63 research outputs found

    Effect of repeated firing on the topographical, optical, and mechanical properties of fully crystallized lithium silicate-based ceramics

    Get PDF
    Statement of problemThe influence of different firing protocols on the topographical, optical, and mechanical properties of fully crystallized computer-aided design and computer-aided manufacturing (CAD-CAM) lithium silicate-based glass-ceramics (LSCs) for dental restorations remains unclear.PurposeThe purpose of this in vitro study was to investigate the effect of different firing regimens on the surface roughness, gloss, Martens hardness, indentation modulus, biaxial flexural strength, and crystalline structure of fully crystallized CAD-CAM LSCs and the effect of their interposition on the irradiance of a light-polymerization unit.Material and methodsThree fully crystallized CAD-CAM LSC blocks were evaluated (N=150): lithium disilicate (Initial LiSi Blocks; LS), zirconia-reinforced silicate (Celtra Duo; CD), and lithium aluminum disilicate (CEREC Tessera; CT). Specimens were allocated to 5 subgroups according to their firing protocol. LSC roughness (Sa) was measured with an optical profilometer, and gloss (GU) was detected with a gloss meter. Martens hardness (HM) and indentation modulus (EIT) data were obtained from a hardness testing machine. The irradiance of a light-polymerization unit and transmittance of LSCs were measured with an instrument (Managing Accurate Resin Curing-Light Collector; BlueLight analytics, Inc) subsequent to ceramic interposition. Crystalline phases were analyzed by X-ray diffraction, and biaxial flexural strength (ŌÉ) was determined by the ball-on-3-ball method in a universal testing machine followed by Weibull analysis to calculate characteristic strength (ŌÉ0) and Weibull modulus (m). Two-way ANOVA and Tukey HSD post hoc tests (őĪ=.05) were used to analyze the data.ResultsStatistically significant differences were found among different treatment groups based on Sa, GU, HM, and EIT values (P<.001). Delivered irradiance was significantly reduced following CT (P<.01) and glazed LSC (P<.005) interposition. CD displayed highest biaxial flexural strength and reliability after 1 firing cycle (ŌÉ=568.2¬†MPa, m=16.8) CONCLUSIONS: The type of material and firing regimens had a significant effect on the topographical, optical, and mechanical properties of fully crystallized CAD-CAM LSCs. Glazing significantly reduced delivered irradiance, Martens hardness, and biaxial flexural strength

    Accessibility of Health Data Representations for Older Adults: Challenges and Opportunities for Design

    Get PDF
    Health data of consumer off-the-shelf wearable devices is often conveyed to users through visual data representations and analyses. However, this is not always accessible to people with disabilities or older people due to low vision, cognitive impairments or literacy issues. Due to trade-offs between aesthetics predominance or information overload, real-time user feedback may not be conveyed easily from sensor devices through visual cues like graphs and texts. These difficulties may hinder critical data understanding. Additional auditory and tactile feedback can also provide immediate and accessible cues from these wearable devices, but it is necessary to understand existing data representation limitations initially. To avoid higher cognitive and visual overload, auditory and haptic cues can be designed to complement, replace or reinforce visual cues. In this paper, we outline the challenges in existing data representation and the necessary evidence to enhance the accessibility of health information from personal sensing devices used to monitor health parameters such as blood pressure, sleep, activity, heart rate and more. By creating innovative and inclusive user feedback, users will likely want to engage and interact with new devices and their own data

    Pressure pain sensitivity is associated with dental fear in adults in middle age: Findings from the Northern Finland 1966 birth cohort study

    Get PDF
    IntroductionDental fear is a prevalent problem leading to severe deterioration of oral health and health‚Äźrelated quality of life. Despite the knowledge that dental fear is closely linked to painful experience, the association between pain sensitivity and dental fear remains unclear. This study was designed to evaluate this association with validated measures of dental fear and pressure pain sensitivity in a cohort population.MethodsThe study population consisted of a subpopulation of the Northern Finland Birth Cohort 1966. At the age of 46 years, 1736 participants completed the valid and reliable Modified Dental Anxiety Scale (MDAS) and participated in a clinical examination, where their nonorofacial pressure pain sensitivity was evaluated by validated pressure pain threshold (PPT) and tolerance (PPTo) measurements. Gender‚Äźspecific Tobit regressions were performed to analyse this association adjusted for smoking and depressive and anxiety symptoms.ResultsWomen with moderate dental fear had 5% (31.3 kPa; P ConclusionsNonorofacial pressure pain threshold and tolerance appeared to be lower in participants with dental fear, which emphasizes the role of pain sensitivity in dental fear.<br /

    Salivary Flow Rates in Various Occlusal Support Zones in Elderly Individuals

    Get PDF
    &nbsp; Introduction: Elderly individuals experience many changes in the oral cavity, one of which is tooth loss. Tooth loss disrupts the relationships between the maxillary and mandibular occlusions, which is detrimental to mastication. Mastication influences salivary secretion due to the salivary-masticatory reflex. Pressure on the teeth during mastication activates mechanoreceptors in the periodontal ligament, which can also stimulate salivary secretion. Objective: This study aimed to describe the salivary flow rates in various occlusal support zones in the elderly based on the Eichner Index. Methods: The study was cross-sectional and used a descriptive research method. The sample population comprised 36 elderly subjects residing in the village of Lebak Gede, Indonesia. Occlusal support zones were classified using the Eichner Index and stimulated salivary flow rates were measured using the Saxon test.&nbsp; Results: The sample population‚Äôs mean salivary flow rate was 1.35‚ÄȬĪ‚ÄČ0.65 mL/min. The mean salivary flow rates for Eichner classifications A, B1, B2, and B3, were 1.56‚ÄȬĪ‚ÄČ0.78 mL/min, 1.52‚ÄȬĪ‚ÄČ0.56 mL/min, 1.18‚ÄȬĪ‚ÄČ0.45 mL/min, and 0.95‚ÄȬĪ‚ÄČ0.86 mL/min, respectively. Conclusion: The mean stimulated salivary flow rate tended to decrease as occlusal support zones decreased in Eichner classifications A, B1, B2, and B3

    Acesso ao atendimento odontol√≥gico de pacientes portadores de dist√ļrbios hemorr√°gicos e da hemoglobina heredit√°rios

    Get PDF
    Orientador: Prof. Dr. Cassius Carvalho Torres PereiraCoorientador: Prof. Dr. Fabian Calixto FraizDisserta√ß√£o (mestrado) - Universidade Federal do Paran√°, Setor de Ci√™ncias da Sa√ļde, Programa de P√≥s-Gradua√ß√£o em Odontologia. Defesa : Curitiba, 02/03/2021Inclui refer√™ncias√Ārea de concentra√ß√£o: EstomatologiaResumo: Pessoas com dist√ļrbios hemorr√°gicos (DHH) e dist√ļrbios da hemoglobina (DHb) heredit√°rios enfrentam barreiras de acesso ao atendimento odontol√≥gico devido aos riscos espec√≠ficos da doen√ßa ou devido √†s barreiras relacionadas ao paciente, como a recusa profissional ao atendimento odontol√≥gico. Isso contribui para a deteriora√ß√£o da sa√ļde bucal e pode aumentar a necessidade de tratamento odontol√≥gico invasivo. O objetivo deste estudo observacional transversal foi de identificar as principais barreiras de acesso ao atendimento odontol√≥gico de pacientes com DHH e DHb. Indiv√≠duos atendidos na cl√≠nica odontol√≥gica do Centro de Hematologia e Hemoterapia do Estado do Paran√° (HEMEPAR) foram convidados √† participar desta pesquisa, no per√≠odo de agosto de 2019 √† mar√ßo de 2020. Os dados foram coletados por meio de um question√°rio composto por quest√Ķes socioecon√īmicas e demogr√°ficas, auto percep√ß√£o ou condi√ß√Ķes de sa√ļde bucal relatadas pelos pais, perguntas sobre acesso a servi√ßos e hist√≥rico de tratamento odontol√≥gico. O modelo de regress√£o de Poisson univariado e multivariado com vari√Ęncia robusta foi empregado para determinar associa√ß√Ķes entre a recusa profissional ao atendimento odontol√≥gico e as demais covari√°veis (p <0,05). Os participantes (29,1%) j√° sofreram recusa profissional ao atendimento odontol√≥gico. A maioria dos indiv√≠duos com DHH (53,2%) n√£o sente confian√ßa em seu dentista devido √† tend√™ncia de sangramento. Grande parte da amostra (64,6%) sentiu-se apreensiva ao visitar um dentista generalista. A maior preval√™ncia de recusa profissional esteve associada √† idade (RP = 1,021; IC95%: 1,010-1,032). Indiv√≠duos sem risco aumentado de sangramento tiveram menor preval√™ncia de recusa profissional ao atendimento odontol√≥gico quando comparados √†queles com risco aumentado de sangramento (RP = 0,536; IC 95%: 0,291-0,990). A recusa profissional de atendimento odontol√≥gico foi alta em pacientes com DHH, especialmente para adultos mais velhos. Eles t√™m falta de confian√ßa em seu dentista generalista devido √† tend√™ncia de hemorragia e a maioria dos participantes fica apreensivo em procurar um dentista fora de um centro especializado. DHH sofreu mais recusa do que DHb devido ao seu risco aumentado de sangramento.Abstract: People with inherited bleeding (IBD) and haemoglobin disorders (HbD) face barriers to access dental care due to the specific risks inherent to each disease. This contributes to the deterioration of oral health and may increase the need for invasive dental treatment. The aim of this cross-sectional study was to identify the main barriers to dental care access for patients with IBD and HbD. Those individuals seen at the Paran√° State Centre of Haematology and Haemotherapy (HEMEPAR)'s dental clinic were invited to participate in this study between August 2019 and March 2020. Data were collected through a questionnaire consisting of socioeconomic and demographic items on self or parent-reported oral health conditions, questions about access to dental services and history of dental treatment. Univariate and multiple Poisson regression model with robust variance was used to determine associations between professional refusal of dental care and other co-variables (P < 0.05). The participants (29.1%) have already had professional refusal of dental care. The majority of the participants with IBD (53.2%) did not feel confident with their local dentist due to their bleeding tendency and most (64.6%) felt apprehensive about visiting the local dentist. The high incidence of refusal to provide dental care was associated with age (PR = 1.021; 95%C = 1.010-1.032). Individuals with low bleeding risk were less likely to be denied dental care by a professional compared to those with high bleeding risk (PR = 0.536; 95%CI = 0.291-0.990). Professional refusal of dental care was high in IBD patients particularly for older adults. Most participants felt apprehensive about seeking an outside dentist and patients with IBD were more denied dental care than those with HbD due to their increased risk of bleeding

    Atlas de histología bucodental

    Get PDF
    Se trata de un atlas fotogr√°fico con descripci√≥n de preparados de microscop√≠a √≥ptica, complementado con microscop√≠a electr√≥nica destinado a la ense√Īanza y el aprendizaje de temas de histolog√≠a bucodental a nivel universitario de grado y posgrado. Incluye a su vez, una introducci√≥n te√≥rica y consideraciones cl√≠nicas. Los temas tratados corresponden a los tejidos que conforman la pieza dentaria, sus estructuras de soporte y de protecci√≥n, mucosa bucal, gl√°ndulas salivales y diente temporario. Cada cap√≠tulo se organiza con una breve descripci√≥n te√≥rica con la intenci√≥n de ubicar al lector en el tejido correspondiente, im√°genes de preparados con distintas magnificaciones y su correspondiente descripci√≥n, finalizando con conceptos histol√≥gicos relacionados con la pr√°ctica cl√≠nica.Facultad de Odontolog√≠

    Operatoria dental : Nociones para el aprendizaje

    Get PDF
    La presente obra aborda la tem√°tica correspondiente al curso 1 de T√©cnica de Operatoria Dental, donde se desarrolla en forma actualizada, el instrumental, los principios generales de las preparaciones dentarias, histolog√≠a de los tejidos dentarios y t√©cnicas para el correcto desempe√Īo en cuanto a la elaboraci√≥n correcta de las preparaciones cavitarias.Facultad de Odontolog√≠

    Memorias de las Cuartas Jornadas de Actualización en Prácticas Odontológicas Integradas PPS-SEPOI 2020

    Get PDF
    Al igual que las ediciones previas, la finalidad es proporcionar una exhaustiva revisi√≥n de los √ļltimos alcances de la Odontologia, para que sea accesible a los estudiantes, √ļtil a los residentes y que constituya una obra de referencia valiosa para los graduados. Esta cuarta edici√≥n ha intentado conservar un equilibrio entre ciencias b√°sicas, m√©todos de diagn√≥stico, aplicaci√≥n pr√°ctica y una gran variedad de trabajos de investigaci√≥n y extensi√≥n. Queremos expresar nuestro agradecimiento al Se√Īor Decano Profesor Doctor Gabriel E. Lazo y a la Se√Īorita Profesora Doctora Maria Mercedes Medina por el acompa√Īamiento durante todo el proceso. A las secretar√≠as de Asuntos Acad√©micos, Ciencia y T√©cnica, Posgrado, Extensi√≥n y Planificaci√≥n. A los Profesores y auxiliares docentes por su participaci√≥n.Facultad de Odontolog√≠

    Photodeagradable hydrogels for tissue gluing

    Get PDF
    Hydrogel biomaterials for wound care dressing and tissue gluing need to adhere to tissue and on-demand disappear. Advanced tissue adhesives also envision the encapsulation of therapeutic drugs or cells to promote the healing process. The design of hydrogels with all these functionalities is challenging. In this PhD, hydrogels that fulfil several of the previous properties for wound dressing at reasonable chemical complexity is presented. These hydrogels can be formed in situ and encapsulate cells, they can adhere to tissue and detach after use by light exposure at cytocompatible doses. The developed photodegradable hydrogels are based on 4-star PEG end-catechol precursors for crosslinking, and intercalate photocleavable o-nitrobenzyl groups in their structure. These gels can form at mild oxidative conditions and encapsulate cells or microparticles. UV-vis light exposure (őĽ= 365 or 405 nm) photocleavables the nitrobenzyl moiety and promotes degradation. This can occur at cytocompatible doses, and enables on-demand detachment from tissue and release of the encapsulated materials or cells. These biomaterials are interesting for the development of advanced tissue adhesives and cell therapies, by expanding the range of functionality of existing choices.Die entwickelten photodegradierbaren Hydrogele basieren auf 4-Stern-PEG, das in dieser Arbeit chemisch mit endst√§ndigen Catecholgruppen und photospaltbaren o-Nitrobenzylgruppen modifiziert wurde. Die Vernetzung erfolgt √ľber die Catecholgruppen unter oxidativen Bedingungen in HEPES-Puffer mit 9-18 mM Natriumperiodat als Oxidationsmittel. Diese Bedingungen sind mild genug, um lebende Zellen oder Mikropartikeln in das Material einzubetten. Bei Belichtung mit UV (őĽ 365 nm) oder sichtbarem Licht (őĽ 405 nm) in zytokompatiblen Lichtdosen f√∂rdert die photospaltbare Nitrobenzyleinheit den Hydrogelabbau, was die on-demand Freisetzung von Zellen und das Abl√∂sen vom Gewebe erm√∂glicht. Diese Biomaterialien sind interessant f√ľr die Entwicklung fortschrittlicher Gewebeklebstoffe und Zelltherapien, und erweitern den Funktionsumfang gegen√ľber bisherigen Auswahlm√∂glichkeiten.The research presented in this doctoral thesis has been performed at the INM-Leibniz- Institute for New Materials (Saarbr√ľcken) and was funded by the European Union within the Marie Sklodowska-Curie Innovative Training School (BioSmartTrainee, Project No. 642861)

    Appropriate age range for introduction of complementary feeding into an infant’s diet

    Get PDF
    Peer reviewedPublisher PD
    • ‚Ķ
    corecore