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Angle Orthodontist

Bin Wu, Siyu Zhao, Haotian Shi, Ruxin Lu, Bin Yan, Songyun Ma, Bernd Markert
OBJECTIVES: To determine the viscoelastic properties of the human periodontal ligament (PDL) using dynamic mechanical analysis (DMA). MATERIALS AND METHODS: This study was carried out on three human maxillary jaw segments containing six upper central incisors and four lateral incisors. DMA was used to investigate the mechanical response of the human PDL. Dynamic sinusoidal loading was carried out with an amplitude of 3 N and frequencies between 0.5 Hz and 10 Hz...
January 2, 2019: Angle Orthodontist
Gul Tas Deynek, Sabri Ilhan Ramoglu
OBJECTIVES: To evaluate the effects of the Indium Gallium Arsenide Phosphoride (InGaAsP) diode laser at different energy levels on orthopedically expanded midpalatal sutures of rats. MATERIALS AND METHODS: Eighty Wistar rats were randomly divided into four groups: a control group and low-, moderate-, and high-level laser groups with amounts of energy irradiated at 0 J, 18 J, 42 J, and 60 J, respectively. Each group was divided into two subgroups (n = 10) according to the schedule of sacrifice (7 and 21 days)...
January 2, 2019: Angle Orthodontist
Hao Liu, Yiping Huang, Yingying Zhang, Yineng Han, Yixin Zhang, Lingfei Jia, Yunfei Zheng, Weiran Li
OBJECTIVES: To investigate the long noncoding RNA (lncRNA) expression profile of cementoblasts under compressive force. MATERIALS AND METHODS: Mouse cementoblasts were exposed to compression (1.5 g/cm2 ) for 8 hours. RNA sequencing (RNA-seq) was performed to compare the transcriptomes of the compressed and control cells. Quantitative real-time polymerase chain reaction (qRT-PCR) was used to validate five of the differentially expressed lncRNAs of interest. Gene Ontology (GO) functional annotation and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were also performed...
January 2, 2019: Angle Orthodontist
Anil Ardeshna, Frank Bogdan, Shuying Jiang
OBJECTIVES: To evaluate skeletal and dentoalveolar changes produced by the Mandibular Anterior Repostioning Appliance (MARA) in the treatment of Class II malocclusion in adolescent patients. MATERIALS AND METHODS: Lateral cephalograms of 24 patients, mean age 12.40 years, with a Class II malocclusion consecutively treated with MARA were compared with a historical control group. Changes were evaluated using the Pancherz superimposition and grid analysis pre- and posttreatment...
January 2, 2019: Angle Orthodontist
Andrew C Grillo, Ahmed A M Ghoneima, Lawrence P Garetto, Surya S Bhamidipalli, Kelton T Stewart
OBJECTIVE: To evaluate the association between resident selection criteria, including Graduate Record Examination (GRE) scores, and student performance in an orthodontic residency program. MATERIALS AND METHODS: This retrospective study evaluated the academic records of 70 orthodontic residency graduates from the Indiana University School of Dentistry. The following demographic and scholastic data were extracted from the student academic records: applicant age, gender, ethnicity, race, country of origin, dental school graduation year, GRE score, and graduate orthodontic grade point average (GPA)...
January 2, 2019: Angle Orthodontist
Emily Wible, Manika Agarwal, Sibel Altun, Tyler Ramir, Grace Viana, Carla Evans, Henry Lukic, Spiro Megremis, Phimon Atsawasuwan
OBJECTIVES: To evaluate long-term light transmittance, surface roughness, and flexural modulus of polypropylene/ethylene copolymer retainer material after exposure to different cleaning methods. MATERIALS AND METHODS: Standardized polypropylene/ethylene copolymer retainer specimens (n = 70, 50.8 mm × 12.7 mm × 1.0 mm) were subjected to seven chemical cleaning solutions: Invisalign cleaning crystals, Retainer Brite, Polident, Listerine mouthwash, 2.5% acetic acid, 0...
January 2, 2019: Angle Orthodontist
Sherif A Elkordy, Amr M Abouelezz, Mona M S Fayed, Mai H Aboulfotouh, Yehya A Mostafa
OBJECTIVES: To evaluate the use of direct miniplate anchorage in conjunction with the Forsus Fatigue Resistant Device (FFRD) in treatment of skeletal Class II malocclusion. MATERIALS AND METHODS: Forty-eight females with skeletal Class II were randomly allocated to the Forsus plus miniplates (FMP) group (16 patients, age 12.5 ± 0.9 years), Forsus alone (FFRD; 16 patients, age 12.1 ± 0.9 years), or the untreated control group (16 subjects, age 12.1 ± 0.9 years)...
December 28, 2018: Angle Orthodontist
Lucas Cardinal, Inês Martins, Bruno Frazão Gribel, Gladys Cristina Dominguez
OBJECTIVES: To evaluate if there is a true skeletal asymmetry of the condylar and coronoid processes of the mandible in growing individuals with unilateral posterior crossbite (UPC) either functional or not. MATERIALS AND METHODS: This cross-sectional study screened a total of 1120 cone beam computed tomography (CBCT) scans based on inclusion and exclusion criteria. The final sample comprised 20 CBCT images of individuals with UPC and 19 CBCT images of individuals without transverse malocclusion...
December 28, 2018: Angle Orthodontist
Fatih Celebi, Ahmet Altun, Ali Altug Bicakci
OBJECTIVES: To investigate the potential cytotoxicity of the bracket identification dyes commonly used in orthodontic fixed appliances. MATERIALS AND METHODS: Six bracket brands representing the market in various aspects were selected. Ten sets of each bracket brand were acquired, and the identification dyes on them were scraped. They were tested for cytotoxicity at three different levels of concentration (2.5 mg/mL, 5 mg/mL, and 10 mg/mL), with the aid of a real-time cell analysis system...
December 28, 2018: Angle Orthodontist
Ahmed Mohamed Alakttash, Mohamed Fawzi, David Bearn
OBJECTIVES: To investigate whether adhesive precoated brackets (APC) are more efficient than operator-coated brackets (OPC) regarding failure rate, bonding time, patient experience, gingival health, plaque accumulation, and white spot lesion formation. MATERIALS AND METHODS: Five online databases: Cochrane Central Register of Controlled Trials (CENTRAL), Scopus, PubMed, MEDLINE, and Web of Science were searched for potential eligible randomized controlled trials (RCTs)...
December 17, 2018: Angle Orthodontist
Peter H Buschang, David Chastain, Cameron L Keylor, Doug Crosby, Katie C Julien
OBJECTIVES: To compare the incidence of white spot lesions (WSLs) among patients treated with aligners and those treated with traditional braces. MATERIALS AND METHODS: A group of 244 aligner patients (30.4 ± 14 years) was compared to a group of 206 patients (29.2 ± 11.5 years) treated with traditional fixed braces. Consecutive cases in the late mixed or permanent dentitions who had high-quality pre- and posttreatment digital photographs available were included in the study...
December 17, 2018: Angle Orthodontist
Hyo-Jin Park, Sung-Hwan Choi, Yoon Jeong Choi, Young-Bum Park, Kwang-Mahn Kim, Hyung-Seog Yu
OBJECTIVES: To determine whether the success rate and primary stability of surface-treated miniscrews differ from those of nontreated miniscrews. MATERIALS AND METHODS: Patients who required one or more miniscrews for the same reason in each quadrant were recruited into a single-blinded, split-mouth, randomized, controlled trial with a 1:1 allocation ratio. Self-drilling miniscrews with two surface types were used: those with no surface treatment, and those with an acid-etched surface treatment...
December 5, 2018: Angle Orthodontist
Jae-Hee Yang, Bong-Kuen Cha, Dong-Soon Choi, Jae Hyun Park, Insan Jang
OBJECTIVES: To investigate the time and pattern of fusion of the spheno-occipital synchondrosis in patients with skeletal Class I and Class III malocclusion using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: A total of 262 CBCT images were collected: 140 skeletal Class I (0° < ANB < 4°; 71 males, 69 females) and 122 skeletal Class III (ANB ≤ 0°; 61 males and 61 females). The fusion stages were identified using CBCT images of a six-stage system defined by the appearance of osseous cores and ossifying vestige in the synchondrosis...
December 5, 2018: Angle Orthodontist
Kinan G Zeno, Samah J El-Mohtar, Samir Mustapha, Joseph G Ghafari
OBJECTIVE: To evaluate stresses on maxillary teeth during alignment of a palatally impacted canine (PIC) under different loading conditions with forces applied in vertical and buccal directions. MATERIALS AND METHODS: A three-dimensional finite element model of the maxilla was developed from a cone beam computed tomographic scan of a patient with a left PIC. Traction was simulated under different setups: (1) palatal spring extending from a transpalatal bar (TPB) anchored on the first molars (M1) and alternatively combined with different archwires (0...
December 5, 2018: Angle Orthodontist
Mike C Ross, Phillip M Campbell, Larry P Tadlock, Reginald W Taylor, Peter H Buschang
OBJECTIVE: To determine whether automated text messages sent daily to adolescent orthodontic patients improves oral hygiene more than weekly reminders. MATERIALS AND METHODS: A blinded, prospective, randomized controlled trial was designed to evaluate the effects of automated messages on oral hygiene. Subjects were recruited from patients undergoing orthodontic treatment at the Texas A&M University College of Dentistry, Department of Orthodontics. They were being treated with a variety of fixed full appliances in both arches...
December 5, 2018: Angle Orthodontist
Do-Keun Kim, Joohon Sung, Yun-Mi Song, Eung-Min Kim, Young Ho Kim, Seung-Hak Baek
OBJECTIVES: To investigate the difference in heritability of craniofacial skeletal and dental characteristics between hypodivergent and hyperdivergent patterns. MATERIALS AND METHODS: 53 Korean adult monozygotic (MZ) and dizygotic (DZ) twins and their siblings were divided into a hypodivergent group (Group 1, SN-MP < 35°, 17 MZ pairs; 11 DZ and sibling [DS] pairs of the same gender) and hyper-divergent group (Group 2, SN-MP > 35°, 16 MZ pairs; 9 DS pairs of the same gender)...
December 5, 2018: Angle Orthodontist
Christina Erbe, Collin Jacobs, Malgorzata Klukowska, Hans Timm, Julie Grender, Heinrich Wehrbein
OBJECTIVE: To compare the plaque removal efficacy of an oscillating-rotating electric toothbrush with an orthodontic brush head versus a sonic toothbrush in adolescent patients with fixed orthodontic appliances. MATERIALS AND METHODS: This was a randomized, examiner-blind, replicate single-use, two-treatment, four-period, crossover study with a washout period between visits of approximately 24 hours. Forty-four adolescent patients with fixed orthodontic appliances in both arches were randomized based on a computer-generated randomization schedule to one of four toothbrush treatment sequences...
December 5, 2018: Angle Orthodontist
Christina Erbe, Malgorzata Klukowska, Hans C Timm, Matthew L Barker, Janneke van der Wielen, Heinrich Wehrbein
OBJECTIVES: To assess plaque and gingivitis reduction in orthodontic patients after 4 weeks' use of an oscillating-rotating power brush, irrigator, and mouthrinse. MATERIALS AND METHODS: This was a randomized, examiner-blind, clinical trial comparing plaque and gingivitis outcomes for an experimental power brush/irrigator/mouthrinse oral hygiene routine vs a dental prophylaxis followed by regular manual brushing (positive control). Fifty-one participants with fixed orthodontic appliances in the upper and lower jaw and a minimum of 15 gingival bleeding sites were randomly assigned to experimental or positive control treatment...
December 5, 2018: Angle Orthodontist
Yichen Pan, Si Chen
OBJECTIVES: To explore risk factors for contact between the incisive canal (IC) and upper central incisors (U1) and to evaluate the relationship between contact and root resorption using cone-beam computer tomography (CBCT). MATERIALS AND METHODS: This retrospective study used CBCT data of 33 patients treated by a senior orthodontist. Anterior teeth were retracted with mini-implants, and CBCT scans were taken before and after retraction. IC height and width, U1 lingual movement, and U1-IC distance and root length decrease were compared between contact and noncontact groups...
November 28, 2018: Angle Orthodontist
Yixin Zhang, Zhen Fu, Haichao Jia, Yiping Huang, Xiaobei Li, Hao Liu, Weiran Li
OBJECTIVES: This study evaluated the long-term stability of maxillary protraction (MP) in patients with complete unilateral cleft lip and palate (UCLP) and identified factors influencing relapse and long-term outcomes. MATERIALS AND METHODS: Twenty-three adolescents with UCLP who underwent MP therapy were recalled when craniofacial growth was close to completion. Subjects exhibiting reverse/positive overjets were assigned to unstable/stable groups. Lateral cephalometric measurements were made before treatment (T0), after active treatment (T1), and at the end of the growth spurt (T2)...
November 28, 2018: Angle Orthodontist
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