy, Alvaro Mu ñoz Schiemann, Duncan Wood, Sarah Pollington, Nicolas Martin Source Type: research
Hydrofluoric acid concentrations: Effect on the cyclic load-to-failure of machined lithium disilicate restorations
With an increasing demand for aesthetics and mechanical reliability, lithium disilicate ceramic has been meeting an outstanding role among the glass-ceramics available for monolithic restorations. This ceramic material, feasible to machining by CAD/CAM (computer-aided design/computer-aided manufacturing) presents a good success rate ( ∼95%) for single crowns for up to 10 years of follow-up [1–3]. (Source: Dental Materials)
Source: Dental Materials - July 18, 2018 Category: Materials Science Authors: Catina Prochnow, Andressa Borin Venturini, Lu ís Felipe Guilardi, Gabriel Kalil Rocha Pereira, Thiago Augusto Lima Burgo, Marco Cícero Bottino, Cornelis Johannes Kleverlaan, Luiz Felipe Valandro Source Type: research
Demineralization capacity of commercial 10-methacryloyloxydecyl dihydrogen phosphate-based all-in-one adhesive
We determined the amounts of calcium salt of 10-methacryloyloxydecyl dihydrogen phosphate (MDP-Ca salt) and dicalcium phosphate dihydride (DCPD) with an amorphous phase developed during the application of commercial MDP-based all-in-one adhesives to enamel and dentin. This is because the demineralization by MDP and following calcium salt formation of MDP may be limited by an ionic bond formation of MDP to hydroxyapaptite in the enamel and dentin and following intermediary layer formation of MDP, since MDP forms a chemically-stable adsorption layer. (Source: Dental Materials)
Source: Dental Materials - July 17, 2018 Category: Materials Science Authors: Kou Fujita (Nakajima), Toru Nikaido, Akishi Arita, Satoshi Hirayama, Norihiro Nishiyama Source Type: research
Editorial Board
(Source: Dental Materials)
Source: Dental Materials - July 7, 2018 Category: Materials Science Source Type: research
In vitro evaluation of the early erosive lesion in polished and natural human enamel
Erosive tooth wear is a common oral condition which if not treated can compromise the longevity of teeth and a person ’s quality of life [1]. Understanding what happens in the early stages of this condition, particularly to the integrity of the enamel surface, should enable a better understanding of prevention [2]. The time acidic foods or drinks are exposed in the mouth during eating and or drinking is not preci sely known, due to individual variation, but it’s likely to be only for a few seconds. (Source: Dental Materials)
Source: Dental Materials - July 6, 2018 Category: Materials Science Authors: P. Mylonas, R.S. Austin, R. Moazzez, A. Joiner, D.W. Bartlett Source Type: research
Delayed post-curing stage and oxygen inhibition of free-radical polymerization of dimethacrylate resin
It is known that after light-initiated free radical polymerization of a dimethacrylate monomer system, the curing continues for some period of time after the curing light emission has stopped (so-called delayed post-curing stage, DPCS). It is also known that during free radical polymerization, the presence of oxygen effectively inhibits polymerization of monomers. However, less is known of the influence of oxygen inhibition of light initiated polymerization during the DPCS. The aim of this study was to determine some polymerization related properties of a resin system during the DPCS. (Source: Dental Materials)
Source: Dental Materials - July 2, 2018 Category: Materials Science Authors: Mikke K. Aromaa, Pekka K. Vallittu Source Type: research
Antimicrobial photodynamic active biomaterials for periodontal regeneration
Biomaterials for periodontal regeneration may have insufficient mechanical and antimicrobial properties or are difficult to apply under clinical conditions. The aim of the present study was to develop a polymeric bone grafting material of suitable physical appearance and antimicrobial photodynamic activity. (Source: Dental Materials)
Source: Dental Materials - July 2, 2018 Category: Materials Science Authors: B.W. Sigusch, S. Dietsch, A. Berg, A. Voelpel, A. Guellmar, U. Rabe, M. Schnabelrauch, D. Steen, B. Gitter, V. Albrecht, D.C. Watts, S. Kranz Source Type: research
Hydration dependent mechanical performance of denture adhesive hydrogels
Hydration in denture adhesives regulates the formation of complex morphologies and mechanical function. Multiscale experimental approaches are required to evaluate the impact of hydration on the inherent heterogeneity of denture adhesive-based hydrogels at different length scales and the impact of such phenomena on adhesion performance. (Source: Dental Materials)
Source: Dental Materials - June 27, 2018 Category: Materials Science Authors: Fengfeng Zhang, Yiran An, Nima Roohpour, Asa H. Barber, Julien E. Gautrot Source Type: research
Effect of high-intensity curing lights on the polymerization of bulk-fill composites
Dentistry has witnessed significant innovation of resin-based restorative materials in the last three decades. The success of this ongoing evolution appears to have been promulgated from new treatment strategies based on scientific evidences and practical constraints imposed by our clinical practices, patient demands, and empirical research. Especially for restorative dentistry, a paradigm shift toward light cured materials and away from amalgams is driven partially by the post-handling of mercury and its environmental concerns, partly by the gradual clinical success of RBCs, and by the increasing patient demand for esthet...
Source: Dental Materials - June 27, 2018 Category: Materials Science Authors: Mindy O. Daugherty, Wen Lien, Michael R. Mansell, Douglas L. Risk, Daniel A. Savett, Kraig S. Vandewalle Source Type: research
