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Orthodontics

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https://www.readbyqxmd.com/read/28821826/osteocyte-regulation-of-orthodontic-force-mediated-tooth-movement-via-rankl-expression
#1
Ayumi Shoji-Matsunaga, Takehito Ono, Mikihito Hayashi, Hiroshi Takayanagi, Keiji Moriyama, Tomoki Nakashima
Orthodontic tooth movement is achieved by the remodeling of the alveolar bone surrounding roots of teeth. Upon the application of orthodontic force, osteoclastic bone resorption occurs on the compression side of alveolar bone, towards which the teeth are driven. However, the molecular basis for the regulatory mechanisms underlying alveolar bone remodeling has not been sufficiently elucidated. Osteoclastogenesis is regulated by receptor activator of nuclear factor-κB ligand (RANKL), which is postulated to be expressed by the cells surrounding the tooth roots...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820630/academic-orthodontic-opportunities
#2
(no author information available yet)
No abstract text is available yet for this article.
September 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28819572/a-cad-cam-zirconium-bar-as-a-bonded-mandibular-fixed-retainer-a-novel-approach-with-two-year-follow-up
#3
Maen Zreaqat, Rozita Hassan, Abdul Fatah Hanoun
Stainless steel alloys containing 8% to 12% nickel and 17% to 22% chromium are generally used in orthodontic appliances. A major concern has been the performance of alloys in the environment in which they are intended to function in the oral cavity. Biodegradation and metal release increase the risk of hypersensitivity and cytotoxicity. This case report describes for the first time a CAD/CAM zirconium bar as a bonded mandibular fixed retainer with 2-year follow-up in a patient who is subjected to long-term treatment with fixed orthodontic appliance and suspected to have metal hypersensitivity as shown by the considerable increase of nickel and chromium concentrations in a sample of patient's unstimulated saliva...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28818647/malocclusion-class-ii-division-1-skeletal-and-dental-relationships-measured-by-cone-beam-computed-tomography
#4
Yiling Xu, Heesoo Oh, Manuel O Lagravère
OBJECTIVES: The purpose of this study was to locate traditionally-used landmarks in two-dimensional (2D) images and newly-suggested ones in three-dimensional (3D) images (cone-beam computer tomographies [CBCTs]) and determine possible relationships between them to categorize patients with Class II-1 malocclusion. METHODS: CBCTs from 30 patients diagnosed with Class II-1 malocclusion were obtained from the University of Alberta Graduate Orthodontic Program database...
August 14, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28818059/influence-of-sense-of-coherence-on-adolescents-self-perceived-dental-aesthetics-a-cross-sectional-study
#5
Aline Cavalcanti da Costa, Fabrícia Soares Rodrigues, Priscila Prosini da Fonte, Aronita Rosenblatt, Nicola Patricia Thérèse Innes, Mônica Vilela Heimer
BACKGROUND: Sense of coherence (SOC) is a psychosocial factor capable of influencing perception of health, improving one's ability to manage life. It is the central construct of salutogenesis. SOC allows for identification and mobilization of resources to effectively manage or solve problems, promoting health and quality of life. Using Wilson-Cleary's conceptual model we hypothesized that SOC might contribute to self-perception of dental aesthetics. The aim of this study was to investigate whether SOC levels were related to self-perception of dental aesthetics against assessed normative orthodontic treatment need among adolescents...
August 17, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28816300/-combination-of-periodontal-orthodontic-and-endodontic-therapy-in-upper-anterior-teeth-with-hopeless-prognosis-and-long-time-follow-up-a-case-report
#6
Y Li, L Xu, Y H Zhou, X Y Ouyang, T Cao
It is complicated to decide the treatment plan of hopeless anterior teeth in esthetic zone due to severe periodontitis, periodontal-endodontic combined lesion or teeth trauma. The optional treatment plan for this kind of teeth includes retention after periodontal treatment, extraction and implant treatment, extraction and prosthodontic treatment and so on. To make an appropriate treatment plan, patients' periodontal conditions, periodontal biotype, local anatomy, esthetic demand, economic condition and social psychological status should be comprehensively considered...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28816295/-three-dimensional-data-fusion-method-for-tooth-crown-and-root-based-on-curvature-continuity-algorithm
#7
Y J Zhao, Y Liu, Y C Sun, Y Wang
OBJECTIVE: To explore a three-dimensional (3D) data fusion and integration method of optical scanning tooth crowns and cone beam CT (CBCT) reconstructing tooth roots for their natural transition in the 3D profile. METHODS: One mild dental crowding case was chosen from orthodontics clinics with full denture. The CBCT data were acquired to reconstruct the dental model with tooth roots by Mimics 17.0 medical imaging software, and the optical impression was taken to obtain the dentition model with high precision physiological contour of crowns by Smart Optics dental scanner...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28816292/-precision-of-three-dimensional-printed-brackets
#8
D Zhang, L C Wang, Y H Zhou, X M Liu, J Li
OBJECTIVE: This study was based on digital orthodontic diagnosis work flow for indirect bonding transfer tray model design and three-dimensional (3D) printing, and the aim of this paper was to inspect the dimensional accuracyof 3D printed brackets, which is the foundation of the follow up work and hoped that will illuminate the clinical application of the digital orthodontics work flow. METHODS: The samples which consisted of 14 cases of patients with malocclusion from Department of Orthodontics Peking University were selected, including 8 cases with tooth extraction and 6 cases without tooth extraction...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28816195/pentraxin-3-levels-in-gingival-crevicular-fluid-during-canine-retraction-with-nickel-titanium-coil-spring-and-active-tieback
#9
Rakesh Thukral, Sukhpreet Mangat, Anvesha Ganguly, Sanket S Agarkar, Harleen Bali, Shekhar Grover
AIM: Orthodontic treatment is routinely carried out in patients with the purpose of correcting various forms of dental malocclusions. Retraction of the canines can be achieved either individually or along with incisor. Pentraxin-3 (PTX-3) is regarded as the true independent indicator of disease activity. Hence, we undertook the present study to assess and compare the level of PTX-3 in patients undergoing canine retraction with active tieback and Nickel-Titanium (NiTi) coil spring. MATERIALS AND METHODS: The present study included assessment of 25 patients that underwent canine retraction as a part of fixed orthodontic treatment...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28816193/gingival-zenith-positions-and-levels-of-maxillary-anterior-dentition-in-cases-of-bimaxillary-protrusion-a-morphometric-analysis
#10
Snigdha Gowd, T Shankar, Suravi Chatterjee, Pritam Mohanty, Nivedita Sahoo, Srinivas Baratam
AIM: To investigate the two clinical parameters, such as gingival zenith positions (GZPs) and gingival zenith levels (GZLs), of maxillary anterior dentition in bimaxillary protrusion cases and collate it with severiety of crown inclination. MATERIALS AND METHODS: Gingival zenith position and GZL in 40 healthy patients (29 females and 11 males) with an average age of 21.5 years were assessed. Inclusion criteria involved absence of periodontal diseases, Angle's class I molar relationship, and upper anterior proclination within 25 to 45° based on Steiner's analysis; exclusion criteria included spacing, crowding, anterior restoration and teeth with incisor attrition or rotation...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28816188/assessment-of-changes-in-nickel-and-chromium-levels-in-the-gingival-crevicular-fluid-during-fixed-orthodontic-treatment
#11
Vinny Bhasin, Swati J Pustake, Viprat Joshi, Anil Tiwari, Meenakshi Bhasin, Ramandeep S Punia
BACKGROUND: Various components of appliances used in fixed orthodontic treatment are fabricated from materials that are highly resistant in nature and have high strength and biocompatibility. Corrosion of materials occurs inside the oral cavity due to numerous environmental or oral factors that act on them. These factors include temperature, pH variation, salivary conditions, mechanical loads, microbiological and enzymatic activity, and various food components. Gingival crevicular fluid (GCF) is the material obtained from the gingival sulcus and might act as a potential source for various biomarkers in the orthodontic setup because inflammatory-induced response is directly related to orthodontic forces in GCF...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28816185/an-in-vitro-evaluation-of-friction-characteristics-of-conventional-stainless-steel-and-self-ligating-stainless-steel-brackets-with-different-dimensions-of-archwires-in-various-bracket-archwire-combination
#12
K Sridharan, Shailesh Sandbhor, U B Rajasekaran, George Sam, M Mohamed Ramees, Esther A Abraham
AIM: The purpose of this research is to compare the frictional attributes of stainless steel conventional brackets and self-ligating stainless steel brackets with different dimensions of archwires. MATERIALS AND METHODS: The test was carried with two sets of maxillary brackets: (1) Conventional stainless steel (Victory Series), (2) stainless steel self-ligating (SmartClip) without first premolar brackets. Stainless steel, nickel-titanium (NiTi), and beta-Ti which are the types of orthodontic wire alloys were tested in this study...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28815255/-investigation-of-related-risk-factors-of-temporomandibular-disorders-in-109-patients
#13
Xin-Xin Hu, Yao-Min Zhu, Liu-Ting He, Ying Gu, Zhi-Gang Liang, Cang-Shang Zheng
PURPOSE: To investigate the related risk factors of temporomandibular disorders(TMD), and to provide evidences for clinical prevention. METHODS: One hundred and nine TMD patients were included in the study as case group, while 109 people with no TMJ symptoms and signs were selected randomly as control group. All subjects fulfilled questionaires. Logistics regression analysis was used to analyze the data with SPSS 22.0 software package. RESULTS: Females patients were more common than males, with 20~29 age group accounting for 44%...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28815247/-changes-of-cementum-endotoxin-levels-in-different-teeth-with-periodontitis-treated-with-root-conditioning
#14
Chang-Sheng Fu, Rong-Sen Liu, Yun Luo, Long Ou, Ying-Chao Li, Xian-Hua Zhang
PURPOSE: To observe the changes of endotoxin levels after different teeth with periodontitis were treated with different methods. METHODS: Six healthy premolars extracted for orthodontic reasons and 36 posterior teeth extracted due to severe periodontitis were selected. Each tooth was processed from two 4 mm×4 mm×1 mm cementum pieces 2 mm under the cementum-enamel junction, each tooth with periodontitis was numbered. Healthy teeth served as negative control group, one of the two tablets from each tooth with periodontitis was selected in the periodontitis group, which was not treated with root surface treatment...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28815243/-effects-of-emd-on-relapse-and-root-repair-after-orthodontic-tooth-movement-in-rats
#15
Qin Hu, Xiao-Lin Xu, Jian-Ping Zhou, Hong-Wei Dai
PURPOSE: To study the effect of enamel matrix derivative(EMD) on root repair and tooth movement relapse after orthodontic tooth movement in rats. METHODS: Twenty 10-weeks old male rats were divided into experimental and control group randomly (n=10). 100 g force was exerted to the left maxillary first molars for 14 days and then removed. EMD was injected in rats in the experimental group since appliance was removed. The control group received no injection. Micro-CT was taken to analyze the changes of root resorption volume and distance of tooth movement...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28814141/effects-of-calcitonin-on-orthodontic-tooth-movement-and-associated-root-resorption-in-rats
#16
Ling Guan, Suai Lin, Weijun Yan, Lei Chen, Xiaofeng Wang
OBJECTIVES: Our main aim was to evaluate the effects of calcitonin (CT) on orthodontic tooth movement (OTM) and orthodontic root resorption in a rat model. MATERIAL AND METHODS: Eighty male Wistar rats were randomly divided into five groups. Rats in the negative control group were not given any appliances or injections. All the remaining rats were used to establish a model of OTM. The positive control group were then injected with normal saline, while rats in the three experimental groups were injected with 0...
August 17, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28809084/practice-characteristics-and-service-provision-rates-of-dental-hygienists-in-australia
#17
N Amarasena, D N Teusner, D S Brennan, J Satur
INTRODUCTION: Dental hygienists (DHs) have been practising in Australia since the early 1970s. OBJECTIVE: This study describes the clinical activity of Australian DHs. METHODS: A questionnaire was mailed to members of two professional associations representing DHs. Practitioner characteristics, employment characteristics and clinical activity on a self-reported typical practice day were collected. The proportion of each service item of all services provided was estimated...
August 14, 2017: International Journal of Dental Hygiene
https://www.readbyqxmd.com/read/28808462/temperature-rises-in-the-pulp-chamber-with-different-techniques-of-orthodontic-adhesive-removal
#18
Maurício Barbieri Mezomo, Juliana Abreu, Juliana Weber, Renato Dalla Porta Garcia, José Antônio Poli Figueiredo, Eduardo Martinelli de Lima
INTRODUCTION: The aim of this in vitro study was to compare the temperature rises in the pulp chamber and time spent with different techniques for orthodontic resin adhesive removal. METHODS AND MATERIALS: Adhesive removal was performed in 20 extracted human maxillary second premolars with five techniques: high-speed tungsten carbide burs with water-cooling (BurH-cool) and without cooling (BurH), low-speed carbide burs (BurL), low-speed aluminum-oxide discs (DiscL), and low-speed fiberglass burs (BurFGL)...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28807370/descriptive-analysis-of-factors-associated-with-external-cervical-resorption
#19
Athina M Mavridou, Lars Bergmans, Dick Barendregt, Paul Lambrechts
INTRODUCTION: The aim of this study was to perform a descriptive analysis of the occurrence of external cervical resorption (ECR) in relation to the patients' characteristics (sex, age, and tooth type) and the potentially involved predisposing factors. METHODS: This study includes data on 284 patients (337 teeth with evidence of ECR) referred to the University Hospital Leuven (Leuven, Belgium) and Endo Rotterdam (Rotterdam, the Netherlands) for diagnosis and treatment from 2010 to 2015...
August 11, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28806378/gummy-smile-correction-using-lingual-orthodontics-and-augmented-corticotomy-in-extremely-thin-alveolar-housing
#20
Kyung-Yen Nahm, Seung-Yun Shin, Hyo-Won Ahn, Seong-Hun Kim, Gerald Nelson
BACKGROUND: Tooth movement out of anatomic limitations was assisted by augmented corticotomy using deproteinized bovine bone mineral. METHODS: Lip protrusion can be reduced by premolar extraction followed by retraction of the anterior teeth. Surgical intervention is appropriate when the alveolar bone housing of the anterior region is insufficient for the tooth movement. In this patient, corticotomy in upper palatal area and anterior segmented osteotomy in the mandible were performed...
August 10, 2017: Journal of Craniofacial Surgery
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