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https://www.readbyqxmd.com/read/29678329/antibacterial-photocatalytic-activity-of-different-crystalline-tio-2-phases-in-oral-multispecies-biofilm
#1
Heloisa N Pantaroto, Antonio P Ricomini-Filho, Martinna M Bertolini, José H D Silva, Nilton F Azevedo Neto, Cortino Sukotjo, Elidiane C Rangel, Valentim A R Barão
OBJECTIVE: Titanium dioxide (TiO2 ) incorporation in biomaterials is a promising technology due to its photocatalytic and antibacterial activities. However, the antibacterial potential of different TiO2 crystalline structures on a multispecies oral biofilm remains unknown. We hypothesized that the different crystalline TiO2 phases present different photocatalytic and antibacterial activities. METHODS: Three crystalline TiO2 films were deposited by magnetron sputtering on commercially pure titanium (cpTi), in order to obtain four groups: (1) machined cpTi (control); (2) A-TiO2 (anatase); (3) M-TiO2 (mixture of anatase and rutile); (4) R-TiO2 (rutile)...
April 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29676971/conservative-treatment-of-a-complicated-crown-root-fracture-using-adhesive-fragment-reattachment-and-composite-resin-restoration-two-year-follow-up
#2
A V Martins, R C Albuquerque, L D Lanza, Ê L Vilaça, Nrfa Silva, A N Moreira, R R da Silveira
Crown-root fracture is one of the most challenging fracture types in the dental traumatology literature. Traumatized anterior teeth require quick functional and esthetic repair. In the case of a complex crown fracture of the maxillary left central incisor, requiring endodontic treatment, a fiber-reinforced post was used to create a central support stump to restore the dental morphology. This report describes the clinical procedures involved in the treatment. After two years of follow-up, the clinical and radiographic findings demonstrated that the adopted clinical protocol was successful and yielded healthy periodontal tissues with no signs of periradicular pathology...
May 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29675998/biomaterial-granules-used-for-filling-bone-defects-constitute-3d-scaffolds-porosity-microarchitecture-and-molecular-composition-analyzed-by-microct-and-raman-microspectroscopy
#3
Baptiste Arbez, Jean-Daniel Kün-Darbois, Thierry Convert, Bernard Guillaume, Philippe Mercier, Laurent Hubert, Daniel Chappard
Biomaterials are used in the granular form to fill small bone defects. Granules can be prepared with a grinder from trabecular bone samples or provided as synthetic biomaterials by industry. Granules occupy the 3D-space and create a macroporosity allowing invasion of vascular and bone cells when the inter-granular pores are larger than 300 µm. We compared the 3D-porosity of granule stacks obtained or prepared with nine biomaterials Osteopure® , Lubboc® , Bio-Oss® , CopiOs® , TCP Dental® , TCP Dental HP® , KeraOs® , and TCH® in comparison with that of human trabecular bone...
April 19, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29674703/difference-in-virulence-and-composition-of-a-cariogenic-biofilm-according-to-substratum-direction
#4
Minh-Huy Dang, Ji-Eun Jung, Hyeon-Mi Choi, Jae-Gyu Jeon
The aim of this study was to investigate the difference in composition and virulence of Streptococcus mutans biofilms according to substratum direction. S. mutans biofilms (46-h-old) were formed on three different saliva-coated hydroxyapatite (sHA) disc direction groups: downward (discs placed in the direction of gravity), vertical (discs placed parallel to gravity direction), and upward (discs placed opposite to gravity). The 46-h-old biofilms on sHA discs in the upward direction showed the highest biofilm accumulation, colony forming unit (CFU) count, and extracellular polysaccharide (EPS) amount, followed by those in the vertical and downward directions...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29673709/evaluation-of-the-filler-packing-structures-in-dental-resin-composites-from-theory-to-practice
#5
Ruili Wang, Eric Habib, X X Zhu
OBJECTIVES: The aim of this study is to evaluate the packing properties of uniform silica particles and their mixture with secondary particles yielding maximally loaded dental composites. We intend to verify the difference between the idealized models (the close-packed structures and the random-packed structures) and the actual experimental results, in order to provide guidance for the preparation of dental composites. The influence of secondary particle size and the resin composition on the physical-mechanical properties and the rheological properties of the experimental dental composites was also investigated...
April 16, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29670735/microleakage-of-porcelain-laminate-veneers-cemented-with-different-bonding-techniques
#6
Satheesh B Haralur
Background: Porcelain laminate veneers (PLV) are continued to be popular in modern dental practice due to its high aesthetic outcome and conservative tooth preparation. The composite resins are commonly used as luting agents for cementation of PLV. Polymerisation shrinkage induced marginal gap and interfacial leakage is the persistent limitation with the resin luting cements. The objective of the study was to assess the effect of various dentin bonding techniques on the microleakage after accelerated ageing in porcelain laminate veneres...
February 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29669953/three-dimensional-diagnosis-of-dentin-caries-beneath-composite-restorations-using-swept-source-optical-coherence-tomography
#7
Chihiro Matsuura, Yasushi Shimada, Alireza Sadr, Yasunori Sumi, Junji Tagami
The aims of this study were to assess the diagnostic accuracy of swept-source optical coherence tomography (SS-OCT) for detection of caries beneath composite restorations and to compare the results with those obtained by radiography. Flat dentin surfaces with and without natural caries were bonded with 1- or 2-mm thick composite restorations. SS-OCT scanning was performed over the composite restorations to construct three-dimensional (3D) images of the resin-dentin interface. Images were chosen from the 3D constructions to detect caries beneath the restorations...
April 17, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/29666288/microbiota-and-metatranscriptome-changes-accompanying-the-onset-of-gingivitis
#8
Emily M Nowicki, Raghav Shroff, Jacqueline A Singleton, Diane E Renaud, Debra Wallace, Julie Drury, Jolene Zirnheld, Brock Colleti, Andrew D Ellington, Richard J Lamont, David A Scott, Marvin Whiteley
Over half of adults experience gingivitis, a mild yet treatable form of periodontal disease caused by the overgrowth of oral microbes. Left untreated, gingivitis can progress to a more severe and irreversible disease, most commonly chronic periodontitis. While periodontal diseases are associated with a shift in the oral microbiota composition, it remains unclear how this shift impacts microbiota function early in disease progression. Here, we analyzed the transition from health to gingivitis through both 16S v4-v5 rRNA amplicon and metatranscriptome sequencing of subgingival plaque samples from individuals undergoing an experimental gingivitis treatment...
April 17, 2018: MBio
https://www.readbyqxmd.com/read/29663972/a-multidisciplinary-approach-to-restore-an-unconventional-crown-removal-of-traumatized-permanent-central-incisors
#9
Richard E Campbell, Heather T Morris, Kyle T Reynolds, Elizabeth S Gosnell
A 13-year-old female presented with traumatized maxillary central incisors that had been endodontically treated. Five years later, at a different dental office, she had the clinical crowns removed, leaving subgingival margins. From the patient's history and our initial assessment, it seemed as if the teeth had been fractured and luxated but not avulsed. Endodontic posts with spot-welded orthodontic brackets were temporarily cemented to enable orthodontic extrusion. Once access to restorable margins was obtained, the temporary posts were removed and conventional fiber posts with interim composite crowns were placed...
January 15, 2018: Journal of Dentistry for Children
https://www.readbyqxmd.com/read/29663970/pediatric-dentists-treatment-planning-decisions-for-class-ii-carious-lesions-in-primary-molars
#10
Martha Holland, Caroline Carrico, Tiffany Williams
PURPOSE: To assess pediatric dentists' choice for restoring Class II carious lesions in primary molars. METHODS: A survey with eight cases of class II carious lesions was emailed to American Academy of Pediatric Dentistry members, who were asked to choose either a stainless steel crown (SSC) or composite resin as a final restoration, or no treatment. Treatment decisions were compared to evidence-based treatment recommendations. Repeated measures logistic regression was used to determine factors associated with treatment decisions...
January 15, 2018: Journal of Dentistry for Children
https://www.readbyqxmd.com/read/29661580/preparation-and-characterization-of-bis-gma-free-dental-composites-with-dimethacrylate-monomer-derived-from-9-9-bis-4-2-hydroxyethoxy-phenyl-fluorene
#11
Jingwei He, Hilde M Kopperud
OBJECTIVE: Synthesize a new BPA-free monomer for use in methacrylate-based materials and evaluate critical properties of resin and composite materials based on the monomer. METHODS: Bis-EFMA was synthesized through reaction between 9,9-bis[4-(2-hydroxyethoxy)-phenyl]fluorene and 2-(methacryloyloxy)ethyl isocyanate. Experimental Bis-EFMA-based resin (Bis-EFMA/TEGDMA=50/50, wt./wt.) and composite were prepared. Critical properties were investigated according to standard or referenced methods Bis-GMA/TEGDMA (50/50, wt...
April 13, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29659637/-restoration-of-pathological-tooth-wear
#12
K B Wabeke
On account of tooth wear, a 30-year-old man and a 23-year-old woman were referred to a clinic for specialised dental services by their general dentist. The man suffered from degradation of hard dental tissues. He was not in pain but had some functional problems. In addition, the diminishing aesthetics bothered him. The woman suffered from pain frequently, had mild functional complaints and a deep bite. Treatment of pathological tooth wear begins with a sound diagnosis and investigating and eliminating aetiological factors...
April 2018: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/29658566/peek%C3%A2-biphasic-bioceramic-composites-promote-mandibular-defect-repair-and-upregulate-bmp%C3%A2-2-expression-in-rabbits
#13
Hedong Yu, Yongji Chen, Min Mao, Dongyan Liu, Jun Ai, Weidong Leng
The present study aimed to investigate whether bone morphogenetic protein‑2 (BMP‑2) was involved in the repair of mandibular defects using polyether‑ether‑ketone biphasic bioceramic (PEEK‑BBC) composites in rabbits. PEEK‑BBC composites with abundant and interconnected pores were prepared by calcination and characterized by scanning electron microscope. A mandibular defect model in rabbits was established using dental grinder to produce a square hole. A total of 60 rabbits were divided into four groups: Control, sham, surgery, and PEEK...
April 11, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29657526/comparative-abrasive-wear-resistance-and-surface-analysis-of-dental-resin-based-materials
#14
Maleeha Nayyer, Shahreen Zahid, Syed Hammad Hassan, Salman Aziz Mian, Sana Mehmood, Haroon Ahmed Khan, Muhammad Kaleem, Muhammad Sohail Zafar, Abdul Samad Khan
Objective: The objective of this study was to assess the surface properties (microhardness and wear resistance) of various composites and compomer materials. In addition, the methodologies used for assessing wear resistance were compared. Materials and Methods: This study was conducted using restorative material (Filtek Z250, Filtek Z350, QuiXfil, SureFil SDR, and Dyract XP) to assess wear resistance. A custom-made toothbrush simulator was employed for wear testing...
January 2018: European Journal of Dentistry
https://www.readbyqxmd.com/read/29656232/gallium-incorporation-into-phosphate-based-glasses-bulk-and-thin-film-properties
#15
Bryan W Stuart, Colin A Grant, George E Stan, Adrian C Popa, Jeremy J Titman, David M Grant
The osteogenic ions Ca2+ , P5+ , Mg2+ , and antimicrobial ion Ga3+ were homogenously dispersed into a 1.45 µm thick phosphate glass coating by plasma assisted sputtering onto commercially pure grade titanium. The objective was to deliver therapeutic ions in orthopaedic/dental implants such as cementeless endoprostheses or dental screws. The hardness 4.7 GPa and elastic modulus 69.7 GPa, of the coating were comparable to plasma sprayed hydroxyapatite/dental enamel, whilst superseding femoral cortical bone...
March 30, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29650250/thermo-setting-glass-ionomer-cements-promote-variable-biological-responses-of-human-dental-pulp-stem-cells
#16
Mar Collado-González, Miguel R Pecci-Lloret, Christopher J Tomás-Catalá, David García-Bernal, Ricardo E Oñate-Sánchez, Carmen Llena, Leopoldo Forner, Vinicius Rosa, Francisco J Rodríguez-Lozano
OBJECTIVE: To evaluate the in vitro cytotoxicity of Equia Forte (GC, Tokyo, Japan) and Ionostar Molar (Voco, Cuxhaven, Germany) on human dental pulp stem cells (hDPSCs). METHODS: hDPSCs isolated from third molars were exposed to several dilutions of Equia Forte and Ionostar Molar eluates (1/1, 1/2 and 1/4). These eluates were obtained by storing material samples in respective cell culture medium for 24h (n=40). hDPSCs in basal growth culture medium were the control...
April 9, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29645367/saliva-and-gastrointestinal-functions-of-mastication-taste-and-textural-perception-swallowing-and-initial-digestion
#17
Anne Marie Lynge Pedersen, Christiane E Sørensen, Gordon Proctor, Guy Carpenter
Saliva exerts multiple functions in relation to the initial digestive processes taking place in the upper parts of the gastrointestinal tract. Ingestion of food and beverages, in turn, is a strong stimulus for secretion of saliva with a differential composition depending on the neuronal stimulation pattern. This review paper provides insight into the mechanisms by which saliva acts in relation to taste, mastication, bolus formation, enzymatic digestion, and swallowing. Also the protective functions of saliva including maintenance of dental and mucosal integrity will be discussed as they indirectly influence the digestive process...
April 12, 2018: Oral Diseases
https://www.readbyqxmd.com/read/29628646/antibacterial-activity-of-dental-restorative-material-an-in-vitro-study
#18
Nishmitha N Hegde, Shruthi H Attavar, Mithra N Hegde, G Priya
Aim: The study evaluated the antibacterial effects of dental restorations such as nano-hybrid composite (Empress), a glass ionomer cement (GIC Gold label Type 9) and silver amalgam against Streptococcus mutans . Materials and Methods: A modified bacterial suspension within the material assay was used to study the antibacterial effects. A volume of 20 μl of bacterial suspensions were placed in a narrow conical cavity within the materials. They were incubated for 0, 3, 6, 12, 24, and 48 h at 37°C...
January 2018: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29627738/polymerization-shrinkage-stress-of-resin-based-dental-materials-a-systematic-review-and-meta-analyses-of-composition-strategies
#19
REVIEW
Carine Tais Welter Meereis, Eliseu Aldrighi Münchow, Wellington Luiz de Oliveira da Rosa, Adriana Fernandes da Silva, Evandro Piva
PURPOSE: A systematic review was conducted to determine whether there were composition strategies available to reduce and control polymerization shrinkage stress development in resin-based restorative dental materials. DATA SOURCES: This report was reported in accordance with the PRISMA Statement. Two reviewers performed a literature search up to December 2016, without restriction of the year of publication, in seven databases: PubMed, Web of Science, Scopus, SciELO, LILACS, IBECS, and BBO...
March 23, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29627213/macro-and-microtopographical-examination-and-quantification-of-cad-cam-composite-resin-2-and-3-body-wear
#20
Carolin Stöckl, Rüdiger Hampe, Bogna Stawarczyk, Miriam Haerst, Malgorzata Roos
STATEMENT OF PROBLEM: The selection of an appropriate restorative material based on wear behavior is important for the long-term success of a dental restoration. For computer-aided design and computer-aided manufacturing (CAD-CAM) composite resins, information about their wear resistance and wear mechanism is scarce. PURPOSE: The purpose of this in vitro study was to compare the 2- and 3-body wear of CAD-CAM composite resins with that of lithium disilicate ceramic and to develop analysis software...
April 5, 2018: Journal of Prosthetic Dentistry
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