The onset of the symptoms was most frequent in spring and least frequent in the second half of the year (summer or autumn) in patients with sarcoidosis, Tuberculin anergy and a positive Kveim reaction. The significance of this finding in relation to aetiology and clinical utility needs to be further assessed.
Bu çalışmada, zaman serileri analizinde yaygın biçimde kullanılan Bayesci Vektör Oto-regresyon (BVAR) modeller ayrıntılı bir şekilde açıklanmıştır. Bu çerçeve içinde Vektör Oto-regresyon (VAR) modeller de incelenmiştir. Bilindiği gibi Türkiye, çok uzun zamandan beri yüksek enflasyon oranlarının yol açtığı sıkıntılarla uğraşmaktadır. Öyle ki yüksek enflasyon oranları Türkiye’nin en önemli sorunlarından biri haline gelmiştir. Bu faktörün önemi, bizi onu modellemeye yönlendirmiştir. Modelleme için iki ayrı dönem, Ocak 1986 - Aralık 2001 ve Ocak 1986 - Aralık 2000 seçilmiştir. Bu dönemler için yedi farklı BVAR modeli oluşturulmuş ve daha sonra 2002 ve 2001 yılları için bu modellerin öngörü performansları VAR modeller ile karşılaştırılmıştır. Sonuçlar incelendiğinde, BVAR modellerinin Ocak 2002 - Aralık 2002 döneminin
öngörüsünde VAR modeline oranla iyi bir performans sergileyemediği anlaşılmıştır. Bu duruma, 2001 yılında yaşanmış olan ekonomik krizin yol açtığı düşünüldüğünden, Ocak 1986 - Aralık 2000 dönemi için ayrı bir modellemeye gidilmiş ve Ocak 2001 - Aralık 2001 öngörülerine bakılmıştır. Çıkan sonuçlar BVAR modellerinin, VAR modeline göre 2001 yılı gerçek değerlerin tahmininde çok daha başarılı olduğunu kanıtlamıştır.
BACKGROUND
A healthy periodontium forms the basis of an aesthetic and functional dentition. Due to the reciprocal dynamic relationship between restorative dentistry and periodontal health, iatrogenic factors arising from restorative procedures are likely to have a negative effect on the periodontium. Awareness of these factors among dentistry students can lead to more progress in taking precautions and being careful against iatrogenic factors. Thus, the aim of this study was to evaluate failures in restorative treatments using panoramic radiographs as a graduation project.
METHODS
A total of 2622 PRs were randomly screened. After applying the exclusion criteria, 776 digital images containing at least one iatrogenic factor were analyzed. The measurement of the interrater agreement was calculated using Cohen's kappa coefficient.
RESULTS
This study included a sample size of 776 patients aged 18-85 years (435 females and 341 males). Most of the patients were in their 40s (27,45%). A total of 1662 treated teeth containing iatrogenic factors that may have possible negative effects on the periodontium were analyzed. Most of the teeth with improper restoration margins were more common in the maxillary molar region and also had bone loss. In addition, among the iatrogenic factors associated with endodontic treatment, inadequate root canal filling was observed the most, while perforation was the least. Interrater agreements were recorded at statistically significant levels of perfect, substantial and fair.
CONCLUSIONS
It is of great importance for dental students to increase their awareness by evaluating iatrogenic factors clinically and radiographically before graduation. Students also have the opportunity to test their knowledge, attitudes and skills that will be required after graduation, together with the academicians assigned to them as supervisors for the graduation projects.
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