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Laser dental

Nadine Kommerein, Katharina Doll, Nico S Stumpp, Meike Stiesch
Peri-implant infections are the most common cause of implant failure in modern dental implantology. These are caused by the formation of biofilms on the implant surface and consist of oral commensal and pathogenic bacteria, which harm adjacent soft and hard tissues and may ultimately lead to implant loss. In order to improve the clinical situation, there has to be a better understanding of biofilm formation on abiotic surfaces. Therefore, we successfully developed a system to cultivate an oral multispecies biofilm model in a flow chamber system, optimized for the evaluation of biofilm formation on solid materials by direct microscopic investigation...
2018: PloS One
Rodrigo Rocha Maia, Dayane Oliveira, Tracy D'Antonio, Fang Qian, Frederick Skiff
Objectives: To evaluate and compare light-transmittance in dental tissues and dental composite restorations using the incremental double-layer technique with varying layer thickness. Materials and Methods: B1-colored natural teeth slabs were compared to dental restoration build-ups with A2D and B1E-colored nanofilled, supra-nanofilled, microfilled, and microhybrid composites. The enamel layer varied from 0.3, 0.5, or 1.2 mm thick, and the dentin layer was varied to provide a standardized 3...
May 2018: Restorative Dentistry & Endodontics
I V Smirnov, J V Rau, M Fosca, A De Bonis, A Latini, R Teghil, V I Kalita, A Yu Fedotov, S V Gudkov, A E Baranchikov, V S Komlev
In the present study, the Pulsed Laser Deposition (PLD) technique was applied to coat titanium for orthopaedic and dental implant applications. Calcium carbonate (CC) was used as starting coating material. The deposited CC films were transformed into octacalcium phosphate (OCP) by chemical treatments. The results of X-ray diffraction (XRD), Raman, Fourier Transform Infrared Spectroscopy (FTIR) and scanning electron microscopy (SEM) studies revealed that the final OCP thin films are formed on the titanium surface...
June 2017: Bioactive Materials
María de Los Angeles Moyaho-Bernal, Rosalía Contreras-Bulnes, Laura Emma Rodríguez-Vilchis, Efraín Rubio-Rosas
Innovators conditioning protocols are emerged in permanent dentin, however for deciduous dentin the information is limited; the aim of this study was to evaluate in vitro diameter of deciduous and permanent dentinal tubules after several conditioning protocols. Eighty dentin samples were distributed in sixteen groups (n = 5 p/g) and dentin surface was conditioned as follow: G1D/G1P acid etching; G2D/G2P, self-etch adhesive; G3D/G3P, G4D/G4P, Er: YAG laser irradiation at 200 mJ-25.5 J/cm2 and 300 mJ-38.2 J/cm2 , at 10 Hz under water spray respectively; G5D/G5P, G6D/G6P, G7D/G7P, and G8D/G8P were irradiated under the same energy densities followed phosphoric acid or self-etch adhesive conditioning...
May 8, 2018: Microscopy Research and Technique
Piotr Żukowski, Mateusz Maciejczyk, Danuta Waszkiel
OBJECTIVE: An oral cavity is a place especially susceptible to oxidative damage. It is subjected to many environmental pro-oxidative factors or factors that have the ability to generate reactive oxygen species (ROS). The aim of this article is to present the main sources of ROS and oxidative stress in the oral environment. DESIGN: A literature search was performed using the PubMed and Google Scholar databases. RESULTS: One of the most important ROS sources in the oral cavity is periodontal inflammation...
May 1, 2018: Archives of Oral Biology
Maria Bizzarro, Chiara Generali, Saverio Maietta, Massimo Martorelli, Martina Ferrillo, Carlos Flores-Mir, Letizia Perillo
Objectives: To evaluate the association between maxillary dental arch transverse dimensions, palatal depths, palatal area and volume with buccally displaced canine (BDC) in mixed dentition subjects when compared to non-BDC subjects using laser scanner 3D technology. Materials and methods: Sixty Caucasian subjects, 8-11 years of age (mean, 9.26 ± 1.48 years), were included. In each group (BDC and non-BDC) 30 children were matched. Digital dental casts were obtained using a 3 Shape D700 laser scanner...
May 3, 2018: European Journal of Orthodontics
Xiucheng Hu, Ruogu Xu, Xiaolin Yu, Jianyu Chen, Shuangquan Wan, Jianglin Ouyang, Feilong Deng
Selective laser melting (SLM) has promising prospects in manufacturing customized implants, however the rough surface of SLM titanium can facilitate bacterial adherence and biofilm formation, which is a risk to implant success. Therefore, surface modification is required to enhance its antibacterial efficacy. Sandblasting, anodization and electrochemical deposition were applied to construct a novel composite nanostructure of nanophase calcium phosphate embedded to TiO<sub>2</sub> nanotubes on microrough SLM substrates (NTN)...
May 1, 2018: Biomedical Materials
Hanan Elgendy, Rodrigo Rocha Maia, Fredrick Skiff, Gerald Denehy, Fang Qian
OBJECTIVE: This study used three LASERs (red, green, and blue) with a spectrophotometer to compare the light propagation for the following: absorption (A), transmittance (T), attenuation (K), and scattering anisotropy coefficient (g) in dental tissues and nano-filled resin-based composites. This study used three distinct incremental build-up techniques, which included one shade (body), two shades (enamel and dentin), and three shades (enamel, transparent, and dentin). METHODS: Twenty human, un-erupted, recently extracted third molars (shade B1) were used to obtain 40 tooth slabs...
April 30, 2018: Clinical Oral Investigations
Aung Thu Hein, Young-Dan Cho, Ye-Hyeon Jo, Dae-Joon Kim, Jung-Suk Han
PURPOSE: This study was performed to evaluate the osteogenic potential of 3mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) and niobium oxide containing Y-TZPs with specific ratios, new (Y,Nb)-TZPs, namely YN4533 and YN4533/Al20 discs. MATERIALS AND METHODS: 3Y-TZP, YN4533 and YN4533/Al20 discs (15 mm diameter and 1 mm thickness) were prepared and their average surface roughness (Ra ) and surface topography were analyzed using 3-D confocal laser microscope (CLSM) and scanning electron microscope (SEM)...
April 2018: Journal of Advanced Prosthodontics
Marit Øilo, Harald Nesse, Odd Johan Lundberg, Nils Roar Gjerdet
STATEMENT OF PROBLEM: New additive manufacturing techniques for nonprecious alloys have made the fabrication of metal-ceramic fixed partial dentures (FPDs) less expensive and less time-consuming. However, whether the mechanical properties produced by these techniques are comparable is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the mechanical properties of cobalt-chromium frameworks for FPDs fabricated by 3 different techniques. MATERIAL AND METHODS: Thirty frameworks for 3-unit FPDs were fabricated by traditional casting, computer-aided design and computer-aided manufacturing (CAD-CAM) milling, and selective laser melting (SLM), with n=10 in each group...
April 25, 2018: Journal of Prosthetic Dentistry
Lingyan Peng, Li Chen, Bryan T Harris, Bikash Bhandari, Dean Morton, Wei-Shao Lin
STATEMENT OF PROBLEM: Although computer-aided design and computer-aided manufacturing (CAD-CAM) complete removable dental prostheses (CRDPs) have gained popularity, conventional impressions are still common for CAD-CAM CRDP treatment. These need to be digitized and converted into virtual edentulous casts with a laboratory impression scan protocol during prosthesis fabrication. How this can best be accomplished is unclear. PURPOSE: The purpose of this in vitro study was to compare the accuracy and reproducibility of virtual edentulous casts created by a dental laboratory laser scanner and a cone-beam computed tomography (CBCT) scanner with a digitized master cast...
April 24, 2018: Journal of Prosthetic Dentistry
B Beger, H Goetz, M Morlock, E Schiegnitz, B Al-Nawas
BACKGROUND: The aim of this study was to assess surface characteristics, element composition, and surface roughness of five different commercially available dental zirconia implants. Five zirconia implants (Bredent whiteSKY™ (I1), Straumann® PURE Ceramic (I2), ceramic.implant vitaclinical (I3), Zeramex® (I4), Ceralog Monobloc M10 (I5)) were evaluated. METHODS: The evaluation was performed by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and confocal laser scanning microscopy (CLSM)...
April 26, 2018: International Journal of Implant Dentistry
Xian Liu, Yun-Feng Yao, Xin-Yi Xu
PURPOSE: To compare the effect of Nd:YAP laser and Hoshino's triple antibiotic paste on root canal disinfection in the treatment of pulp revascularization, and to provide reference for root canal disinfection in dental pulp revascularization. METHODS: Forty immature permanent teeth diagnosed as acute or chronic periapical periodontitis were included. The periapical lesions and root development were recorded. The cases were divided into 2 groups: the control group and the Nd:YAP laser disinfection experimental group...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
Maria F Costa Pedro, Alessandro S Kalck, Kevin F Dos Santos, Marcos S Sousa, Karla B Romio, Paula C S Souto, Josmary R Silva, Nara C de Souza
The use of the layer-by-layer (LbL) deposition technique allows materials, such as drugs, to be self-assembled in multilayers with other electrolytes by combining their properties in a nanostructured system. Triclosan (TCS) is commonly used as a drug because of its bactericidal action, while erythrosine (ERY) has been used as a photosensitizer in photodynamic therapies because of its high light absorptivity in the visible region of the electromagnetic spectrum. The major advantage of investigating systems immobilized in LbL films is the benefit of characterizing the interaction through available substances in solid state techniques...
April 21, 2018: Photodiagnosis and Photodynamic Therapy
Bingchun Li, Xinlong Li, Huancai Lin, Yan Zhou
Streptococcus mutans (S. mutans) has been proved to be the main aetiological factor in dental caries. Curcumin, a natural product, has been shown to exhibit therapeutic antibacterial activity, suggesting that curcumin may be of clinical interest. The objective of this study is to evaluate the inhibitory effects of curcumin on metabolism and biofilm formation in S. mutans using a vitro biofilm model in an artificial oral environment. S. mutans biofilms were treated with varying concentrations of curcumin. The biofilm metabolism and biofilm biomass were assessed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay and the crystal violet assay...
2018: BioMed Research International
Antonio Profico, Stefan Schlager, Veronica Valoriani, Costantino Buzi, Marina Melchionna, Alessio Veneziano, Pasquale Raia, Jacopo Moggi-Cecchi, Giorgio Manzi
OBJECTIVES: We present two new automatic tools, developed under the R environment, to reproduce the internal and external structures of bony elements. The first method, Computer-Aided Laser Scanner Emulator (CA-LSE), provides the reconstruction of the external portions of a 3D mesh by simulating the action of a laser scanner. The second method, Automatic Segmentation Tool for 3D objects (AST-3D), performs the digital reconstruction of anatomical cavities. MATERIALS AND METHODS: We present the application of CA-LSE and AST-3D methods to different anatomical remains, highly variable in terms of shape, size and structure: a modern human skull, a malleus bone, and a Neanderthal deciduous tooth...
April 21, 2018: American Journal of Physical Anthropology
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
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
F F Dai, Y Liu, T M Xu, G Chen
OBJECTIVE: To explore a cone beam computed tomography (CBCT)-independent method for mandibular digital dental cast superimposition to evaluate three-dimensional (3D) mandibular tooth movement after orthodontic treatment in adults, and to evaluate the accuracy of this method. METHODS: Fifteen post-extraction orthodontic treatment adults from the Department of Orthodontics, Peking University School and Hospital of Stomatology were included. All the patients had four first premolars extracted, and were treated with straight wire appliance...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Luyuan Chen, Satoshi Komasa, Yoshiya Hashimoto, Shigeki Hontsu, Joji Okazaki
To enhance biocompatibility, osteogenesis, and osseointegration, we coated titanium implants, by krypton fluoride (KrF) pulsed laser deposition, with a thin film of fluoridated hydroxyapatite (FHA). Coating was confirmed by scanning electron microscopy (SEM) and scanning probe microscopy (SPM), while physicochemical properties were evaluated by attenuated reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Calcium deposition, osteocalcin production, and expression of osteoblast genes were significantly higher in rat bone marrow mesenchymal stem cells seeded on FHA-coated titanium than in cells seeded on uncoated titanium...
April 10, 2018: International Journal of Molecular Sciences
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