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Dental Materials: Official Publication of the Academy of Dental Materials

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https://read.qxmd.com/read/30770133/three-dimensional-assessment-of-proximal-contact-enamel-using-optical-coherence-tomography
#1
Thwe Zin Ei, Yasushi Shimada, Ahmed Abdou, Alireza Sadr, Masahiro Yoshiyama, Yasunori Sumi, Junji Tagami
OBJECTIVE: The purpose of this study was to detect and investigate the association of enamel microcracks with demineralization at proximal contact areas of premolars, using 3D swept-source optical coherence tomography (SS-OCT). METHODS: Extracted maxillary and mandibular premolars (n=50 each), without any visible tooth cracks, were examined for demineralization of interproximal contact areas, using the International Caries Detection and Assessment System (ICDAS)...
February 12, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30745211/file-splitting-multilayer-vs-monolithic-y-tzp-fatigue-flexural-strength-and-loading-stresses-by-finite-element-analysis
#2
Ana Maria Estivalete Marchionatti, Vinícius Felipe Wandscher, Iana Lamadrid Aurélio, César Dalmolin Bergoli, Liliana Gressler May
OBJECTIVE: To compare file-splitting multilayer (fused and cemented) with monolithic Y-TZP on the fatigue flexural strength and finite element analysis (FEA) stresses. Additionally, to verify the effect of the material under tension in multilayer Y-TZP. METHODS: Disc-shaped (diameter: 14.4mm; thickness: 1.4mm) monolithic Y-TZP (IPS e.max ZirCAD - Ivoclar Vivadent) and trilayer specimens with Y-TZP framework (IPS e.max ZirCAD), intermediate layer of fusion ceramic (IPS e...
February 8, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30745210/influence-of-veneer-pore-defects-on-fracture-behavior-of-bilayered-lithium-disilicate-glass-ceramic-crowns
#3
Yutao Jian, Li Dao, Xiaodong Wang, Xinping Zhang, Michael V Swain, Ke Zhao
OBJECTIVE: To identify the conditions under which fabrication pore defects within veneering porcelain in bilayered lithium disilicate glass-ceramic (LDG) crowns will influence and jeopardize the mechanical integrity of the structure. METHODS: Thirty standardized molar crowns (IPS e.max Press) were fabricated and microCT scanned to 3D-analyze the size, morphology and distribution of pores in veneering porcelain, followed by in vitro fracture test and SEM fractographic observation...
February 8, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30738621/thermal-induced-deflection-of-a-porcelain-zirconia-bilayer-influence-of-cooling-rate
#4
M V Swain, V Mercurio, J E Tibballs, M Tholey
OBJECTIVE: To determine the thermal expansion of a porcelain (VM9) and tetragonal zirconia (Y-TZP) as well as the deflection upon re-heating and cooling of a bilayer fabricated from these two materials after slow and rapid cooling during initial fabrication. METHODS: The coefficient of thermal expansion (CTE) of bulk porcelain and Y-TZP as well as bilayer beam deflection was measured with a novel non-contact optical dilatometer. The influence of cooling rate during initial fabrication of the porcelain-zirconia bilayer and the bulk porcelain during subsequent heating and cooling is investigated...
February 6, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30712823/design-and-characterization-of-a-chitosan-enriched-fibrin-hydrogel-for-human-dental-pulp-regeneration
#5
Maxime Ducret, Alexandra Montembault, Jérôme Josse, Marielle Pasdeloup, Alexis Celle, Rafiqa Benchrih, Frédéric Mallein-Gerin, Brigitte Alliot-Licht, Laurent David, Jean-Christophe Farges
OBJECTIVE: Regenerating a functional dental pulp in the pulpectomized root canal has been recently proposed as a novel therapeutic strategy in dentistry. To reach this goal, designing an appropriate scaffold able to prevent the growth of residual endodontic bacteria, while supporting dental pulp tissue neoformation, is needed. Our aim was to create an innovative cellularized fibrin hydrogel supplemented with chitosan to confer this hydrogel antibacterial property. METHODS: Several fibrin-chitosan formulations were first screened by rheological analyses, and the most appropriate for clinical use was then studied in terms of microstructure (by scanning electron microscopy), antimicrobial effect (analysis of Enterococcus fæcalis growth), dental pulp-mesenchymal stem/stromal cell (DP-MSC) viability and spreading after 7 days of culture (LiveDead® test), DP-MSC ultrastructure and extracellular matrix deposition (transmission electron microscopy), and DP-MSC proliferation and collagen production (RT-qPCR and immunohistochemistry)...
January 31, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30711272/effects-of-the-reinforced-cellulose-nanocrystals-on-glass-ionomer-cements
#6
Rafael Menezes-Silva, Bruna Medeiros Bertol de Oliveira, Paulo Henrique Martins Fernandes, Lívia Yukari Shimohara, Fabiano Vargas Pereira, Ana Flávia Sanches Borges, Marília Afonso Rabelo Buzalaf, Renata Corrêa Pascotto, Sharanbir K Sidhu, Maria Fidela de Lima Navarro
OBJECTIVE: Glass-ionomer cements (GICs) modified with cellulose nanocrystals (CNs) were characterized and evaluated for compressive strength (CS), diametral tensile strength (DTS) and fluoride release (F- ). METHODS: Commercially available GICs (Maxxion, Vidrion R, Vitro Molar, Ketac Molar Easy Mix and Fuji Gold Label 9) were reinforced with CNs (0.2% by weight). The microstructure of CNs and of CN-modified GICs were evaluated by transmission electron microscopy (TEM) and by scanning electron microscopy (SEM) while chemical characterization was by Fourier transform infrared spectroscopy (FTIR)...
January 30, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30711271/effect-of-pulse-width-modulated-led-light-on-the-temperature-change-of-composite-in-tooth-cavities
#7
Seol-Ah Jo, Chang-Ha Lee, Min-Jung Kim, Jack Ferracane, In-Bog Lee
OBJECTIVE: The purpose of this study was to investigate the effects of the radiant emittance and cure time of pulse width modulation (PWM)-controlled LED light on the temperature change of composite and dentin. METHODS: Class I cavities (M-D 6mm, B-L 4mm, Depth 2.5mm) were prepared on 30 extracted human molars and vertically sectioned to expose the mesial side of the cavity and tooth. Cavities were filled with Bulk Fill Posterior Restorative (BFP, 3M ESPE) and cured with an LED light...
January 30, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30711270/effectiveness-of-pre-silanization-in-improving-bond-performance-of-universal-adhesives-or-self-adhesive-resin-cements-to-silica-based-ceramics-chemical-and-in-vitro-evidences
#8
Bingzhuo Chen, Zhicen Lu, Hongliang Meng, Ying Chen, Lu Yang, Huaiqin Zhang, Haifeng Xie, Chen Chen
OBJECTIVES: To examine effectiveness of pre-silanization in improving bond performance of multipurpose products such as universal adhesives or self-adhesive resin cements to silica-based ceramics. METHODS: The present study investigated reactions between silanol groups of γ-methacryloxypropyltrimethoxysilane (γ-MPS) and silica, dehydration self-condensation of γ-MPS, and condensation polymerization between γ-MPS and 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) by using thermodynamic calculations...
January 30, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30709613/influence-of-external-energy-sources-on-the-dynamic-setting-process-of-glass-ionomer-cements
#9
Bruna M B de Oliveira, Izabelle E Agostini, Mauro L Baesso, Rafael Menezes-Silva, Ana Flávia S Borges, Maria Fidela L Navarro, John W Nicholson, Sharanbir K Sidhu, Renata C Pascotto
OBJECTIVE: To evaluate the influence of external energy sources on the dynamic setting process of glass-ionomer restorative materials. METHODS: Eighteen brands of GIC were studied: Bioglass R (Biodinâmica; G1), Chemfil Rock (Dentsply; G2), Equia Forte (GC; G3), Gold Label 2 (GC; G4), Gold Label 9 (GC; G5), Glass Ionomer Cement Type II - (Shofu; G6), Ionglass R (Maquira; G7), Ion Z (FGM; G8), Ionomaster (Wilcos; G9), Ionofil Plus (Voco; G10), Ionostar Plus (Voco; G11), Ketac Molar easymix (3M ESPE; G12), Magic Glass R (Vigodent; G13), Maxxion R (FGM; G14), Riva Self Cure (SDI; G15), Vidrion R (SS White; G16), Vitro Fil R (Nova DFL; G17) and Vitro Molar (Nova DFL; G18)...
January 29, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30704750/long-term-elution-of-monomers-from-resin-based-dental-composites
#10
Eveline Putzeys, Siemon De Nys, Stevan M Cokic, Radu Corneliu Duca, Jeroen Vanoirbeek, Lode Godderis, Bart Van Meerbeek, Kirsten L Van Landuyt
OBJECTIVE: To bridge the gap between the current alarming literature on resin-based dental materials and the limited clinical observations, more precise knowledge on the actual quantity of released compounds should be acquired. The objective of this study was to quantify the long-term elution of various compounds from resin-based dental composites during one year. METHODS: Eight materials were investigated: G-aenial Anterior, G-aenial Posterior, Venus, Venus Pearl, Venus Diamond, Ceram X mono, Dyract and Filtek Supreme XTE...
January 28, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30686711/fatigue-performance-of-adhesively-cemented-glass-hybrid-and-resin-ceramic-materials-for-cad-cam-monolithic-restorations
#11
Andressa B Venturini, Catina Prochnow, Gabriel K R Pereira, Rodrigo D Segala, Cornelis J Kleverlaan, Luiz Felipe Valandro
OBJECTIVE: To evaluate the fatigue failure load, number of cycles until failure, and survival probability of adhesively cemented materials with different microstructures (glass-, hybrid- and resin-ceramic) used to manufacture CAD/CAM monolithic restorations. METHODS: Disc-shaped specimens (n=15; Ø=10mm; thickness=1.0mm) were produced from CAD/CAM blocks as follows: feldspathic (FEL); leucite (LEU); lithium disilicate (LD); zirconia-reinforced lithium silicate (ZRLS); polymer-infiltrated ceramic network (PICN); and resin nanoceramic (RNC)...
January 24, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30686710/production-tolerance-of-conventional-and-digital-workflow-in-the-manufacturing-of-glass-ceramic-crowns
#12
Deyar Jallal Hadi Mahmood, Michael Braian, Christel Larsson, Ann Wennerberg
OBJECTIVES: To measure and compare the size of the cement gap of wax and polymer copings and final glass-ceramic crowns, produced from conventional and digital workflows, one additive and one subtractive. METHODS: Thirty wax copings were made by conventional manual layering technique and modeling wax on stone models with spacer varnish simulating a cement spacer. The wax copings were embedded and press-cast in lithium disilicate glass ceramic. Thirty wax copings were produced by milling from a wax blank, i...
January 24, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30686709/validation-of-in-vitro-tests-of-zirconia-ceramic-inlay-retained-fixed-partial-dentures-a-finite-element-analysis
#13
M Waldecker, S Rues, P Rammelsberg, W Bömicke
OBJECTIVE: In the past, discrepancies between laboratory results and clinical behavior have been observed for all-ceramic restorations. This analysis of fracture resistance of zirconia-based inlay-retained fixed partial dentures (IRFPDs) aimed at identifying correlations between an in-vitro test setup and the clinical situation. The effects of tooth material, tooth mobility, restoration design, load direction, and different cements were taken into account. METHODS: The in-vitro test model and IRFPD were reverse engineered (Geomagic DesignX) and meshed predominantly with hexahedral elements (approx...
January 24, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30686708/lifetime-prediction-of-veneered-versus-monolithic-lithium-disilicate-crowns-loaded-on-marginal-ridges
#14
Vitor Guarçoni de Paula, Gerson Bonfante, Fabio C Lorenzoni, Paulo G Coelho, Leonardo Rigoldi Bonjardim, Vinicius P Fardin, Estevam A Bonfante
OBJECTIVE: To evaluate the probability of survival of monolithic and porcelain veneered lithium disilicate crowns comprised by a conventional or modified core when loaded on marginal ridges. METHODS: Lithium disilicate molar crowns (n=30) were fabricated to be tested at mesial and distal marginal ridges and were divided as follows: (1) bilayered crowns with even-thickness 0.5mm framework (Bi-EV); (2) bilayered crowns with modified core design (Bi-M-lingual collar connected to proximal struts), and: (3) monolithic crowns (MON)...
January 24, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30686707/hema-modulates-the-transcription-of-genes-related-to-oxidative-defense-inflammatory-response-and-organization-of-the-ecm-in-human-oral-cells
#15
Renke Perduns, Joachim Volk, Peter Schertl, Gabriele Leyhausen, Werner Geurtsen
OBJECTIVES: 2-Hydroxyethyl methacrylate (HEMA) is a widely used monomer of dental resin composite materials. Incomplete curing of resins leads to elution of HEMA, which may come in contact with different cells in oral tissues. We aimed to analyze the impact of HEMA on the transcription of genes participating in detoxification of oxidative stress, inflammatory response and organization of the extracellular matrix (ECM) using human gingival fibroblasts (HGFs) and human oral keratinocytes (OKF6/TERT2)...
January 24, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30685109/assessment-of-metal-sleeve-free-3d-printed-implant-surgical-guides
#16
Kyung Chul Oh, Ji-Man Park, June-Sung Shim, Jee-Hwan Kim, Jong-Eun Kim, Jang-Hyun Kim
OBJECTIVES: The aim of the present study was to investigate the adaptation and guide hole tolerance of metal sleeve-free computer-assisted implant surgical guides fabricated with 3D printers. METHODS: An implant surgical guide for full-guided implant placement was designed with a total of eight different guide holes. Ten implant surgical guides (n=10) were fabricated from the same design with each of five in-office 3D printers (D1, FOR, ONE, PER, and ZEN) using compatible printing materials...
January 23, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30683418/investigation-into-the-accuracy-and-measurement-methods-of-sequential-3d-dental-scan-alignment
#17
Saoirse O'Toole, Cecilie Osnes, David Bartlett, Andrew Keeling
OBJECTIVES: Alignment procedures have yet to be standardised and may influence the measurement outcome. This investigation assessed the accuracy of commonly used alignment techniques and their impact on measurement metrics. METHODS: Datasets of 10 natural molar teeth were created with a structured-light model-scanner (Rexcan DS2, Europac 3D, Crewe). A 300μm depth layer was then digitally removed from the occlusal surface creating a defect of known size. The datasets were duplicated, randomly repositioned and re-alignment attempted using a "best-fit" alignment, landmark-based alignment or reference alignment in Geomagic Control (3D Systems, Darmstadt, Germany)...
January 22, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30679016/inhibition-of-secondary-caries-in-vitro-by-addition-of-chlorhexidine-to-adhesive-components
#18
Christina Boutsiouki, Roland Frankenberger, Susanne Lücker, Norbert Krämer
OBJECTIVE: To investigate secondary caries inhibition after dentine pre-treatment with 2% CHX, experimental addition of CHX in primer and adhesive of a 3-step adhesive system, and industrial addition od CHX in a 2-step adhesive system. MATERIALS AND METHOD: Sixty Class-V cavities were restored according to the adhesive protocol (n=12): 1) control group, Scotchbond Multi-Purpose, 3M (CTRL), 2) 2% CHX dentine pre-treatment (DENT), 3) 0.1% CHX in primer (PRIM), 4) 0...
January 21, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30642637/effect-of-eluates-from-zirconia-modified-glass-ionomer-cements-on-dna-double-stranded-breaks-in-human-gingival-fibroblast-cells
#19
Arunee Laiteerapong, Franz-Xaver Reichl, Reinhard Hickel, Christof Högg
OBJECTIVE: To formulate novel glass ionomer cements (GICs) containing zirconia (nanoparticles (NPs) and micro-particles (MPs)) and investigate the genotoxic effect of their eluates on DNA double-strand breaks of human gingival fibroblasts (HGFs) in vitro using a γ-H2AX fluorescent assay. METHODS: GIC (control, C), 10%ZrO2 NPsGIC (T1) and 10%ZrO2 MPsGIC (T2) were prepared per the manufacturer's instructions (hand-mixed, P/L=3.4:1w/w%). Dulbecco's modified Eagle's medium (DMEM) was used as the culture medium for HGFs and for eluate preparation...
January 11, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
https://read.qxmd.com/read/30642636/antimicrobial-and-anti-inflammatory-drug-delivery-systems-at-endodontic-reparative-material-synthesis-and-characterization
#20
Marla Cuppini, Kelly Cristine Zatta, Letícia Boldrin Mestieri, Fabiana Soares Grecca, Vicente Castelo Branco Leitune, Sílvia Stanisçuaski Guterres, Fabrício Mezzomo Collares
OBJECTIVE: The aim of this study was to synthesize and characterize an experimental endodontic paste. METHODS: An experimental endodontic paste (EX) was characterized by its particle size, zeta potential, drug content and morphology. The powder of EX is composed of amoxicillin microspheres, calcium tungstate and α-tricalcium phosphate, mixed with an indomethacin nanocapsules suspension. Ultracal® (Ultradent), an iodoform-based paste (GP) and the EX were evaluated by its physical properties (flow, film thickness and radiopacity)...
January 11, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
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