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Abstract：
The persistent view in the literature is that the relative frequency of ameloblastomas is higher in the black population than in Caucasians. The aim of this study was to determine the relative frequency of all odontogenic tumours (OT) in a 100% black population and to compare our findings with those of previous studies. A prospective study was undertaken of all patients presenting with OT to all 16 Nigerian departments of oral and maxillofacial surgery over a 4-year period. The following data were obtained: patient demographics, delay to presentation, extent of the lesion, and histological diagnosis. Six hundred and twenty-two cases were studied. A slight male preponderance was observed (male to female ratio 1.17:1). Patients ranged in age from 5 to 89 years, with a peak incidence in the third decade. The relative frequency of OT was 0.99 per million and that of ameloblastoma was 0.76 per million. Ameloblastoma was the most prevalent OT (76.5%), followed by adenomatoid odontogenic tumours (5.6%), odontogenic myxoma (4.5%), and keratocystic odontogenic tumours (KCOT) (3.1%). The relative frequency of ameloblastoma among Nigerians was not different from frequencies reported previously among Caucasian and Tanzanian black populations. KCOTs were, however, rarely diagnosed in Nigerians as compared to the white population in the Western world.
摘要：
文献中的持续观点是，黑人人群中成釉细胞瘤的相对频率高于白种人。这项研究的目的是确定100％黑人人群中所有牙源性肿瘤（OT）的相对频率，并将我们的发现与以前的研究结果进行比较。在4年的时间里，对所有16个尼日利亚口腔颌面外科部门接受OT的所有患者进行了前瞻性研究。获得以下数据：患者人口统计学，延迟到演示，病变的范围，和组织学诊断。研究了62例。观察到轻微的男性优势(男女比例1.17:1)。患者年龄从5岁到89岁，发病率在第三个十年达到高峰。OT的相对频率为0.99/百万，成釉细胞瘤的相对频率为0.76/百万。成釉细胞瘤是最普遍的OT（76.5％），其次是腺瘤样牙源性肿瘤(5.6%)，牙源性粘液瘤(4.5%)，和角化囊性牙源性肿瘤（KCOT）（3.1％）。尼日利亚人成釉细胞瘤的相对频率与先前报道的高加索人和坦桑尼亚黑人的频率没有差异。KCOTs是，然而,与西方世界的白人相比，尼日利亚人很少被诊断出。
