1,720,961 research outputs found
Evaluation of postoperative pain in single visit and multiple visit retreatments with different intracanal medicaments
No full textKanal tedavisi, kök kanalı içerisindeki enfekte dokunun uzaklaştırılarak geriye kalan yapının orjinal forma uygun genişletilip, temizlenerek doldurulmasını içeren bir tedavi şeklidir. Eskiden birkaç seansta tamamlanan bu tedavi tekniği, yeni çıkan aletler ve malzemeler ile tek seansta güvenli bir şekilde tamamlanabilmektedir. Tek seansta yapılan uygulamalar, birden fazla seansta uygulanan kanal tedavilerine göre daha avantajlıdır. Yeniden kanal tedavisi uygulaması daha önce kanal tedavisi yapılmış ancak başarısız olmuş dişlerde kanal tedavisinin yeniden uygulanmasını öngören bir tedavi tekniğidir. Postoperatif ağrı, seans sayısı kadar, tedavi öncesinde ve tedavi sırasında karşılaşılan faktörlerle de ilişkilendirilmektedir. Tek veya c?ok seans yeniden kanal tedavisi uygulamalarından sonra hastalarda farklı du?zeylerde ag?rı s?ikayetleri olmaktadır. Bu ağrı genelde artık pulpa dokusu ve periodontal dokuların iltihabi reaksiyonu ile meydana gelmektedir. Yeniden kanal tedavisi protokolünün, tek seansta güvenli ve verimli bir şekilde yapılabilmesi klinik endodonti uygulamalarında zaman kazanımı ve masraf açısından daha verimli bir aşamaya geçilmesini sağlayacaktır. Ayrıca çok seansta yapılan kök kanal tedavilerinde, kök kanalının komplike anatomik yapısı nedeniyle seans arasında uygulanan kanal içi medikamentlerin dentin kanalcıklarında, istmuslarda ve lateral kanallardaki mikroorganizmalara ulaşamaması veya bazı mikroorganizmalara karşı etkisiz kalması söz konusu olabilmektedir. Ek olarak geçici dolgu bulunan kronun kırılmaya müsait yapısı ve Ca(OH)2 gibi bazı kanal içi medikamentlerin kostik etkileri nedeniyle dentin direnci azaldığı için kök kanal tedavisi esnasında veya sonrasında kırık riski ortaya çıkmaktadır. Bu nedenle bu çalışmada asemptomatik 2 dişlerde tek seansta ve farklı medikamentler kullanılarak çok seansta yapılan yeniden kanal tedavisi uygulamalarında oluşan postoperatif ağrının karşılaştırılarak değerlendirilmesi amaçlanmıştır.Root canal treatment is a procedure consists of removal of the infectious tissue, cleaning and shaping of the remaning structure according to the original form. With new tools and materials this treatment technique can be completed safely in single visit instead of multiple visits. Single visit treatments are more advantagesous than multiple visits root canal treatments in terms of time and cost. Retreatment is a type of treatment procedure which is applied in teeth with previously failed root canal treatments. Postoperative pain is associated with number of visits as well as preoperative and intra operative factors. Single visit and multiple visit retreatment procedures may cause complaint of pain in different levels among patients. Inflammatory reaction due to remaning pulp tissue or to traumatized periodontal tissue are the main causes of the postoperative pain. To be able to perform the retreatment procedure safely and efficiently in single visit, will bring a time and cost wise more efficient era in clinical endodontic applications. In addition, root canal treatment carried out in multiple visits has negative clinical consequences such as the inability of the intracanal medicament to be able to come in contact with the residual microorganisms within the dentinal tubules, isthmus or in lateral canals due to the complicated anatomical structure of the root canal, or the ineffectiveness against these microorganisms even if those medicaments can come in contact with. However, due to fragile state of the crown with temporary filling in multiple visit root canal treatment and the caustic effect of some intracanal medicaments such as Ca(OH)2, the dentin resistance is reduced constituting a high risk of fractures during or after the treatment procedure. Therefore, the aim of this study is to compare the postoperative pain in single visit and multiple visit retreatments with different intracanal medicaments in asymptomatic teeth
Microbial analysis of endodontic infections in teeth with post-treatment apical periodontitis before and after medication
Full text linkThis study aimed to determine the intraradicular microbiota of previously root canal-treated teeth with apical periodontitis and to investigate the antibacterial effectiveness of different intracanal medicaments. Sixteen patients with post-treatment apical periodontitis were allocated into two groups according to the intracanal medicament used: calcium hydroxide (CH) and 2% chlorhexidine gluconate gel (CHX) group. Total bacterial loads, as well as the amount of Enterococcus faecalis (E. faecalis) were determined before (S1) and after (S2) chemomechanical preparation and finally, after intracanal medication (S3) by means of ddPCR. The unpaired t test was used to compare parametric. S3-total bacteria copy number of the CH group was lower than the CHX group (p 0.05). But in terms of total bacteria, CH is better than CHX. Consequently, CH can be used to optimise the antibacterial efficiency of chemomechanical preparation in previously root canal-treated teeth with apical periodontitis.Istanbul Medipol Universit
Selective removal to soft dentine or selective removal to firm dentine for deep caries lesions ın permanent posterior teeth: a randomized controlled clinical trial up to 2 years
Full text linkOBJECTIVES: The aim of this randomized clinical trial was to compare selective removal to soft dentin (SRSD) and selective removal to firm dentin (SRFD) in permanent teeth. The primary outcome of the study was to compare the success rates of the two caries removal techniques. The secondary outcome of the study was to investigate whether or not calcium silicate-based material (CS) had an effect on the success rate of the treatment. MATERIALS AND METHODS: Between November 2018 and March 2020, patients with deep caries lesions were invited to participate in the study. Posterior teeth (N = 165) with primary caries lesion radiographically extending ¾ of dentin and positive response to cold test were randomly selected. A total of 134 participants meeting the inclusion criteria were randomized to SRSD and SRFD (control) groups. After the caries removal procedure, teeth with exposed pulps were assigned to the pulp exposure (PE) group, and the SRSD group was further divided into test 1 (with CS) and test 2 groups (without CS). Success was defined as a positive response to the cold test, a negative response to percussion, the absence of pain, an abscess, a fistula, and periapical alterations. Fisher–Freeman–Halton exact tests, Kaplan–Meier survival analysis, and the log-rank tests were performed for comparisons between groups. RESULTS: No statistically significant difference was found between the success rates of test 1 (100%) and test 2 (93.5%) groups, whereas the proportion of success in control (82.4%) and PE (84%) groups were significantly lower when compared with test groups (p = 0.024; p < 0.05) at the end of 2-year follow-up. CONCLUSIONS: SRSD had a higher success rate when compared to SRFD to treat deep carious lesions after 2 years of follow-up. The use of CS material after SRSD as a liner had no effect on the treatment outcome. CLINICAL RELEVANCE: SRSD with good coronal sealing might be recommended without CS application for the treatment of deep caries lesions in permanent teeth. TRIAL REGISTRATION: Clinical trial registration number NCT04052685 (08/09/2019)
Lisans Öğrencileri Tarafından Manuel Aletlere Karşı Döner Aletler Kullanılarak Gerçekleştirilen Kök Kanal Tedavisinin Teknik Kalitesi: Bir Retrospektif Çalışma
No full textBackground: The technical quality of root canal treatment (RCT) may impact on the outcome. The quality of education received during undergraduate school may be linked to the quality of treatment provided in general dental practice. Objective: To compare the technical quality of RCT where rotary or manual step-back canal preparatory technique was employed in an undergraduate dental clinic in Turkey. Additionally, the present study aimed to compare radiographically commonly seen complications in both instrumentation systems. Materials and Methods: Dental records of 270 patients who received RCT undertaken by dental students were investigated by retrospective chart review. 565 root canals belonging to 270 patients were randomized into two groups [(rotary, n=280, and manual hand instruments, n=285)]. Root canal obturation was evaluated on the basis of the length of obturation being >2mm from the radiographic apex, with uniform radiodensity and good adaptation to root canal walls. Inadequate root canal obturation included cases containing procedural errors such as perforation, ledge, transportation, instrument separation. Descriptive statistics were used to define categorical variables (n, %) and the level of significance was set at 0.05. Results: The technical quality of RCT performed by undergraduate dental students was classified as 'adequate' in 75% and 53.7% of the cases, respectively for rotary and manual groups, respectively (p < 0.05). The highest procedural errors were seen in molars. Occurrence of procedural errors differed significantly between the groups, being 6.4% in rotary group and 12.3% in manual group (p = 0.017). However, occurrence of ledge formation was higher in manual group than that of rotary group (p = 0.007). Conclusion: In view of our findings, RCT performed by undergraduate dental students using rotary instrumentation systems is of higher technical quality and also has fewer procedural errors than manual instrumentation.Giriş: Kök kanal tedavisinin (KKT) teknik kalitesi sonucu etkileyebilir. Lisans eğitimi sırasında alınan eğitimin kalitesi, genel dişhekimliği pratiğinde sağlanan tedavinin kalitesi ile bağlantılı olabilir. Amaç: Türkiye'deki bir lisans eğitimi veren diş kliniğinde döner veya manuel step-back kanal preparasyon tekniğinin kullanıldığı KKT teknik kalitesini karşılaştırmaktır. İlave olarak, bu çalışma, her iki şekillendirme sisteminde radyografik olarak sık görülen komplikasyonları karşılaştırmayı amaçlamıştır. Gereç ve yöntemler: Dişhekimliği öğrencileri tarafından KKT uygulanan 270 hastanın diş kayıtları geriye dönük çizelge ile incelendi. 270 diş 565 kök rastgele iki gruba [(Rotasyon, n=280&Manuel, n=285)] ayrıldı. Kök kanal dolumu, dolum uzunluğunun radyografik apeksten >2 mm olması, radyodensite ve kök kanal duvarlarına adaptasyon açısından değerlendirildi. Yetersiz kök kanal dolgusu, perforasyon, basamak, transportasyon, alet kırığı gibi işlemsel hataları içeriyordu. Kategorik değişkenleri (n,%) tanımlamak için tanımlayıcı istatistikler kullanıldı ve anlamlılık düzeyi 0.05 olarak belirlendi. Bulgular: Lisans diş hekimliği öğrencileri tarafından gerçekleştirilen KKT'nin teknik kalitesi, rotasyon ve manuel grupları için sırasıyla vakaların %75'inde ve %53.7’sinde 'yeterli' olarak sınıflandırıldı (p<0.05). En yüksek işlem hataları büyük azı dişlerinde görüldü. Genel olarak prosedürel hataların oluşumu gruplar arasında anlamlı farklılık bulundu, rotasyon grubunda %6.4 ve manuel grupta %12.3 idi (p = 0.017). Bununla birlikte, manuel grupta basamak oluşumunun meydana gelmesi, rotasyon grubuna göre daha yüksekti (p = 0.007). Sonuç: Bulgularımıza göre, lisans dişhekimliği öğrencileri tarafından döner enstrümantasyon sistemleri kullanılarak gerçekleştirilen KKT, daha yüksek teknik kaliteye sahiptir ve ayrıca manuel enstrümantasyondan daha az prosedür hatasına sahiptir
Türk toplumunda radyoopak çene lezyonlarının değerlendirilmesi: Retrospektif bir çalışma
Full text linkBackground: Radiopaque lesions are frequently found in the periapical region. The diagnosis and treatment of these lesions can be challenging to the dentist. The present study presents the similar radiographic features of the lesions to help the clinician narrow the differential diagnosis and to aid in treatment planning. This study aims to evaluate the frequency and distribution of radiopaque lesions in a Turkish population. Materials and Methods: This retrospective study was conducted at the Department of Endodontics, Hamidiye Faculty of Dentistry, University of Health Sciences Turkey, İstanbul, Turkey. Data was obtained from digital panoramic images taken between 2018-2021. A total of 2.002 patients were included. The incidence of specific radiopaque lesions, like idiopathic osteosclerosis, condensing osteitis, odontoma, cementoblastoma, cementoosseous dysplasia, and fibrous dysplasia was evaluated with relation to gender. In addition to these, the frequency of pulp stones was also evaluated. Descriptive statistics and the chi-square test were used to evaluate the data. Results: Of the 1.912 patients diagnosed with radiopaque lesions, 960 (50.2%) were female and 952 (49.8%) were male. Radiopaque lesions were determined on 106 (5.5%) panoramic radiographs. While idiopathic osteosclerosis was found in 58 (3%), condensing osteitis was found in 33 (1.7%), odontoma was found in 1 (0.1%), cementoblastoma was found in 1 (0.1%), cemento-osseous dysplasia was found in 10 (0.5%) and fibrous dysplasia was found in 3 (0.2%) patients. Moreover, a pulp stone was found in 142 (7.4%) patients. No statistically significant difference was found between genders in any of the lesions (p>0.05), except for condensing osteitis (X²=0.024). Conclusion: The most common radiopaque lesions in the study were idiopathic osteosclerosis and condensing osteitis, while the least common was cementoblastoma and odontoma.Amaç: Periapikal bölgede radyoopak lezyonlar sıklıkla bulunmaktadır. Bu lezyonların teşhisi ve tedavisi diş hekimi için zorlayıcı olabilir. Bu lezyonlar benzer görüntüleme özelliklerine sahip olabilir ve bu çalışmada klinisyenin ayırıcı tanıyı daraltmasına ve hasta tedavisini planlamasına yardımcı olmak için temel radyografik özellikler sunulmaktadır. Bu çalışmada, Türk popülasyonunda radyoopak lezyonlarının sıklığı ve dağılımının incelenmesi amaçlandı. Gereç ve Yöntemler: Radyoopak çene lezyonlarının bu retrospektif çalışması Türkiye’de Sağlık Bilimleri Üniversitesi, Hamidiye Diş Hekimliği Fakültesi Endodonti Anabilim Dalı’nda yapılmıştır. Veriler 2018’den 2021’e kadar dijital panoramik radyografi görüntülerinden alınmıştır. Toplam 2002 hasta dahil edilmiştir. Bu çalışmada cinsiyete ek olarak idiyopatik osteoskleroz, kondensing osteitis, odontoma, sementoblastoma, semento-osseöz displazi ve fibröz displazi gibi radyoopak lezyonların görülme sıklığı değerlendirildi. Bunlara ek olarak pulpa taşı sıklığı da değerlendirildi. Verilerin değerlendirilmesinde tanımlayıcı istatistikler ve ki- kare testi kullanıldı. Bulgular: Radyoopak lezyon tanısı alan 1,912 hastanın 960’ı (%50,2) kadın, 952’si (%49,8) erkekti. Yüz altı (%5,5) panoramik radyografide radyoopak lezyonlar tespit edildi. Elli sekizinde (%3) idiyopatik osteoskleroz, 33’ünde kondensing osteitis (%1,7), 1’inde odontoma (%0,1), 1’inde sementoblastoma (%0,1), 10’unda sementoosseoz displazisi (%0,5) ve 3’ünde fibröz displazi (%0,2) bulundu. Dahası 142’sinde pulpa taşı (%7,4) bulundu. Kondensing osteitis (X²=0,024) dışında hiçbir lezyonda cinsiyetler arasında istatistiksel olarak anlamlı fark bulunmadı (p>0,05). Sonuç: Çalışmada en sık radyoopak lezyonlar idiyopatik osteoskleroz ve kondens osteitis iken en az görüleni sementoblastoma ve odontoma idi
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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