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Brazilian Oral Research

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https://www.readbyqxmd.com/read/30517430/how-to-improve-root-canal-filling-in-teeth-subjected-to-radiation-therapy-for-cancer
#1
Fabiana de Góes Paiola, Fabiane Carneiro Lopes, Jardel Francisco Mazzi-Chaves, Rodrigo Dantas Pereira, Harley Francisco Oliveira, Alexandra Mussolino de Queiroz, Manoel Damião de Sousa-Neto
The aim of this study was to evaluate the influence of radiation therapy on root canal sealer push-out bond strength (BS) to dentin and the sealer/dentin interface after different final irrigation solutions (NaOCl, EDTA, and chitosan). Sixty-four maxillary canines were distributed into two groups (n=30): non-irradiated and irradiated with 60 Gy. Canals were prepared with Reciproc-R50 and subdivided (n=10) for final irrigation (NaOCl, EDTA, chitosan) and filled. Three dentin slices were obtained from each root third...
November 29, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30517429/evaluation-of-chemokines-and-receptors-in-gnotobiotic-root-canal-infection-by-f-nucleatum-and-e-faecalis
#2
Caroline Christine Santa-Rosa, Marcela Marçal Thebit, Kamilla Faria Maciel, Luciana Carla Neves de Brito, Leda Quercia Vieira, Antônio Paulino Ribeiro-Sobrinho
The present study aims to evaluate the longitudinal effects of induced experimental infections in gnotoxenic animals on the expression of inflammatory chemokines and their receptors in periradicular tissues. The null hypothesis tested was that Enterococcus faecalis and Fusobacterium nucleatum had no effect on CCR5, CCL5, CXCL10, CCL2/MCP-1, CXCR2 and CCR1 expression. Two groups of five animals (n = 5) aged between 8 and 12 weeks were used in this study. The animals were anaesthetized, and coronary access was performed in the first molar on the right and left sides...
November 29, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30517428/assessment-of-toxicity-and-oxidative-dna-damage-of-sodium-hypochlorite-chitosan-and-propolis-on-fibroblast-cells
#3
Zeliha Uğur Aydin, Kerem Engin Akpinar, Ceylan Hepokur, Demet Erdönmez
The objective of this study was to evaluate and compare the cytotoxicity and genotoxicity on human fibroblast cell lines of sodium hypochlorite (NaOCl), chitosan and propolis as root canal irrigating solutions. Human fibroblast cells were exposed to chitosan, propolis and NaOCl for 4 and 24 h. Cell viability was assessed by 2,3-bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide, and oxidative DNA damage was assessed by determination of 8-hydroxydeoxyguanosine (8-OHdG) level with an ELISA kit...
November 29, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30517427/influence-of-ceramic-material-thickness-of-restoration-and-cement-layer-on-stress-distribution-of-occlusal-veneers
#4
João Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Marcela Moreira Penteado, Alexandre Luiz Souto Borges, Marco Antonio Bottino
The aim of this study was to evaluate stress distribution in an occlusal veneer according to the restorative material, restoration thickness, and cement layer thickness. A tridimensional model of a human maxillary first molar with an occlusal veneer preparation was constructed using a modeling software of finite element analysis. The model was replicated 9 times to evaluate the factors: restoration thickness (0.6, 1.2, and 1.8 mm) and cement layer thickness (100, 200, and 300 μm). Then, each model received different restorative materials (High Translucency Zirconia - [YZHT], Lithium Disilicate - [LD], Zirconia Reinforced Lithium Silicate - [ZLS], Feldspathic - [F], and Hybrid Ceramic - [HC]), totaling forty-five groups...
November 29, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30517426/quality-of-life-and-mastication-in-denture-wearers-and-cleft-lip-and-palate-adults
#5
Marina Rechden Lobato Palmeiro, Mariana Bauer Bronstrup, Justin Durham, Angus Walls, Rosemary Sadami Arai Shinkai
The impact of oral rehabilitation on masticatory function and oral health-related quality of life (OHRQoL) may vary with the experience of the individual with tissue loss. Our hypothesis is that patient-centered outcomes vary among adults who have experienced large defects in the maxilla due to congenital or acquired conditions even after oral rehabilitation to restore aesthetics and function. This study compared OHRQoL, perceived masticatory ability, maximum bite force (MBF), and symptoms of pain and depression among subjects with acquired (edentulous maxilla) and congenital (cleft lip and palate) loss of oral tissues in the maxilla after dental treatment...
November 29, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30462750/light-curing-resin-cements-containing-iodonium-salts-promote-suitable-apical-bonding-of-posts-to-radicular-dentin
#6
Thatiana de Vicente Leite, Andrea Nóbrega Cavalcanti, Adriano Fonseca de Lima, Luciano de Souza Gonçalves, David Christopher Watts, Giselle Maria Marchi Baron, Luis Roberto Marcondes Martins
The aim of this study was to analyze the efficiency of experimental light-curing resin cements (ERCs) with a ternary photo-initiator system containing diphenyliodonium hexafluorphosphate (DPI) and different amines on retention of glass-fiber posts to dentin (GFP). ERCs formulations: a 1:1 mass ratio of 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenylpropane and triethyleneglycol dimethacrylate. Camphorquinone was used as initiator. Six experimental groups were established according to the amine used: [ethyl-4-(dimethylamino)benzoate-EDMAB or 2-(dimethylamino)ethyl methacrylate-DMAEMA] and the concentration of DPI (0, 0...
November 14, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30462749/efficacy-of-stem-cells-on-bone-consolidation-of-distraction-osteogenesis-in-animal-models-a-systematic-review
#7
Carlos Manuel Rubio Morillo, Mariane Cristina Sloniak, Fernanda Gonçalves, Cristina Cunha Villar
Distraction osteogenesis (DO) relies on the recruitment and proliferation of mesenchymal stem cells (MSC) to the target site, where they differentiate into osteoblasts to promote bone formation. Nevertheless, MSC recruitment appears to be slow and limits bone formation in DO defects. Thus, this systematic review aims to evaluate the ability of locally applied MSC to enhance bone formation in DO preclinical models. Databases were searched for quantitative pre-clinical controlled studies that evaluated the effect of local administration of MSC on DO bone formation...
November 14, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379236/immunohistochemical-expression-of-rankl-in-oral-giant-cell-lesions-is-predictive-of-aggressiveness
#8
Georgia Martini, Diogo Capella, Elena Riet Correa Rivero, Rogério Oliveira Gondak
The aim of this study was to evaluate the immunohistochemical expression of receptor activator of nuclear factor kappa-B ligand (RANKL) and of osteoprotegerin (OPG), important proteins correlated with osteoclastogenesis, in central giant cell lesions (CGCL) and peripheral giant cell lesions (PGCL) and to compare their expression with the histological and clinical parameters for quantification of multinucleated giant cells (MGC) and their nuclei, lesion size, and recurrences. Twenty cases of each lesion type were selected to quantify the number of MGCs and nuclei/mm2 of connective tissue...
October 29, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379235/exploratory-and-confirmatory-factorial-analysis-of-the-ohip-edent-instrument
#9
Anna Paula da Rosa Possebon, Fernanda Faot, Raissa Micaella Marcello Machado, Gustavo Giacomelli Nascimento, Fábio Renato Manzolli Leite
Several instruments have been used to measure oral health-related quality of life (OHRQoL). The Oral Health Impact Profile (OHIP) questionnaire was based on the concept that sequential events related to oral diseases can cause discomfort, functional limitations and consequently, result in dysfunctions and even disabilities. There are few studies in the literature that structurally analyze the instruments to verify whether they measure the requirements to which they were designed to. The objective of the study was to evaluate the internal structure of the OHIP-Edent questionnaire...
October 29, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379234/influence-of-preheating-and-post-curing-on-a-novel-fiber-reinforced-composite-post-material
#10
Letícia Nunes de Almeida, Gustavo Adolfo Martins Mendes, Isabella Negro Favarão, Amanda Vessoni Barbosa Kasuya, Marcela Gonçalves Borges, Murilo de Sousa Menezes, Rodrigo Borges Fonseca
The aim of this study was to investigate the influence of preheating and post-curing methods on diametral tensile strength (DTS), flexural strength (FS), knoop microhardness (KHN), and degree of conversion (DC) of an experimental fiber-reinforced composite (FRC). Specimens (30 wt% of 3-mm-short E-glass fiber, 22.5 wt% of methacrylated-based resin and 47.5 wt% of filler particles) were subjected to: P - photocuring at 1500 mW/cm2 for 40 s (control); P/M - photocuring and microwave post-curing (540W/5 minutes); P/A - photocuring and autoclave post-curing (120°C/15 minutes); PH-P - preheating (60°C) and photocuring; PH-P/M - preheating, photocuring and microwave post-curing; and PH-P/A - preheating, photocuring and autoclave post-curing...
October 29, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379214/the-effects-of-smoking-on-the-expression-of-gelatinases-in-chronic-periodontitis-a-cross-sectional-study
#11
Rahşan Atasoy Şentürk, Yasemin Sezgin, Şule Bulut, Binnaz Handan Özdemir
Smokers have a risk of developing periodontal disease. Matrix metalloproteinases (MMP) play a significant role in periodontal tissue destruction. In this study possible relationship between smoking and gingival tissue expression of gelatinases in chronic periodontitis patients relative to periodontally healthy subjects was investigated. Forty chronic periodontitis patients (20 smokers and 20 non-smokers) and forty periodontally healthy subjects (20 smokers and 20 non-smokers) were enrolled. The clinical periodontal measurements recorded, and gingival tissues harvested after that...
October 25, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379213/edema-and-gingival-bleeding-in-anterior-region-have-a-negative-influence-on-quality-of-life-of-adolescents
#12
Marília Cunha Maroneze, Lucas Miers Goergen, Rae Cristian Lanza de Souza, José Mariano da Rocha, Thiago Machado Ardenghi
The aim of the present study was to verify if clinical signs of gingivitis such as color changes, edema, and bleeding in the anterior region influence the OHRQoL of adolescents. We followed a cross-sectional convenience sample of 67 adolescents aged 11 to 16 years receiving dental treatment at the Federal University of Santa Maria (UFSM), in southern Brazil. The participants were evaluated for the following clinical variables: edema, gingival color alteration, and marginal bleeding of the gingival tissues, collected at 6 sites per tooth in the anterior region of the mouth...
October 25, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379212/can-implant-surfaces-affect-implant-stability-during-osseointegration-a-randomized-clinical-trial
#13
Luiz Carlos do Carmo Filho, Raissa Micaella Marcello-Machado, Eduardo Dickie de Castilhos, Altair Antoninha Del Bel Cury, Fernanda Faot
This randomized clinical trial evaluated the insertion torque (IT), primary, and secondary stability of dental implants with different surface treatments during the osseointegration period. Nineteen patients with bilateral partial edentulism in the posterior mandibular region were randomly allocated to two implant brand groups and received implants with different surface treatments in the opposite site of the arch: Osseotite and Nanotite or SLA and SLActive. During implant placement, the maximum IT was recorded using a surgical motor equipped with a graphical user interface...
October 25, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379211/physicomechanical-characterization-and-biological-evaluation-of-bulk-fill-composite-resin
#14
Armiliana Soares Nascimento, Daniel Bezerra Lima, Marcus Vinicius Lia Fook, Monica Soares de Albuquerque, Eliane Alves de Lima, Marcos Antonio Sabino, Silvia Maria Pinto Borges, Pedro Tardelly Diniz Filgueira, Yasmine Carvalho de Sousa, Rodivan Braz
The aim of this study was to evaluate the cytotoxic effect, degree of conversion (% DC), Vickers hardness (VH), and surface morphology of composite resins. Eleven resins, nine bulk-fill resins, and two conventional resins were evaluated. Each material was sampled to evaluate DC (using FTIR), VH, cytotoxicity (using MTT and Neutral Red - NR test), surface morphology (using SEM and AFM), and organic filler (using EDS). All statistical tests were performed with SPSS and the level of significance was set at 0.05...
October 25, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379210/can-heat-pressed-feldspathic-ceramic-be-submitted-to-multiple-heat-pressing
#15
Amanda Maria de Oliveira Dal Piva, Aline Serrado de Pinho Barcellos, Marco Antonio Bottino, Rodrigo Othávio de Assunção E Souza, Renata Marques de Melo
The aim of this study was to determine if multiple processing (heat-pressing) of a dental ceramic influences flexural strength, hardness, and microstructure. Ninety bar-shaped specimens (15 mm × 4 mm × 2 mm) of a pressed ceramic (Vita PM9) were fabricated and randomly divided into 6 groups (n = 15) according to the factors "number of pressings" (C1, C2, and C3, fired 1, 2, and 3 times, respectively) and "mechanical cycling" (M). Half of the specimens were mechanically cycled (106 cycles, 45 N, 3...
October 25, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379209/factors-associated-with-the-non-wear-of-mandibular-dentures-in-the-brazilian-public-primary-health-care
#16
Mara Rodrigues Martins, Marco Túlio Moreira de Souza, Juliene Fonte Boa, Débora Emrich Magalhães, Andreia Maria Duarte Vargas, Luís Otávio Miranda Cota, Aline Araujo Sampaio, Efigênia Ferreira E Ferreira
This study investigated factors that affect the use of complete conventional mandibular dentures (CCMD) by patients of the Brazilian Public Health Service. For this, two hundred and thirty one subjects who received CCMD in the Primary Health Care of the Public Health Service in Belo Horizonte - Brazil were evaluated and divided in Group 1 - irregular/non-wear; Group 2 - regular wear. Multivariate logistic regression analysis was used to create predictive models for CCMD non-wear and included socio-demographic and biological variables, technical quality of CCMD, and user satisfaction...
October 25, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30379208/effects-of-the-photobiomodulation-using-different-energy-densities-on-the-periodontal-tissues-under-orthodontic-force-in-rats-with-type-2-diabetes-mellitus
#17
Mônica Fernandes Gomes, Maria da Graças Vilela Goulart, Lilian Chrystiane Giannasi, Cybelle Mori Hiraoka, Gabriela de Fátima Santana Melo, Renato Amaro Zangaro, Celestino José Prudente Nóbrega, Miguel Angel Castillo Salgado
To evaluate the impact of the GaAlAs diode laser with energy densities of 160 J/cm2, 320 J/cm2, and 640 J/cm2 on the periodontal tissues under continuous orthodontic force application and on the rate of orthodontic tooth movement in rats with type-2 diabetes mellitus. The intensity of primary alveolar bone formation was also investigated through the immune-positive osteocytes for OPN antibody. Forty adult male Wistar rats were divided into eight groups of 5 rats: normoglycemic (N), 160 J-laser-normoglycemic (160 J-LN), 320 J-laser-normoglycemic (320 J-LN), 640 J-laser-normoglycemic (640 J-LN), diabetic (D), 160 J-laser-diabetic (160 J-LD), 320 J-laser-diabetic (320 J-LD), and 640 J-laser-diabetic (640 J-LD) rats...
October 25, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30365617/how-biomechanics-can-affect-the-endodontic-treated-teeth-and-their-restorative-procedures
#18
Carlos José Soares, Monise de Paula Rodrigues, André Luis Faria-E-Silva, Paulo Cesar Freitas Santos-Filho, Crisnicaw Veríssimo, Hyeon-Cheol Kim, Antheunis Versluis
Endodontic treatment is a common dental procedure used for treating teeth which the pulp tissue has become irreversibly inflamed or necrotic as a result of the carious process or dental trauma. This procedure which involves mechanical and chemical preparation of root canal may affect several mechanical and physical properties of the tooth structure. The endodontic treatment can also influence the longevity of the rehabilitation of endodontically treated teeth and biomechanics during the oral function. For restoring endodontically treated teeth several factor and clinical decisions should be observed...
October 18, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30365616/pulp-canal-obliteration-after-traumatic-injuries-in-permanent-teeth-scientific-fact-or-fiction
#19
Juliana Vilela Bastos, Maria Ilma de Souza Côrtes
Pulp canal obliteration (PCO) is a frequent finding associated with pulpal revascularization after luxation injuries of young permanent teeth. The underlying mechanisms of PCO are still unclear, and no experimental scientific evidence is available, except the results of a single histopathological study. The lack of sound knowledge concerning this process gives rise to controversies, including the most suitable denomination. More than a mere semantic question, the denomination is an important issue, because it reflects the nature of this process, and directly impacts the treatment plan decision...
October 18, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30365615/current-options-concerning-the-endodontically-treated-teeth-restoration-with-the-adhesive-approach
#20
Marco Aurélio de Carvalho, Priscilla Cardoso Lazari, Marco Gresnigt, Altair Antoninha Del Bel Cury, Pascal Magne
Adhesive procedures have changed the way to restore endodontically treated teeth (ETT). It started with the shift from cast post-and-core to fiber post. The original focus on strength also shifted towards failure modes, revealing that catastrophic failures are still a concern when restoring endodontically-treated teeth even with fiber posts. As an alternative, postless approaches have been proposed in order to improve the chances of repair. The goal of this critical review is to present a survey of the current knowledge on adhesive approaches to restore endodontically treated teeth with and without extensive coronal tissue loss...
October 18, 2018: Brazilian Oral Research
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