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Dental Materials: Official Publication of the Academy of Dental Materials

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https://www.readbyqxmd.com/read/30424918/assessing-the-osteogenic-potential-of-zirconia-and-titanium-surfaces-with-an-advanced-in-vitro-model
#1
Markus Rottmar, Eike Müller, Stefanie Guimond-Lischer, Marc Stephan, Simon Berner, Katharina Maniura-Weber
OBJECTIVES: In recent years, zirconia dental implants have gained increased attention especially for patients with thin gingival biotypes or patients seeking metal-free restoration. While physical and chemical material surface properties govern the blood-material interaction and subsequent osseointegration processes, the organizational principles underlying the interplay of biochemical and biophysical cues are still not well understood. Therefore, this study investigated how the interaction of a microstructured zirconia surface with blood influences its osseointegration potential compared to microstructured titanium with or without additional nanostructures...
November 10, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30424917/calcium-phosphate-coatings-elaborated-by-the-soaking-process-on-titanium-dental-implants-surface-preparation-processing-and-physical-chemical-characterization
#2
Camille Pierre, Ghislaine Bertrand, Christian Rey, Olivier Benhamou, Christèle Combes
OBJECTIVE: Dental implant manufacturers are looking for new surfaces to improve osseointegration. It is accepted that calcium phosphate coatings favor bone healing. Among all the techniques, the soaking process seems attractive because of its ability in producing a bioactive coating at low temperature. The objective of this study is to improve the titanium implant surface roughness and chemistry by optimizing the surface preparation and the soaking process parameters to produce a bioactive and adherent calcium phosphate coating...
November 10, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30384976/effect-of-cryopreservation-of-teeth-on-the-structural-integrity-of-dentin
#3
W Yan, M Tenwalde, M Øilo, H Zhang, D Arola
The autotransplantation of teeth after cryopreservation has become an increasingly viable method for whole tooth replacement. While the immediate success rates are quite high, damage introduced by cryopreservation within the dentin or enamel could be detrimental to the durability of these teeth. OBJECTIVE: to determine whether cryopreservation alters the microstructure of dentin or causes a reduction of its resistance to mechanical failures. METHODS: Third molars were obtained from young donors (18≤age≤30yrs) and subjected to a cryopreservation protocol involving storage for 10days in cryoprotectant solution at -196°C...
October 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30360901/five-hundred-patients-reporting-on-adverse-effects-from-dental-materials-frequencies-complaints-symptoms-allergies
#4
Pauline Mittermüller, Karl-Anton Hiller, Gottfried Schmalz, Wolfgang Buchalla
OBJECTIVE: Information on patients with real or claimed adverse reactions towards dental materials in large patient cohorts is rare. Therefore, the aim of the present study was to investigate patients reporting on complaints and symptoms to dental materials over a 16-year period. METHODS: Five hundred patients were characterized by one single dental team regarding age and sex distribution, subjective complaints and objective intraoral symptoms, and allergy status relevant to dental materials...
October 22, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30342771/quaternary-ammonium-silane-based-antibacterial-and-anti-proteolytic-cavity-cleanser
#5
Ya-Ping Gou, Ji-Yao Li, Mohamed M Meghil, Christopher W Cutler, Hockin H K Xu, Franklin R Tay, Li-Na Niu
OBJECTIVE: Secondary caries and degradation of hybrid layers are two major challenges in achieving durable resin-dentin bonds. The objectives of the present study were to investigate the effects of a 2% quaternary ammonium silane (QAS) cavity cleanser on bacteria impregnated into dentin blocks and the gelatinolytic activity of the hybrid layers. METHODS: Microtensile bond strength was first performed to evaluate if the 2% QAS cavity cleanser adversely affected bond strength...
October 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30340767/cytotoxic-and-genotoxic-potential-of-the-type-i-photoinitiators-bapo-and-tpo-on-human-oral-keratinocytes-and-v79-fibroblasts
#6
Marina Popal, Joachim Volk, Gabriele Leyhausen, Werner Geurtsen
OBJECTIVES: Phenylbis(acyl) phosphine oxide (BAPO) and diphenyl(acyl) phosphine oxide (TPO) are alternative photoinitiators to camphorquinone (CQ) in dental resinous materials. Aim of this study was to investigate their cytotoxic/genotoxic potential in human oral keratinocytes (OKF6/Tert2) and Chinese hamster lung fibroblasts (V79) in comparison to CQ. METHODS: Cells were exposed to different concentrations of BAPO and TPO (1-50μM). Cytotoxicity was evaluated using H33342 and MTT assay, cell proliferation by BrdU proliferation assay and microscopy...
October 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30336953/in-situ-photochemical-crosslinking-of-hydrogel-membrane-for-guided-tissue-regeneration
#7
Pauline Marie Chichiricco, Raphael Riva, Jean-Michel Thomassin, Julie Lesoeur, Xavier Struillou, Catherine Le Visage, Christine Jérôme, Pierre Weiss
OBJECTIVE: Periodontitis is an inflammatory disease that destroys the tooth-supporting attachment apparatus. Guided tissue regeneration (GTR) is a technique based on a barrier membrane designed to prevent wound space colonization by gingival cells. This study examined a new formulation composed of two polymers that could be photochemically cross-linked in situ into an interpenetrated polymer network (IPN) forming a hydrogel membrane. METHODS: We synthetized and characterized silanized hydroxypropyl methylcellulose (Si-HPMC) for its cell barrier properties and methacrylated carboxymethyl chitosan (MA-CMCS) for its degradable backbone to use in IPN...
October 15, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30318115/the-effects-of-cross-linking-agent-and-surfactant-on-the-tear-strength-of-novel-vinyl-polysiloxane-impression-materials
#8
Shahab Ud Din, Sandra Parker, Michael Braden, Mangala Patel
OBJECTIVES: To formulate experimental hydrophobic and hydrophilic vinyl polysiloxane (VPS) impression materials ab initio, comprising a novel cross-linking agent, tetra-functional (dimethylsilyl) orthosilicate (TFDMSOS), and a non-ionic surfactant, Rhodasurf CET-2 (ethoxylatedcetyl-oleyl alcohol), and to investigate their effects on tear strength (TS). METHODS: Five experimental formulations (Exp I-V) were prepared and compared with three medium bodied commercial VPS impression materials (Aq M, Elt M, Extr M)...
October 11, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30316525/biological-interactions-of-a-calcium-silicate-based-cement-biodentine%C3%A2-with-stem-cells-from-human-exfoliated-deciduous-teeth
#9
Eirini Athanasiadou, Maria Paschalidou, Anna Theocharidou, Nikolaos Kontoudakis, Konstantinos Arapostathis, Athina Bakopoulou
OBJECTIVE: To investigate the biological interactions of a calcium silicate based cement (Biodentine™) with Stem Cells from Human Exfoliated Deciduous teeth (SHED), focusing on viability/proliferation, odontogenic differentiation, biomineralization and elemental release/exchange. METHODS: Biodentine™ specimens were used directly or for eluate preparation at serial dilutions (1:1-1:64). SHED cultures were established from deciduous teeth of healthy children. Viability/proliferation and morphological characteristics were evaluated by live/dead fluorescent staining, MTT assay and Scanning Electron Microscopy...
October 10, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30314867/analysis-of-pre-test-failures-and-bond-strengths-of-seven-adhesive-systems-to-bovine-dentine-a-nine-year-novice-beginner-operator-study
#10
A Franz, S Lettner, D C Watts, A Graf, A Moritz, A Schedle
OBJECTIVE: The aims were to evaluate, via multi-year student cohorts: (i) the incidence of pre-test failures and (ii) shear bond strengths of single- and multi-step adhesives to bovine dentin. METHODS: The experiments were performed by cohorts of dental students (2008-2016). Each year the bond strengths of three dental adhesives to bovine dentin were tested. Four self-etching adhesives (Optibond-All-in-One, [OBAIO]; Optibond XTR [OBXTR]); Xeno V [XV]; Xeno V+ [XV+]; a three-step etch-and-rinse-system (Optibond FL, [OBFL]), a self-etch universal adhesive (Scotchbond Universal [SBU]) and a self-etch/etch-and-rinse adhesive (Xeno Select, [XS]) were included in the study...
October 9, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30301624/biostable-antidegradative-and-antimicrobial-restorative-systems-based-on-host-biomaterials-and-microbial-interactions
#11
REVIEW
Cameron A Stewart, Yoav Finer
OBJECTIVES: Despite decades of development and their status as the restorative material of choice for dentists, resin composite restoratives and adhesives exhibit a number of shortcomings that limit their long-term survival in the oral cavity. Herein we review past and current work to understand these challenges and approaches to improve dental materials and extend restoration service life. METHODS: Peer-reviewed work from a number of researchers as well as our own are summarized and analyzed...
October 6, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30301623/towards-quantitative-analysis-of-enamel-erosion-by-focused-ion-beam-tomography
#12
Nancie Cougot, Thierry Douillard, Florent Dalmas, Nelly Pradelle, Rémy Gauthier, Clarisse Sanon, Brigitte Grosgogeat, Pierre Colon, Jérome Chevalier
OBJECTIVES: The purpose of this work is a proof of concept to introduce a new quantitative 3D-analysis of dental erosion obtained by focused ion beam (FIB) tomography associated with silver nitrate penetration into porosities in etched enamel. METHODS: One sample selected was sound enamel after removal of the aprismatic surface. The other was studied after applying an additional attack with orthophosphoric acid. Both surfaces were infiltrated with silver nitrate via immersion...
October 6, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30293689/do-collagen-cross-linkers-improve-dentin-s-bonding-receptiveness
#13
C Parise Gré, D Pedrollo Lise, A P Ayres, J De Munck, A Tezvergil-Mutluay, R Seseogullari-Dirihan, G C Lopes, K Van Landuyt, Bart Van Meerbeek
OBJECTIVES: Dentin biomodification using collagen cross-linkers has been proposed as one of the strategies to improve bond durability of adhesives to dentin. However, literature is not very consistent regarding their benefit, in particular when cross-linkers are applied in clinically realistic application times. This study investigated the effect of three cross-linkers on the mini-interfacial fracture toughness (mini-iFT) of four adhesives bonded to dentin following either etch&rinse (E&R) or self-etch (SE) modes...
October 4, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30293688/objects-build-orientation-positioning-and-curing-influence-dimensional-accuracy-and-flexural-properties-of-stereolithographically-printed-resin
#14
Alexey Unkovskiy, Phan Hai-Binh Bui, Christine Schille, Juergen Geis-Gerstorfer, Fabian Huettig, Sebastian Spintzyk
OBJECTIVE: To evaluate the influence of printing parameters on flexural properties and accuracy of SLA-printed standard objects. METHODS: Thirty specimens were printed in 0°, 45° and 90° orientation. Fourth nine more specimens were printed evenly on the build platform. forty more specimens were printed and polymerized with three curing unit. Length, height and width was measured three times for each specimen and compared to the original dimensions. Afterwards all specimens underwent a three-point-bending test to assess their flexural properties...
October 4, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30269864/protein-repellent-nanocomposite-with-rechargeable-calcium-and-phosphate-for-long-term-ion-release
#15
Yousif A Al-Dulaijan, Michael D Weir, Mary Anne S Melo, Jirun Sun, Thomas W Oates, Ke Zhang, Hockin H K Xu
OBJECTIVE: There has been no report on the effect of incorporating protein repellent 2-methacryloyloxyethyl phosphorylcholine (MPC) into a composite containing nanoparticles of amorphous calcium phosphate (NACP) on calcium (Ca) and phosphate (P) ion rechargeability. The objectives of this study were to develop a Ca and P ion-rechargeable and protein-repellent composite for the first time, and investigate the effects of MPC and NACP on mechanical properties, protein-repellency, anti-biofilm effects, and Ca and P ion recharge and re-release...
September 27, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30269863/restoration-integrity-but-not-material-or-cementation-strategy-determined-secondary-caries-lesions-next-to-indirect-restorations-in-vitro
#16
Michel Lehmensiek, Haitham Askar, Fredrik Brouwer, Uwe Blunck, Sebastian Paris, Falk Schwendicke
OBJECTIVE: Secondary caries lesions next to direct restorations are associated with the restoration material and the integrity of the tooth-restoration-interface (presence of interfacial gaps) as well as the application of masticatory forces. It remains unclear if this is true for indirect restorations. We aimed to evaluate secondary lesions next to conventionally-cemented partial gold (PG) and adhesively-cemented partial ceramic (PC) restorations, placed with or without interfacial gaps...
September 27, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30269862/pulp-capping-materials-modulate-the-balance-between-inflammation-and-regeneration
#17
REVIEW
Thomas Giraud, Charlotte Jeanneau, Charlotte Rombouts, Hengameh Bakhtiar, Patrick Laurent, Imad About
The interrelations between inflammation and regeneration are of particular significance within the dental pulp tissue inextensible environment. Recent data have demonstrated the pulp capacity to respond to insults by initiating an inflammatory reaction and dentin pulp regeneration. Different study models have been developed in vitro and in vivo to investigate the initial steps of pulp inflammation and regeneration. These include endothelial cell interaction with inflammatory cells, stem cell interaction with pulp fibroblasts, migration chambers to study cell recruitment and entire human tooth culture model...
September 27, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30268678/mechanical-and-cytotoxicity-properties-of-hybrid-ceramics-filled-polyamide-12-filament-feedstock-for-craniofacial-bone-reconstruction-via-fused-deposition-modelling
#18
Abdul Manaf Abdullah, Tuan Noraihan Azila Tuan Rahim, Wan Nur Fadilla Wan Hamad, Dasmawati Mohamad, Hazizan Md Akil, Zainul Ahmad Rajion
OBJECTIVE: To compare the mechanical and biological properties of newly developed hybrid ceramics filled and unfilled polyamide 12 (PA 12) for craniofacial reconstruction via a fused deposition modelling (FDM) framework. METHODS: 15wt% of zirconia (ZrO2 ) as well as 30, 35, and 40wt% of beta-tricalcium phosphate (β-TCP) were compounded with PA 12, followed by the fabrication of filament feedstocks using a single screw extruder. The fabricated filament feedstocks were used to print the impact specimens...
September 26, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30268677/accuracy-of-single-crowns-fabricated-from-ultrasound-digital-impressions
#19
Luciano Praça, Fabrice Chuembou Pekam, Rodrigo Otavio Rego, Klaus Radermacher, Stefan Wolfart, Juliana Marotti
OBJECTIVE: This in vitro study aimed to evaluate marginal and internal fit of single crowns produced from high-frequency ultrasound based digital impressions of teeth prepared with finish lines covered by porcine gingiva, in comparison with those obtained by optical scanners with uncovered finish lines. METHODS: Ten human teeth were prepared and forty zirconia crowns were fabricated from STL-datasets obtained from four dental scanners (n=10): extraoral CS2 (Straumann), intraoral Lava COS (3M), intraoral Trios (3Shape) and extraoral ultrasound scanner...
September 26, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30262134/using-fractal-geometry-to-examine-failed-implants-and-prostheses
#20
Jason A Griggs
OBJECTIVE: To develop a novel protocol that is precise and accurate for analyzing the fracture surfaces of ceramic specimens using fractal geometry and to demonstrate its use on both clinically retrieved specimens and standard test specimens. METHODS: A MathCAD script was written to transfer data from atomic force microscope scans to the FRACTALS software of John Russ. This software provided six algorithms for analyzing surfaces, so an experiment was conducted to determine which algorithm provided the most precision in fractal dimensional increment (D*) values and to calibrate that algorithm on surfaces generated with known D* values...
September 24, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
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