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https://www.readbyqxmd.com/read/29345455/3d-printing-of-bisphenol-a-free-polycarbonates
#1
Wei Zhu, Sang-Hyun Pyo, Pengrui Wang, Shangting You, Claire Yu, Jeffrey Alido, Justin Liu, Yew Leong, Shaochen Chen
Polycarbonates are widely used in food packages, drink bottles, and various healthcare products such as dental sealants and tooth coatings. However, bisphenol A (BPA) and phosgene used in the production of commercial polycarbonates poses major concerns to public health safety. Here, we report a green pathway to prepare BPA-free polycarbonates (BFPs) by thermal ring opening polymerization and photopolymerization. Polycarbonates prepared from two cyclic carbonates in different mole ratios demonstrated tunable mechanical stiffness, excellent thermal stability, and high optical transparency...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29344812/short-term-and-long-term-effects-of-osteoporosis-on-incisor-teeth-and-femoral-bones-evaluated-by-raman-spectroscopy-and-energy-dispersive-x-ray-analysis-in-ovariectomized-rats
#2
Fernanda Rossi Paolillo, Renan Arnon Romano, Luciana de Matos, Airton Abrahão Martin, Francisco Eduardo Gontijo Guimarães, Jarbas Caiado de Castro Neto, Vanderlei Salvador Bagnato
There are few published data on the relationship between loss of bone mass due to osteoporosis and poor tooth quality. This study analyzed the effects of osteoporosis on incisor teeth and femoral bones using optical techniques in rats. Twenty female Wistar rats aged 6 months (n = 20) were randomized into two groups: control group, non-ovariectomized rats (n = 10); ovariectomy group, ovariectomized rats to induce osteoporosis (n = 10). Each group was subdivided randomly into two groups containing five rats each as follows...
January 17, 2018: Journal of Bone and Mineral Metabolism
https://www.readbyqxmd.com/read/29329120/re-osseointegration-of-dental-implants-after-periimplantitis-treatments-a-systematic-review
#3
Marwa Madi, Moe Htet, Osama Zakaria, Adel Alagl, Shohei Kasugai
PURPOSE: This review considers possible surgical treatment modalities for induced periimplantitis to regain re-osseointegration as reported in the recent literature. MATERIALS AND METHODS: Electronic searches in MEDLINE/PubMed and Google Scholar databases were performed on experimental studies considering induced periimplantitis and attempts to achieve re-osseointegration from 2003 up to December 2016. Conflicts about articles were solved by authors' discussion...
January 11, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29327449/clinical-microbiological-and-cytomorphometric-evaluation-of-low-level-laser-therapy-as-an-adjunct-to-periodontal-therapy-in-patients-with-chronic-periodontitis
#4
M S Petrović, I Y Kannosh, J M Milašin, D S Mihailović, R R Obradović, S R Bubanj, L G Kesić
OBJECTIVE: A clinical prospective study was designed to evaluate microbiological, cytomorphometric and clinical efficacy of low-level laser therapy (LLLT) as an adjunct to periodontal therapy in the treatment of chronic periodontitis. METHODS: Sixty subjects were included and randomly assigned into 2 groups: SRP (scaling root planning) group (n = 30) and LLLT + SRP group (n = 30). Clinical parameters were measured before intervention, after the fifth treatment, and after a month...
January 12, 2018: International Journal of Dental Hygiene
https://www.readbyqxmd.com/read/29327088/amplification-of-pressure-waves-in-laser-assisted-endodontics-with-synchronized-delivery-of-er-yag-laser-pulses
#5
Nejc Lukač, Matija Jezeršek
When attempting to clean surfaces of dental root canals with laser-induced cavitation bubbles, the resulting cavitation oscillations are significantly prolonged due to friction on the cavity walls and other factors. Consequently, the collapses are less intense and the shock waves that are usually emitted following a bubble's collapse are diminished or not present at all. A new technique of synchronized laser-pulse delivery intended to enhance the emission of shock waves from collapsed bubbles in fluid-filled endodontic canals is reported...
January 11, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29325861/crystallographic-and-morphological-analysis-of-sandblasted-highly-translucent-dental-zirconia
#6
Masanao Inokoshi, Haruki Shimizu, Kosuke Nozaki, Tomohiro Takagaki, Kumiko Yoshihara, Noriyuki Nagaoka, Fei Zhang, Jozef Vleugels, Bart Van Meerbeek, Shunsuke Minakuchi
OBJECTIVE: To assess the influence of alumina sandblasting on four highly translucent dental zirconia grades. METHODS: Fully sintered zirconia disk-shaped specimens (15-mm diameter; 0.5-mm thickness) of four highly translucent yttria partially stabilized zirconia (Y-PSZ) grades (KATANA HT, KATANA STML, KATANA UTML, Kuraray Noritake; Zpex Smile, Tosoh) were sandblasted with 50-μm alumina (Al2O3) sand (Kulzer) or left 'as-sintered' (control) (n=5). For each zirconia grade, the translucency was measured using a colorimeter...
January 8, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29322655/efficiency-of-er-yag-laser-in-debonding-of-porcelain-laminate-veneers-by-contact-and-non-contact-laser-application-modes-in-vitro-study
#7
Mohand ALBalkhi, Eyad Swed, Omar Hamadah
OBJECTIVE: To determine the efficiency of debonding porcelain laminate veneers (PLV) by using several laser parameters and two different application modes of Er:YAG laser [contact (CM) and non-contact (NCM)], by verification of the consumed PLV debonding time and the changes in dental pulp temperature. MATERIALS AND METHODS: Forty extracted non-carious human maxillary premolars were prepared for receiving PLV. Sixteen of them were divided into two groups, each of them comprised eight samples based on the application mode; group A with NCM, and group B with CM...
January 11, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29308507/-analysis-and-prevention-of-dust-pollution-caused-by-5-common-prosthetic-materials
#8
Xiang-Wen Yang, Bin Wei, Cao-Yun Zhu, Liang Qian, Yi-Han Li
PURPOSE: To analyze and evaluate dust pollution in prosthodontic clinic and make proposal for reasonable protection. METHODS: This study analyzed the particle size, element composition and dust concentration of 5 materials which were commonly used in dental restorations (veneering ceramics, cobalt-chromium alloy, photosensitive plastic, hard base resin, advanced artificial teeth) by using scanning electron microscopy (SEM), X-ray energy dispersive spectrometer(EDS) and dust concentration laser tester, in order to assess the effects of prosthodontic dust posed on medical staff health and put forward reasonable suggestions for prevention and control of dust pollution...
October 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29304423/pulpal-blood-flow-recorded-from-exposed-dentine-with-a-laser-doppler-flow-meter-using-red-or-infrared-light
#9
Kanittha Kijsamanmith, Noppakun Vongsavan, Bruce Matthews
OBJECTIVE: To determine the percentage of the blood flow signal that is derived from dental pulp when recording from exposed dentine in a human premolar. DESIGN: Recordings were made from 7 healthy teeth in 5 subjects (aged 22-33 yr.) with a laser Doppler flow meter (Periflux 4001) using either a red (635 nm) or an infrared (780 nm) laser. After exposing dentine above the buccal pulpal horn (cavity diam. 1.6 mm, depth 3 mm) and isolating the crown with opaque rubber dam, blood flow was recorded alternately with infrared or red light from the exposed dentine under four conditions: before and after injecting local anaesthetic (3% Mepivacaine without vasoconstrictor) (LA) over the apex of the root of the tooth; after exposing the pulp by cutting a buccal, class V cavity in the tooth; and after sectioning the coronal pulp transversely through the exposure...
December 16, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29304422/bleaching-and-enamel-surface-interactions-resulting-from-the-use-of-highly-concentrated-bleaching-gels
#10
Guillermo Grazioli, Lisia Lorea Valente, Cristina Pereira Isolan, Helena Alves Pinheiro, Camila Gonçalves Duarte, Eliseu Aldrighi Münchow
Tooth bleaching is considered a non-invasive treatment, although the use of highly-concentrated products may provoke increased surface roughness and enamel demineralization, as well as postoperative sensitivity. Thus, the aim of this study was to investigate whether hydrogen peroxide (H2O2) concentration would affect tooth bleaching effectiveness and the enamel surface properties. Enamel/dentin bovine specimens (6 × 4 mm) were immersed in coffee solution for 7 days and evaluated with a spectrophotometer (Easyshade; baseline), using the CIEL*a*b* color parameters...
December 28, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29303758/response-of-soft-tissue-to-different-abutment-materials-with-different-surface-topographies-a-review-of-the-literature
#11
Feras Al Rezk, Georgia Trimpou, Hans-Christoph Lauer, Paul Weigl, Nadine Krockow
Soft tissue integration in the transmucosal zone of dental abutments supports the peri-implant tissues, improves esthetics, ensures soft tissue seal against microorganisms, and preserves crestal bone level. The aim of this literature review was to define the most favorable surface topography and macrodesign of the transmucosal zone of abutments to achieve optimal soft tissue seal. An electronic search of the PubMed/MEDLINE database was performed, seeking relevant English-language articles published between January 1, 2003, and October 11, 2014...
January 2018: General Dentistry
https://www.readbyqxmd.com/read/29298403/intrapulpal-temperature-increases-caused-by-445-nm-diode-laser-assisted-debonding-of-self-ligating-ceramic-brackets-during-simulated-pulpal-fluid-circulation
#12
Steffen Stein, Johannes Wenzler, Andreas Hellak, Michael Schauseil, Heike Korbmacher-Steiner, Andreas Braun
OBJECTIVE: This study investigated temperature increases in dental pulp resulting from laser-assisted debonding of ceramic brackets using a 445-nm diode laser. MATERIALS AND METHODS: Eighteen ceramic brackets were bonded in standardized manner to 18 caries-free human third molars. Pulpal fluid circulation was simulated by pumping distilled water at 37°C through the pulp chamber. The brackets were irradiated with a 445-nm diode laser. Temperatures were measured using a thermal camera at points P1 (center of the pulp) and P2 (in the hard dental tissue) at the baseline (T0), at the start and end of laser application (T1 and T2), and the maximum during the sequence (Tmax)...
January 3, 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29295701/evaluation-of-fibroblasts-cells-viability-and-adhesion-on-six-different-titanium-surfaces-an-in-vitro-experimental-study
#13
Sergio Alexandre Gehrke, Leticia Perez-Diaz, Berenice Anina Dedavid
BACKGROUND: The topographical surficial characteristics and properties of materials can induce different cell reactions regards to the viability and adhesion according to the recent patents. The aim of this in vitro experimental study was to evaluate the viability and adhesion of fibroblastic cells seeded on titanium disks with different surface topography. In addition, we revised all patents relating to sintering process titanium powder surface treatment for a of dental implants. METHODS: Fibroblast cells were cultured on 6 surfaces models: mA disks corresponding to titanium surfaces without additional treatment (machined surface) were compared with mB disks, where surfaces were sandblasting etching using aluminum oxide; mC disks where titanium oxide was used for sandblasting etching; mD disks where triple acid conditioning was used, mE disks with laser treated surface and mF disks which were made of titanium powder by a sintering process...
January 1, 2018: Recent Patents on Biotechnology
https://www.readbyqxmd.com/read/29284097/effectiveness-of-led-laser-irradiation-on-in-office-dental-bleaching-after-three-years
#14
Rfl Mondelli, Fap Rizzante, E R Rosa, Afs Borges, A Y Furuse, Jfs Bombonatti
The present in vivo randomized, triple-blinded, and split-mouth clinical study evaluated the effectiveness of a hybrid light (HL) source on the color change, stability, and tooth sensitivity in patients submitted to different in-office bleaching techniques. Twenty volunteers were divided into two groups and four subgroups. A split-mouth design was conducted to compare two in-office bleaching techniques (with and without light activation): 35% Lase Peroxide Sensy (LPS) + HL: 35% hydrogen peroxide (HP) + HL; 35% LPS: 35% HP; 25% LPS + HL: 25% HP + HL; and 35% Whiteness HP (WHP): 35% HP...
January 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29282849/laser-assisted-removal-of-all-ceramic-fixed-dental-prostheses-a-comprehensive-review
#15
REVIEW
Sergio Varela Kellesarian, Vanessa Ros Malignaggi, Khaled M Aldosary, Fawad Javed
OBJECTIVE: The aim of this comprehensive review was to assess the effectiveness of erbium lasers in the removal of all ceramic fixed dental prostheses (FDPs). OVERVIEW: Indexed databases were searched without language or time restriction up to and including December 2017 using different combinations of the following keywords: "lasers"; "phototherapy"; "crowns"; "prostheses and implants"; "inlays"; "ceramics"; "dental porcelain"; "zirconium"; "removal"; "debonding"; "fixed dental prostheses"; "veneers"; "laminates"; and "fixed bridge...
December 28, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29279546/application-of-fluoridated-hydroxyapatite-thin-film-coatings-using-krf-pulsed-laser-deposition
#16
Yoshiya Hashimoto, Mamoru Ueda, Yu Kohiga, Kazuki Imura, Shigeki Hontsu
Fluoridated hydroxyapatite (FHA) was investigated for application as an implant coating for titanium bone substitute materials in dental implants. A KrF pulsed excimer deposition technique was used for film preparation on a titanium plate. The compacts were ablated by laser irradiation at an energy density of 1 J/cm2 on an area 1×1 mm2 with the substrate at room temparature. Energydispersive spectrometric analysis of the FHA film revealed peaks of fluorine in addition to calcium and phosphorus. X-ray diffraction revealed the presence of crystalline FHA on the FHA film after a 10 h post annealing treatment at 450°C...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29276777/patient-centered-dentinal-hypersensitivity-treatment-outcomes-results-from-the-national-dental-pbrn
#17
M W Heft, M S Litaker, D T Kopycka-Kedzierawski, C Meyerowitz, S Chonowski, R L Yardic, V V Gordan, R Mungia, G H Gilbert
Dentinal hypersensitivity (DH) can have a significant impact on oral health and functioning, and it is a clinical symptom commonly managed by dentists during routine clinical practice. DH symptoms are typically elicited by otherwise innocuous, nonpainful stimuli applied to exposed dentin (e.g., tactile stimuli, warming or cooling temperatures or air puffs). Treatment approaches have sought to directly target the dentinal pulp tissues or close dentinal tubules via dental office care and treatment services (fluoride varnishes, glutaraldehydes, bonding agents, sealants, oxalates, or lasers) or home care services (toothpastes or dentifrices containing fluoride or potassium nitrate compounds)...
January 2018: JDR Clinical and Translational Research
https://www.readbyqxmd.com/read/29275852/required-time-for-migration-of-bone-marrow-derived-cells-to-dental-pulp-after-bone-marrow-transplantation
#18
Marcos Frozoni, Marcelo Rocha Marques, Rovilson Gilioli, Luiz Felipe Silva, Adriana de Jesus Soares, Alexandre Augusto Zaia
INTRODUCTION: This study aimed to evaluate the time required for bone marrow-derived cells (BMDCs) from transgenic green fluorescent protein (GFP)+ donor mice (GFP+ mice) to migrate into the dental pulp of wild-type GFP- recipient mice (GFP- mice) by using bone marrow transplantation (BMT) as an in vivo model for tracking BMDCs from GFP+ mice (GFP+ BMDCs). METHODS: GFP+ BMDCs were injected into irradiated GFP- mice. Maxillary arches, tibiae, and femora from GFP- mice were isolated and processed at 24 hours, 48 hours, 4, 7, and 14 days, and 7 weeks after BMT...
December 21, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29250712/photostimulation-of-osteogenic-differentiation-on-silk-scaffolds-by-plasma-arc-light-source
#19
Anıl Sera Çakmak, Soner Çakmak, H Seda Vatansever, Menemşe Gümüşderelioğlu
Low-level laser therapy (LLLT) has been used for more than 30 years to heal wounds. In recent years, LLLT or photostimulation has been indicated as an effective tool for regenerative and dental medicine by using monochromatic light. The aim of this study is to indicate the usability of plasma arc light source for bone regeneration. This is why we used polychromatic light source providing effective wavelengths in the range of 590-1500 nm for cellular response and investigated photostimulation effects on osteogenic differentiation of human mesenchymal stem cells (hMSCs) seeded on 3D silk scaffolds...
December 18, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29248941/evaluation-of-an-experimental-remineralizing-agent-for-repairing-enamel-surfaces
#20
Margarita V Úsuga Vacca, Carolina Torres-Rodríguez, Edgar Delgado-Mejía
The best material for repairing enamel surface defects is one very similar to the original enamel and which interacts with natural remineralization mechanisms. It does not repair extensive damage, so in order to fill large defects, external help is required using phosphocalcic ceramic composites that activate salivary remineralization efficiently though on smaller in scale. Effective adhesion of the repair may depend on the amount of aqueous fluids present in the enamel, which apparently enable nucleation and growth of new minerals to ensure adhesion and stability...
August 2017: Acta Odontológica Latinoamericana: AOL
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