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https://www.readbyqxmd.com/read/27894527/accuracy-and-mechanical-properties-of%C3%A2-orthodontic-models-printed-3-dimensionally-from-calcium-sulfate-before-and-after-various-postprinting-treatments
#1
Austin D Ledingham, Jeryl D English, Sercan Akyalcin, Benjamin E Cozad, Joe C Ontiveros, F Kurtis Kasper
INTRODUCTION: Dental models fabricated with 3-dimensional printing technologies are revolutionizing the practice of orthodontics, but they generally comprise polymeric materials that may not be suitable for certain applications, such as soldering appliances. The objective of this study was to investigate the dimensional accuracy and mechanical properties of 3-dimensional printed ceramic-based models before and after various treatments intended to improve their mechanical properties. METHODS: Thirty identical models were printed 3-dimensionally from a calcium sulfate-based substrate and divided into 3 groups for treatment: high heat (250°C for 30 minutes), low heat (150°C for 30 minutes), and Epsom salt treatment...
December 2016: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/27878896/bonding-performance-of-universal-adhesives-to-er-cr-ysgg-laser-irradiated-enamel
#2
Muhammet Kerim Ayar, Fatih Erdemir
Universal adhesives have been recently introduced for use as self-etch or etch-and-rinse adhesives depending on the dental substrate and clinical condition. However, their bonding effectiveness to laser-irradiated enamel is still not well-known. Thus, the aim of this study was to compare the shear bond strength (SBS) of universal adhesives (Single Bond Universal; Nova Compo-B Plus) applied to Er,Cr:YSGG laser-irradiated enamel with SBS of the same adhesives applied in self-etch and acid-etching modes, respectively...
November 23, 2016: Microscopy Research and Technique
https://www.readbyqxmd.com/read/27872333/three-dimensional-analysis-of-enamel-crack-behavior-using-optical-coherence-tomography
#3
M S Segarra, Y Shimada, A Sadr, Y Sumi, J Tagami
The aim of this study was to nondestructively analyze enamel crack behavior on different areas of teeth using 3D swept source-optical coherence tomography (SS-OCT). Ten freshly extracted human teeth of each type on each arch (n = 80 teeth) were inspected for enamel crack patterns on functional, contact and nonfunctional, or noncontact areas using 3D SS-OCT. The predominant crack pattern for each location on each specimen was noted and analyzed. The OCT observations were validated by direct observations of sectioned specimens under confocal laser scanning microscopy (CLSM)...
November 21, 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/27856377/assessment-of-the-efficiency-of-erbium-yag-laser-as-an-assistant-method-to-rapid-maxillary-expansion-an-in-vivo-study
#4
Shadi George Moawad, Joseph Bouserhal, Mohammad Kusai Al-Munajed
INTRODUCTION: Maxillary transverse deficiency (MTD) is one of the most pervasive and common skeletal problems in the craniofacial complex. This study aimed to evaluate the effect of associating the application of Erbium-YAG laser with rapid maxillary expansion (RME) for treating MTD in young adult patients with permanent dentition in regard to skeletal and dental effects. METHODS: Twenty-four subjects, aged from 15.5 to 19 years and needing RME as a therapeutic procedure, were randomly assigned to either the laser group (n=12) or the control group (n=12)...
November 14, 2016: International Orthodontics
https://www.readbyqxmd.com/read/27853345/comparative-evaluation-of-microhardness-and-morphology-of-permanent-tooth-enamel-surface-after-laser-irradiation-and-fluoride-treatment-an-in-vitro-study
#5
Puneet Kumar, Mridula Goswami, Jatinder Kaur Dhillon, Ferah Rehman, Deepti Thakkar, Kusum Bharti
Background and aims: The aim of the study was to evaluate and compare the surface microhardness and surface morphology of permanent tooth enamel after Er,Cr:YSGG laser irradiation and Fluoride application. Materials and methods: One hundred and twenty premolars extracted for orthodontic purpose were used in the study and randomly divided into 6 groups. Group A was not subjected to any treatment. Group B was subjected to Er,Cr:YSGG laser irradiation. Group C was subjected to Er,Cr:YSGG laser irradiation followed by application of 2% NaF gel for 4 minutes...
October 1, 2016: Laser Therapy
https://www.readbyqxmd.com/read/27853108/efficacy-and-safety-of-a-therapeutic-apparatus-using-hydrogen-peroxide-photolysis-to-treat-dental-and-periodontal-infectious-diseases
#6
Hirohisa Sato, Yoshimi Niwano, Keisuke Nakamura, Takayuki Mokudai, Hiroyo Ikai, Taro Kanno, Hiroshi Egusa
The present study aimed to evaluate the acute locally injurious property of our most current hydroxyl radical generation system by hydrogen peroxide (H2O2) photolysis. This system, which releases 3% H2O2 with a 405-nm laser, was developed in our laboratory for the treatment of dental and periodontal infectious diseases. First, the hydroxyl radical yield generated by H2O2 photolysis was examined by applying an electron spin resonance-spin trapping technique. Second, the bactericidal effect of the device was examined under a simulant condition in which Streptococcus mutans, a pathogenic bacterial species that causes caries, was irrigated with running 3% H2O2 concomitantly with laser irradiation...
2016: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/27833792/effects-of-co2-laser-irradiation-on-matrix-rich-biofilm-development-formation-an-in-vitro-study
#7
Bruna Raquel Zancopé, Vanessa B Dainezi, Marinês Nobre-Dos-Santos, Sillas Duarte, Vanessa Pardi, Ramiro M Murata
BACKGROUND: A carbon dioxide (CO2) laser has been used to morphologically and chemically modify the dental enamel surface as well as to make it more resistant to demineralization. Despite a variety of experiments demonstrating the inhibitory effect of a CO2 laser in reduce enamel demineralization, little is known about the effect of surface irradiated on bacterial growth. Thus, this in vitro study was preformed to evaluate the biofilm formation on enamel previously irradiated with a CO2 laser (λ = 10...
2016: PeerJ
https://www.readbyqxmd.com/read/27825561/clasp-fabrication-using-one-process-molding-by-repeated-laser-sintering-and-high-speed-milling
#8
Toyoki Nakata, Hidemasa Shimpo, Chikahiro Ohkubo
PURPOSE: A single machine platform that integrates repeated laser sintering and high-speed milling for one-process molding has been developed. METHODS: The Akers clasp was designed using the CAD system (DWOS Partial Frameworks, Dental Wings) and fabricated using repeated laser sintering and a high-speed milling machine (LUMEX Advance-25, Matsuura) with 50-μm Co-Cr particles (CAM clasp). As controls, cast clasps of the same forms were also prepared using conventional casting methods with a Co-Cr alloy and CP titanium Grade 3...
November 4, 2016: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/27809872/pen-type-laser-fluorescence-device-versus-bitewing-radiographs-for-caries-detection-on-approximal-surfaces
#9
M Bizhang, N Wollenweber, P Singh-Hüsgen, G Danesh, S Zimmer
BACKGROUND: The accurate detection of approximal caries is generally difficult. The aim of this study was to assess the ability of the pen-type laser fluorescence device (LF pen) to detect approximal carious lesions in comparison to bitewing radiographs (BW). METHODS: Three hundred forty-one tooth surfaces were diagnosed in 20 patients with an average age of 26.70 (±2.82) years. Each test tooth was sequentially assessed by a single calibrated examiner using visual inspection, BW, and the LF pen...
November 4, 2016: Head & Face Medicine
https://www.readbyqxmd.com/read/27800592/stress-and-displacement-pattern-evaluation-using-two-different-palatal-expanders-in-unilateral-cleft-lip-and-palate-a-three-dimensional-finite-element-analysis
#10
Anoop Mathew, K S Nagachandran, Devaki Vijayalakshmi
BACKGROUND: In this finite element (FE) study, the stress distribution and displacement pattern was evaluated in the mid-palatal area and around circum-maxillary sutures exerted by bone-borne palatal expander (BBPE) in comparison with conventional HYRAX rapid palatal expander in unilateral cleft lip and palate. METHODS: Computed tomography scan images of a patient with unilateral cleft palate was used to create a FE model of the maxillary bone along with circum-maxillary sutures...
December 2016: Progress in Orthodontics
https://www.readbyqxmd.com/read/27794148/450-nm-blue-laser-and-oral-surgery-preliminary-ex-vivo-study
#11
Carlo Fornaini, Elisabetta Merigo, Jean-Paul Rocca, Giuseppe Lagori, Hélène Raybaud, Stefano Selleri, Annamaria Cucinotta
INTRODUCTION: Dental diode lasers were started to be used at the end of the 1990s and were shown to possess several important characteristics, such as small size and low cost, as well as the advantage of optic fibers delivering system. Although only two wavelengths (810 and 980 nm) had been the most used dental diode lasers, a wavelength emitting in the blue portion of the spectrum has recently been proposed. AIM: The aim of this ex vivo study was to compare the effectiveness of five different fiber-delivered laser wavelengths (450, 532, 808, 1064, and 1340 nm) in the oral soft tissue ablation...
October 1, 2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27792279/laser-fluorescence-of-caries-detection-in-permanent-teeth-in-vitro-a-systematic-review-and-meta-analysis
#12
Maria Inês Rosa, Vilson Sampaio Schambeck, Eduardo Ronconi Dondossola, Maria Cecília Manenti Alexandre, Lisiane Tuon, Antonio Jose Grande, Fernando Hugo
BACKGROUND/OBJECTIVES: The detection of dental caries in the early stages, particularly on the occlusal surfaces, has become a mainstay of contemporary clinical practice. The objective of the study was to verify the accuracy of laser fluorescence (LF) for caries detection. METHODS: A comprehensive search of the MEDLINE (PubMed), EMBase, Cochrane Central Register of Controlled Trials, IBECS, BIOSIS, Web of Science, SCOPUS, Congress Abstracts and Grey literature databases was undertaken from 1980 through January 2016...
September 12, 2016: Journal of Evidence-based Medicine
https://www.readbyqxmd.com/read/27788123/osseointegration-of-three-dimensional-designed-titanium-implants-manufactured-by-selective-laser-melting
#13
Algabri Shaoki, Jia-Yun Xu, Haipeng Sun, Xian-Shuai Chen, Jianglin Ouyang, Xiu-Mei Zhuang, Fei-Long Deng
The selective laser melting (SLM) technique is a recent additive manufacturing (AM) technique. Several studies have reported success in the SLM-based production of biocompatible orthopaedic implants and three-dimensional bone defect constructs. In this study, we evaluated the surface properties and biocompatibility of an SLM titanium implant in vitro and compared them with those of a machined (MA) titanium control surface. In addition, we evaluated the osseointegration capability of the SLM implants in vivo and compared it with those of MA and Nobel-speedy (Nobel-S) implants...
October 27, 2016: Biofabrication
https://www.readbyqxmd.com/read/27785631/odontogenic-differentiation-and-biomineralization-potential-of-dental-pulp-stem-cells-inside-mg-based-bioceramic-scaffolds-under-low-level-laser-treatment
#14
Anna Theocharidou, Athina Bakopoulou, Eleana Kontonasaki, Eleni Papachristou, Christina Hadjichristou, Maria Bousnaki, George Theodorou, Lambrini Papadopoulou, Nikolaos Kantiranis, Konstantinos Paraskevopoulos, Petros Koidis
This study aimed to investigate the potential of low-level laser irradiation (LLLI) to promote odontogenic differentiation and biomineralization by dental pulp stem cells (DPSCs) seeded inside bioceramic scaffolds. Mg-based, Zn-doped bioceramic scaffolds, synthesized by the sol-gel technique, were spotted with DPSCs and exposed to LLLI at 660 nm with maximum output power of 140 mw at fluencies (a) 2 and 4 J/cm(2) to evaluate cell viability/proliferation by the MTT assay and (b) 4 J/cm(2) to evaluate cell differentiation, using real-time PCR (expression of odontogenic markers) and a p-nitrophenylphosphate (pNPP)-based assay for alkaline phosphatase (ALP) activity measurement...
October 26, 2016: Lasers in Medical Science
https://www.readbyqxmd.com/read/27778135/effect-of-adhesive-system-application-for-cavities-prepared-with-erbium-chromium-yttrium-scandium-gallium-garnet-laser-on-rat-dental-pulp-tissue
#15
Mayo Takada, Masaya Suzuki, Maiko Haga-Tsujimura, Koichi Shinkai
We examined the effects of adhesive systems under study applied for a laser-cut cavity using an Er,Cr:YSGG laser on rat dental pulp at 24 h and 14 days postoperatively. Group 1, laser-cut cavities were treated with a self-etching-primer and bonding agent; group 2, pretreated with a phosphoric-acid, and then treated with a self-etching-primer and bonding agent; group 3, pretreated with a phosphoric-acid and sodium-hypochlorite, and then treated with a self-etching-primer and bonding agent; and group 4, treated with an all-in-one adhesive...
October 24, 2016: Odontology
https://www.readbyqxmd.com/read/27762637/dextranase-from-arthrobacter-oxydans-kq11-1-inhibits-biofilm-formation-by-polysaccharide-hydrolysis
#16
Xiaobei Wang, Huaixu Cheng, Mingsheng Lu, Yaowei Fang, Yuliang Jiao, Weijuan Li, Gengmao Zhao, Shujun Wang
Dental plaque is a biofilm of water-soluble and water-insoluble polysaccharides, produced primarily by Streptococcus mutans. Dextranase can inhibit biofilm formation. Here, a dextranase gene from the marine microorganism Arthrobacter oxydans KQ11-1 is described, and cloned and expressed using E. coli DH5α competent cells. The recombinant enzyme was then purified and its properties were characterized. The optimal temperature and pH were determined to be 60°C and 6.5, respectively. High-performance liquid chromatography data show that the final hydrolysis products were glucose, maltose, maltotriose, and maltotetraose...
November 2016: Biofouling
https://www.readbyqxmd.com/read/27762606/geometric-morphometric-analysis-of-the-palatal-morphology-in-children-with-impacted-incisors-a-three-dimensional-evaluation
#17
Chiara Pavoni, Valeria Paoloni, Luis Tomas Huanca Ghislanzoni, Giuseppina Laganà, Paola Cozza
OBJECTIVE: To analyze variations in palatal morphology in subjects presenting unilaterally impacted maxillary permanent central incisors compared with a control group of subjects without eruption anomalies using a three-dimensional (3D) analysis. MATERIALS AND METHODS: Twenty-six white subjects (10 girls and 16 boys; mean age 9.5 ± 1.5 years) with unilaterally impacted maxillary permanent central incisors (impacted incisor group [IIG]) were compared with a control group (CG) of 26 subjects (14 girls and 12 boys, mean age 8...
October 20, 2016: Angle Orthodontist
https://www.readbyqxmd.com/read/27760008/in-vitro-study-of-temperature-changes-in-pulp-chamber-during-root-planing-procedure-using-er-yag-laser
#18
Blagovesta K Yaneva, Plamen I Zagorchev, Elena I Firkova, Ivan T Glavinkov
AIM: To assess temperature changes at specified time intervals during Er:YAG laser scaling and root planing of surfaces with dental calculus. MATERIALS AND METHODS: Fifteen single-rooted teeth with advanced periodontal disease were extracted and fixed in a cylinder thermostat filled with distilled water at constant temperature (35.5°C). A specially designed thermal probe (type K thermocouple) accurate to ±0.1°C over the range from 20°C to 80°C was fitted into the pulp chamber of tooth sample...
September 1, 2016: Folia Medica
https://www.readbyqxmd.com/read/27755417/diode-laser-clinical-efficacy-and-mini-invasivity-in-surgical-exposure-of-impacted-teeth
#19
Mario Migliario, Manuela Rizzi, Alberta Greco Lucchina, Filippo Renò
The gold standard to arrange impacted teeth in the dental arch is represented by a surgical approach followed by orthodontic traction force application. In the literature, many surgical approaches are proposed to reach such a scope. The aim of the present study is to demonstrate how laser technique could positively assist surgical approaches.Study population was composed by 16 patients undergoing orthodontic treatment of 20 impacted teeth. In 10 patients (population A) surgical exposure of the impacted teeth was performed using a 980 nm diode laser, while in the other 10 patients (population B), surgical incision was performed using a traditional lancet...
October 14, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27745774/a-parametric-study-of-laser-interference-surface-patterning-of-dental-zirconia-effects-of-laser-parameters-on-topography-and-surface-quality
#20
Erica Roitero, Federico Lasserre, Marc Anglada, Frank Mücklich, Emilio Jiménez-Piqué
OBJECTIVE: The aim of this work is to generate micrometric linear patterns with different topography on dental grade zirconia by means of UV laser interference and to assess the quality of the produced surface, both in term of the geometry produced and of the surface damage induced in the material. METHODS: The third harmonic of a Q-switched Nd:YAG laser (355nm, pulse duration of 10ns and repetition rate of 1Hz) was employed to pattern the surface of 3Y-TZP with micrometric-spaced lines...
October 10, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
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