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    Prevalence of congenitally missing second premolars
    (Cumhuriyet University Faculty of Dentistry, 2010) Ezirganli, Seref; Hüseyin Koçger, H.; Ozer, Koray; Kirtay, Mustafa; Ün, Emin
    Purpose: The purpose of this study was to evaluate the prevalence and distribution of congenitally missing second premolars according to gender and localization. Materials and Methods: This study was performed on panoramic radiographs and clinical records of 7753 patients (4573 females and 3180 males) who referred to Oral and Maxillofacial Surgery Department from January 2000 to December 2009. A total of 52 cases with congenitally missing second premolars were detected. The cases were evaluated according to gender, localization, unilateral or bilateral of occurrence, and anomaly. Results: 70 congenitally missing second premolars in 52 cases (13 males and 39 females) were found on 7753 radiographs. The prevalence of congenitally missing second premolars was found 3 times higher in females than in males, 4 times higher in mandible than in maxilla. A congenital anomaly was not determined. Conclusion: In this study, the prevalence of congenitally missing second premolars was found to be as 0.67%.
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    The Prevalence of Impacted Premolars in the Anatolian Population
    (Aves, 2013) Ezirganli, Seref; Kirtay, Mustafa; Ozer, Koray; Un, Emin Celalettin; Kosger, Hasan Huseyin; Kazancioglu, Hakki Oguz
    Objective: The aim of this study was to determine the prevalence of impacted premolars and the associated pathology of these teeth in the Anatolian population. Methods: This retrospective cohort study was composed of 10246 panoramic radiographs of patients (6074 females, 4172 males) between 2000 and 2011. We reviewed the panoramic radiographs and clinical data and determined the prevalence of impacted premolars to be associated with sex, age, and number of premolars. We investigated the associated pathology and approach of treatment. Results: A total of 83 patients (43 females, 40 males; mean age 23.42 +/- 11.18 years, range 12 to 69) had 101 impacted permanent premolars that were either mesioangular (n=47, 46.54%), vertical (n=32, 31.68% 9), distoangular (n=14, 13.86%), horizontal (n=6, 5.94%), and/ or buccolingual (n=2, 1.98%). Premolar transmigration was absent. Of these premolars, 7 (6.93%) were associated with cystic lesions. In this study, 61.39% of impacted premolars were extracted; 39 (38.61%) were followed up. Conclusion: The prevalence of impacted premolars in the Anatolian population was determined to be 0.98%. Although premolar impaction is infrequent, early diagnosis is important because most of the cases (93.07%) are asymptomatic.