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https://www.readbyqxmd.com/read/29775860/a-cone-beam-computed-tomography-study-of-the-mesial-cervical-concavity-of-maxillary-first-premolars
#1
Linfeng Fan, Keyong Yuan, Chenguang Niu, Rui Ma, Zhengwei Huang
OBJECTIVE: To investigate the mesial cervical concavity of maxillary first premolars and its relationship with root and canal configuration using cone-beam computed tomography (CBCT). DESIGN: Images of maxillary first premolars (n = 1056) were collected from patients (n = 601) who had undergonein vivo CBCT scanning. The root and canal number and morphology were evaluated. The following measurements of the mesial cervical concavity of the maxillary first premolars were evaluated in section images: dentine thickness (in concavity at the cemento-enamel junction), concavity angle, depression depth (distance from mesial dentinal surface at concavity to mesial proximity), concavity position (distance from mesial dentinal wall at invagination to the top of the mesial marginal ridge)...
May 7, 2018: Archives of Oral Biology
https://www.readbyqxmd.com/read/29775637/modified-resin-infiltration-of-non-micro-and-cavitated-proximal-caries-lesions-in-vitro
#2
H Askar, F Schwendicke, J Lausch, H Meyer-Lueckel, S Paris
OBJECTIVE: Infiltrant resin (IR) is currently indicated for non-cavitated caries lesions. However, modifying the technique might expand its indication spectrum to micro-cavitated lesions. The present study aimed to evaluate the penetration/filling ability of a newly developed micro-filled infiltrant resin (MFIR) in non-, micro- and cavitated natural caries lesions. MATERIALS AND METHODS: Proximal lesions in 120 extracted human teeth with ICDAS-2 (n = 30), 3 (n = 45) and 5 (n = 45) lesions were etched with 15% hydrochloric acid gel for 2 min and allocated to one of the following treatments; IR: lesions (ICDAS-2, 3 and 5; each n = 15) were treated with commercial infiltrant resin for 3 min...
May 15, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29773104/-knockdown-of-msx2-gene-inhibits-the-expression-of-enamel-matrix-proteins-and-the-enamel-mineralization-in-mouse-ameloblasts
#3
Hao Liu, Jianping Jiang, Qi Gong, Huanbing Tian, Sheng Wang, Juanjuan Zhang, Zhifang Pan, Xiaoying Liu
Objective To study the effect of muscle segment homeodomain homeobox 2 (MSX2) on the expression of enamel matrix protein and the formation of enamel. Methods Immunohistochemical staining was used to detect the expression of MSX2 in mouse tooth embryos and its localization in ameloblasts. The short hairpin RNA (shRNA) of the MSX2 gene was designed and synthesized, and then the annealed double stranded DNA was constructed into the pGMLV-SC5 RNAi lentivirus vector, and finally it was packaged with lentivirus. The lentivirus was used to infect ameloblasts...
March 2018: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/29771131/mouthwash-containing-croton-doctoris-essential-oil-in-vitro-study-using-a-validated-model-of-caries-induction
#4
Yasmin Etienne Albuquerque, Marcelle Danelon, Marcos José Salvador, Cristiane Yumi Koga-Ito, Alberto Carlos Botazzo Delbem, Román Yesid Ramirez-Rueda, Aline Vidal Lacerda Gontijo, Fernanda Lourenção Brighenti
AIM: To validate an in vitro caries model and to evaluate an experimental mouthwash containing Croton doctoris essential oil.  Materials & methods: To validate the experimental model, we used McBain medium and polymicrobial biofilms. The EOM (essential oil mouthwash) was tested using the validated model. Microbial composition (colony-forming unit/ml), acidogenicity, enamel demineralization (percentage of surface enamel hardness loss), cytotoxicity and essential oil composition were evaluated...
May 17, 2018: Future Microbiology
https://www.readbyqxmd.com/read/29769002/defense-mechanisms-against-acid-exposure-by-dental-enamel-formation-saliva-and-pancreatic-juice-production
#5
Robert Racz, Akos Nagy, Zoltan Rakonczay, Erika Katalin Dunavari, Gabor Gerber, Gabor Varga
The pancreas, the salivary glands and the dental enamel producing ameloblasts have marked developmental, structural and functional similarities. One of the most striking similarities is their bicarbonate-rich secretory product serving acid neutralization. An important difference between them is that while pancreatic juice and saliva are delivered into a lumen where they can be collected and analyzed, ameloblasts produce locally precipitating hydroxyapatite which cannot be easily studied. Interestingly, the ion and protein secretion by the pancreas, the salivary glands, and maturation ameloblasts are all two-step processes, of course with significant differences too...
May 15, 2018: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29768619/prevalence-and-factors-associated-with-enamel-defects-among-preschool-children-from-a-southeastern-city-in-brazil
#6
Luciana Fonseca Pádua Tourino, Patrícia Maria Zarzar, Patrícia Corrêa-Faria, Saul Martins Paiva, Miriam Pimenta Parreira do Vale
This study sought to determine the prevalence of developmental defects of enamel (DDE) among preschool children and investigate associations with sociodemographic and socioeconomic factors and weight status. A cross-sectional study was conducted with 118 children aged 3 to 5 years. Data were collected via clinical examinations and a self-administered questionnaire completed by the parents. The diagnosis of DDE was performed using the modified DDE Index. Information on socioeconomic indicators (mother's schooling, monthly income per capita), child's sex and age, and age of mother at the birth of the child were obtained by questionnaire...
May 2018: Ciência & Saúde Coletiva
https://www.readbyqxmd.com/read/29768522/tif4-varnish-protects-the-retention-of-brackets-to-enamel-after-in-vitro-mild-erosive-challenge
#7
Maria Isabel Dantas de Medeiros, Hugo Lemes Carlo, Rogério Lacerda Dos Santos, Frederico Barbosa Sousa, Ricardo Dias de Castro, Renata Cristina Sobreira França, Fabíola Galbiatti de Carvalho
The effect of fluoride agents on the retention of orthodontic brackets to enamel under erosive challenge is little investigated. The aim of this study was to evaluate the effect of titanium tetrafluoride (TiF4) and sodium fluoride (NaF) agents on the shear bond strength of brackets to enamel and on the enamel microhardness around brackets under erosive challenge. Brackets were bonded to bovine incisors. Five groups were formed according to fluoride application (n=10): TiF4 varnish, TiF4 solution, NaF varnish, NaF solution and control (without application)...
May 14, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29768439/earliest-evidence-for-equid-bit-wear-in-the-ancient-near-east-the-ass-from-early-bronze-age-tell-e%C3%A1-%C3%A1-%C3%A3-fi-gath-israel
#8
Haskel J Greenfield, Itzhaq Shai, Tina L Greenfield, Elizabeth R Arnold, Annie Brown, Adi Eliyahu, Aren M Maeir
Analysis of a sacrificed and interred domestic donkey from an Early Bronze Age (EB) IIIB (c. 2800-2600 BCE) domestic residential neighborhood at Tell eṣ-Ṣâfi/Gath, Israel, indicate the presence of bit wear on the Lower Premolar 2 (LPM2). This is the earliest evidence for the use of a bit among early domestic equids, and in particular donkeys, in the Near East. The mesial enamel surfaces on both the right and left LPM2 of the particular donkey in question are slightly worn in a fashion that suggests that a dental bit (metal, bone, wood, etc...
2018: PloS One
https://www.readbyqxmd.com/read/29767434/regenerative-surgical-therapy-for-peri-implantitis-using-deproteinized-bovine-bone-mineral-with-10-collagen-enamel-matrix-derivative-and-doxycycline-a-prospective-3-year-cohort-study
#9
Faustino Mercado, Stephen Hamlet, Saso Ivanovski
OBJECTIVES: There is limited evidence regarding the long-term efficacy of regenerative treatment for peri-implantitis. The aim of this study was to evaluate a combination therapy of deproteinized bovine bone mineral with 10% collagen (DBBMC), enamel matrix derivative (EMD) and Doxycycline in the regeneration of bone defects associated with peri-implantitis. METHODS: Thirty patients diagnosed with peri-implantitis (BoP/suppuration, probing depth greater than 4 mm, minimum radiographic bone loss of 20%, at least 2 years in function) were enrolled in the study...
May 16, 2018: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/29766516/radiographic-bone-loss-in-a-scottish-non-smoking-type-1-diabetes-mellitus-population-a-bitewing-radiographic-study
#10
Anastasios Plessas, Douglas P Robertson, Penny J Hodge
BACKGROUND: The dental complications of uncontrolled diabetes include reduced salivary flow rate, candidiasis and periodontal manifestations. A recent meta-analysis concluded that diabetes patients have a significantly higher severity, but not extent, of destructive periodontal disease than non-diabetes people. The authors reported that most type-1 diabetes studies using dental radiographic data have not controlled for confounding factors such as smoking. The aim of this cross-sectional study was to compare radiographic alveolar bone loss between type 1 diabetes (T1DM) and non-diabetes (NDM) participants in a Scottish non-smoking population...
May 15, 2018: Journal of Periodontology
https://www.readbyqxmd.com/read/29765902/comparison-of-light-transmittance-in-dental-tissues-and-dental-composite-restorations-using-incremental-layering-build-up-with-varying-enamel-resin-layer-thickness
#11
Rodrigo Rocha Maia, Dayane Oliveira, Tracy D'Antonio, Fang Qian, Frederick Skiff
Objectives: To evaluate and compare light-transmittance in dental tissues and dental composite restorations using the incremental double-layer technique with varying layer thickness. Materials and Methods: B1-colored natural teeth slabs were compared to dental restoration build-ups with A2D and B1E-colored nanofilled, supra-nanofilled, microfilled, and microhybrid composites. The enamel layer varied from 0.3, 0.5, or 1.2 mm thick, and the dentin layer was varied to provide a standardized 3...
May 2018: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29765900/effect-of-various-bleaching-treatments-on-shear-bond-strength-of-different-universal-adhesives-and-application-modes
#12
Fatma Dilsad Oz, Zeynep Bilge Kutuk
Objectives: The aim of this in vitro study was to evaluate the bond strength of 2 universal adhesives used in different application modes to bleached enamel. Materials and Methods: Extracted 160 sound human incisors were used for the study. Teeth were divided into 4 treatment groups: No treatment, 35% hydrogen peroxide, 16% carbamid peroxide, 7.5% carbamid peroxide. After bleaching treatments, groups were divided into subgroups according to the adhesive systems used and application modes ( n = 10): 1) Single Bond Universal, etch and rinse mode; 2) Single Bond Universal, self-etch mode; 3) Gluma Universal, etch and rinse mode; 4) Gluma Universal, self-etch mode...
May 2018: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29765167/the-mineral-content-of-the-hard-dental-tissue-of-mesiodens
#13
Sanja Tanaskovic-Stankovic, Irena Tanaskovic, Nemanja Jovicic, Marina Miletic-Kovacevic, Tatjana Kanjevac, Zoran Milosavljevic
OBJECTIVE: Mesiodens is the most common form of supernumerary tooth mainly located between the maxillary central incisors. Its etiology is not completely understood but both genetic and environmental factors are assumed. The degree of mineralization and inorganic element content in hard tooth tissues is poorly understood as well as is the durability and suitability for allo- and auto-transplantation. Therefore aim of this study was to examine the content of inorganic elements. MATERIALS AND METHODS: This study included 26 mesiodens teeth and 26 normal central incisor teeth as controls...
May 15, 2018: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
https://www.readbyqxmd.com/read/29763738/prediction-of-early-caries-prognosis-after-fluoride-application-based-on-the-severity-of-lesions-an-in-situ-study
#14
Hee-Eun Kim, Baek-Il Kim
PURPOSE: The aim of thisin situ study was to measure baseline fluorescence loss values (ΔF(0) ) using the quantitative light-induced fluorescence (QLF) technology to screen enamel lesions for effective remineralization following fluoride application. METHODS: In this single-blindedin situ study, 20 adult volunteers wore intraoral appliances containing 4 specimens of human enamel. The surfaces of the specimens were divided into 3 regions: sound, demineralized, and treated regions...
May 12, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29761341/the-prevalence-of-developmental-defects-of-enamel-a-prospective-cohort-study-of-adolescents-in-western-sweden-a-barn-i-tanadvarden-bita-children-in-dental-care-study
#15
B Jälevik, A Szigyarto-Matei, A Robertson
AIM: To describe the prevalence of different types of developmental defects of the enamel (DDE) in varying age-cohorts and habitations, and to analyse if early trauma to the primary teeth and early subsequent serious health problems were related to DDE in the permanent dentition. Dental fear and anxiety, and aesthetic problems as a consequence of DDE were also investigated. METHODS: DDE was registered over 5 years annually in three age cohorts (796 children). The DDE index (FDI Commision on Oral Health, Research and Epidemiology, Int Dent J 42:411-426, 1992) was used...
May 14, 2018: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29760824/the-impact-of-orthodontic-bands-on-the-marginal-periodontium-of-maxillary-first-molars-a-retrospective-cross-sectional-radiographic-analysis
#16
Sabine Teubner, Patrick R Schmidlin, Giorgio Menghini, Thomas Attin, Stefan Baumgartner
Aim: Available information on the effect of orthodontic treatment on crestal alveolar bone levels measured in radiographs is contradictory. The aim of this study was to compare the alveolar bone level and periodontal ligament space of banded upper first molars to untreated controls. Materials and Methods: This retrospective cross-sectional radiographic study investigated alveolar bone levels of upper first molars of an orthodontic test group and an untreated control group of comparable age (15-16...
2018: Open Dentistry Journal
https://www.readbyqxmd.com/read/29758152/efficacy-of-teeth-whitening-with-a-mouthwash-in-vitro-and-in-vivo-approaches
#17
Franco Gasparri, Bruce Richard Schemehorn, Andrea Zanardi
OBJECTIVES: Two different studies were conducted to evaluate the whitening efficacy of a mouthwash versus a placebo using in vitro and in vivomodels. The tested mouthwash was formulated with no oxidizing or abrasive agents containing chlorhexidine (CHX) and polyvinylpyrrolidone (PVP). METHODS: The purpose of the in vitro study was to determine whether the mouthwash formulation OC15AB could reduce the accumulation of staining in an accepted stain model. Bovine central incisors were cut to obtain enamel specimens of ~8 × 8 mm2...
March 2018: Journal of Clinical Dentistry
https://www.readbyqxmd.com/read/29754154/-series-caries-prevention-in-historical-perspective-fluoride
#18
H Kalsbeek
Shortly after the Second World War it became known in the Netherlands that fluoride can contribute to the prevention of dental caries. As to how this effect was achieved, opinions differed. Initially, the dominant the view was that fluoride had to be absorbed into the enamel and dentine during tooth formation to make the teeth resistant to caries. Later it was discovered that decalcification of the enamel is inhibited if fluoride is present in the dental plaque. While in the beginning water fluoridation was considered to be the most effective measure to prevent caries, the current position is that tooth brushing with fluoride toothpaste plays the most important role in caries prevention...
May 2018: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/29752807/oral-health-and-school-performance-in-a-group-of-schoolchildren-from-the-federal-district-brazil
#19
Raquel Francis Almeida, Soraya Coelho Leal, Jordana Guedes Amorim Medonca, Leandro Augusto Hilgert, Ana Paula Dias Ribeiro
OBJECTIVES: To evaluate whether an association exists between school performance, quality of life, dental caries, and dental pain in children between 6 and 8 years of age. METHODS: All 6- to 8-year-old children enrolled in the second year of the six public schools in Paranoá-FD were invited to participate in this cross-sectional study. In total, 374 consented. Dental caries was recorded according to the Caries Assessment Spectrum and Treatment (CAST) index by two trained examiners...
May 12, 2018: Journal of Public Health Dentistry
https://www.readbyqxmd.com/read/29752597/the-higher-prevalence-of-developmental-defects-of-enamel-in-the-dioxin-affected-region-than-non-dioxin-affected-region-result-from-a-cross-sectional-study-in-vietnam
#20
Vo Truong Nhu Ngoc, Le Thi Huong, Bui Van Nhon, Ngo Thi Minh Tan, Pham Van Thuc, Vo Thi Thu Hien, Truong Manh Dung, Ngo Van Toan, Le Quynh Anh, Le Hoang Son, Thien Chu-Dinh, Dinh-Toi Chu
Developmental defects of enamel (DDE) are induced and regulated by several factors including genetics and the environment. There is evidence showing that dioxin in polluted areas has a strong effect on the health and development of teeth. However, there has been no study on DDE in the dioxin-affected regions in Vietnam. To identify the effect of dioxin on the prevalence of DDE in studied areas in Vietnam, a cross-sectional study was conducted in 2200 adults in the A Luoi district in the Thua Thien Hue province (the dioxin-affected region) and in the Kim Bang district in the Ha Nam province (dioxin-unaffected region) in 2015...
May 11, 2018: Odontology
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