Читать книгу Shear's Cysts of the Oral and Maxillofacial Regions - Paul M. Speight - Страница 35

Radicular and residual cysts are by far the most common cystic lesions of the jaw bones, probably accounting for more than half of all cystic lesions and about 60% of odontogenic cysts. In an analysis of nearly 10 000 radiolucent jaw lesions, Koivisto et al. (2012 ) found that 73% were periapical granulomas or cysts. Of these, 40.4% were granulomas and 33.0% were cysts.

In Shear's South African series, radicular and residual cysts comprised 52.2% of cystic jaw lesions (Table 1.1) and 62% of odontogenic cysts. This is similar to the frequency in a Sheffield study (Jones et al. 2006 ), where 4297 radicular and residual cysts were diagnosed over a 30‐year period, representing 60.3% of all odontogenic cysts (Table 1.2).

Data from other countries vary (Table 1.3), with a range from 42.1% in Mexico (Mosquedo‐Taylor et al. 2002 ) to 84.5% in Sicily (Tortorici et al. 2008). The reason for the global variation in frequency is not clear, but probably relates to variations in the prevalence of dental caries and to methods of data collection. For example, in Mexico Mosquedo‐Taylor et al. (2002 ) suggest that the low frequency is due to a large proportion of their studied population being treated in the private sector where caries is less prevalent. Conversely, Tortorici et al. (2008) believed that the high frequency in Sicily was related to a high prevalence of caries in the studied population. The low frequency in Iran was ascribed to the fact that caries and periapical lesions are common and are not routinely submitted for histological diagnosis (Sharifian and Khalili 2011 ). Overall, however, these data show that radicular (including residual) cysts are consistently the most common cystic lesion of the jaws, with a frequency of about 60%.

In presenting these data, radicular and residual cysts have been included together, but where the information is stated, almost all the studies show that residual cysts account for between 5% and 15% of odontogenic cysts and between 10% and 20% of radicular cysts (Mosquedo‐Taylor et al. 2002 ; Jones et al. 2006 ; Sharifian and Khalili; 2011 ; Soluk Tekkeşin et al. 2012b ; Lo Muzio et al. 2017 ; Tamiolakis et al. 2019 ; Kammer et al. 2020 )