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Angle Orthodontist

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https://read.qxmd.com/read/30945933/in-vitro-cytotoxicity-of-different-thermoplastic-materials-for-clear-aligners
#1
Stefano Martina, Roberto Rongo, Rosaria Bucci, Armando Viviano Razionale, Rosa Valletta, Vincenzo D'Antò
OBJECTIVES: To investigate the in vitro cytotoxicity of different thermoplastic materials for clear aligners on human primary gingival fibroblasts (HGFs). MATERIALS AND METHODS: Four materials for clear aligners were considered in this study: Duran (Scheu-Dental GmbH, Iserlohn, Germany), Biolon (Dreve Dentamid GmbH, Unna, Germany), Zendura (Bay Materials LLC, Fremont, CA, USA), and SmartTrack (Align Technology, San Jose, CA, USA). Three out of four materials (Duran, Biolon, Zendura) were assessed as thermoformed and nonthermoformed, whereas the SmartTrack was assessed only as thermoformed...
April 4, 2019: Angle Orthodontist
https://read.qxmd.com/read/30942607/effects-of-rapid-maxillary-expansion-on-upper-airway-volume-a-three-dimensional-cone-beam-computed-tomography-study
#2
Yousef Abdalla, Louise Brown, Liselotte Sonnesen
OBJECTIVE: To compare changes in pharyngeal airway volume and minimal cross-sectional area (MCA) between patients undergoing rapid maxillary expansion (RME) and a matched control group and to identify markers for predicting airway changes using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: Pre- and posttreatment CBCT scans were selected of children who had RME (14 girls and 12 boys; mean age, 12.4 years) along with scans of a control group (matched for chronological age, skeletal age, gender, mandibular inclination) who underwent orthodontic treatment for minor malocclusions without RME...
April 3, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920875/comparison-of-achieved-and-predicted-tooth-movement-of-maxillary-first-molars-and-central-incisors-first-premolar-extraction-treatment-with-invisalign
#3
Fan-Fan Dai, Tian-Min Xu, Guang Shu
OBJECTIVES: To compare achieved and predicted tooth movements of maxillary first molars and central incisors in first premolar extraction cases treated with Invisalign. MATERIALS AND METHODS: The present study included 30 patients who received maxillary first premolar extraction treatment with Invisalign. The actual posttreatment model was registered with the pretreatment model on the palatal stable region and superimposed with the virtual posttreatment model. Achieved and predicted tooth movements of maxillary first molars and central incisors were compared using paired t-test...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920874/efficacy-of-injectable-platelet-rich-plasma-in-reducing-alveolar-bone-resorption-following-rapid-maxillary-expansion-a-cone-beam-computed-tomography-assessment-in-a-randomized-split-mouth-controlled-trial
#4
Eyad B Alomari, Kinda Sultan
OBJECTIVES: To evaluate the effectiveness of platelet-rich plasma (PRP) with its growth factors in minimizing the side effects of rapid maxillary expansion (RME) on the periodontal tissue of anchoring teeth using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: A randomized, split-mouth clinical trial was conducted on 18 patients aged 12-16 years (14 ± 1.65) with a skeletal maxillary constriction who underwent RME using a Hyrax appliance. The sample was randomly divided into two groups: intervention and control sides...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920873/asymmetric-dental-arch-treatment-with-forsus-fatigue-appliances-long-term-results
#5
Mehmet Akın, Emire Aybuke Erdur, Onur Öztürk
OBJECTIVES: To investigate the treatment efficacy and follow-up stability of the asymmetric Forsus appliance by evaluating longitudinal changes in dental arch asymmetry on digital dental models from 21 patients. MATERIALS AND METHODS: Maxillary and mandibular reference lines were used for measurements of intra-arch asymmetry at pretreatment (T1), posttreatment (T2), and 4.2 years after treatment (T3). Maxillary and mandibular measurements were performed relative to the dental midline and anterior reference line on digital dental models...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920872/a-cross-sectional-cohort-study-of-gingival-crevicular-fluid-biomarkers-in-normal-weight-and-obese-subjects-during-orthodontic-treatment-with-fixed-appliances
#6
Hayder F Saloom, Guy H Carpenter, Martyn T Cobourne
OBJECTIVES: To investigate the effects of obesity on biomarker levels within lower incisor gingival crevicular fluid (GCF) in subjects undergoing routine fixed appliance orthodontic treatment. MATERIALS AND METHODS: This was a cross-sectional clinical cohort study. GCF was collected from normal-weight and obese subjects at completion of alignment at least 1 month after placement of 0.019 × 0.025-inch stainless-steel archwires. The primary outcome was the difference in GCF biomarker levels between groups...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920871/precision-of-the-virtual-occlusal-record
#7
Keyan P Botsford, Michael C Frazier, Ahmed A M Ghoneima, Achint Utreja, Surya S Bhamidipalli, Kelton T Stewart
OBJECTIVES: To evaluate the precision of the virtual occlusal record using the Carestream CS3600 Intraoral Scanner (Carestream Dental, Atlanta, Ga). MATERIALS AND METHODS: A total of 20 participants were recruited for this prospective study using preestablished inclusion/exclusion criteria. A complete intraoral scan and two bite registrations were obtained. The participants were instructed to bite with normal pressure when bite registrations were acquired. Contact locations, size (circumference), and intensity were identified on the maxillary first molars and canines...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920870/force-induced-decline-of-foxm1-in-human-periodontal-ligament-cells-contributes-to-osteoclast-differentiation
#8
Qian Li, Jianyun Zhang, Dawei Liu, Yunan Liu, Yanheng Zhou
OBJECTIVES: To investigate whether Forkhead family transcription factors are responsive to mechanical force and the resulting influence on the osteoclast differentiation mediated by human periodontal ligament cells (PDLCs). MATERIALS AND METHODS: A high-throughput RNA sequencing assay was performed in compressive force-stimulated and control human PDLCs. Alteration of FOXM1, a member of the Forkhead family transcription factors, was further confirmed by Western blotting and quantitative reverse-transcription polymerase chain reaction...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920869/influence-of-clinical-experience-on-accuracy-of-virtual-orthodontic-attachment-bonding-in-comparison-with-the-direct-procedure
#9
Natalice S De Oliveira, Emile Rossouw, Elizabeth M B Lages, Soraia Macari, Henrique Pretti
OBJECTIVES: To compare the accuracy of bonding orthodontic attachments in a digital environment with the direct bonding procedure depending on the level of the orthodontist's clinical experience. MATERIALS AND METHODS: A total of 1120 artificial teeth of 40 identical models (20 solid sets + 20 digital sets) were divided into four groups: (1) direct bonding (experienced clinicians). (2) direct bonding (postgraduate students), (3) virtual bonding (experienced clinicians), and (4) virtual bonding (postgraduate students)...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920868/phototherapy-is-unable-to-exert-beneficial-effects-on-orthodontic-tooth-movement-in-rat-molars
#10
Simone P Friedrichsdorf, Emily Zaniboni, Alyne Simões, Victor E Arana-Chavez, Gladys C Dominguez
OBJECTIVES: To investigate the effects of irradiation lasers and light-emitting diode (LED) light on root resorption in rat molars during orthodontic tooth movement (OTM). MATERIALS AND METHODS: Twenty-one 12-week-old Wistar male rats were divided into three groups: OTM only (control [CG]), OTM and LED irradiation (DG), and OTM and low laser irradiation therapy (LG). The distance between the first and second molars was used to evaluate the amount of tooth movement...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30920867/camouflage-treatment-for-skeletal-class-iii-patient-with-facial-asymmetry-using-customized-bracket-based-on-cad-cam-virtual-orthodontic-system-a-case-report
#11
Ha Na Sha, Sun Young Lim, Sun Mi Kwon, Jung-Yul Cha
When considering camouflage orthodontic treatment for Class III malocclusion with skeletal facial asymmetry, it is crucial to preserve the favorable compensated posterior occlusion. Once the inclination of the compensated occlusion is changed during orthodontic treatment, unstable occlusion, such as crossbite or scissor bite may occur. A 23-year-old female patient had anterior spacing with Class III malocclusion and a mandibular asymmetry. A nonsurgical approach was adopted. The treatment objectives were to establish a Class I molar relationship with compensated inclination of the posterior dentition and to correct the midline deviation...
March 28, 2019: Angle Orthodontist
https://read.qxmd.com/read/30896251/tissue-response-resulting-from-different-force-magnitudes-combined-with-corticotomy-in-rats
#12
Kriangkrai Kraiwattanapong, Bancha Samruajbenjakun
OBJECTIVES: To evaluate the amount of hyalinization and root resorption after application of light and heavy forces during corticotomy-assisted tooth movement. MATERIALS AND METHODS: Forty-eight male Wistar rats were used. Eight animals were the control group (day 0). The other 40 animals were randomly divided into two groups using the split-mouth technique: (1) corticotomy combined light force (CLF) and (2) corticotomy combined heavy force (CHF). Nickel-titanium closed coil springs that generated 10 g (light force) and 50 g (heavy force) were used for maxillary first molar movement...
March 21, 2019: Angle Orthodontist
https://read.qxmd.com/read/30896250/assessment-of-respiratory-muscle-strength-and-airflow-before-and-after-microimplant-assisted-rapid-palatal-expansion
#13
Camilla Juliana Storto, Aguinaldo Silva Garcez, Hideo Suzuki, Karla Garcez Cusmanich, Islam Elkenawy, Won Moon, Selly Sayuri Suzuki
OBJECTIVES: To assess alterations in respiratory muscle strength and inspiratory and expiratory peak flow, as well as skeletal and dental changes in patients diagnosed with transverse maxillary deficiency before and after microimplant-assisted rapid maxillary expansion (MARPE). MATERIALS AND METHODS: Twenty patients (13 female and 7 male) were assessed by respiratory tests in three different periods: T0 initial, T1 immediately after expansion, and T2 after 5 months...
March 21, 2019: Angle Orthodontist
https://read.qxmd.com/read/30896249/a-sparse-principal-component-analysis-of-class-iii-malocclusions
#14
Tae-Joo Kang, Soo-Heang Eo, HyungJun Cho, Richard E Donatelli, Shin-Jae Lee
OBJECTIVES: To identify the most characteristic variables out of a large number of anatomic landmark variables on three-dimensional computed tomography (CT) images. A modified principal component analysis (PCA) was used to identify which anatomic structures would demonstrate the major variabilities that would most characterize the patient. MATERIALS AND METHODS: Data were collected from 217 patients with severe skeletal Class III malocclusions who had undergone orthognathic surgery...
March 21, 2019: Angle Orthodontist
https://read.qxmd.com/read/30888841/forced-eruption-time-for-palatally-impacted-canines-treated-with-and-without-ostectomy-decortication-technique
#15
Donald J Ferguson, Dalal Al Rossais, M Thomas Wilcko, Laith Makki, Roelien Stapelberg
OBJECTIVES: To compare forced-eruption times for palatally impacted canines treated with and without the ostectomy-decortication technique and to assess the influence of palatally impacted canine pretreatment position and angle on forced-eruption time. MATERIALS AND METHODS: The sample was composed of 118 patient-subjects with 151 palatally impacted canines treated with the ostectomy-decortication technique (n = 72) and without (n = 79). The orthopantomogram radiographs (OPGs) were analyzed for palatally impacted canine angle and horizontal and vertical position...
March 19, 2019: Angle Orthodontist
https://read.qxmd.com/read/30888840/accuracy-of-a-smartphone-based-orthodontic-treatment-monitoring-application-a-pilot-study
#16
Heather B Moylan, Caroline K Carrico, Steven J Lindauer, Eser Tüfekçi
OBJECTIVES: To investigate the reliability and accuracy of a monitoring system in patients undergoing orthodontic treatment with a rapid maxillary expander. Specifically, the amount of tooth movement calculated by the software was compared with the actual measurements taken on plaster models obtained during an in-office visit. MATERIALS AND METHODS: Patients took intraoral video scans using the monitoring software's smartphone application (Dental Monitoring, Paris, France), immediately followed by impressions for plaster models...
March 19, 2019: Angle Orthodontist
https://read.qxmd.com/read/30883188/predictive-values-of-resonance-frequency-analysis-as-a-diagnostic-tool-in-palatal-implant-loss
#17
Katja Wieczorek, Winfried Harzer, Heinrich Wehrbein, Maximilian Moergel, Martin Kunkel, Britta A Jung
OBJECTIVES: To determine the diagnostic value of resonance frequency analysis (RFA) in predicting palatal implant (PI) loss. MATERIALS AND METHODS: RFA values of 32 patients (study center at Mainz and Dresden) were evaluated in a prospective randomized controlled trial addressing clinical performance of two loading concepts on PI (Orthosystem, Straumann, Basel, Switzerland). Group 1: conventional loading after a 12-week healing period vs group 2: immediate loading within one week after insertion...
March 18, 2019: Angle Orthodontist
https://read.qxmd.com/read/30883187/reliability-of-3d-dental-and-skeletal-landmarks-on-cbct-images
#18
Joorok Park, Sheldon Baumrind, Sean Curry, Sean K Carlson, Robert L Boyd, Heesoo Oh
OBJECTIVES: To quantify reliability of three-dimensional skeletal landmarks and a comprehensive set of dental landmarks in cone-beam computed tomography (CBCT) and to determine the shapes of envelope of error. MATERIALS AND METHODS: Three judges located 31 skeletal landmarks and 60 dental landmarks on the pre- and posttreatment CBCT images of 22 patients. Landmark error was determined by calculating the distance of deviation of landmark locations around their average...
March 18, 2019: Angle Orthodontist
https://read.qxmd.com/read/30860863/class-ii-treatment-by-palatal-miniscrew-system-appliance-a-case-report
#19
Luca Lombardo, Giulia Occhiuto, Emanuele Paoletto, Bortolo Giuliano Maino, Giuseppe Siciliani
This case shows that using a rapid palatal expander (RPE) and then a pendulum appliance anchored to palatal miniscrews is an option for improving treatment management in a noncompliant patient requiring maxillary expansion and molar distalization in the late mixed dentition. First, an RPE was used to expand the maxillary arch. Then, a modified pendulum appliance was used to distalize the maxillary first permanent molars. Optimal positioning of two palatal miniscrews enabled both appliances to be supported by skeletal anchorage...
March 12, 2019: Angle Orthodontist
https://read.qxmd.com/read/30855184/root-proximity-of-miniscrews-at-a-variety-of-maxillary-and-mandibular-buccal-sites-reliability-of-panoramic-radiography
#20
Jae-Hwa An, Yong-Il Kim, Seong-Sik Kim, Soo-Byung Park, Woo-Sung Son, Sung-Hun Kim
OBJECTIVES: To assess the root proximity and the insertion angles of miniscrews after miniscrew placement at a variety of maxillary and mandibular buccal sites using cone-beam computed tomography (CBCT) and to determine the differences in root proximity between CBCT and panoramic radiography (PR). MATERIALS AND METHODS: This retrospective study included 50 patients (mean age, 22.0 ± 4.5 years) who underwent postoperative CBCT and PR after miniscrew placements for intermaxillary fixation in orthognathic surgery...
March 11, 2019: Angle Orthodontist
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