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https://read.qxmd.com/read/30842795/effect-of-cyclic-loading-on-shear-bond-strength-of-orthodontic-brackets-an-in-vitro-study
#1
Mohammad Moslem Imani, Farzaneh Aghajani, Nafiseh Momeni, Mohammad Sadegh Ahmad Akhoundi
Objectives: In clinical conditions, orthodontic brackets are exposed to periodic stresses mainly induced by mastication and intraoral forces. The objective of the present study was to evaluate the effects of cyclic loading to simulate masticatory forces on shear bond strength (SBS) of metal brackets bonded to teeth using self-etch and total-etch bonding systems. Materials and Methods: Eighty-four caries- and crack-free bovine mandibular incisors were selected and randomly assigned to two groups based on the type of bonding system...
November 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://read.qxmd.com/read/30826042/biomechanical-analysis-for-total-distalization-of-the-mandibular-dentition-a-finite-element-study
#2
Jong-Moon Chae, Jae Hyun Park, Yukio Kojima, Kiyoshi Tai, Yoon-Ah Kook, Hee-Moon Kyung
INTRODUCTION: The aim of this finite element study was to analyze and clarify the mechanics of tooth movement patterns for total distalization of the mandibular dentition based on force angulation. METHODS: Long-term orthodontic movement of the mandibular dentition was simulated by accumulating the initial displacement of teeth produced by elastic deformation of the periodontal ligament. RESULTS: Displacement of each tooth was caused by movement of the whole dentition, elastic deflection of the archwire, and clearance gap between the archwire and bracket slot...
March 2019: American Journal of Orthodontics and Dentofacial Orthopedics
https://read.qxmd.com/read/30808372/occlusal-height-difference-between-maxillary-central-and-lateral-incisors-should-aesthetic-perception-influence-bracket-placement
#3
Jan Hourfar, Dirk Bister, Björn Ludwig, Gero Kinzinger, Jörg Alexander Lisson
BACKGROUND: The aim of this study was to verify anecdotal evidence that the maxillary central-to-lateral occlusal height difference (OHD) of more than 0.5 mm is a feature displayed in the majority of media and to discuss its implications for individualized orthodontic treatment planning. METHODS: Photographs of smiling female models were collected from a variety of printed advertisements and allocated to 3 groups (n = 30 each): 1 dental, 2 fashion and 3 orthodontics...
February 26, 2019: Head & Face Medicine
https://read.qxmd.com/read/30796001/effect-of-different-surface-treatment-methods-on-the-shear-bond-strength-of-orthodontic-brackets-to-temporary-crowns
#4
Hooman Zarif Najafi, Mina Moradi, Sepideh Torkan
INTRODUCTION: The number of adult patients seeking orthodontic treatment has been consistently increasing. Since the placing of the final restoration must be postponed until the completion of the orthodontic treatment, provisional restoration is recommended for the duration of the orthodontic treatment. These surfaces have special chemical properties, which necessitate the orthodontists to prepare the bonding area with special measures. METHODS: Polycarbonate and polymethylmethacrylate (PMMA) crowns (n=80) were randomly subdivided into 4 groups...
March 2019: International Orthodontics
https://read.qxmd.com/read/30795577/antibacterial-and-remineralizing-fillers-in-experimental-orthodontic-adhesives
#5
Carolina Jung Ferreira, Vicente Castelo Branco Leitune, Gabriela de Souza Balbinot, Felipe Weidenbach Degrazia, Marianna Arakelyan, Salvatore Sauro, Fabricio Mezzomo Collares
Orthodontic adhesives with antimicrobial and remineralizing properties may be an alternative to control white spot lesions around brackets. The aim of this study is to develop an experimental orthodontic adhesive containing boron nitride nanotubes (BNNT) and alkyl trimethyl ammonium bromide (ATAB). Methacrylate (BisGMA and TEGDMA) monomers were used to formulate the adhesives. Four experimental groups were produced with the addition of 0.1 wt.% BNNT (GBNNT ); 0.1 wt.% ATAB (GATAB ); and 0.2 wt.% BNNT with ATAB (GBNNT/ATAB ); in the control group, no fillers were added (GCtrl )...
February 21, 2019: Materials
https://read.qxmd.com/read/30790479/simulation-of-orthodontic-force-of-archwire-applied-to-full-dentition-using-virtual-bracket-displacement-method
#6
Xinwen Zhou, Yangzhou Gan, Qunfei Zhao, Jing Xiong, Zeyang Xia
OBJECTIVE: Orthodontic force simulation of tooth provides important guidance for clinical orthodontic treatment. However, previous studies did not involve the simulation of orthodontic force of archwire applied to full dentition. This study aimed to develop a method to simulate orthodontic force of tooth produced by loading a continuous archwire to full dentition using finite element method. METHOD: A three dimensional Tooth-Periodontal ligament-Bone Complex model of mandible was reconstructed from computed tomography images, and models of brackets and archwire were built...
February 20, 2019: International Journal for Numerical Methods in Biomedical Engineering
https://read.qxmd.com/read/30777735/european-college-of-orthodontics-commission-of-affiliation-and-titularisation-case-no-17153
#7
Amaia Goena
Date of birth: 17/11/1998; gender: female. A. PRE-TREATMENT DOCUMENTS: 11 years old; 02/2010. DIAGNOSIS: Angle's class: class II division 2. Missing teeth before treatment: none. TREATMENT PLANNING: Without extractions. Alignment, levelling and arch coordination with intermaxillary class II alastics. Intercuspidation, finishing. Damon's bimaxillary multi-bracket. Beginning of treatment: 12 years old; 10/2010. B. POST-TREATMENT DOCUMENTS: 14 years old; 11/2012...
February 15, 2019: International Orthodontics
https://read.qxmd.com/read/30777734/surface-topography-of-plain-nickel-titanium-niti-as-received-aesthetic-coated-niti-and-aesthetic-niti-archwires-sterilized-by-autoclaving-or-glutaraldehyde-immersion-a-profilometry-sem-afm-study
#8
Milad Shamohammadi, Elham Hormozi, Mehrnaz Moradinezhad, Mina Moradi, Masoumeh Skini, Vahid Rakhshan
BACKGROUND AND AIM: Surface topography is a crucial factor in bracket sliding mechanics. Literature on surface roughness of aesthetic archwires is scarce, and there is no study on surface topography of such archwires affected by any sterilization methods. The aim of this study was to compare the surface topography of plain nickel-titanium (NiTi) versus as-received aesthetic coated NiTi wires versus aesthetic wires sterilized by autoclaving or glutaraldehyde immersion. MATERIALS AND METHODS: This in vitro study was performed on 80 atomic force microscopy (AFM) observations, 160 profilometry observations, and 40 scanning electron microscopy (SEM) images from rectangular wires of the brands 'American Orthodontics, Ortho Organizers, SIA, and Gestenco'...
February 15, 2019: International Orthodontics
https://read.qxmd.com/read/30775705/the-effects-of-different-desensitizer-agents-on-shear-bond-strength-of-orthodontic-brackets-after-home-bleaching-an-in-vitro-study
#9
Nisa Gül Amuk, Aslı Baysal, Yakup Üstün, Gökmen Kurt
Purpose: The aim of this study was to test the null hypothesis that no difference exists between shear bond strength values of control and bleaching plus desensitizer applied groups. Materials and methods: A hundred freshly extracted human premolar teeth were randomly divided into five groups. Group I served as the control group with no bleaching application, while only bleaching was achieved in Group II. Desensitizer containing potassium nitrate-fluoride and casein phosphopeptide amorphous calcium phosphate were applied in Groups III and IV, after bleaching respectively...
May 2018: European Oral Research
https://read.qxmd.com/read/30772353/european-college-of-orthodontics-commission-of-affiliation-and-titularisation-case-no-17043
#10
Maria Dolores Olaizola Andonegui
Date of birth: 4/02/97; gender: female. PRE-TREATMENT DOCUMENTS: 13.7 years old; 09/2010. DIAGNOSIS: Angle's class: class II subdivision. Missing teeth before treatment: none. TREATMENT PLANNING: Extractions of four first premolars 14, 24, 34, 44. Class II molar and discrepancy correction. Intercuspidation, finishing. Bimaxillary multi-bracket. Beginning of treatment: 12 years old; 10/2010. POST-TREATMENT DOCUMENTS: 15...
February 13, 2019: International Orthodontics
https://read.qxmd.com/read/30770334/effect-of-different-surface-treatment-on-the-shear-bond-strength-of-metal-brackets-to-bleached-and-desensitized-enamel
#11
Hooman Zarif Najafi, Rafaat Bagheri, Hamid Reza Pakshir, Mohammad Amin Tavakkoli, Sepideh Torkan
INTRODUCTION: The aim of this study was to determine the effect of bleaching and desensitizing on shear bond strength (SBS) of metal brackets to enamel. METHODS: One hundred extracted human premolar were randomly assigned to 5 groups of 20. In the first group (control), no bleaching or desensitizing agent was used. Groups 2 to 5 were bleached with 37.5% hydrogen peroxide and desensitized with 6.0% potassium nitrate. Surface treatment comprised of etching for 15seconds in groups 1, 2 and 3, Er:yag laser irradiation and etching in group 4 and sandblasting and etching in group 5...
February 12, 2019: International Orthodontics
https://read.qxmd.com/read/30758513/comparison-of-force-loss-due-to-friction-of-different-wire-sizes-and-materials-in-conventional-and-new-self-ligating-orthodontic-brackets-during-simulated-canine-retraction
#12
Tarek El-Bialy, Ahmad Alobeid, Cornelius Dirk, Andreas Jäger, Ludger Keilig, Christoph Bourauel
AIMS: The aim of this study was to compare force loss due to friction (Fr) during simulated canine retraction using different archwire dimensions and materials between conventional and new self-ligating brackets. METHODS: The tested brackets were (1) conventional brackets (Victory series, GAC twin and FLI twin), (2) self-ligating brackets (Damon-Q, FLI-SL, new/improved FLI-SL (I FLI-SL), SPEED, GAC innovation (R) and Ortho Classic) and (3) a low-friction bracket (Synergy)...
February 13, 2019: Journal of Orofacial Orthopedics
https://read.qxmd.com/read/30723365/enamel-demineralization-around-two-different-orthodontic-bracket-adhesive-systems-an-in-vivo-study
#13
Naif A Almosa, Abdulmohsen M Alqasir, Mohammad A Aldekhayyil, Abdullah Aljelayel, Mohammed A Aldosari
Objective: To compare the enamel demineralization around the two precoated adhesive bracket systems, APC Flash-Free and APC PLUS (3M Unitek, Monrovia, CA, USA), in clinical settings. Material and method: This prospective experimental in-vivo study included 40 premolar teeth, which were planned for extraction due to orthodontic purposes. They were divided into two groups (Group A; n = 20 teeth were bonded with APC Flash Free ceramic brackets and group B; n = 20 teeth were bonded with APC Plus ceramic bracket)...
January 2019: Saudi Dental Journal
https://read.qxmd.com/read/30712696/photodynamic-inactivation-of-planktonic-cultures-and-streptococcus-mutans-biofilms-for-prevention-of-white-spot-lesions-during-orthodontic-treatment-an-in-vitro-investigation
#14
Maria Ângela Lacerda Rangel Esper, Juliana Campos Junqueira, Adjaci Fernandes Uchoa, Eduardo Bresciani, Alessandra Nara de Souza Rastelli, Ricardo Scarparo Navarro, Sérgio Eduardo de Paiva Gonçalves
INTRODUCTION: This study evaluated the efficacy of photodynamic inactivation (PDI) with hematoporphyrin IX (H) and modified hematoporphyrin IX (MH) at 10 μmol/L, using a blue light-emitting diode (LED), fluence of 75 J/cm,2 over planktonic cultures and biofilm of Streptococcus mutans (UA 159). METHODS: Suspensions containing 107 cells/mL were tested under different experimental conditions: a) H and LED (H+L+), b) MH and LED (MH+L+), c) only LED (P-L+), d) only H (H+L-), e) only MH (MH+L-), and f) control group, no LED or photosensitizer treatment (P-L-)...
February 2019: American Journal of Orthodontics and Dentofacial Orthopedics
https://read.qxmd.com/read/30704042/in-vitro-evaluation-of-experimental-self-adhesive-orthodontic-composites-used-to-bond-ceramic-brackets
#15
Ana Carolina Costa, Vicente Sabóia, Felipe Marçal, Nara Sena, Diego De Paula, Thyciana Ribeiro, Victor Feitosa
The aim of this study was to evaluate the degree of conversion (DC), flexural strength (FS), and shear bond strength (SBS) of ceramic brackets bonded to enamel with experimental self-adhesive orthodontic composites. Functional monomers 10-methacryloyloxy-decyl-dihydrogen-phosphate (MDP) and glycerol-dimethacrylate-phosphate (GDMA-P) were used in experimental composites. They were compared to the same composite without an acidic monomer (negative control) and with enamel acid-etching prior to adhesive application (positive control)...
January 30, 2019: Materials
https://read.qxmd.com/read/30701704/impact-of-a-non-fluoridated-microcrystalline-hydroxyapatite-dentifrice-on-enamel-caries-progression-in-highly-caries-susceptible-orthodontic-patients-a-randomized-controlled-6-month-trial
#16
Ulrich Schlagenhauf, Karl-Heinz Kunzelmann, Christian Hannig, Theodor W May, Helmut Hösl, Mario Gratza, Gabriele Viergutz, Marco Nazet, Sebastian Schamberger, Peter Proff
AIM: The aim of the present randomized, controlled trial was to compare the impact of the regular use of a fluoride-free microcrystalline hydroxyapatite (HAP) dentifrice and a 1400 ppm fluoride control dentifrice on caries progression in 150 highly caries-active orthodontic patients. METHODS: The primary outcome was the occurrence of lesions with International Caries Detection and Assessment System (ICDAS) ≥code 1 on the vestibular surfaces of teeth 15-25 within 168 days after fixation of orthodontic brackets...
January 30, 2019: Journal of Investigative and Clinical Dentistry
https://read.qxmd.com/read/30701220/the-effect-of-different-bleaching-treatments-and-thermal-mechanical-cycling-on-the-shear-bond-strength-of-orthodontic-brackets
#17
Lilian Nascimento Carlos, Olivia Santana Jorge, Luiz Renato Paranhos, Sergio Augusto de Freitas Vincenti, Fernanda de Carvalho Panzeri Pires-de-Souza
Objective: The aim of the present study was to compare the shear bond strength (SBS) of orthodontic brackets bonded to the enamel after at-home and in-office bleaching treatments. Methods: Sixty bovine incisors were subjected to initial color readings and then classified into three groups: CP (16% carbamide peroxide), HP (35% hydrogen peroxide), and C (control). After treatments, new color readout was obtained, and orthodontic brackets were bonded to the bleached area...
December 2018: Turkish Journal of Orthodontics
https://read.qxmd.com/read/30700640/finite-element-analysis-of-stress-in-maxillary-dentition-during-en-masse-retraction-with-implant-anchorage
#18
Masayoshi Suzuki, Kenji Sueishi, Hidenori Katada, Satoshi Togo
The goal of this study was to investigate how the height of the archwire hook and implant anchor affect tooth movement, stress in the teeth and alveolar bone, and the center of resistance during retraction of the entire maxillary dentition using a multibracket system. Computed tomography was used to scan a dried adult human skull with normal occlusion. Three-dimensional models of the maxillary bone, teeth, brackets, archwire, hook, and implant anchor were created and used for finite element analysis. The heights of the hook and the implant anchor were set at 0, 5, or 10 mm from the archwire...
January 31, 2019: Bulletin of Tokyo Dental College
https://read.qxmd.com/read/30695911/-analysis-of-the-discrepancy-of-crown-root-morphology-of-central-incisors-among-different-skeletal-malocclusion-using-cone-beam-ct
#19
X M Wang, J Wang, M Zou, J Zheng, H Xue
Objective: To investigate the discrepancy of crown-root morphology of upper and lower central incisors in adult patients with different skeletal malocclusions using cone-beam CT (CBCT). Methods: Patients visiting the Department of Orthodontics, College of Stomatology, Xi'an Jiaotong University from January 2015 to December 2017 were selected, including 108 cases (52 males, 56 females, aged from 18 to 30 years, mean age 25.8 years). According to CBCT data and cephalometric analysis, 66 patients with average angle were selected as the sagittal skeletal group, including 24 Class Ⅰ patients, 20 Class Ⅱ and 22 Class Ⅲ patients...
February 9, 2019: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://read.qxmd.com/read/30672987/effect-of-two-erosive-protocols-using-acidic-beverages-on-the-shear-bond-strength-of-orthodontic-brackets-to-bovine-enamel
#20
Catielma Nascimento Santos, Felipe de Souza Matos, Sigmar de Mello Rode, Paulo Francisco Cesar, Flávia Pardo Salata Nahsan, Luiz Renato Paranhos
OBJECTIVE: To assess the short-term effect of two in vitro erosive challenge protocols on the bond strength of metal orthodontic brackets on bovine enamel. METHODS: Sixty bovine incisors were selected and randomly divided into six groups: AS7 (artificial saliva - 7 days, Control Group); CC7 (Coca-Cola™ - 7 days); LJ7 (lime juice - 7 days); AS30 (artificial saliva - 30 days, Control Group); CC30 (Coca-Cola™ - 30 days); LJ30 (lime juice - 30 days). Microhardness testing was performed prior to the erosive challenge to verify the standardization of samples...
November 2018: Dental Press Journal of Orthodontics
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