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E Erin Bilbo, Steven D Marshall, Karin A Southard, Verrasathpurush Allareddy, Nathan Holton, Allyn M Thames, Marlene S Otsby, Thomas E Southard
OBJECTIVES: The long-term skeletal effects of Class II treatment in growing individuals using high-pull facebow headgear and fixed edgewise appliances have not been reported. The purpose of this study was to evaluate the long-term skeletal effects of treatment using high-pull headgear followed by fixed orthodontic appliances compared to an untreated control group. MATERIALS AND METHODS: Changes in anteroposterior and vertical cephalometric measurements of 42 Class II subjects (n = 21, mean age = 10...
April 18, 2018: Angle Orthodontist
Yu Hikita, Tetsutaro Yamaguchi, Daisuke Tomita, Mohamed Adel, Takatoshi Nakawaki, Koshu Katayama, Koutaro Maki, Ryosuke Kimura
OBJECTIVES: To examine the relationship between tooth length and growth hormone receptor (GHR) gene variants in a healthy Japanese population. MATERIALS AND METHODS: The subjects consisted of 193 Japanese adults (69 men, 124 women), aged 13 to 56 years. Genomic DNA was extracted from saliva and genotyped GHR rs6184 and rs6180 variants using the Taqman genotyping. Computed tomography (CT) images were acquired using a dental cone-beam CT scanner and reconstructed using open-source OsiriX medical image processing software...
April 18, 2018: Angle Orthodontist
Yuan Xu, Yuhuan Jia, Liang Chen, Wenming Huang, Deqin Yang
BACKGROUND: The mixed dentition is an important transition period from primary teeth. to permanent teeth. However, the caries prevalence of first permanent molar in mixed dentitions was about 30%, which almost represent the caries rate of permanent teeth in this period of time. Therefore, we assessed the oral bacterial profiles in young children (age 6-8) with mixed dentition with or without first molar caries for providing the research basis of caries etiology. METHODS: We collected samples of supragingival plaque and saliva from the children living in Guizhou, a rural isolated province in China...
April 18, 2018: Oral Diseases
Matthew V Emery, Robert J Stark, Tyler J Murchie, Spencer Elford, Henry P Schwarcz, Tracy L Prowse
OBJECTIVES: We obtained the oxygen and strontium isotope composition of teeth from Roman period (1st to 4th century CE) inhabitants buried in the Vagnari cemetery (Southern Italy), and present the first strontium isotope variation map of the Italian peninsula using previously published data sets and new strontium data. We test the hypothesis that the Vagnari population was predominantly composed of local individuals, instead of migrants originating from abroad. MATERIALS AND METHODS: We analyzed the oxygen (18 O/16 O) and strontium (87 Sr/86 Sr) isotope composition of 43 teeth...
April 18, 2018: American Journal of Physical Anthropology
Denise M Imai, Risa Pesapane, Christopher J Conroy, Christina N Alarcón, Nora Allan, Russell A Okino, Jennifer Fung, Brian G Murphy, Frank J M Verstraete, Janet E Foley
Molar apical elongation (MAE) was the leading cause for euthanasia or death in a captive breeding colony of endangered Amargosa voles ( Microtus californicus scirpensis). Clinical signs included ocular discharge, abnormal mastication, dyspnea, abnormal mentation, weight loss, and death. Although the severity varied, all molars in all quadrants were affected. When severe, the overgrown molar reserve crown and apex protruded into the nasal meatuses, the orbit, the calvarial vault and through the ventral margin of the mandible...
January 1, 2018: Veterinary Pathology
Yongqiang Wu, Tiantong Guo, Dehua Shu, Wu Zhang, Fangfei Luan, Ling Shi, Dongcai Guo
Six novel 8-hydroxyquinoline derivatives were synthesized using 2-methyl-8-hydroxyquinoline and para-substituted phenol as the main starting materials, and were characterized by 1 H nuclear magnetic resonance (NMR), mass spectrometry (MS), ultraviolet (UV) light analysis and infra-red (IR) light analysis. Their complexes with Eu(III) were also prepared and characterized by elemental analysis, molar conductivity, UV light analysis, IR light analysis, and thermogravimetric-differential thermal analysis (TG-DTA)...
April 17, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
Stephan Schulz, Julia Krüger, Chelladurai Ganesamoorthy, Lukas John, Christoph Wölper
Reactions of three equivalents of LGa {L = HC[C(Me)N(2,6-i-Pr2C6H3)]2} with SbX3 (X = F, Cl, Br, I) proceed with insertion into the Sb-X bond, elimination of LGaX2 and formation of LGaSbGa(X)L (X = F 1, Cl 2, Br 3, I 4) containing a Ga=Sb double bond. In contrast, the 2:1 molar ratio reaction of LGa and SbCl3 initially gives the twofold insertion product [L(Cl)Ga]2SbCl 7, which could not be isolated due to its strong tendency toward elimination of LGaCl2 and formation of distibene [L(Cl)GaSb]2 5 at 25 °C or cyclotristibine [L(Cl)GaSb]3 6 at 8 °C...
April 17, 2018: Chemistry: a European Journal
Roshan Noor Mohamed, Sakeenabi Basha, Yousef Al-Thomali
OBJECTIVES: To evaluate the quantitative effects of miniscrew supported appliances for maxillary molar distalization in Class II malocclusion. MATERIALS AND METHODS: The systematic search included MEDLINE, EMBASE, CINAHL, PsychINFO, Scopus, and key journals and review articles. The date of the last search was January 30, 2017. Methodological quality of the retrospective studies was graded by means of the Quality Assessment Tool for Quantitative Studies, developed for the Effective Public Health Practice Project (EPHPP) and prospective studies by means of Newcastle-Ottawa Scale...
April 17, 2018: Angle Orthodontist
Yu Hikita, Tetsutaro Yamaguchi, Daisuke Tomita, Mohamed Adel, Takatoshi Nakawaki, Koshu Katayama, Koutaro Maki, Ryosuke Kimura
OBJECTIVES: To clarify the relationship between tooth length and three-dimensional mandibular morphology in a healthy Japanese population. MATERIALS AND METHODS: This study included 181 Japanese adults: 66 men and 115 women. Cone-beam computed tomography (CBCT) images were acquired with a dentofacial cone-beam x-ray CT scanner. Tooth length was measured with open-source OsiriX medical image processing software. Crown height and root length were measured in the maxillary and mandibular central incisors, lateral incisors, canines, first premolars, second premolars, first molars, and second molars...
April 17, 2018: Angle Orthodontist
Sang-Woon Ha, Yu-Jin Jung, Han-Sol Bae, Hyun-Mo Ryoo, Il-Sik Cho, Seung-Hak Baek
OBJECTIVE: To investigate the characteristics of the dental phenotype in patients with cleidocranial dysplasia (CCD) using longitudinal data. MATERIALS AND METHODS: Twelve unrelated Korean CCD patients were observed using a longitudinal series of radiographs and clinical photographs. Statistical analysis was performed on the dental phenotypic data. RESULTS: Although dysplasia of the clavicles, open fontanelle, and wormian bone were observed in all 12 patients, delayed fusion of the mandibular symphysis was found in four patients...
April 17, 2018: Angle Orthodontist
Jiazheng Ren, Alex Chinghuan Lee, Kai Cheng, Ming Li, Yongsheng Chen
Dry reforming of methane converts two greenhouse gases to syngas, and Ni catalysts are commonly used for this reaction. A major catalyst deactivation mechanism is carbon deposition. Although numerous kinetic modelling works have been done on carbon formation, there were only scarce attempts to measure carbon deposition kinetics under relevant (but not real) conditions due to technical difficulties. Here we report first successful measurements of the kinetics under real reaction conditions. This was made possible by a novel algorithm we have developed...
April 17, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Thomas A Püschel, Jordi Marcé-Nogué, Thomas M Kaiser, Robert J Brocklehurst, William I Sellers
Primates are interpreted to be ancestrally adapted to frugivory, although some modern groups show clear adaptations to other diets. Among them, pitheciids stand out for specifically predating seeds. This dietary specialization is known as sclerocarpy and refers to the extraction of seeds from surrounding hard tissues using the anterior dentition followed by the mastication of seeds by the molars. It has been proposed that Callicebus-Pithecia-Chiropotes-Cacajao represent a morphocline of increasingly specialized anatomical traits for sclerocarpic foraging...
April 17, 2018: American Journal of Primatology
Martha Holland, Caroline Carrico, Tiffany Williams
PURPOSE: To assess pediatric dentists' choice for restoring Class II carious lesions in primary molars. METHODS: A survey with eight cases of class II carious lesions was emailed to American Academy of Pediatric Dentistry members, who were asked to choose either a stainless steel crown (SSC) or composite resin as a final restoration, or no treatment. Treatment decisions were compared to evidence-based treatment recommendations. Repeated measures logistic regression was used to determine factors associated with treatment decisions...
January 15, 2018: Journal of Dentistry for Children
Ana Carolina Bosco Mendes, Manuel Restrepo, Elcilaine Rizzato Azevedo, Rita De Cássia Loiola Cordeiro, Lourdes Santos-Pinto, Angela Cristina Cilense Zuanon
PURPOSE: To evaluate the effect of two molar clamps on artificially demineralized enamel of permanent teeth after three periods of isolation. METHODS: Twenty extracted third molars were immersed in a biological solution for development of artificial white spot lesions and then were equally divided into two groups according to the clamp being placed (Group G205: clamp no. 205; Group G26: clamp no. 26). The loss of fluorescence and lesion area of demineralized surface after each isolation were assessed by quantitative light-induced fluorescence...
January 15, 2018: Journal of Dentistry for Children
Aikaterini Koleventi, Dimitra Sakellari, Konstantinos N Arapostathis, Nikolaos Kotsanos
PURPOSE: When treating an early permanent molar with coronal malformation in children, as in severe molar incisor hypomineralization (MIH) cases, preformed metal crowns (PMCs) are a successful mid- to long-term restorative option. The purpose of this study was to evaluate possible changes in periodontal tissues and subgingival microbiota after PMC placement by way of a split-mouth study. METHODS: Fourteen healthy patients with a mean age of 10.6 (±4.2) years old, attending a university dental clinic, had one MIH severely affected permanent first molar restored with a PMC (study side), while the contralateral relatively healthy tooth was the control...
March 15, 2018: Pediatric Dentistry
Lingling Jiang, Yuhua Cao, Xingjiong Ni, Min Zhang, Guangqun Cao
In our previous work, it was found that the vesicles were formed spontaneously by mixing octyltriethylammonium bromide (C8 NE3 Br) with sodium dodecyl benzene sulfonate (SDBS), and the vesicles have been developed as a pseudostationary phase (PSP) in electrokinetic chromatography (EKC). In the present work, the effects of the concentration and the molar ratio of cationic to anionic surfactant on the vesicle properties and the performances of vesicle PSP in EKC -have been investigated. The aggregates at all mixing ratio were negatively charged regardless of which surfactant surplus...
April 16, 2018: Electrophoresis
Mauricio Augusto Aquino de Castro, Sâmila Gonçalves Barra, Manuel Oscar Lagravere Vich, Mauro Henrique Guimaraes Abreu, Ricardo Alves Mesquita
PURPOSE: The mandibular canal must be considered in dental procedures to avoid injuries of the alveolar inferior nerve. The occurrence of anatomical variations of the mandibular canal increases the risk of neurovascular injuries. The purpose of this study was to identify and describe the prevalence of mandibular canal branching (MCB) using cone beam computer tomography (CBCT). METHODS: Seven hundred standardized CBCTs were selected. The images were evaluated for the presence of MCB and for the detection of pathologies that could affect the structure of the canals...
April 16, 2018: La Radiologia Medica
Catalina Fuentes, Joel Castillo, Jose Vila, Lars Nilsson
The use of polymers for the delivery of drugs has increased dramatically in the last decade. To ensure the desired properties and functionality of such substances, adequate characterization in terms of the molar mass (M) and size is essential. The aim of this study was to evaluate the changes in the M and size of PVP-b-PAMPS when the amounts of the synthesis reactants in the two-step radical reaction were varied. The determination of the M and size distributions was performed by an asymmetric flow field-flow fractionation (AF4) system connected to multiangle light scattering (MALS) and differential refractive index (dRI) detectors...
April 16, 2018: Analytical and Bioanalytical Chemistry
Hanem Younes Elfeky, Mona Salah Fayed, Maged Sultan Alhammadi, Sanaa Abou Zeid Soliman, Dalia Mohamed El Boghdadi
INTRODUCTION: The aim of this study was to three-dimensionally analyze the net skeletal, dental, and temporomandibular joint (TMJ) treatment changes using Twin Block functional therapy in comparison to untreated subjects. MATERIALS AND METHODS: The study (Twin Block) group comprised 22 female patients with skeletal Class II malocclusion due to mandibular retrusion. A total of 18 skeletal Class II untreated female subjects were included as controls. Skeletal, dental, and TMJ changes were evaluated using pre- and posttreatment/observational by cone beam computed tomography (CBCT) images...
April 16, 2018: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
Fatih Cabbar, Muammer Çağrı Burdurlu, Ceyda Özçakır Tomruk
OBJECTIVES: Dental anxiety may play a central role in the oral health status and treatment outcomes of oral surgical procedures. The study aimed to investigate the effect that brief written information has over patients undergoing oral surgical procedures and to evaluate factors that may cause anxiety. METHOD AND MATERIALS: A prospective study was performed on 38 mandibular third molar surgery patients (mean age 26.74 ± 6.44 years) and 56 implant surgery patients (mean age 49...
April 16, 2018: Quintessence International
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