Porselen laminate veneerler hakkındaki YouTube videolarının değerlendirilmesi

Amaç: Bu çalışmanın amacı, estetik dental uygulamalardan biri olan porselen laminate veneer uygulamaları hakkındaki YouTube videolarının içeriğini değerlendirmektir.Gereç ve Yöntem: ‘Porselen laminate veneer’ anahtar sözcükleri kullanılarak YouTube’da sistematik bir arama yapıldı. Videolar yükleyiciye göre sınıflandırılıp, bilgi içerikleri değerlendirildi. Video bilgileri-kalite indeksi aracılığıyla video kalitesi hesaplandı. Ayrıca videoların etkileşim ve görüntülenme oranları da analiz edildi. Elde edilen veriler, istatistiksel olarak incelendi ve anlamlılık p0.01 ve p0.05 düzeylerinde değerlendirildi.Bulgular: Çalışma kapsamında taranan ilk 120 video içerisinden 70 video çalışmaya dahil edildi. Video yükleyicilerine göre dağılımlar değerlendirildiğinde, en fazla videonun TV kanalları (n=17, %25.3) tarafından yüklendiği görüldü. Video yükleyicileri değişmeksizin, tüm videoların bilgi içeriğinin yetersiz olduğu tespit edildi. Protetik diş tedavisi uzmanları tarafından yüklenen videoların daha fazla izlendiği ve etkileşim oranlarının istatistiksel olarak daha yüksek olduğu (p0.05), ancak bu videoların bilgi içeriği açısından diğer yükleyicilere ait videolardan yetersiz olduğu tespit edildi.Sonuç: Porselen laminate veneerler ile ilgili YouTube videolarının bilgi içerikleri yetersiz bulundu. En çok görüntülenen YouTube videoları, protetik diş tedavisi uzmanlarına ait olsa da bu videoların içeriklerinin bilgi akışı ve video kalitesi gibi parametreler açısından diğer yükleyicilere göre daha yetersiz olduğu tespit edildi

The effect of different cleaning agents and resin cement materials on the bond strength of contaminated zirconia

The purpose of this study was to examine the effect of different cleaning methods and resin cements on the shear bond strength (SBS) of contaminated zirconia. A total of 92 disc-shaped zirconia specimens were contaminated with different procedures. Then, the specimens were grouped according to cleaning methods and resin cements: no cleaning + Variolink Esthetic DC (CNV), no cleaning + Panavia V5 (CNP), sandblasted + Variolink Esthetic DC (SBV), sandblasted + Panavia V5 (SBP), Ivoclean + Variolink Esthetic DC (ICV), Ivoclean + Panavia V5 (ICP), Katana Cleaner + Variolink Esthetic DC (KCV), and Katana Cleaner + Panavia V5 (KCP). Following an aging protocol in a 37 degrees C for 1 week, SBS analysis was performed with a universal test machine. For the surface topography and elemental analysis, scanning electron microscopy and energy-dispersive X-ray spectroscopy (EDS) were used. Significance was evaluated as p .05 and p .01. The highest SBS results were found in the SBP group, showing a statistically significant difference from all other groups (p .05). For the same cleaning method, Panavia V5 showed statistically significantly higher SBS values than Variolink Esthetic DC (p .01), except the CNP-CNV (p = .880) and KCP-KCV (p = .082) groups. The most detected surface elements by EDS were Zr, O, C, and N, respectively. The contaminated zirconia surfaces must be cleaned for successful adhesion. The use of phosphate-containing adhesives in combination with sandblasting will increase the adhesion strength, and universal cleaning agents can be a good alternative to sandblasting

Quality of information in -Masseter botox- videos on YouTube: Is it a sufficient guide for potential patients?

Introduction: Recently, the usage of social media for information purposes by patients has gained popularity. Objectives: This study aims to evaluate the content of YouTube videos about botulinum toxin injections applied to the masseter muscle. Material and methods: A systematic search of YouTube videos was conducted using the key words "masseter Botox", and 102 videos were included in the study. The videos were classified according to type and uploader, and the information content was evaluated. Video information and quality index were used and viewing rates of the videos were also calculated. Results: Data obtained were analyzed statistically. Most of the videos were found to be information videos (79.4%), and most of them uploaded by beauty centers (34.3%). The information content of the educational and information videos was found to be statistically higher than the patient experience videos (p 0.01). When the viewing rates of the videos were examined, it was found that the patient experience videos were observed more, and the interaction rates were statistically higher (p 0.01). Conclusions: The information content of the masseter Botox-related YouTube videos was found to be insufficient. It is important to overcome this shortcoming with videos with high information content prepared by experts in related fields. © 2020 Termedia Publishing House Ltd.. All rights reserved

Evaluation of residual contamination on reused healing abutments

Objectives The purpose of this study is to evaluate residual contamination of healing abutments sterilized by dealers of dental implant companies. Material and methods Healing abutments collected from dealers of different implant companies were randomly numbered, and they were examined for visible deformation and contamination on the abutment surface, packaging errors, and presence of a sterilization indicator. The healing abutments were stained with a dye solution for contamination detection and evaluated by dividing into different regions. The presence of residual contamination was examined through photographic images taken from the healing abutments and the data obtained were recorded. Pearson's chi-square analysis was used to evaluate the relation between implant brands and contamination status. Significance was evaluated as p Results Visible residual contamination was detected in approximately 31% of the healing abutments. After the staining procedure, in the visual assessment of the stained surfaces, residual contamination was found in at least one region of all healing abutments except one (n=176, 99.4%). The most intense staining was seen in the screw driver hole (n=172, 97.1%), body (n=113, 63.8%), occlusal (n=107, 60.4%), screw (n=79, 44.6%), and connector (n=72, 40.6%) regions, respectively. A significant relationship was found between the brands and the contamination status (p 0.05). Conclusion The reuse of healing abutments is not suitable, as it does not ensure optimum cleaning and sterilization, and it is not possible to eliminate contaminants completely

Deviation of Dental Implants Placed by Guided Implant Surgery in Bone Structures with Different Densities

Purpose: This study aimed to evaluate the deviations of implants with two different geometries placed with a bone-supported stereolithographic surgical template into the bone of Misch classification densities of D2, D3, and D4. Materials and Methods: Eight maxilla and eight mandible models were macrodesigned according to the jaw geometries. Bone densities of these models were created in parallel with the most frequently observed densities in the locations: D3 bone density in the anterior maxilla, D4 bone density in the posterior maxilla, D2 bone density in the anterior mandible, and D3 bone density in the posterior mandible. A bone-supported stereolithographic surgical template was prepared in accordance with the jaw models and planning and used to place 64 NobelParallel Conical Connection RP 4.3 × 13 mm and 64 NobelActive 4.3 × 13 mm implants on the models. Global deviation, lateral deviation, angular deviation, and depth deviation between planned and placed implants were calculated with Hypermesh. The Kruskal-Wallis test was used to analyze the differences between deviation data of the study groups, and the Mann-Whitney U test was used for pairwise comparisons of groups with significant differences. Significance was evaluated as P .05). When the data of all studies were evaluated, the deviation values for all maxillary and mandibular implants were examined regardless of bone and implant type; no statistical difference was found between the arches in terms of deviation type (P > .05). Conclusion: Regardless of the macrogeometry of the dental implants placed with the guide, no significant difference was observed between the deviation values of the different bone densities they were applied to

Impact of Resin Cement and Adhesive Systems on the Bond Strength of Polyetheretherketone Dental Restorations

Objective: This study investigated the effect of adhesive systems and resin cements on the shear bond strength (SBS) of poly (ether ether ketone). Materials and Methods: 60 disc-shaped PEEK samples were divided into 2 according to the adhesive system to be applied (n=30): (1) Visio.link; (2) Scotchbond Universal and further divided according to resin cement (n=10): (1) Panavia V5; (2) Panavia SA Universal; (3) Variolink Esthetic cement. Resin cements with a diameter of 3 mm and a height of 2 mm were bonded to the adhesive-applied specimens. After thermal-cycling (5,000x), SBS was measured, and failure types (cohesive, adhesive and mixed) were evaluated. Data were analyzed by two-way ANOVA and Tukey HSD test for pairwise comparisons (p0.05). Results: No significant differences were found among the adhesives. Variolink Esthetic showed the lowest SBS, followed by Panavia SA Universal and Panavia V5 cement, respectively. Only 21.4% of SBS could be explained by the cement, the interaction of adhesive and cement, or the adhesive. The partial eta-squared values revealed that cement had the highest effect on SBS values (0.244). All the groups showed predominant adhesive failure. Conclusion: Chairside adhesives showed similar bond strength to standard PEEK adhesives, and all the cement were above the minimum acceptable bonding strength according to ISO 10477, but only dual-cure resin cement was clinically acceptable. Therefore, cementation with dual-cure resin cement following the universal adhesive application is a safe bonding procedure that can be applied in the clinic for the cementation of PEEK restorations

Evaluation of marginal adaptation in three-unit frameworks fabricated with conventional and powder-free digital impression techniques

PURPOSE. The purpose of this in vitro study was to evaluate the marginal misfits three-unit frameworks fabricated with conventional and digital impressions techniques. MATERIALS AND METHODS. Thirty brass canine and second premolar abutment preparations were fabricated by using a computer numerical control machine and were randomly divided into 3 groups (n=10) as follows: conventional impression group (Group Ci), Cerec Omnicam (Group Cdi), and 3shape TRIOS-3 (Group Tdi) digital impression groups. The laser-sintered metal frameworks were designed and fabricated with conventional and digital impressions. The marginal adaptation was assessed with a stereomicroscope at x30 magnification. The data were analyzed with 1-way analysis of variances (ANOVAs) and the independent simple t tests. RESULTS. A statistically significant difference was found between the frameworks fabricated by conventional methods and those fabricated by digital impression methods. Multiple comparison results revealed that the frameworks in Group Ci (average, 98.8 +/- 16.43 mu m; canine, 93.59 +/- 16.82 mu m; premolar, 104.10 +/- 15.02 mu m) had larger marginal misfit values than those in Group Cdi (average, 63.78 +/- 14.05 mu m; canine, 62.73 +/- 13.71 mu m; premolar, 64.84 +/- 15.06 mu m) and Group Tdi (average, 65.14 +/- 18.05 mu m; canine, 70.64 +/- 19.02 mu m; premolar, 59.64 +/- 16.10 mu m) (P=.000 for average; P=.001 for canine; P.05). CONCLUSION. The three-unit frameworks fabricated with digital impression techniques showed better marginal fit compared to conventional impression techniques. All marginal misfit values were clinically acceptable

Prognostic significance of micropapillary pattern in lung adenocarcinoma and expression of apoptosis-related markers: caspase-3, bcl-2, and p53

Demirag, Funda/0000-0003-4790-8369WOS: 000294073500002PubMed: 21851414Cakir E, Yilmaz A, Demirag F, Oguztuzun S, Sahin S, Yazici UE, Aydin M. Prognostic significance of micropapillary pattern in lung adenocarcinoma and expression of apoptosis-related markers: caspase-3, bcl-2, and p53. APMIS 2011; 119: 574-80. We evaluated the clinicopathological characteristics and prognostic significance of lung adenocarcinoma with micropapillary pattern (MPP) and analyzed the expression of apoptosis-related markers: caspase-3, bcl-2, and p53. A series of 166 lung adenocarcinoma that had been surgically resected between 2004 and 2009 were reviewed. Histopathologic patterns, presence of tumor necrosis, mitosis, lymphovascular and perineural invasion, the status of pleura, and tumor differentiation were examined. Of the 166 patients; 71 were stage I, 35 stage II, 51 stage III, and nine stage IV. Histologically they were divided into two groups: MPP-positive (n = 55) and MPP-negative (n = 111). The following items were significantly more frequent in the MPP positive group: female gender (p = 0.03), lymph node metastasis (p = 0.031), and pleural invasion (p = 0.045). Age, smoking status, tumor stage, lymphatic invasion, perineural invasion, mitotic count, and survival rates had no statistically significant difference between groups (p > 0.05). In MPP positive tumors, visceral pleural invasion was identified significantly more frequent than in MPP negative tumors, at stage I. Tumors with MPP showed elevated expressions of caspase-3 (94.5%), p53 (60%), and bcl-2 (54.5%). In MPP positive group, the expression of these three markers had no statistically significant impact on survival. In whole population, bcl-2 expression was correlated with a better outcome. We conclude that MPP is associated with poor prognostic factors both in early and late stages in lung adenocarcinoma. Bcl-2 provides prognostic information independent from the MPP

Clinical Impact Of Visceral Pleural, Lymphovascular And Perineural Invasion In Completely Resected Non-Small Cell Lung Cancer

Objectives: This study is conducted to show the relationship between visceral pleural, lymphovascular, and perineural invasion, and other clinicopathologic characteristics and their significance as prognostic factors. Methods: The clinicopathologic characteristics of 289 patients who underwent a potentially curative surgical resection between 2000 and 2009 in our clinic were reviewed retrospectively. The prognostic factors were then evaluated by univariate and multivariate analysis. The patients who were given neoadjuvant-adjuvant chemotherapy and/or radiotherapy and who died due to postoperative mortality were excluded. Data from 188 patients were analyzed. Results: Out of the 188 patients (108 diagnosed as adenocarcinoma and 80 squamous cell carcinoma), 66 patients had lymphovascular invasion, 53 patients had perineural invasion, and 92 patients had visceral pleural invasion. Visceral pleural invasion was related with T factor, tumor histology, dimension, stage, and differentiation. Lymphovascular invasion was related with N status and stage. Perineural invasion was observed more frequently in tumors with moderate/poor differentiation. Visceral pleural and lymphovascular invasion were found to be poor prognostic factors but we could not show statistically meaningful effect of perineural invasion on survival. Conclusion: The presence of visceral pleural or lymphovascular invasion can show higher risk of mortality whereas perineural invasion has no effect on prognosis. (C) 2011 European Association for Cardio-Thoracic Surgery. Published by Elsevier B.V. All rights reserved.WoSScopu

Carotid intima-media thickness in chronic obstructive pulmonary disease and survival: A multicenter prospective study

Introduction Chronic obstructive pulmonary disease (COPD) is associated with increased cardiovascular morbidity and mortality. Carotid intima-media thickness (CIMT) is a noninvasive method assessing atherosclerosis. Objective It was aimed to determine relationship and survival between COPD and CIMT. Methods CIMT was measured using Doppler ultrasound (USG) in 668 stable COPD patients at 24 centers. Patients were followed-up for 2 years. Results There were 610 patients who completed the study. There were 200 patients CIMT with = 0.78 mm (group 2). There was a significant difference at the parameters of age, gender, smoking load, biomass exposure, GOLD groups and degree of airway obstruction (FEV1) between groups 1 and 2. Our results revealed positive correlations between mean CIMT and age, smoking load (pack-years), biomass exposure (years), exacerbation rate (last year), duration of hypertension (years) and cholesterol level; negative correlations between CIMT and FEV1 (P 0.05). Conclusion This study is the first regarding CIMT with combined GOLD assessment groups. It has revealed important findings supporting the increase in atherosclerosis risk in COPD patients. We recommend Doppler USG of the carotid artery in COPD patients at severe stages