Brazilian oral research最新文献

The aim of this study was to assess the prevalence of temporomandibular disorder (TMD) and associated factors in an adult population in southern Brazil. The population-based sample (n = 4.65) included participants from Passo Fundo, a town in southern Brazil. The Fonseca Anamnestic Index was used to establish the prevalence of TMD. Sociodemographic and pathophysiologic factors and those that could cause tissue injury (trauma) were investigated. Data were analyzed using the chi-square or Fisher's exact test and Poisson regression model (p < 0.05; 95%CI). The prevalence of TMD was 13.4%, and the most prevalent symptoms were pain in the neck and/or shoulders (30.1%), headache (26.0%), and presence of popping or clicking sounds (17.0%). None of the sociodemographic factors (sex, age, marital status, occupation, and education) were associated with the prevalence of TMD (p > 0.05). Among pathophysiologic factors, those associated with the prevalence of TMD were insomnia (PR: 1.83; 95%CI: 1.07-3.12), osteoporosis (PR: 2.50; 95%CI: 1.22-5.12), rheumatoid arthritis (PR: 1.99; 95%CI: 1.07-3.68), and xerostomia (PR: 1.36; 95%CI: 1.07-1.73). The factors that could cause tissue trauma/injury associated with TMD were sleep bruxism (PR: 2.16; 95%CI: 1.01-4.62), awake bruxism (PR: 2.44; 95%CI: 1.16-5.11), tongue pressure against the teeth (PR: 4.11; 95%CI: 1.95-8.65), and neck support of objects during work (PR: 2.94; 95%CI: 0.88-9.73). The prevalence of TMD was 13.44%, and it was associated with pathophysiologic factors and those that cause tissue trauma/injury, but not with sociodemographic factors.

This in vitro study evaluated the effect of proanthocyanidin, palm oil, and vitamin E against initial erosion. Bovine enamel blocks (n = 140) were divided into 14 groups: C+_SnCl2/NaF/Am-F-containing solution (positive control); C-_deionized water (negative control); O_palm oil; P6.5_6.5% proanthocyanidin; P2_2% proanthocyanidin; E_Vitamin E (97.8% oily tocopherol acetate); OP6.5_palm oil + 6.5% proanthocyanidin; P6.5O_6.5% proanthocyanidin + palm oil; OP2_palm oil + 2% proanthocyanidin; P2O_2% proanthocyanidin + palm oil; EP6.5_Vitamin E + 6.5% proanthocyanidin; P6.5E_6.5% proanthocyanidin + Vitamin E; EP2_Vitamin E + 2% proanthocyanidin; P2E_2% proanthocyanidin + Vitamin E. The acquired enamel pellicle (AEP) was previously formed in situ for 30 min. The specimens were treated in vitro with the solutions (500 µL, 30s). Then, the blocks were maintained for an additional hour in oral cavity to develop the modified AEP. The blocks were immersed in 0.5% citric acid (pH 2.5) during 30s. The response variable was the percentage of surface hardness loss (%SHL). Data were analyzed by one-way ANOVA and Fisher's LSD test (p<0.05). P6.5E (12±7_%SHL) was the only group that promoted similar protection to C+ (11±8_%SHL). O (17±13_%SHL), P2 (20±10_%SHL), OP6.5 (19±12_%SHL), P2O (21±13_%SHL), P6.5E (12±7_%SHL), and P2E (19±9_%SHL) exhibited %SHL similar to both C+ and C- (25±10_%SHL) groups (p<0.05). P6.5 (23±11_%SHL), E (27±8_%SHL), P6.5O (24±13_%SHL), OP2 (27±12_%SHL), EP6.5 (24±11_%SHL), and EP2 (26±11_%SHL) were different to C+ and similar to C-. It was concluded that the combination of 6.5% proanthocyanidin and vitamin E (P6.5E) was the most effective strategy against enamel erosion, aligning closely with the positive control.

This study evaluated the influence of a customized healing abutment (CHA) placed on immediate implants. It also assessed bone ridge volume, keratinized mucosal collar, and postoperative pain. Thirty-one patients needing tooth extraction and immediate implant were selected. Gingival papilla height, bone ridge volume, and keratinized mucosal collar thickness were measured using a millimeter periodontal probe and a dry-point caliper. A visual analog scale (VAS) was applied to determine postoperative pain. Study participants were randomly assigned to a control group (n = 15, with extraction, immediate implant placement, alveolar gap filling with a bovine bone graft, PTFE barrier, and suture) and an experimental group (n = 16, with extraction, immediate implant placement, gap filling with a bovine bone graft, and CHA). The healing abutments were prepared before surgery and customized during the procedure. The data were tabulated and statistically analyzed using the Mann-Whitney test (α = 0.05). The "changes in the papilla" outcome presented a statistical difference, and the control group showed higher values than those of the experimental group (p = 0.04). The remaining characteristics demonstrated no statistical differences between the groups (p > 0.05). CHA and the barriers exhibited similar behavior in maintaining bone ridge and keratinized mucosal thickness. CHA proved more effective than the conventional barrier in preserving the gingival papilla, with the distance measured three months post-surgery averaging 17% greater than the pre-surgical measurement.

Understanding recurrent injuries in the deciduous dentition and possible associated factors could help in the control and prevention of such episodes in children. The aim of the present study was to investigate the frequency of recurrent injuries in the deciduous dentition and associated factors. A retrospective cross-sectional study was conducted involving 517 children aged between six months and six years treated at the Clinic for Traumatic Dental Injuries in the Deciduous Dentition of the School of Dentistry of the Universidade Federal de Minas Gerais. Data were collected from dental records with information on sociodemographic and clinical characteristics. Data analysis involved descriptive statistics, chi-square test, and bivariate and multivariate Poisson regression analyses (p < 0.05; 95%CI). The prevalence of recurrent tooth injuries in the deciduous dentition was 17.2% (n = 89). Children aged between four and six years (PR = 1.917; 95%CI: 1.055-3.484; p = 0.033), those with inadequate lip protection (PR = 1.790; 95%CI: 1.085-2.953; p = 0.023), those with uncomplicated crown and crown-root fractures (PR = 1.856; 95%CI: 1.224-2.816; p = 0.004), and those with complicated crown and crown-root fractures (PR = 1.818; 95%CI: 1.021-3.239; p = 0.042) had a greater frequency of repeated tooth injuries compared to children without these characteristics. In the present study, older age, inadequate lip coverage, and the occurrence of complicated and uncomplicated crown and crown-root fractures were associated with repeated injuries in the deciduous teeth.

This study assessed the effect of saliva exposure on roughness (Ra) and Vickers hardness (VHN) of two direct restorative materials, enamel, and dentin adjacent to the restorations. Enamel and dentin cavities in molars (n = 10) were restored with a) bulk-fill resin composite (Tetric N-Flow Bulk Fill, BF) with the application of a universal adhesive (Tetric N-Bond Universal) and b) alkasite restorative material (Cention N, CN) with and without the application of a universal adhesive. After 24 h (baseline), surface roughness and hardness of the restorative material and dental tissues were assessed at 100 μm from the tooth/restoration interface. The specimens were subjected to degradation in whole saliva for 7 days (combined with the application of 20% sucrose 10x/day). Ra and VHN were then reassessed. The data were analyzed by ANOVA and Tukey's test (α = 5%). BF exhibited a significantly lower Ra than CN. Ra increased significantly after degradation in saliva when compared to baseline values. Enamel hardness was higher for BF restorations. No differences in enamel hardness were observed for alkasite restorations with and without adhesive application. For dentin hardness, significantly lower values were found in alkasite restorations with previous application of an adhesive system. It can be concluded that BF had a smoother surface than CN before and after degradation. Immersion in saliva reduced the hardness of both restorative materials, enamel, and dentin adjacent to the restoration.

This cross-sectional study aims to investigate the prevalence of oral manifestations in a sample of the Brazilian population with COVID-19. Adults diagnosed with COVID-19 through real-time PCR/serological tests were invited to participate. The online questionnaires were distributed at different times to analyze and compare SARS-CoV-2 variants considering the period of prevalence of these variants in Brazil. A total of 846 participants were included, of whom 539 were diagnosed before the Omicron variant. In total, 47.28% were vaccinated with at least two doses. The prevalence of oral manifestations was 52.6% (95%CI: 49.23-55.95), and the most common manifestations included taste disorder (38.06%; 95%CI: 34.85-41.38), xerostomia (17.61%; 95%CI: 15.19-20.32), and halitosis (11.58%; 95%CI: 9.59-13.92). The prevalence of persistent symptoms in post-COVID-19 was 12.1% (95%CI: 10.0-14.4) for taste disorder and 5.4% (95%CI: 4.1-7.1) for xerostomia. A significant association was found between females and persistent taste disorder (p = 0.0084) and oral manifestation and depression/anxiety (OR = 1.855, 95%CI: 1.267-2.717, p = 0.002), worse oral hygiene (OR = 1.729, 95%CI: 1.189-2.516, p = 0.004), and medication use (OR = 1.630, 95%CI: 1.123-2.367, p = 0.010) (p < 0.0001). In the Alpha, Beta, Gamma, and Delta variants, compared with the Omicron variant, taste disorder and xerostomia were less present when toothbrushing habits remained unchanged or improved (p < 0.0001). Oral manifestations in patients with COVID-19 were associated with depression/anxiety, worse oral hygiene, and medication, all of which reinforce its multifactorial etiopathogenesis.

The principal objective of this studywas to produce and characterize a machinable glass ceramic containing muscovite-mica as the main crystalline phase to be used as a dental restorative material. The secondary objective was to evaluate the use of muscovite-mica to improve machinability and generate a toughening mechanism in the experimental glass ceramic. After fine milling of a feldspathic glass frit was milled and then mixed with muscovite-mica, die-pressed, and sintered under vacuum at 850 to 1,150 °C. The resulting sintered composite was characterized by X-ray diffraction, scanning electron microscopy, and had its fracture toughness evaluated by micro-indentation. The results were as follows: (a) improved thermal stability of muscovite-mica crystals in the composite; (b) improved leucite crystallization in the feldspathic glass matrix by increasing sintering temperature in the studied range ; (c) the composites consisting of glass + 10% muscovite and glass + 20% muscovite sintered at 1,050°C presented fracture toughness values of 9.0 ± 1.2 and 8.4 ± 0.6 MPa.m1/2, respectively, which are higher than those found in the literature for glass ceramics. Feldspar frit blocks with addition of muscovite-mica (up to 20%) can be densified at temperatures between 1,050 and 1,150°C. This material was stable at a temperature substantially higher than the stability limit of pure muscovite and also showed indentation fracture toughness values greater than those reported in the literature for other glass ceramics.

The objective was to compare physical accessibility indicators for people with motor disabilities (PwMD) at dental specialty centers (acronym in Portuguese - CEO) across Brazil during the two evaluation cycles of the Access and Quality Improvement Program (acronym in Portuguese - PMAQ) for CEOs. This ecological study utilized secondary data from the external evaluation of PMAQ-CEO in Cycle I (C1), conducted in 2014, and Cycle II (C2), conducted in 2018, including all CEOs that participated in both cycles (n = 889). The structural items analyzed included corridors and doors adapted for wheelchairs, functional wheelchairs, access ramps with handrails, and bathrooms adapted for PwMD. Latent class transition analysis was applied to identify patterns in physical accessibility among CEOs, selecting the latent status (LS) model based on conceptual interpretability and goodness of fit. The final model identified five LS, labeled as follows: LS1 (most accessible); LS2 (inappropriate doors and bathrooms); LS3 (inappropriate ramps and bathrooms); LS4 (wheelchair unavailability); and LS5 (least accessible). In C1, 33.9% of the CEOs were highly accessible, while 17% were minimally accessible. In C2, these proportions shifted to 69.7% for highly accessible and 6% for minimally accessible. When analyzing the two PMAQ-CEO cycles, improvements in physical accessibility indicators were observed across Brazilian CEOs: corridors (9.7% increase) and doors (4.9%) adapted for wheelchairs; functional wheelchairs (15.7%); access ramps with handrails (38.7%); and bathrooms adapted for PwMD (19.6%). It may be concluded that physical barriers to PwMD in Brazilian CEOs were significantly reduced between 2014 and 2018, improving physical accessibility.

This in vitro study evaluated the effects of citric acid (CA) on surface properties, biofilm removal, and electrochemical performance of Co-Cr alloys compared to common denture cleansers. Co-Cr discs were divided into five groups based on the decontamination solution: NaCl 0.9% (control), Corega Tabs®, Periogard®, and 10% CA. The surface was characterized at baseline in terms of morphology, topography, and chemical and phase composition. Surface properties, including microhardness, wettability, and roughness, were assessed before and after exposure to each solution. Microbial viability, metabolic activity, and morphology of the polymicrobial biofilm were assessed after treatment to evaluate the efficacy of the decontamination solutions. Electrochemical and morphological evaluations were performed to assess the impact of each solution on the alloy's corrosion process. No significant changes in microhardness were observed (p > 0.05). Decontamination solutions significantly increased surface hydrophilicity (p < 0.05) and roughness, though Ra values remained below the threshold for bacterial colonization. All denture cleansers significantly reduced biofilm viability compared to NaCl (p < 0.05), with no viable colonies post-treatment. The CA group showed a significant reduction in bacterial metabolic activity compared to NaCl and Periogard® (p < 0.05), indicating superior biofilm disruption. Electrochemical tests demonstrated that CA maintained a stable Cr-oxide passive layer, evidenced by nobler OCP values and lower icorr and corrosion rates compared to Periogard® (p < 0.05). SEM images revealed pitting corrosion in all groups, except CA. These findings suggest that CA is a promising and safer alternative for denture care, offering effective antimicrobial action while preserving the electrochemical integrity of Co-Cr alloys.

This study aimed to evaluate the adaptation of CAD/CAM crowns and the impact of resin cement polymerization contraction on crown deformation under different cementation configurations. Thirty human molars were randomly divided into three groups (n = 10) to manufacture ceramic crowns with three different cementation space configurations: LD40 (40 μm), LD80 (80 μm), and LD160 (160 μm). The samples were subjected to computerized microtomography scanning for measuring internal and marginal adaptation, and internal fit was analyzed at occlusal, axial, axiogingival points. Five light-curing protocols were used to verify the wavelength spectrum peak of the curing device and the irradiance delivered using two situations: with 0 mm sensor distance and through a ceramic of differing thickness, and an external crown deformation (ECD) test. The highest statistically significant vertical fit was obtained for group LD40, independent of region. LD160 yielded the highest ECD values, independent of positioning of the buccal and distal strain gauge. The highest internal fit was observed at occlusal and axial points of the LD160 group (P<0.001), and LD80 yielded the lowest values at the axiogingival point (p = 0.003, p = 0.006). The irradiance delivered was reduced significantly upon interposition of the ceramic block to the sensor. The peak wavelength for curing was similar among the LD groups. The luting space configurations significantly influenced vertical fit and the ECD results for the CAD/CAM ceramics owing to polymerization shrinkage. Finally, variations in ceramic thickness at different sites affected both the irradiance by the curing device and ECD results.