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Dental Materials Journal

Omar Alsadon, David Patrick, Anthony Johnson, Sarah Pollington, Duncan Wood
The objectives were to evaluate the fracture resistance and stress concentration in zirconia/composite veneered crowns in comparison to zirconia/porcelain crowns using occlusal fracture resistance and by stress analysis using finite element analysis method. Zirconia substructures were divided into two groups based on the veneering material. A static load was applied occlusally using a ball indenter and the load to fracture was recorded in Newtons (N). The same crown design was used to create 3D crown models and evaluated using FEA...
February 11, 2017: Dental Materials Journal
Motohiro Uo, Takahiro Wada, Kiyotaka Asakura
The bioactive effects of strontium released from surface pre-reacted glass-ionomer (S-PRG) fillers may aid in caries prevention. In this study, the local structure of strontium taken up by teeth was estimated by extended X-ray absorption fine structure analysis. Immersing teeth into S-PRG filler eluate increased the strontium content in enamel and dentin by more than 100 times. The local structure of strontium in enamel and dentin stored in distilled water was the same as that in synthetic strontium-containing hydroxyapatite (SrHAP)...
February 11, 2017: Dental Materials Journal
Manamu Nagakura, Yasuhiro Tanimoto, Norihiro Nishiyama
The use of non-metal clasp denture (NMCD) materials may seriously affect the remaining tissues because of the low rigidity of NMCD materials such as polyamides. The purpose of this study was to develop a high-rigidity glass fiber-reinforced thermoplastic (GFRTP) composed of E-glass fiber and polyamide-6 for NMCDs using an injection molding. The reinforcing effects of fiber on the flexural properties of GFRTPs were investigated using glass fiber content ranging from 0 to 50 mass%. Three-point bending tests indicated that the flexural strength and elastic modulus of a GFRTP with a fiber content of 50 mass% were 5...
February 11, 2017: Dental Materials Journal
Taro Yoshizaki, Norihisa Akiba, Masanao Inokoshi, Masayuki Shimada, Shunsuke Minakuchi
Preventing microorganisms from adhering to the denture surface is important for ensuring the systemic health of elderly denture wearers. Silica coating agents provide high hydrophilicity but lack durability. This study investigated solutions to improve the durability of the coating layer, determine an appropriate solid content concentration of SiO2 in the silica coating agent, and evaluate the effect of adding platinum (Pt) and diamond nanoparticles (ND) to the agent. Five coating agents were prepared with different SiO2 concentrations with/without Pt and ND additives...
February 11, 2017: Dental Materials Journal
Sibel Dikicier, Simel Ayyildiz, Julide Ozen, Cumhur Sipahi
The purpose of this study was to investigate the flexural strength of all-ceramics with varying core thicknesses submitted to aging. In-Ceram Alumina (IC), IPS e.max Press (EM) and Katana (K) (n=40), were selected. Each group contained two core groups based on the core thickness as follows: IC/0.5, IC/0.8, EM/0.5, EM/0.8, K/0.5 and K/0.8 mm in thickness (n=20 each). Ten specimens from each group were subjected to aging and all specimens were tested for strength in a testing machine either with or without being subjected aging...
February 11, 2017: Dental Materials Journal
Koichi Shinkai, Yoshihisa Taira, Satoki Kawashima, Shiro Suzuki, Masaya Suzuki
The aim of this study was to histologically evaluate direct pulp capping using different all-in-one adhesives in rat teeth. Five all-in-one adhesives and a control material (MTA) were used. Each material was applied on the exposed pulp, and each cavity was subsequently restored with the resin composite. Rats were sacrificed 14 days after the surgical procedure. Serial stained sections were histologically evaluated for examining pulp tissue disorganization (PTD), inflammatory cell infiltration (ICI), dentin bridge formation (DBF), and bacterial penetration (BP)...
February 11, 2017: Dental Materials Journal
Akimasa Tsujimoto, Wayne W Barkmeier, Toshiki Takamizawa, Mark A Latta, Masashi Miyazaki
The purpose of this study was to investigate the depth of cure, flexural properties and volumetric shrinkage of low and high viscosity bulk-fill giomers and resin composites. Depth of cure and flexural properties were determined according to ISO 4049, and volumetric shrinkage was measured using a dilatometer. The depths of cure of giomers were significantly lower than those of resin composites, regardless of photo polymerization times. No difference in flexural strength and modulus was found among either high or low viscosity bulk fill materials...
February 1, 2017: Dental Materials Journal
Liliana Porojan, Florin Topală, Sorin Porojan, Cristina Savencu
The objective of this investigation was to compare alternative framework designs of molar zirconia crowns veneered with various overpressing ceramics and to predict the biomechanical behavior based on the stress evaluation. The hypothesis of the study is that the zirconia framework design and type of the veneering material, using the same technological procedure, may influence the biomechanical behavior of the restorations. Three geometric models with differential coping designs (uniform thickness, cutback and buccal reduction) were developed and two types of hot-pressed ceramics (leucite and lithium disilicate reinforced) were analyzed for the veneers...
February 1, 2017: Dental Materials Journal
Hiroyuki Tanimoto, Norihisa Akiba, Toshinari Nakamura, Huizi Zhao, Hirona Suzuki, Akira Uno, Motohiro Uo, Shunsuke Minakuchi
The purpose of this study was to investigate methods for evaluating objectively the removability of three commercially available home reliners (Cushion Correct, Tafugurippu Pink A and Liodent Pink). After immersing each of the reliners in distilled water at 37ºC for 24 h, we compared their removability using the peel test with a finger, which was evaluated based on a visual analogue scale and the percentage of the residual area. An experimental rake-up test was also undertaken to quantify removability, evaluated based on the total amount of work required to remove it...
February 1, 2017: Dental Materials Journal
Liudi Zhang, Christopher Joubert, George Bruder, Kai Yang, Alexa Aseel-Fine, Keith Jones, Miriam Rafailovich
We have shown that Computed Microtomography (CMT) is able to map the internal distribution of the filler particles in ProTaper(TM), Lexicon(TM), and GuttaCore(TM) materials, and explain the differences in their tensile and ductility properties, prior to mechanical manipulation. Working of uncrosslinked ProTaper™ and Lexicon(TM) samples resulted in a five-fold increase in ductility and the tensile elongation at break. CMT mapping of the internal structure showed that large, periodic, striations formed across the interior of the sample corresponding to the formation of regions with low filler particle density...
February 1, 2017: Dental Materials Journal
Fernando Torres-Méndez, Gabriel-Alejandro Martinez-Castañon, Iranzihuatl Torres-Gallegos, Norma-Verónica Zavala-Alonso, Nuria Patiño-Marin, Nereyda Niño-Martínez, Facundo Ruiz
The objective was to evaluate the effect of adding silver nanoparticles into three commercial adhesive systems (Excite™, Adper Prompt L-Pop™ and AdheSE™). Nanoparticles were prepared by a chemical method then mixed with the commercial adhesive systems. This was later applied to the fluorotic enamel, and then micro-tensile bond strength, contact angle measurements and scanning electron microscopy observations were conducted. The commercial adhesive systems achieved the lowest micro-tensile bond strength (Excite™: 11...
February 1, 2017: Dental Materials Journal
Coretta Fergus, Mariana Santos, Steven Soo, Haralampos Petridis
The purpose of this study was to investigate the effect of different chemical intra-oral prosthesis cleansers on the surface properties of Parylene-C coated and non-coated poly-methylmethacrylate (PMMA). A total of 120 PMMA samples were prepared. Half of the samples were coated with 10 µm of Parylene-C. Samples were exposed to either air (control) or one of two types of denture cleansers, an alkaline peroxide cleanser (Steradent) or a neutral peroxide cleanser with enzyme (Poligrip). Surface roughness (Ra) and surface free energy (SFE) values were measured and compared between groups...
January 20, 2017: Dental Materials Journal
Yuan Zhou, Khairul Matin, Yasushi Shimada, Yasunori Sumi, Junji Tagami
The aim of this study was to evaluate the effect of resin infiltration on root caries induced by Streptococcus mutans biofilms. Human premolar specimens were divided to 5 groups: negative control (NC), Clearfil SE Bond (SEB), Icon-etch120s+Icon-infiltrant (HA120), Icon-etch10s+Icon-infiltrant (HA10) and K-etchant10s+Icon-infiltrant (PA10). The resin penetration was observed by fluorescent microscope. Biofilm-induced demineralization was conducted again and observed by swept-source optical coherence tomography and confocal laser scanning microscope...
January 20, 2017: Dental Materials Journal
Noha A El-Wassefy
This study investigated the combining effect of cold plasma and bioglass-phosphoric acid paste on demineralized enamel. Fifty bovine incisors' enamel specimens were challenged by a demineralization solution of pH 4.47 for 72 h. Specimens were divided into five groups: (I) Control, demineralized enamel (C); (II) Demineralized enamel treated with fluoride varnish (F); (III) Cold plasma application to demineralized enamel (P); (IV) Demineralized enamel treated with bioglass paste (B); (V) Application of bioglass paste to cold plasma-treated demineralized enamel (PB)...
January 20, 2017: Dental Materials Journal
Nur Najiha Saarani, Kalitheerta Jamuna-Thevi, Neelam Shahab, Hendra Hermawan, Syafiqah Saidin
A guided bone regeneration (GBR) membrane has been extensively used in the repair and regeneration of damaged periodontal tissues. One of the main challenges of GBR restoration is bacterial colonization on the membrane, constitutes to premature membrane degradation. Therefore, the purpose of this study was to investigate the antibacterial efficacy of triple-layered GBR membrane composed of poly(lactic-co-glycolic acid) (PLGA), nanoapatite (NAp) and lauric acid (LA) with two types of Gram-negative periodontal bacteria, Fusobacterium nucleatum and Porphyromonas gingivalis through a disc diffusion and bacterial count tests...
January 20, 2017: Dental Materials Journal
Visnja Katic, Lidija Curkovic, Magdalena Ujevic Bosnjak, Kristina Peros, Davor Mandic, Stjepan Spalj
Aim was to determine effect of pH, fluoride (F(-)) and hydrofluoric acid concentration (HF) on dynamic of nickel (Ni(2+)) and titanium (Ti(4+)) ions release. Nickel-titanium wires with untreated surface (NiTi), rhodium (RhNiTi) and nitride (NNiTi) coating were immersed once a week for five min in remineralizing agents, followed by immersion to artificial saliva. Ion release was recorded after 3, 7, 14, 21 and 28 days. Pearson correlations and linear regression were used for statistical analysis. Release of Ni(2+) from NiTi and NNiTi wires correlated highly linearly positively with HF (r=0...
January 20, 2017: Dental Materials Journal
Aftab Ahmed Khan, Abdulaziz Abdullah Al Kheraif, Jamaluddin Syed, Darshan Devang Divakar, Jukka Pekka Matinlinna
Experimental silane primers and a urethane dimethacrylate resin were prepared to resin titanium bonding. Commercially pure 2 Ti coupons were pretreated and randomly assigned into groups: group-SM (ESPE Sil™+Multilink(®) Speed), group-SE (ESPE Sil™+experimental resin), group-AM (1.0 vol% 3-acryloxypropyltrimethoxysilane+Multilink(®) Speed), group-AE (1.0 vol% 3-acryloxypropyltrimethoxysilane+experimental resin), group-BM (1.0 vol% 3-acryloxypropyltrimethoxysilane+0.5 vol% bis-(1,2-triethoxysilyl)ethane+Multilink(®) Speed), and group-BE (1...
January 20, 2017: Dental Materials Journal
Masami Arai, Tomohiro Takagaki, Akifumi Takahashi, Junji Tagami
This study aimed to evaluate the bond strength of a resin cement to yttria-stabilized tetragonal zirconia polycrystals (Y-TZPs) treated with three different phosphate functional monomers containing primers by measuring the water contact angle. Seventy Y-TZP discs were divided into seven experimental groups (n=10), including an untreated (control) group. Specimens were treated with one of the following monomers: MDP (MD), GPDM (GP), and Phenyl-P (PP). After primer application and air drying, half the treated specimens were ultrasonically cleaned in ethanol for 2 min (MD-e, GP-e, and PP-e), and contact angles were measured...
January 20, 2017: Dental Materials Journal
Philipp Raab, Christos Alamanos, Sebastian Hahnel, Dimitrios Papavasileiou, Michael Behr, Martin Rosentritt
Unsuccessfully sealed screw access channels of prosthetic implant abutments may lead to malodor or peri-implant diseases in gingival tissues adjacent to implant-supported restorations. Therefore, 72 sets of screw channel analogs with six different materials incorporated (Polytetrafluoroethylene (PTFE), wax, gutta-percha, cavit, endofrost-pellets and cotton pellets) were exposed (2.5 h, 37°C) to Streptococcus mutans, oralis and Candida albicans suspensions. Bacterial adherence was quantified by using the fluorescence dye, Alamar Blue/resazurin, and an automated multifunctional reader...
January 20, 2017: Dental Materials Journal
Merve Bankoğlu Güngör, Bilge Turhan Bal, Handan Yilmaz, Cemal Aydin, Seçil Karakoca Nemli
The purpose of the present study was to evaluate and compare the fracture strength and failure modes of endocrowns, zirconia post, and fiber post supported restorations and predict the clinical outcomes of six different prostheses used for endodontically treated teeth. Sixty (n=10) maxillary central incisors were restored with zirconia post/resin-nano-ceramic crown (ZrRNC), fiber post/resinnano-ceramic crown (FbRNC), zirconia post/lithium disilicate ceramic crown (ZrLDS), fiber post/lithium disilicate ceramic crown (FbLDS), resin-nano-ceramic endocrown (EndoRNC), and lithium disilicate ceramic endocrown (EndoLDS)...
January 20, 2017: Dental Materials Journal
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