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Adham Elsayed, Sebastian Wille, Majed Al-Akhali, Matthias Kern
STATEMENT OF PROBLEM: The whitish color of zirconia (ZrO2) abutments offers favorable esthetics compared with the grayish color of titanium (Ti) abutments. Nonetheless, ZrO2 has greater opacity, making it difficult to achieve natural tooth color. Therefore, lithium disilicate (LaT) abutments have been suggested to replace metal abutments. PURPOSE: The purpose of this in vitro study was to evaluate the fracture strength and failure mode of single-tooth implant restorations using ZrO2 and LaT abutments, and to compare them with titanium (Ti) abutments...
October 18, 2016: Journal of Prosthetic Dentistry
Joanna Janiszewska-Olszowska, Robert Tomkowski, Katarzyna Tandecka, Piotr Stepien, Tomasz Szatkiewicz, Katarzyna Sporniak-Tutak, Katarzyna Grocholewicz
BACKGROUND: Termination of fixed orthodontic treatment is associated with bracket debonding and residual adhesive removal. These procedures increase enamel roughness to a degree that should depend on the tool used. Enamel roughening may be associated with bacterial retention and staining. However, a very limited data exists on the alteration of 3D enamel roughness resulting from the use of different tools for orthodontic clean-up. AIMS: 1. To perform a precise assessment of 3D enamel surface roughness resulting from residual adhesive removal following orthodontic debonding molar tubes...
2016: PeerJ
Fawaz L Almutairi, Samantha J Hodges, Nigel P Hunt
OBJECTIVE: To investigate the treatment outcome in terms of the malocclusion features and the changes in the occlusion of patients undergoing orthodontic/orthognathic treatment using the Peer Assessment Rating (PAR) and the Index of Complexity, Outcome and Need (ICON) and to test the application of the Index of Orthognathic Functional Treatment Need (IOFTN) on this sample as a measure of orthognathic pre-treatment need. DESIGN: Retrospective longitudinal cohort study...
October 17, 2016: Journal of Orthodontics
Vincenzo Grassia, Enrica Gentile, Dario Di Stasio, Abdolreza Jamilian, Giovanni Matarese, Fabrizia D'Apuzzo, Rossella Santoro, Letizia Perillo, Rosario Serpico, Alberta Lucchese
After orthodontic treatment with fixed appliances, bonded brackets and residual adhesive must be removed. This procedure should lead to restitutio ad integrum of the enamel or, at least, restore the enamel surface as closely as possible to its pre-treatment conditions. The purpose of this study is the in vivo assessment at a microscopic resolution of enamel surfaces after bracket debonding while avoiding the tooth extraction. Nine orthodontic patients who had brackets removed at the conclusion of orthodontic treatment were enrolled...
October 13, 2016: Ultrastructural Pathology
Shaoting Lin, Tal Cohen, Teng Zhang, Hyunwoo Yuk, Rohan Abeyaratne, Xuanhe Zhao
Soft elastic layers with top and bottom surfaces adhered to rigid bodies are abundant in biological organisms and engineering applications. As the rigid bodies are pulled apart, the stressed layer can exhibit various modes of mechanical instabilities. In cases where the layer's thickness is much smaller than its length and width, the dominant modes that have been studied are the cavitation, interfacial and fingering instabilities. Here we report a new mode of instability which emerges if the thickness of the constrained elastic layer is comparable to or smaller than its width...
October 12, 2016: Soft Matter
Federico Tirone, Stefano Salzano, Erik Rolando
BACKGROUND: Microdontia of the maxillary anterior teeth occurs quite frequently but is poorly documented. The literature describes several treatment choices, which are often focused on an orthodontic approach rather than a restorative one. The latest trends in restorative dentistry and the new ceramic materials, such as lithium disilicate, allow clinicians to perform esthetic rehabilitations based on microinvasive approaches that are most appropriate for younger patients. SUMMARY: Four patients, all employed in the field of dentistry, presented at our dental practice complaining of diastemata between their maxillary anterior teeth...
2016: International Journal of Esthetic Dentistry
L Kilponen, L Lassila, M Tolvanen, J Varrela, P K Vallittu
Objective. To examine the effect of removing the surface layer of enamel on the rebonding strength of resin composite. Methods. Teeth in four groups (n = 10) were etched, a small amount of resin composite was bonded and debonded, then specimens in three groups were ground for different lengths of time (10 s, 20 s, 30 s) to remove an increasing amount of enamel, one group was left untouched. The teeth were bonded again and the bond strengths of 1st and 2nd bonding were compared and analysed against the amount of enamel loss in different groups (7 µm (±2); 12 µm (±1); 16 µm (±3))...
2016: BioMed Research International
Daniela D Pompeo, Henrique D Rosário, Beatriz Mv Lopes, Paulo F Cesar, Luiz Renato Paranhos
CONTEXT: Bracket debonding is a common problem during orthodontic treatment. This type of failure is associated to masticatory forces, poor adhesion, and the need for repositioning the piece. AIMS: The objective of this work was to compare the shear bond strength of debonded brackets that were reconditioned using different protocols (alumina blasting versus hydrofluoric etching). SETTINGS AND DESIGN: This was an in vitro experimental study with 45 stainless steel orthodontic brackets...
July 2016: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Jeong Joon Han, Jong-Hyon Chong, Sun-Youl Ryu, Hee-Kyun Oh, Hong-Ju Park, Seunggon Jung, Min-Suk Kook
OBJECTIVES: This study aimed to compare preoperatively predicted rotational relapse with actual post-treatment mandibular position after mandibular setback surgery via the surgery-first approach and to evaluate the effect of the increase of vertical dimension (VD) on surgical occlusion and the amount of mandibular setback on postoperative mandibular positional changes. STUDY DESIGN: Twenty-nine patients who underwent bilateral sagittal split ramus osteotomy for mandibular prognathism were evaluated by using lateral cephalograms, which had been obtained preoperatively, immediately postoperatively, and immediately after debonding...
July 30, 2016: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Niko C Bock, Laura Seibold, Christian Heumann, Erhard Gnandt, Miriam Röder, Sabine Ruf
BACKGROUND: White spot lesions (WSL) frequently occur as side-effect of multibracket appliance treatment. The clinical effects of local fluoridation on post-orthodontic WSL and oral health development are however inconclusive. OBJECTIVE: In vivo monitoring of clinical WSL and oral health changes in response to weekly 1.25 per cent fluoride gel application after multibracket appliance treatment. TRIAL DESIGN: Randomized, single-centre, double-blind, parallel-group, placebo-controlled study...
October 4, 2016: European Journal of Orthodontics
Niko C Bock, Laura Seibold, Christian Heumann, Erhard Gnandt, Miriam Röder, Sabine Ruf
BACKGROUND: White spot lesions (WSLs) are a frequent side-effect of multibracket appliance treatment. The effect of local fluoridation on post-orthodontic WSL is however inconclusive. OBJECTIVE: Assessment of WSL changes in response to weekly 1.25 per cent fluoride gel application after multibracket appliance treatment. TRIAL DESIGN: Randomized, single-centre, double-blind, parallel-group, placebo-controlled study. PARTICIPANTS: Patients with not less than 1 WSL (modified score 1 or 2) on not less than 1 upper front teeth after debonding...
October 4, 2016: European Journal of Orthodontics
Jonas Gugger, Nikolaos Pandis, Spiros Zinelis, Raphael Patcas, George Eliades, Theodore Eliades
INTRODUCTION: Our objective was to analyze the surface and bulk properties alterations of clinically aged composites used for fixed retention. METHODS: Twenty-six lingual retainers bonded for different time periods (2.2-17.4 years) were retrieved from postorthodontic patients. Fifteen lingual retainers had been cemented by a chemically cured adhesive (Maximum Cure, Reliance Orthodontic Products, Itasca, Ill), and 11 were treated with a photo-cured adhesive (Flow-Tain, Reliance Orthodontic Products)...
October 2016: American Journal of Orthodontics and Dentofacial Orthopedics
Sanja Jurišić, Gordan Jurišić, Hrvoje Jurić
AIM: The objective of present study was to examine influence of adhesives and methods of enamel pretreatment on the shear bond strength (SBS) of orthodontic brackets. The adhesives used were resin-reinforced glass ionomer cements-GIC (Fuji Ortho LC) and composite resin (Transbond XT). MATERIAL AND METHODS: The experimental sample consisted of 80 extracted human first premolars. The sample was divided into four equal groups, and the metal brackets were bonded with different enamel pretreatments by using two adhesives: group A-10% polyacrylic acid; Fuji Ortho LC, group B-37% phosphoric acid; Fuji Ortho LC, group C-self etching primer; Transbond XT, group D-37% phosphoric acid, primer; Transbond XT...
December 2015: Acta Stomatologica Croatica
Jiaojiao Ren, Lijuan Li, Dandan Zhang, Xiaoli Qiao, Qiongying Lv, Guohua Cao
With the wide use of high-temperature-resistant ceramic matrix composites (CMCs) in aviation and space flight, it is important to detect the quality of the bonding. This paper used terahertz (THz) time-domain spectroscopy nondestructive testing technology to inspect the bonding defects of the CMC. This paper puts forward a method-extraction method, which is applied to make samples to simulate the bonding defect of CMC by embedding polytetrafluoroethylene (PTFE) sheets with 0.12 mm thickness into the adhesive layer and extracting it after curing and presetting the bonding defects...
September 10, 2016: Applied Optics
Mojgan Kachoei, Amir Mohammadi, Maziar Esmaili Moghaddam, Sahand Rikhtegaran, Mahmoud Pourghaznein, Sajjad Shirazi
Background. Failure of orthodontic bracket bonds is a common occurrence during orthodontic treatment. Different techniques have been suggested in the literature to remove resin residues from the bracket bases and enamel surfaces to prepare the surfaces again after debonding. This study attempted to compare multiple rebond shear strengths (SBS) of debonded brackets following preparation with sandblasting and CO2 laser. Methods. The brackets were bonded on 30 human and bovine maxillary central incisors using self-curing composite resin...
2016: Journal of Dental Research, Dental Clinics, Dental Prospects
Yoko Mizuno, Tomoya Gonda, Toshihito Takahashi, Akiko Tomita, Yoshinobu Maeda
PURPOSE: Root fracture is a common and serious cause of abutment tooth loss. No studies to date have comprehensively assessed the individual contributions of the factors that increase stress on abutment teeth. The purpose of this study was to analyze the stress distribution in abutment teeth based on a three-dimensional finite element model and to analyze the factors that affect stress distribution. MATERIALS AND METHODS: Models were generated from the computed tomography data of a single patient, consisting of a mandibular second premolar abutment tooth, bone, residual mucous membrane, and a partial removable dental prosthesis (PRDP)...
September 2016: International Journal of Prosthodontics
Woo-Sun Jung, Kyungsun Kim, Soha Cho, Sug-Joon Ahn
INTRODUCTION: Our aims were to analyze adhesion of periodontopathogens to self-ligating brackets (Clarity-SL [CSL], Clippy-C [CC] and Damon Q [DQ]) and to identify the relationships between bacterial adhesion and oral hygiene indexes. METHODS: Central incisor brackets from the maxilla and mandible were collected from 60 patients at debonding after the plaque and gingival indexes were measured. Adhesions of Aggregatibacter actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg), Prevotella intermedia (Pi), Fusobacterium nucleatum (Fn), and Tannerella forsythia (Tf) were quantitatively determined using real-time polymerase chain reactions...
September 2016: American Journal of Orthodontics and Dentofacial Orthopedics
Niamh O'Rourke, Hussein Albeedh, Pratik Sharma, Ama Johal
INTRODUCTION: The objective of this prospective trial was to compare the clinical effectiveness of bonded retainers with vacuum-formed retainers, in terms of maintaining the results of orthodontic treatment in the lower arch up to 18 months post debond. METHODS: This was a hospital-based, prospective randomized controlled clinical trial in which a total of 82 subjects were randomly allocated using a computer-generated number sequence to 1 of 2 groups, receiving either a vacuum-formed retainer (Essix Ace plastic (120 mm; DENTSPLY Raintree Essix, Sarasota, Fla) or a bonded retainer (0...
September 2016: American Journal of Orthodontics and Dentofacial Orthopedics
Aydin Sohrabi, Sanaz Jafari, Soodabeh Kimyai, Sahand Rikhtehgaran
OBJECTIVE: Since there is no standard method for rebonding loose ceramic brackets, the aim of this study was to evaluate the possibility of using Er,Cr:YSGG laser to eliminate the remaining composite materials from the base of ceramic brackets and to compare the bond strength of rebonded brackets with the new ones. MATERIALS AND METHODS: Sixty-two extracted human premolars were mounted in acrylic cylinders. Thirty-one ceramic brackets were bonded, and shear bond strength was tested using Hounsfield testing machine...
October 2016: Photomedicine and Laser Surgery
Wolfgang Bömicke, Stefan Rues, Verena Hlavacek, Peter Rammelsberg, Marc Schmitter
OBJECTIVES: To compare ultimate fracture load (Fu ), load at first damage (F1d ), and fracture pattern for posterior fixed dental prostheses (FDPs) manufactured from translucent, yttria-stabilized zirconia polycrystal. METHODS: Premolar-size FDPs in 4 test groups (n = 16/group) were constructed as veneered complete crown-retained (group 1), monolithic complete crown-retained (group 2), monolithic partial veneer crown-retained (group 3), or monolithic resin-bonded (group 4) prostheses with minimum zirconia wall thickness (0...
August 26, 2016: Journal of Esthetic and Restorative Dentistry
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