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https://www.readbyqxmd.com/read/28444011/prototype-to-measure-bracket-debonding-force-in-vivo
#1
Jéssika Lagni Tonus, Fernanda Borguetti Manfroi, Gilberto Antonio Borges, Eduardo Correa Grigolo, Sérgio Helegda, Ana Maria Spohr
INTRODUCTION: Material biodegradation that occurs in the mouth may interfere in the bonding strength between the bracket and the enamel, causing lower bond strength values in vivo, in comparison with in vitro studies. OBJECTIVE: To develop a prototype to measure bracket debonding force in vivo and to evaluate, in vitro, the bond strength obtained with the prototype. METHODS: A original plier (3M Unitek) was modified by adding one strain gauge directly connected to its claw...
February 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/28435620/the-effect-of-resin-cement-type-and-cleaning-method-on-the-shear-bond-strength-of-resin-cements-for-recementing-restorations
#2
Roodabeh Koodaryan, Ali Hafezeqoran, Amin Khakpour Maleki
PURPOSE: This laboratory study assessed the effect of different dentin cleaning procedures on shear bond strength of resin cements for recementing prosthesis. MATERIALS AND METHODS: 4 × 4 flat surface was prepared on the labial surface of 52 maxillary central incisors. Metal frames (4 × 4 × 1.5 mm) were cast with nickel-chromium alloy. All specimens were randomly divided into 2 groups to be cemented with either Panavia F2.0 (P) or RelyX Ultimate (U) cement. The initial shear bond strength was recorded by Universal Testing Machine at a crosshead speed of 0...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28429029/derivatization-and-interlaminar-debonding-of-graphite-iron-nanoparticle-hybrid-interfaces-using-fenton-chemistry
#3
Neha Agarwal, Ruma Bhattacharyya, Narendra K Tripathi, Sanjay Kanojia, Debmalya Roy, Kingsuk Mukhopadhyay, Namburi Eswara Prasad
The interfacial debonding of graphite lattices using iron (Fe) nanoparticles and Fenton's reagent is reported, towards the scalable production of few-layer graphene flakes. Acoustic cavitation via a sonochemical route was adapted to produce iron and iron oxide nanoparticles in the graphite matrix. The oxygenated species were introduced into the graphite lattice using a physical method, and then Fenton chemistry was utilized to generate localized hydroxyl radicals at the Fe nanoparticle-graphite interfaces for zipping and self-exfoliation of the defected graphite lattices...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28422602/does-bonding-approach-influence-the-bond-strength-of-universal-adhesive-to-dentin-of-primary-teeth
#4
Tathiane Larissa Lenzi, Fabio Zovico Maxnuck Soares, Rachel de Oliveira Rocha
OBJECTIVE: To evaluate the effect of bonding strategy on microtensile bond strength (μTBS) of a new universal adhesive system to primary tooth dentin. STUDY DESIGN: Flat dentin surfaces from 25 primary molars were assigned to 5 groups according to the adhesive and bonding approach: Adper Single Bond 2 (two-step etch-and-rinse adhesive) and Clearfil SE Bond (two-step self-etch system), as controls; Scotchbond Universal Adhesive-self-etch, dry or wet-bonding etch-and-rinse strategies...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28422367/microtensile-bond-strength-of-a-resin-cement-to-silica-based-and-y-tzp-ceramics-using-different-surface-treatments
#5
Alireza Keshvad, Seyed Mohammad Reza Hakimaneh
PURPOSE: To evaluate the effects of different surface treatments on the microtensile bond strength (μTBS) of bonding between resin cement and lithia or zirconia-based ceramics using an in vitro study. MATERIALS AND METHODS: Three zirconia ceramic blocks (IPS e.max ZirCAD) and three lithium disilicate ceramic blocks (IPS e.max CAD) were sintered and duplicated in resin composite. The zirconia specimens underwent various treatments (n = 1): (i) Sandblast + primer (ZiSa); (ii) sandblast + laser irradiation + primer (ZiSaLa); or (iii) laser irradiation + primer (ZiLa)...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28422359/clinical-evaluation-of-indirect-particle-filled-composite-resin-cad-cam-partial-crowns-after-24-months
#6
Moritz Zimmermann, Christina Koller, Marcel Reymus, Albert Mehl, Reinhard Hickel
PURPOSE: Resin-based CAD/CAM compound materials might be promising for single-tooth restorations. Insufficient clinical data are available for this new material class. The purpose of this study was to describe initial clinical in vivo results for indirect particle-filled composite resin CAD/CAM restorations after 24 months. MATERIALS AND METHODS: Indirect particle-filled composite resin restorations were fabricated with a CAD/CAM method (CEREC Bluecam intraoral scanner, CEREC MCXL milling unit) by calibrated dental students...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28420831/enamel-microcracks-in-terms-of-orthodontic-treatment-a-novel-method-for-their-detection-and-evaluation
#7
Irma Dumbryte, Laura Linkeviciene, Tomas Linkevicius, Mangirdas Malinauskas
The study aimed at introducing current available techniques for enamel microcracks (EMCs) detection, and presenting a method for direct quantitative analysis of an individual EMC. Measurements of the detailed EMCs characteristics (location, length, and width) were taken from the reconstructed images of the buccal tooth surface (teeth extracted from two age groups of patients) employing a scanning electron microscopy (SEM) and our derived formulas before and after ceramic brackets removal. Measured parameters of EMCs for younger age group were 2...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28416096/treatment-outcomes-of-archwise-distraction-osteogenesis-in-mandibular-dentoalveolar-retrognathia-cases
#8
C Yöndem, Y B Acar, B C Şener, A N Erverdi
The aim of this study was to describe the treatment of class II malocclusion by sagittal advancement of the alveolar bone in the symphyseal area using an intraoral archwise distractor device and to determine the effects of this method on the dentoalveolar complex. Fifteen patients (10 female, five male) aged 16-20 years with a class II division 2 malocclusion, characterized by mandibular dentoalveolar retrusion and a prominent chin, underwent archwise alveolar distraction in the anterior mandible. Lateral cephalometric radiographs were obtained before distraction (T0), after 6 weeks of consolidation (T1), and after debonding (T2)...
April 13, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28403329/longevity-of-metal-ceramic-crowns-cemented-with-self-adhesive-resin-cement-a-prospective-clinical-study
#9
Lucas Pradebon Brondani, Tatiana Pereira-Cenci, Vinicius Felipe Wandsher, Gabriel Kalil Pereira, Luis Felipe Valandro, César Dalmolin Bergoli
Resin cements are often used for single crown cementation due to their physical properties. Self-adhesive resin cements gained widespread due to their simplified technique compared to regular resin cement. However, there is lacking clinical evidence about the long-term behavior of this material. The aim of this prospective clinical trial was to assess the survival rates of metal-ceramic crowns cemented with self-adhesive resin cement up to six years. One hundred and twenty-nine subjects received 152 metal-ceramic crowns...
April 10, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28400596/the-effect-of-the-teeth-bleaching-with-35-hydrogen-peroxide-on-the-tensile-bond-strength-of-metal-brackets
#10
Giedre Trakiniene, Simona Daukontiene, Vytautas Jurenas, Vilma Svalkauskiene, Dalia Smailiene, Kristina Lopatiene, Tomas Trakinis
The objective of this study was to determine the effects of teeth bleaching on the tensile bond strength of metal brackets bonded with light-curing adhesive system to the human enamel. 40 recently extracted human permanent molars were used for the study. The mesial buccal surface of each tooth was used as a control group and the distal buccal surface was used as an experimental group. Control group surfaces were not submitted to bleaching, while experimental group surfaces were bleached with in-office bleaching material containing 35% hydrogen peroxide...
April 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28386547/biomechanical-evaluation-of-a-tooth-restored-with-high-performance-polymer-pekk-post-core-system-a-3d-finite-element-analysis
#11
Ki-Sun Lee, Joo-Hee Shin, Jong-Eun Kim, Jee-Hwan Kim, Won-Chang Lee, Sang-Wan Shin, Jeong-Yol Lee
The aim of this study was to evaluate the biomechanical behavior and long-term safety of high performance polymer PEKK as an intraradicular dental post-core material through comparative finite element analysis (FEA) with other conventional post-core materials. A 3D FEA model of a maxillary central incisor was constructed. A cyclic loading force of 50 N was applied at an angle of 45° to the longitudinal axis of the tooth at the palatal surface of the crown. For comparison with traditionally used post-core materials, three materials (gold, fiberglass, and PEKK) were simulated to determine their post-core properties...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28386279/effect-of-rebonding-on-the-bond-strength-of-orthodontic-tubes-a-comparison-of-light-cure-adhesive-and-resin-modified-glass-ionomer-cement-in-vitro
#12
Monika Aleksiejunaite, Antanas Sidlauskas, Arunas Vasiliauskas
The purpose of this study was to determine the impact of different enamel preparation procedures and compare light cure composite (LCC) and resin-modified glass ionomer (RMGI) on the bond strength of orthodontic metal tubes rebonded to the enamel. Twenty human molars were divided into two groups (n = 10). Tubes were bonded using LCC (Transbond XT) in group 1 and RMGI (Fuji Ortho LC) in group 2. The tubes in each group were bonded following manufacturers' instructions (experiment I) and then debonded using testing machine...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28376622/mechanical-loading-influences-the-viscoelastic-performance-of-the-resin-carious-dentin-complex
#13
Manuel Toledano, Raquel Osorio, Modesto T López-López, Fátima S Aguilera, Franklin García-Godoy, Manuel Toledano-Osorio, Estrella Osorio
The aim of this study was to evaluate the changes in the mechanical behavior and bonding capability of Zn-doped resin-infiltrated caries-affected dentin interfaces. Dentin surfaces were treated with 37% phosphoric acid (PA) followed by application of a dentin adhesive, single bond (SB) (PA+SB) or by 0.5 M ethylenediaminetetraacetic acid (EDTA) followed by SB (EDTA+SB). ZnO microparticles of 10 wt. % or 2 wt. % ZnCl2 was added into SB, resulting in the following groups: PA+SB, PA+SB-ZnO, PA+SB-ZnCl2, EDTA+SB, EDTA+SB-ZnO, EDTA+SB-ZnCl2...
April 4, 2017: Biointerphases
https://www.readbyqxmd.com/read/28375683/can-we-improve-the-laser-etching-with-the-digitally-controlled-laser-handpiece-xrunner
#14
Hilal Yilanci, Serdar Usumez, Aslihan Usumez
OBJECTIVE: The aim of this study was to compare the shear bond strength (SBS), enamel surface characteristics, and the adhesive remnant index (ARI) scores of different etching methods. BACKGROUND DATA: Laser etching changes the physical characteristics of the enamel surface and these alterations hold promise for the conditioning of enamel for bonding procedures. A new Er:YAG laser handpiece is unique in its ability to digitally control size, shape, and depth of irradiated enamel area...
April 5, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28327695/do-repeated-changes-of-abutments-have-any-influence-on-the-stability-of-peri-implant-tissues-one-year-post-loading-results-from-a-multicentre-randomised-controlled-trial
#15
Marco Esposito, Eriberto Bressan, Maria Gabriella Grusovin, Ferdinando D'Avenia, Konrad Neumann, Luca Sbricoli, Giuseppe Luongo
PURPOSE: To evaluate the influence of at least three abutment changes in conventionally loaded implants against placement of a definitive abutment in immediately non-occlusal loaded implants on hard and soft tissue changes. MATERIALS AND METHODS: Eighty patients requiring one single crown or one fixed partial prosthesis supported by a maximum of three implants were randomised, after implants were placed with more than 35 Ncm, according to a parallel group design to receive definitive abutments which were loaded immediately (definitive abutment or immediate loading group) or transmucosal abutments...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28322343/unprecedented-simultaneous-enhancement-in-damage-tolerance-and-fatigue-resistance-of-zirconia-ta-composites
#16
A Smirnov, J I Beltrán, T Rodriguez-Suarez, C Pecharromán, M C Muñoz, J S Moya, J F Bartolomé
Dense (>98 th%) and homogeneous ceramic/metal composites were obtained by spark plasma sintering (SPS) using ZrO2 and lamellar metallic powders of tantalum or niobium (20 vol.%) as starting materials. The present study has demonstrated the unique and unpredicted simultaneous enhancement in toughness and strength with very high flaw tolerance of zirconia/Ta composites. In addition to their excellent static mechanical properties, these composites also have exceptional resistance to fatigue loading. It has been shown that the major contributions to toughening are the resulting crack bridging and plastic deformation of the metallic particles, together with crack deflection and interfacial debonding, which is compatible with the coexistence in the composite of both, strong and weak ceramic/metal interfaces, in agreement with predictions of ab-initio calculations...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28300497/bond-strength-of-stainless-steel-orthodontic-brackets-bonded-to-prefabricated-acrylic-teeth
#17
Wan Salbiah Wan Abdul Razak, Martyn Sherriff, Dirk Bister, Jadbinder Seehra
OBJECTIVES: The purpose of this in-vitro study was to evaluate the force to debond stainless steel orthodontic brackets bonded to acrylic teeth using different combinations of adhesive and surface treatments. MATERIALS AND METHODS: One hundred prefabricated upper lateral incisor acrylic teeth were divided into 4 equal groups: Transbond XT® adhesive only (Group 1, control), Transbond XT® adhesive with sandblasting (Group 2), Transbond XT® adhesive with abrasion / + methyl methacrylate (MMA) (Group 3) and Triad® Gel only (Group 4)...
March 16, 2017: Journal of Orthodontics
https://www.readbyqxmd.com/read/28298988/bond-strength-of-dental-nanocomposites-repaired-with-a-bulkfill-composite
#18
Uzay Koç-Vural, Leyla Kerimova, İsmail H Baltacioglu, Arlin Kiremitçi
BACKGROUND: The aim of this study was to analyze the bond strength of aged resin based nanocomposites repaired with the same and bulk fill composites. MATERIAL AND METHODS: Seventy-two disc shaped resin composites consisted of three different nanocomposite resins (Filtek Ultimate/FU, Herculite XRV Ultra/HXRV, and Reflectys/R) were produced. After storing the samples for 8 weeks in distilled water, each material was combined with the same material or the bulk-fill composite resin system (Filtek Ultimate+Filtek Ultimate/Group-1; Filtek Ultimate+Tetric BF/Group-2; Herculite XRV+Herculite XRV/Group-3; Herculite XRV+Tetric BF/ Group-4; Reflectys+Reflectys/Group 5; Reflectys+Tetric BF/Group-6), for repair...
March 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28293665/comparison-of-endodontic-medicaments-on-bond-strength-of-fiber-post-to-root-dentin-using-resin-cement
#19
Maryam Zare Jahromi, Mehrdad Barekatain, Shirin Ravanbod, Parisa Ranjbarian, Sara Kousehlar
STATEMENT OF THE PROBLEM: Endodontic irrigants and medicaments may affect the bond strength of intracanal posts to root dentin. PURPOSE: The aim of this study was to compare the effect of calcium hydroxide (Ca(OH)2) and 2% chlorhexidine gel (CHX) on bond strength of fiber post cemented with resin cement to root dentin. MATERIALS AND METHOD: This in vitro experimental study was conducted on 36 mandibular premolars. Canals were prepared using the step back technique...
March 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28289759/thermal-imaging-of-the-pulp-during-residual-adhesive-removal
#20
Gökmen Kurt, Nisa Gül, Özgür Er, Gülşen Çakmak, Emre Bendeş, Veysel Aslantaş
OBJECTIVE: The aim of this study was to evaluate the temperature changes of the pulpal area during different adhesive clean-up procedures. MATERIALS AND METHODS: A total of 80 freshly extracted adult maxillary premolar teeth were divided into four groups. Adhesive clean-up was performed with 6- and 12-fluted tungsten carbide burs (TCB) using low- and high-speed handpieces with air or water cooling after bracket debonding. The temperature changes and cool down times were evaluated with a thermal camera...
March 13, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
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