Background. Recently, non-presintered chromium-cobalt (Cr-Co) blocks with the commercial name of Ceramill Sintron were introduced to the market. However, comprehensive studies on the dimensional accuracy and fit of multi-unit frameworks made of these blocks using the coordinate measuring machine (CMM) are lacking. This study aimed to assess and compare the dimensional changes and fit of conventional casting and milled frameworks using Ceramill Sintron. Methods. A metal model was designed and scanned and 5-unit frameworks were fabricated using two techniques: (I) the conventional casting method (n=20): the wax model was designed, milled in the CAD/CAM machine, flasked and invested; (II) the milling method using Ceramill Sintron blocks (n=20): the wax patterns of group 1 were used; Ceramill Sintron blocks were milled and sintered. Measurements were made on the original reference model and the fabricated frameworks using the CMM in all the three spatial dimensions, and dimensional changes were recorded in a checklist. Data were analyzed with descriptive statistics, and the two groups were compared using one-way ANOVA and Tukey test (α=0.05). Results. The fabricated frameworks in both groups showed significant dimensional changes in all the three dimensions. Comparison of dimensional changes between the two groups revealed no significant differences (P>0.05) except for transverse changes (arch) that were significantly greater in Ceramill Sintron frameworks (P<0.05). Conclusion. The two manufacturing processes were the same regarding dimensional changes and the magnitude of marginal gaps and both processes resulted in significant dimensional changes in frameworks. Ceramill Sintron frameworks showed significantly greater transverse changes than the conventional frameworks.
Objective: It can be said that approximately 60-70% of the general population would probably experience at least one symptom of temporomandibular disorder (TMD) in their lives, but only about 5% of these people seek treatment. On the other hand, depression and anxiety are now recognized as a serious public health problem among adults. Anxiety disorder is a chronic, high-risk disease that may lead to dysfunction and reduce quality of life. The aim of this study was to assess the association between depression and anxiety with TMD in dentistry students of Zanjan Dental School in 2020-2021.Methods: The population of this study consisted of students with TMD, and the control population was selected from students of the same faculty. To collect the data, volunteers first answered questions about the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD). Then the Depression, Anxiety and Stress Scale (DASS-21) questionnaire was completed by students in both groups. The collected data were then entered into stata software version 14.Results: According to the results of univariate analysis of logistic regression, gender, tuition, residential status, stress, anxiety and depression have a significant effect on TMD (P <0.2). After examining the 2021; 16(4): 590-594
Background: None of the previous studies have evaluated acrylic resin teeth used at the Dentistry Department of Hamadan University of Medical Sciences (brands: Finix, Super Berelian, and Betastar). Methods: A total of 252 samples containing acrylic resin teeth used at Hamadan Dental School were studied. Finix, Super Berelian, and Betastar were selected in the same mold and in 3 colors. (A1, A2, A3). The samples of each brand were studied in 2 groups. The first group was placed in a solution of Dentipur cleaner for 7 days. The second group of specimens was placed in 100 mL of distilled water. Data were recorded in the CIELAB system, and the spectrophotometer obtained values of ΔE, ΔL, ΔH, and ΔC. Then, changes in each of the components were obtained before and after the intervention. Results: The results show that the changes in the parameters of ΔE, ΔL and ΔC were statically significant when comparing the 2 groups (P < 0.05) and only in terms of the parameter ΔH, the changes were not statically significant (P > 0.05). The changes made in the variables were significantly different from the initial color of the samples in the factors ΔE, ΔL and ΔH (P < 0.001) but in terms of the parameter ΔC, the changes were not statically significant (P > 0.001), and the changes in the variables were significantly different from the sample brand in all the measured factors (P < 0.001). Conclusions: Dentipur denture cleaner creates more color change than distilled water in acrylic teeth. The changes in most variables were associated with the shade of acrylic teeth, and in the teeth with brighter shade, the color change was higher compared with a darker shade. Super Berelian teeth have the most color change and Betastar teeth showed the lowest change in color. Delta E value was clinically acceptable.
This article reports a 13-year-old boy with phenylketonuria and multiple superficial mucoceles on his lower lip. Phenylketonuria (PKU) is a serious and rare genetic disorder that affects the levels of amino acids such as phenylalanine in the body. If left untreated, PKU can negatively affect mental function and cause retardation. Patients with PKU receive less oral examination compared to the normal population. Mucoceles are lesions formed by the accumulation of mucous of salivary glands in soft tissue by blockage or extravasation. Local trauma has been identified as the main cause of mucoceles development. Superficial mucoceles are rare in the lower lip. These patients need close oral and maxillofacial examination to find problems, which may be related to their systemic problem. Micro-marsupialization is a conservative therapeutic approach for management of pediatric oral mucoceles. Management of trauma in patients with mental retardation is an important issue.
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