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Angle Orthodontist

Humihiro Matsuzawa, Naoko Toriya, Yuya Nakao, Moe Konno-Nagasaka, Toshiya Arakawa, Miki Okayama, Itaru Mizoguchi
OBJECTIVE: To clarify the mechanism of root resorption during orthodontic treatment, we examined cementocyte cell death and root resorption in the cellular cementum on the pressure side during experimental tooth movement. MATERIALS AND METHODS: Using 8-week-old male Wistar rats, the right first molar was pushed mesiobuccally with a force of 40 g by a Ni-Ti alloy wire while the contralateral first molar was used as a control. Localization and number of cleaved caspase-3-positive and single-stranded DNA (ssDNA) - positive cells were evaluated using dual-label immunohistochemistry with anticleaved caspase-3 and anti-ssDNA antibodies...
December 1, 2016: Angle Orthodontist
Thorsten Grünheid, Danae C Kirk, Brent E Larson
OBJECTIVE: To evaluate the effect of root and bone visibility on orthodontists' perceptions of the quality of treatment simulations. MATERIAL AND METHODS: An online survey was used to present orthodontists with setups generated for 10 patients in two different types of view: with and without bone and roots as modeled from a cone-beam computed tomography (CBCT) scan. The orthodontists were asked to rate the quality of the setups from poor to ideal on a 100-point visual analog scale and, if applicable, to identify features of concern that led them to giving a setup a less-than-ideal rating...
November 22, 2016: Angle Orthodontist
Alexandra D Best, Bhavna Shroff, Caroline K Carrico, Steven J Lindauer
OBJECTIVE: To investigate differences in case selection, treatment management, and aligner treatment expertise between orthodontists and general practitioners. MATERIALS AND METHODS: A parallel pair of original surveys with three sections (case selection, treatment management, and demographics) was sent to orthodontists (N = 1000) and general dentists (N = 1000) who were providers of aligner treatment. RESULTS: Orthodontists had treated significantly more patients with aligners, had treated more patients with aligners in the previous 12 months, and had received more aligner training than general dentists (P < ...
November 22, 2016: Angle Orthodontist
Mohammad Moaffak A AlSayed Hasan, Kinda Sultan, Omar Hamadah
OBJECTIVE: To evaluate the effectiveness of low-level laser therapy (LLLT) in accelerating orthodontic tooth movement of crowded maxillary incisors. MATERIALS AND METHODS: This two-arm, parallel-group, randomized controlled trial involved 26 patients with severe to extreme maxillary incisors irregularity according to Little's irregularity index, indicating two first premolars extraction. Patients were randomly assigned to either the laser group or the control group (13 each)...
November 21, 2016: Angle Orthodontist
Kirubaharan S Abraham, Nithya Jagdish, Vignesh Kailasam, Sridevi Padmanabhan
OBJECTIVES: To compare the adhesion of Streptococcus mutans to nickel titanium (NiTi) and copper-NiTi (Cu-NiTi) archwires and to correlate the adhesion to surface characteristics (surface free energy and surface roughness) of these wires. MATERIALS AND METHODS: A total of 16 patients undergoing orthodontic treatment with preadjusted edgewise appliances were included in the study. 0.016" and 0.016" × 0.022" NiTi and Cu-NiTi archwires in as-received condition and after 4 weeks of intraoral use were studied for S mutans adhesion using real-time polymerase chain reaction...
November 16, 2016: Angle Orthodontist
Rehaf H Albanna, Hisham M Farawanah, Abdullah M Aldrees
OBJECTIVE: To compare effectiveness of brushing an Essix retainer with water only and brushing followed by soaking in one of three commercial cleansing tablets. MATERIALS AND METHODS: A double-blind, parallel, randomized clinical trial with a split-mouth design was completed with 60 volunteers with specific eligibility criteria assigned to three groups to compare the cleansing effectiveness of brushing an Essix retainer with water only, followed by soaking in one of three alkaline peroxide-based commercial cleansing tablets (Retainer Brite(®), Kukis(®), and Corega(®))...
November 15, 2016: Angle Orthodontist
David Lee, Giseon Heo, Tarek El-Bialy, Jason P Carey, Paul W Major, Dan L Romanyk
OBJECTIVE: To investigate initial forces acting on teeth around the arch during en masse retraction using an in vitro Orthodontic SIMulator (OSIM). MATERIALS AND METHODS: The OSIM was used to represent the full maxillary arch in a case wherein both first premolars had been extracted. Dental and skeletal anchorage to a posted archwire and skeletal anchorage to a 10-mm power arm were all simulated. A 0.019 × 0.025-inch stainless steel archwire was used in all cases, and 15-mm light nickel-titanium springs were activated to approximately 150 g on both sides of the arch...
November 10, 2016: Angle Orthodontist
Sérgio Estelita Barros, Denise Ficht, Guilherme Janson, Kelly Chiqueto, Eduardo Ferreira
OBJECTIVE: To evaluate the null hypothesis that there is no difference between the vertical compensation necessary to level the clinical crown centers and that required to level the marginal ridges. MATERIALS AND METHODS: Initial dental casts selected from 200 patients that met the selection criteria were included. The vertical position of the clinical crown center (VPCC) and marginal ridge (VPMR) of posterior teeth were measured in both arches using a digital height gauge with 0...
November 8, 2016: Angle Orthodontist
Maurício Tatsuei Sakima, Michel Dalstra, Angelo Vicentini Loiola, Gustavo Hauber Gameiro
OBJECTIVE: To evaluate the force systems produced by transpalatal arches (TPAs) activated according to the six classes of geometries described by Burstone and Koenig. MATERIALS AND METHODS: Sixty appliances were tested for first-order activations using a mechanical force testing system. The TPAs were first checked for passivity in sagittal, transverse, and vertical planes at the measuring machine. Then 10 appliances per group were activated using a millimeter template to obtain the six classes of geometries, and the activated appliances were inserted into lingual tubes of the Force System Identification machine that recorded the deactivation forces and moments delivered by both terminal ends of the TPAs...
November 8, 2016: Angle Orthodontist
Jianru Yi, Yimin Sun, Yu Li, Chunjie Li, Xiaobing Li, Zhihe Zhao
OBJECTIVE: To compare the diagnostic accuracy of cone-beam computed tomography (CBCT) and periapical radiographs (PR) for the detection of external root resorption (ERR). MATERIAL AND METHODS: An electronic search in databases, including the Cochrane Central Register of Controlled Trials, PubMed, Embase, the China National Knowledge Infrastructure, and System for Information on Grey Literature in Europe (SIGLE), was performed until August 2016. A manual search of relevant journals and reference lists of enrolled studies was conducted...
November 4, 2016: Angle Orthodontist
Leonardo Koerich, André Weissheimer, Luciane Macedo de Menezes, Steven J Lindauer
OBJECTIVE: To evaluate the precision and reproducibility of a protocol to perform rapid voxel-based superimposition of the mandible in growing patients using CBCT. MATERIALS AND METHODS: The sample comprised two cone-beam computed tomography scans taken at least 1 year apart from each of 24 growing patients. Voxel-based superimposition was performed by two examiners independently. The internal part of the symphysis extending to the first molar was used as the reference...
October 21, 2016: Angle Orthodontist
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
Roberta Lione, Francesca Gazzani, Chiara Pavoni, Stefano Guarino, Vincenzo Tagliaferri, Paola Cozza
OBJECTIVE: To test in vitro and in vivo the wear performance of diamond-coated strips by means of tribological testing and scanning electronic microscope (SEM). MATERIALS AND METHODS: To evaluate the in vitro wear performance, a tribological test was performed by a standard tribometer. The abrasive strips slid against stationary, freshly extracted premolars fixed in resin blocks, at a 2-newton load. At the end of the tribological test, the residual surface of the strip was observed by means of SEM analysis, which was performed every 50 meters until reaching 300 meters...
October 13, 2016: Angle Orthodontist
Isil Aras, Aylin Pasaoglu
OBJECTIVE: To compare the effectiveness of comprehensive fixed appliance treatments implemented in combination with Forsus or intermaxillary elastics in Class II subdivision subjects. MATERIALS AND METHODS: Twenty-eight Class II subdivision patients were allocated to two groups using matched randomization: Forsus group (mean age, 14.19 ± 1.02 years) and elastics group (mean age, 13.75 ± 1.16 years). Patients received fixed appliance therapy in combination with either Forsus or intermaxillary elastics...
October 13, 2016: Angle Orthodontist
Takeshi Muguruma, Masahiro Iijima, Toshihiro Yuasa, Kyotaro Kawaguchi, Itaru Mizoguchi
OBJECTIVE: To analyze the coatings covering esthetic orthodontic wires and the influence of such coatings on bending and frictional properties. MATERIALS AND METHODS: Four commercially available, coated esthetic archwires were evaluated for their cross-sectional dimensions, surface roughness (Ra), nanomechanical properties (nanohardness, nanoelastic modulus), three-point bending, and static frictional force. Matched, noncoated control wires were also assessed. RESULTS: One of the coated wires had a similar inner core dimension and elasticity compared to the noncoated control wire, and no significant differences between their static frictional forces were observed...
October 12, 2016: Angle Orthodontist
Xuhong Qu, Zhijian Liu, Yunlong Wang, Yi Fang, Mingyuan Du, Hong He
OBJECTIVE: To identify dentofacial anatomic traits associated with lower incisor cancellous bone thickness (LICBT) and then to assess their separate contributions and their combined contributions to the variation in LICBT. MATERIALS AND METHODS: A consecutive sample of cone beam computed tomography (CBCT) data taken in a university hospital within the same setting was retrospectively reviewed. Within the sample, CBCT data of 252 eligible subjects were reconstructed and measured for LICBT, facial traits, and mandibular symphyseal traits...
October 10, 2016: Angle Orthodontist
Xiaolong Li, Qing Zhao, Rui Zhao, Meiya Gao, Xiaolei Gao, Wenli Lai
OBJECTIVE: To evaluate the effect of occlusal plane control on the hyoid bone position and pharyngeal airway of hyperdivergent skeletal Class II patients during orthodontic treatment. MATERIALS AND METHODS: Cephalograms of 47 hyperdivergent skeletal Class II subjects with occlusal plane control (OPC), and another 50 subjects without occlusal plane control (NOPC) were selected to compare the effects of the occlusal plane control procedure. Lateral cephalograms before treatment (T1), immediately after treatment (T2), and an average of 12 months after treatment (T3) were obtained, and 17 measurements were analyzed in each group and compared between groups...
October 7, 2016: Angle Orthodontist
Lishu Feng, Yimei Zhang, Xiaoxing Kou, Ruili Yang, Dawei Liu, Xuedong Wang, Yang Song, Haifeng Cao, Danqing He, Yehua Gan, Yanheng Zhou
OBJECTIVE: To examine the role of cadherin-11, an integral membrane adhesion molecule, in periodontal ligament cells (PDLCs) under mechanical stimulation. MATERIALS AND METHODS: Human PDLCs were cultured and subjected to mechanical stress. Cadherin-11 expression and cell morphology of PDLCs were investigated via immunofluorescence staining. The mRNA and protein expressions of cadherin-11 and type I collagen (Col-I) of PDLCs were evaluated by quantitative real-time polymerase chain reaction and Western blot, respectively...
September 30, 2016: Angle Orthodontist
Mariana Roennau Lemos Rinaldi, Eduardo Martinelli de Lima, Luciane Macedo de Menezes, Susana Maria Deon Rizzatto, Paulo Ricardo Baccarin Matje, Roberto Vanin Pinto Ribeiro
OBJECTIVE: To evaluate and compare the eruption rates of lower second premolars (LPm2) at different developmental stages using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: Retrospectively, 31 individuals (9.77 ± 1.25 years) had their LPm2 scored according to the Demirjian method, and afterwards they were split into three groups according to developmental stage, as follows: D = complete-formed crowns; E = root length less than crown height; and F = root length greater than or equal to crown height...
September 29, 2016: Angle Orthodontist
Yanhua Xu, Jiye Xie
OBJECTIVE: To compare the treatment effects of mini-implants as anchor units with conventional methods of anchorage reinforcement in maxillary dentoalveolar protrusion patients in terms of skeletal, dental, and soft tissue changes. MATERIALS AND METHODS: We searched the databases of the Cochrane Library, PubMed, OVIDSP, CBM, VIP, WanFang Data, and CNKI covering December 1966 to March 2016 for randomized controlled trials (RCTs) and clinical controlled trials that compared the treatment effects of mini-implants with conventional anchorage reinforcement in maxillary dentoalveolar protrusion patients...
September 29, 2016: Angle Orthodontist
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