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Angle Orthodontist

Omar T Said, P Emile Rossouw, Leonard S Fishman, Changyong Feng
OBJECTIVE: To determine the relationship between anterior occlusion and frontal sinus size. METHODS: The patient database at the Eastman Institute for Oral Health, University of Rochester, was searched for male patients older than 15 years and females older than 13 years of age. After applying inclusion and exclusion criteria, participants' photos and lateral cephalometric and posteroanterior radiographs were examined then classified into a control class I group (n = 20, 15...
June 16, 2017: Angle Orthodontist
Riccardo Nucera, Antonino Lo Giudice, Angela Mirea Bellocchio, Paola Spinuzza, Alberto Caprioglio, Letizia Perillo, Giovanni Matarese, Giancarlo Cordasco
OBJECTIVE: To analyze the buccal bone thickness, bone depth, and cortical bone depth of the mandibular buccal shelf (MBS) to determine the most suitable sites of the MBS for mini-screw insertion. MATERIALS AND METHODS: The sample included cone-beam computed tomographic (CBCT) records of 30 adult subjects (mean age 30.9 ± 7.0 years) evaluated retrospectively. All CBCT examinations were performed with the i-CAT CBCT scanner. Each exam was converted into DICOM format and processed with OsiriX Medical Imaging software...
June 9, 2017: Angle Orthodontist
Zachary Librizzi, Zana Kalajzic, Daniel Camacho, Sumit Yadav, Ravindra Nanda, Flavio Uribe
OBJECTIVE: To evaluate the effect of corticotomy and corticision, with and without a full mucoperiosteal flap, on the rate of tooth movement and alveolar response in a rat model. MATERIALS AND METHODS: Sixty male, 6-week-old Wistar rats were divided into five groups based on surgical procedure, as follows: control (no tooth movement), orthodontic tooth movement (OTM) only, corticotomy, corticision, and corticision with full mucoperiosteal flap (corticision + flap)...
June 8, 2017: Angle Orthodontist
Fabian Jäger, James K Mah, Axel Bumann
OBJECTIVE: To quantify treatment-related changes in peridental bone height and thickness in orthodontic patients. MATERIALS AND METHODS: Cone-beam computed tomographs (CBCTs) of 43 patients (24 female, 19 male; mean age: 25 years, 5 months) who underwent orthodontic treatment with multibracket appliances for at least 1 year were chosen for retrospective evaluation. Dehiscence depth and changes in bone width and tooth inclination were determined for 954 teeth. RESULTS: There was a significant decrease in peridental bone height (dehiscence; -0...
May 29, 2017: Angle Orthodontist
Min-Hee Oh, Hyeon-Shik Hwang, Kyung-Min Lee, Jin-Hyoung Cho
OBJECTIVE: To compare the condylar displacement following sagittal split ramus osteotomy (SSRO) in asymmetric setback patients between the conventional approach and surgery-first approach and to determine whether the condylar displacement is affected by asymmetric setback in SSRO patients. MATERIALS AND METHODS: This was a retrospective study. The subjects consisted of patients with facial asymmetry who underwent SSRO and had cone-beam computed tomography taken before and 1 month after surgery...
May 22, 2017: Angle Orthodontist
Andrea Wichelhaus
OBJECTIVE: To biomechanically test a new elastic slot system and V-wire mechanics. MATERIALS AND METHODS: Conventional twin and self-ligating brackets and the new elastodynamic bracket were biomechanically tested. The conventional brackets had a rectangular 0.022'' slot and the new elastodynamic bracket had a V-slot, a new slot geometry. Torque measurements were performed with 0.018'' × 0.025'' and 0.019'' × 0.025'' stainless steel (ss) archwires. A nickel-titanium V wire was used for the biomechanical measurements on the elastodynamic bracket...
May 22, 2017: Angle Orthodontist
Wookang Yoon, Soonshin Hwang, Chooryung Chung, Kyung-Ho Kim
OBJECTIVE: To determine the effects of extraction and the number of teeth extracted on changes in occlusal function by measuring occlusal contact area and force before and after orthodontic treatment with a fixed appliance. MATERIALS AND METHODS: Female patients treated with a fixed appliance were divided into nonextraction (n = 36), two maxillary premolar extraction (n = 31), and four premolar extraction (n = 18) groups. Bite pressure-sensitive films were used to analyze the occlusal contact area and force...
May 9, 2017: Angle Orthodontist
Bhavendrasinh Sayania, Mehreen Merchant, Philip Josephs, Chun-Hsi Chung
OBJECTIVES: To assess longitudinal changes in the buccolingual inclination of the maxillary and mandibular first molars in untreated male and female subjects. MATERIALS AND METHODS: Forty-seven male and 48 female subjects whose longitudinal dental casts were available at ages 6-16 years, with normal maxillary and mandibular arch forms were included. The original casts at ages 6, 7, 8, 9, 10, 12, 14, and 16 years were digitized and standardized. Measurements were recorded as the differences in cusp heights in the vertical dimension for the mandibular and maxillary first molars using OrthoInsight software...
May 8, 2017: Angle Orthodontist
Sara M Wilson, Wen Lien, David P Lee, William J Dunn
OBJECTIVE: To see whether there is an advantage to using a self-limiting phosphoric acid etchant versus a traditional 34% phosphoric acid etchant for bonding by measuring the depth of etch at multiple time intervals. MATERIALS AND METHODS: A total of 25 bovine teeth were mounted and etched on the facial surface with two different etchants: standard 34% phosphoric acid and a self-limiting 35% phosphoric acid etchant at varied time intervals of 15, 30, 60, 90, and 120 seconds...
May 8, 2017: Angle Orthodontist
Tamizhmani Jayachandran, Bhadrinath Srinivasan, Sridevi Padmanabhan
OBJECTIVES: To assess and compare the concentration of leptin in saliva between normal weight and overweight individuals and to evaluate the rate of orthodontic tooth movement. MATERIALS AND METHODS: Thirty female subjects were divided into two groups: I (normal weight) and II (overweight group) based on their body mass index. All subjects underwent fixed appliance therapy requiring upper first premolar extraction and distal movement of the canine. Distal force was applied to the maxillary right canine using active lacebacks...
May 4, 2017: Angle Orthodontist
Soonshin Hwang, Yoon Jeong Choi, Ji Yeon Lee, Chooryung Chung, Kyung-Ho Kim
OBJECTIVE: The purpose of this study was to investigate the diagnostic aspects, contributing conditions, and predictive key factors associated with ectopic eruption of maxillary second molars. MATERIAL AND METHODS: This retrospective study evaluated the study models, lateral cephalographs, and panoramic radiographs of 40 adult subjects (20 men, 20 women) with bilateral ectopic eruption and 40 subjects (20 men, 20 women) with normal eruption of the maxillary second molars...
May 3, 2017: Angle Orthodontist
Yuki Kasahara, Risa Usumi-Fujita, Jun Hosomichi, Sawa Kaneko, Yuji Ishida, Naoki Shibutani, Yasuhiro Shimizu, Asuka Okito, Shuji Oishi, Yoichiro Kuma, Hiroyuki Yamaguchi, Takashi Ono
OBJECTIVE: To clarify whether low-intensity pulsed ultrasound (LIPUS) exposure has recovery effects on the hypofunctional periodontal ligament (PDL) and interradicular alveolar bone (IRAB). MATERIALS AND METHODS: Twelve-week-old male Sprague-Dawley rats were divided into three groups (n = 5 each): a normal occlusion (C) group, an occlusal hypofunction (H) group, and an occlusal hypofunction group subjected to LIPUS (HL) treatment. Hypofunctional occlusion of the maxillary first molar (M1) of the H and HL groups was induced by the bite-raising technique...
May 2, 2017: Angle Orthodontist
Christian Andreas Dietrich, Andreas Ender, Stefan Baumgartner, Albert Mehl
OBJECTIVE: To determine the accuracy (trueness and precision) of two different rapid prototyping (RP) techniques for the physical reproduction of three-dimensional (3D) digital orthodontic study casts, a comparative assessment using two 3D STL files of two different maxillary dentitions (two cases) as a reference was accomplished. MATERIALS AND METHODS: Five RP replicas per case were fabricated using both stereolithography (SLA) and the PolyJet system. The 20 reproduced casts were digitized with a highly accurate reference scanner, and surface superimpositions were performed...
May 1, 2017: Angle Orthodontist
Ramzi V Haddad, Joseph G Ghafari
OBJECTIVES: To determine if a new facial line (T), tangent to the throat, intersects the mandibular border in anterior (ANT) and posterior (POST) parts in proportions varying with facial configuration, and to evaluate the association between chin projection and throat inclination and the potential for the T-line to reflect this association. MATERIALS AND METHODS: Measurements on profile photographs and cephalograms of 135 adults (aged 18-50 years)-45 each of Class I, II, and III (CI, CII, CIII) malocclusions-included ANT and POST, chin-throat (CTA), and mento-cervical (MCA) angles...
May 1, 2017: Angle Orthodontist
Jianru Yi, Jiani Xiao, Yu Li, Xiaobing Li, Zhihe Zhao
OBJECTIVES: The aim of this systematic review was to evaluate the effect of piezocision as an adjunctive procedure to accelerate orthodontic tooth movement. MATERIALS AND METHODS: Randomized controlled trials and controlled clinical trials that investigated the effectiveness of piezocision on accelerating orthodontic tooth movement were identified through electronic and manual searches. The literature search, study inclusion, risk of bias assessment, and data extraction were performed by two reviewers independently...
April 21, 2017: Angle Orthodontist
Ying-Ying Zhang, Yi-Ping Huang, Hua-Xiang Zhao, Ting Zhang, Feng Chen, Yan Liu
OBJECTIVE: To investigate whether Piezo1, a mechanotransduction gene mediates the cementogenic activity of cementoblasts under a static mechanical compressive force. MATERIALS AND METHODS: Murine cementoblasts (OCCM-30) were exposed to a 2.0 g/cm(2) static compressive force for 3, 6, 12, and 24 hours. Then the expression profile of Piezo1 and the cementogenic activity markers osteoprotegerin (Opg), osteopontin (Opn), osteocalcin (Oc), and protein tyrosine phosphataselike member A (Ptpla) were analyzed...
April 18, 2017: Angle Orthodontist
Xi Wen, Xiyu Wang, Shuqi Qin, Lorenzo Franchi, Yan Gu
OBJECTIVE: To compare the three-dimensional (3D) morphology of the upper airway in skeletal Class III patients with and without mandibular asymmetry and to investigate the possible underlying correlations between the morphology of the upper airway and mandibular deviation. MATERIALS AND METHODS: Cone-beam computed tomography images of 54 subjects with skeletal Class III malocclusion (ANB angle ≤ 0.4°, Wits ≤ -5.5°) were taken and 3D upper airway models were reconstructed using Dolphin 3D software...
April 18, 2017: Angle Orthodontist
Selin Ozbilek, Ahmet Yalcin Gungor, Salih Celik
OBJECTIVE: To evaluate the skeletal, dentoalveolar, and soft tissue effects of skeletally anchored Class II elastics and compare them with a matched control group treated by a monobloc appliance for the correction of skeletal Class II malocclusion due to mandibular retrusion. MATERIALS AND METHODS: Twelve patients (6 girls, 6 boys) were randomly divided into two groups. In the elastics group, six patients (12.9 ± 1.5 years of age; 3 boys, 3 girls) were treated with skeletally anchored Class II elastics...
April 12, 2017: Angle Orthodontist
Rola Alkhatib, Chun-Hsi Chung
OBJECTIVE: To evaluate the buccolingual inclinations of maxillary and mandibular first molars in untreated adults. MATERIALS AND METHODS: Fifty-nine subjects (14 males and 45 females; mean age, 41.2 years) with no missing teeth, no crossbite, and minimal crowding were included. For each subject, a CBCT was taken. The long axis of each first molar was determined, and the inclination of each molar was measured using the long axis and the floor. RESULTS: One hundred seventeen out of 118 mandibular first molars measured had a lingual inclination, with a mean of 12...
April 4, 2017: Angle Orthodontist
Birte Melsen
No abstract text is available yet for this article.
May 2017: Angle Orthodontist
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