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This retrospective cone‐beam computed tomography study aimed to investigate the possible associations of apical periodontitis (AP) with missed/unmissed second mesiobuccal (MB2) canals. MB2 canals and AP were investigated in 257 endodontically treated and 673 untreated maxillary molars, and the former were analyzed regarding missed/unmissed MB2 canals. The chi‐squared test and odds ratio (OR) were used for statistics. The prevalence of MB2 canals in maxillary first molars was higher than that in second molars (p = 0.001). MB2 canals were 1.751 times more common in males than in females (OR: 1.751; 95% CI: 1.334–2.297), with a significant difference in the 18–39 age groups (p = 0.005). The risk for AP was 5.5 times greater in endodontically treated maxillary molars with missed MB2 canals than in those with unmissed MB2 canals (p = 0.012) (OR: 5.5, 95% CI: 1.549–19.527). The findings of this study reveal that the likelihood of the MB2 canal is higher in the maxillary first molars of young adult males.

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Çekilmemiş bir diş köküne eşlik eden reaktif kemik gelişimiÇene kemiklerinde en sık görülen kistler odontojenik kistlerdir. Radiküler kist periodontal aralıktaki Malassez epitel artıklarının devital bir dişe ait enflamasyon uyaranlarıyla kistik değişikliğe uğramasıyla oluşan bir kisttir. Radyolojik olarak çevresi belirgin sınırlı ve ortası radyolusenttir. Tanı konulması zor olmamakla birlikte bazen kesin radyolojik tanı için birden fazla görüntüleme yöntemi gerekebilir. Burada amaçlanan diş çekimi sonrası bırakılmış molar diş köküyle birlikte farklı bir lokasyonda görülen reaktif kemik gelişiminin eşlik ettiği radiküler kist vakasını sunmaktır. Anahtar sözcükler: Odontojenik kist, reaktif kemik gelişimi ABS TRACT Reactive bone development accompanying to an unextracted rootOdontogenic cysts are by far the most common cysts of the jaws. A radicular cyst is a cyst that most likely results when rests of Malassez epithelial cells in the periodontal ligament are stimulated to proliferate and undergo cystic degeneration by inflammatory products from a nonvital tooth. Radiographically, their periphery usually have a well-defined border and their internal structures are radiolucent. In order to make definite radiological diagnosis, more than one projection methods may be needed. The aim of this report is to present a case with an unusual location of radicular cyst caused by a molar root which was left after a tooth extraction procedure and accompanied by reactive bone development.