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Dental Materials Journal

Bo Wang, Ning Zhang, Xiaomeng Wang, Soo Ro Park, Michael D Weir, Thomas W Oates, Hockin H K Xu, Yuxing Bai
Enamel demineralization is the most undesired side-effect of fixed orthodontic treatments. This study were to develop a novel adhesive that is self-etching instead of using the traditional etching method, and to form a sealant on the enamel to prevent demineralization. 2-methacryloyloxyethyl phosphorylcholine (MPC) and quaternary ammonium dimethylaminohexadecyl methacrylate (DMAHDM) were mixed into a self-etch adhesive (Adper Easy One, 3M, St. Paul, MN, USA; referred to as AEO). Enamel shear bond strength (SBS) was measured...
July 12, 2018: Dental Materials Journal
Takuya Murata, Toshio Maseki, Yoichiro Nara
The effects of immediate dentin sealing (IDS) applications on the bonding of computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic onlay restorations after cyclic loading were examined. Standardized mesial-distal-occlusal-palatal cavities in 32 extracted human molars were prepared. The cavities were divided into four groups: those receiving thin-layered (T), slope-shaped (S), and base-shaped (B) sealing, and the non-sealing group (N) as a control. The intra-cavity dentin walls of the T, S, and B groups were sealed with an all-in-one adhesive and a flowable composite...
July 12, 2018: Dental Materials Journal
Ayako Nakamoto, Masaomi Ikeda, Noriko Hiraishi, Toru Nikaido, Motohiro Uo, Junji Tagami
The purpose of this study was to evaluate the effect of fluoride mouthrinses on dentin bonding performance of a two-step selfetch adhesive; Clearfil SE Bond. Bovine root dentin surface was treated with either 450, 900, or 9,000 ppm F solutions for 30 s (immediate), and continually treated for one month (one month) before the bonding procedures. Microtensile bond strength (µTBS) test and scanning electron microscopic (SEM) observation of the acid-base resistance zone (ABRZ) were performed. Chemical state of fluorine on dentin surface was analyzed by X-ray absorption fine structure (XAFS)...
July 12, 2018: Dental Materials Journal
Chris S Ivanoff, Timothy L Hottel, Franklin Garcia-Godoy
The effect of a cylindrical crosshead on shear bond strength of composite to dentin was assessed by finite element analysis (FEA) after shear bond testing thirty mandibular molars restored with composite cylinders (Tetric EvoCeram-3 mm diameter) perpendicular to conditioned dentin. Cross-sectional geometric models were created with quadrilateral linear plane stress elements. Stress distributions for normal, shear, and major principal stresses were plotted. Mean shear bond strength for the experimental group was 23...
July 12, 2018: Dental Materials Journal
Roberta Condo', Luca Pazzini, Loredana Cerroni, Guido Pasquantonio, Giuseppina Lagana', Alessandro Pecora, Valentina Mussi, Antonio Rinaldi, Barbara Mecheri, Silvia Licoccia, Luca Maiolo
Aim of this in vitro study was to analyze structural properties of two different polymeric orthodontic aligners, Exceed30 (EX30) and Smart Track (LD30), before and after use. Forty patterns of aligners were randomly selected: 20 LD30 and 20 EX30, worn intra-orally for 14±3 days, 22 h/day. From each aligner, 10 specimens were prepared from buccal surfaces of the incisor region by the cutting of samples 5×5 mm under a stereomicroscope. All samples were subjected to Fourier transform infrared spectroscopy, micro-Raman spectroscopy, X-ray diffraction, tensile and indentation strength test...
July 12, 2018: Dental Materials Journal
Xiaomeng Wang, Ning Zhang, Bo Wang, Soo Ro Park, Michael D Weir, Hockin H K Xu, Yuxing Bai
Enamel demineralization is one of the most undesired side effects of fixed orthodontic treatment, which will lead to white spot lesions (WSLs) on tooth surfaces. The development of WSLs is due to prolonged accumulation of bacterial plaque and associated acid production. Self-etching adhesives have been used in orthodontic treatments with several advantages over the more traditional acid-etch method. However, current self-etching adhesives in orthodontic treatments have no antibacterial activity. The objectives of this study were to develop a self-etching and antibacterial orthodontic adhesive, and to investigate its enamel bond strength and antibacterial properties...
July 12, 2018: Dental Materials Journal
Guangyun Lai, Liya Zhao, Jun Wang, Karl-Heinz Kunzelmann
This study evaluated surface gloss, roughness and color change of six current flowable composites after simulated toothbrushing, including four traditional flowable composites (i.e. GrandioSO Flow, Arabesk Flow, Kerr Revolution Formula 2 and Gradia Direct LoFlo), one self-adhering flowable composite (Kerr Vertise Flow) and one universal injectable composite (G-ænial Universal Flo). Forty-eight dimensionally standardized specimens (n=8/group) were made from six composites. Before and after 1 h toothbrushing simulation, surface gloss was measured with a glossmeter, and surface roughness was evaluated with a profilometer, and color was measured with a spectrophotometer...
July 12, 2018: Dental Materials Journal
Kensuke Igarashi, Ken Nakahara, Eizaburo Kobayashi, Fumihiko Watanabe, Maiko Haga-Tsujimura
The objective of the present study was to assess hard and soft tissue around dental implants made of three different materials with microgrooves on the collar surface. Microgrooved implants were inserted in the mandibles of five male beagles. Implants were made of three kinds of material; titanium (Ti), yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and ceria partially stabilized zirconia/alumina nanocomposite (Ce-TZP/Al2 O3 ). The animals were euthanatized at three months after implantation, and harvested tissue was analyzed by means of histology...
July 12, 2018: Dental Materials Journal
Anja Liebermann, Caroline Freitas Rafael, Ana Elisa Colle Kauling, Daniel Edelhoff, Kazuhiko Ueda, Andreas Seiffert, Claudia Angela Maziero Volpato, Jan-Frederik Güth
The aim of this study was to evaluate the transmittance of visible light (VL) (λ: 400-700 nm) and blue light (BL) (λ: 360-540 nm) through six CAD/CAM zirconia blanks (ZiB) in comparison to a lithium disilicate ceramic (LS2). Disks of the zirconia materials Bruxzir (BX), Cercon (CE), Lava Frame (LF), Lava Plus (LP), Prettau (PT), Zenostar (ZS) and LS2 (EM) were manufactured and the transmittance was measured in a spectrophotometer. ZS, followed by CE, PT, LP, LF, and BX showed the lowest transmittance of VL and BL...
July 12, 2018: Dental Materials Journal
Reo Ikumi, Takayuki Miyahara, Norio Akino, Noriko Tachikawa, Shohei Kasugai
The effectiveness of a previously developed unsintered hydroxyapatite (uHA) and poly(L-lactic acid) (PLLA) hydrophilic membrane as a resorbable barrier for guided bone regeneration (GBR) was evaluated. Critical-size 8-mm diameter bone defects were surgically generated in the parietal bones of 24 12-week-old male Wistar rats, which were then divided into three groups in which either a uHA/PLLA or a collagen membrane or no membrane (control) was placed onto the bone defect. Following sacrifice of the animals 2 or 4 weeks after surgery, bone defects were examined using microcomputed tomography and histological analysis...
June 29, 2018: Dental Materials Journal
Yu Tsuyuki, Toru Sato, Syuntaro Nomoto, Mamoru Yotsuya, Teruyoshi Koshihara, Shinji Takemoto, Masao Yoshinari
The aim of this study was to investigate the effects of occlusal form of abutment, occlusal thickness of monolithic zirconia crowns (MZC), and cement type on the fracture load of MZC. Abutments were prepared with 2 types of occlusal forms: groove-type and flat-type. These were designed so that thickness at the central fissure region of MZC was 0.3, 0.5, or 0.7 mm. Glass ionomer cement and resin cement were used to lute MZC to their corresponding abutment. Fracture load was determined using a universal testing machine...
June 29, 2018: Dental Materials Journal
Xiao-Ming Zhu, Jian-Feng Zhou, Heng Guo, Xiao-Fei Zhang, Xiao-Qiang Liu, He-Ping Li, Jian-Guo Tan
The radio-frequency atmospheric-pressure glow discharge (RF-APGD) plasma is a novel cold atmospheric plasma (CAP) source, which has low energy characteristic. This study investigated the effect of RF-APGD plasma on the mechanical properties of dentin collagen and resin-dentin bonding. The scanning electron microscopy analysis was performed before and after a novel RF-APGD plasma and a conventional CAP treatment and a tensile test was carried out for the stiffness of dentin collagen. The microtensile resin-dentin bond strength was tested either immediately or after a 50,000-cycle thermocycling process...
June 29, 2018: Dental Materials Journal
Feng Luo, Guang Hong, Tong Wang, Lingling Jia, Jun-Yu Chen, Lai Suo, Xi-Bo Pei, Qian-Bing Wan
This study evaluated the wettability of commercial vinyl polysiloxane impression materials by measuring contact angles on horizontal and non-horizontal surfaces using artificial saliva. Three light bodies (Affinis [Affi], Silagum [Sila] and Variotime [Vario-LB]) and one extra light body (Viriotime [Vario-ELB]) were prepared with flat surfaces. Static and dynamic contact angles were measured using the sessile drop method as a function of time. Contact angle hysteresis was the value of advancing contact angle minus receding contact angle...
June 29, 2018: Dental Materials Journal
Yuan Zhou, Yasushi Shimada, Khairul Matin, Alireza Sadr, Masahiro Yoshiyama, Yasunori Sumi, Junji Tagami
The purpose of this study was to compare optical properties of root caries under two observing conditions using swept-source optical coherence tomography (SS-OCT). In vitro and natural root caries were observed by SS-OCT under wet and dry conditions, followed by confocal laser scanning microscope (CLSM) and transverse microradiography (TMR). Signal intensity (SI), distance between SI peaks (SI-distance) and optical lesion depth were obtained from OCT. Lesion depth was measured from CLSM; lesion depth (LDTMR ) and mineral loss (ML) were obtained from TMR...
June 29, 2018: Dental Materials Journal
Xiuzhi Fei, Zeyang Wang, Wei Zhong, Yinglou Li, Yanyu Miao, Longbo Zhang, Yuegui Jiang
This study was to compare the influence of glass fiber post placement and crown restoration on endodontically treated maxillary first premolars with severe NCCLs using three-dimensional finite element analysis and fracture resistance testing. G1, intact teeth. G2, teeth with artificial defect. G3, composite resin (CR). G4, CR and fiber post in buccal canal (FPB). G5, CR and fiber post in palatal canal (FPP). G6, CR and fiber posts in buccal and palatal canals (FPBP). G7, CR and crown (C). G8, CR, FPB, C. G9, CR, FPP, C...
June 29, 2018: Dental Materials Journal
Junji Atomura, Go Inoue, Toru Nikaido, Keisuke Yamanaka, Motohiro Uo, Junji Tagami
FCP-COMPLEX is a newly developed solution containing fluoride, calcium, and phosphoric acid that has the potential to reinforce caries-affected dentin. This study evaluated the effect of FCP-COMPLEX on micro-tensile bond strength (µTBS) and acid-challenge at the dentin-adhesive interface. FCP-COMPLEX, 2% NaF, and distilled water were applied to artificial caries-affected dentin (ACAD) and the effect on acid-induced damage after resin composite restoration was observed. Scanning electron microscopy and X-ray absorption fine structure (XAFS) were used to evaluate tooth morphology...
June 20, 2018: Dental Materials Journal
Zhongjun Liu, Xinyuan Zhao, Xiongqun Zeng, Shuaimei Xu, Yu Lu, Dingming Huang
Resin adhesive restorations are susceptible to oral fluid contamination and greatly influenced by dentinal tubule fluid because of pulpal pressure, especially when the restorative cavities are near gingival tissues. This study designed a novel model to evaluate the microleakage of self-adhesive flowable composite and traditional resin adhesives under simulated subgingival cavity preparations and pulpal pressure. We applied three different adhesive systems, include Vertise Flow, Optibond all-in-one, and Optibond S, on premolars with V-shaped cavity...
June 20, 2018: Dental Materials Journal
Xavier Struillou, Aurélien Fruchet, Mia Rakic, Zahi Badran, Gildas Rethore, Sophie Sourice, Borhane Hakim Fellah, Laurent LE Guehennec, Olivier Gauthier, Pierre Weiss, Assem Soueidan
The aim of the study was to evaluate bone regeneration using a canine model with surgically created periodontal defects filled for 12 weeks using a stratified biomaterial consisting in a biphasic calcium phosphate (BCP) covered with a crosslinking hydrogel acting as polymer membrane of silated hydroxypropyl methylcellulose (Si-HPMC) as the tested new concept. Bilateral, critical-sized, defects were surgically created at the mandibular premolar teeth of six adult beagle dogs. The defects were randomly allocated and: (i) left empty for spontaneous healing or filled with: (ii) BCP and a collagen membrane; (iii) BCP and hydrogel Si-HPMC membrane...
June 20, 2018: Dental Materials Journal
Mohammed M Gad, Ahmed Rahoma, Ahmad M Al-Thobity
The current study evaluated the effects of autoclave polymerization both with and without glass fiber (GF) reinforcement on the surface roughness and hardness of acrylic denture base material. Ninety disc specimens (30×2.5 mm) were prepared from Vertex resin and divided according to polymerization techniques into a water bath, short and long autoclave polymerization groups. Tested groups were divided into three subgroups according to the GF concentration (0, 2.5, and 5 wt%). Profilometer and Vickers hardness tests were performed to measure surface roughness and hardness...
June 20, 2018: Dental Materials Journal
Nathalia Albrecht, Tatiana Kelly DA Silva Fidalgo, Maria José Santos DE Alencar, Lucianne Cople Maia, Vanessa Migliorini Urban, Karin Hermana Neppelenbroek, Kátia Rodrigues Reis
Two soft denture lining materials (SC-Soft Confort and TS-Trusoft) were investigated with and without the addition of 1.0% of chlorhexidine diacetate (1.0% CHX). To assess peel bond strength, specimens (75×10×6 mm) were submitted to a peel test at 10 mm/min immediately and after 24 h. To evaluate Candida albicans growth inhibition, disc of specimens (10×3 mm) were immersed in a solution with 3×106 CFU/mL of C. albicans, and spectral measurements were made following immersion in MTT solution for 2, 4, and 6 days...
June 20, 2018: Dental Materials Journal
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