Prevalence and Pattern Occurrence of Supernumerary Teeth in the North-East Heilongjiang Population of China

Prevalence and presentation of hyperdontia in a non-syndromic, mixed Nigerian population

“…Of the 46 supernumerary teeth identified, most of them were distomolars (45.6%) occurring in the maxillary posterior segment of the jaws which is in agreement with more prevalent site of the jaws for distomolars as reported by Kara et al (30) in a Turkish population. However, this finding in our population is unconventional and is in contrast with the reports of Bratu et al (24), Schmuckli et al (22), Fidele et al (25), and Patil et al (2) in Western Romania, Switzerland, Turkey, north east China and north India respectively; all of whose findings were along the more popular notion that supernumerary teeth are more commonly mesiodentes or supplemental lateral incisors in the anterior region of the maxilla. Furthermore, our finding on the prevalent supernumerary tooth type and jaw location is in contrast with other findings by authors - Anibor et al (27) in south-south Nigeria and Al Muheiri et al (20) in a Northern Emirati population where mandibular predominance was reported in the incisor and premolar regions respectively.…”

“…An important reason for the use of panoramic radiographs to determine the prevalence of hyperdontia as opposed to clinical examination or analysis of health records solely is due to the non-eruptive nature of some supernumerary teeth which may lead to underestimation of the condition. Our study found that only 19.6% of supernumerary teeth were in occlusion with most being impacted either completely or partially which corroborates the earlier reports of Fidele et al (25) and Al Muheri et al (20). In contrast, this finding in not keeping with the reports of Bratu et al (24) where only 4% of the supernumerary tooth identified following clinical examination and radiographic analysis were impacted.…”

“…The single supernumerary tooth in these subjects was more on the left side of both jaws than the right or the midline with a ratio of 12.5:7:1 respectively. This finding based on the number of supernumerary teeth was in agreement with the reports of Al Muheiri et al (20) and Fidele et al (25) and may be adduced to the predominance of bilateral and multiple supernumerary teeth in individuals with other craniofacial or systemic congenital anomalies (6).…”

“…The prevalence of hyperdontia has been described in different populations; employing study designs with data collection via clinical examination of subjects, radiographic analysis or both. The reports of these authors have ranged from lower prevalence rates such as 0.75% in a Middle Eastern population (20), 1.0% in a Turkish population (21), and 1.5% in Swiss (22) and Southern Nigerian population (23) respectively to higher values between 3% - 12.5% in Western Romanian (24), South African (17), North Eastern Chinese (25) as well as South-west and South-south Nigerian populations (26-27). The prevalence of hyperdontia in our radiographic study is 1.74% which falls within the range of occurrence values, based on the observations of the aforementioned authors.…”

An Overview of Retrospective Studies on Distomolar Teeth in Turkish Population and 4 Case Reports

“…It is thought that they were present in the mouth of primitive humans and disappeared over time, but re-appear because of environmental or genetic factors, occur due to the continuation of the proliferation of dental laminae forming deciduous and permanent dentition to form the third tooth germ or as a result of the division of permanent tooth germ. [1,10,21] The rates in the population and the characteristics of supernumerary teeth vary according to the country where the research was conducted (0.38-02.8%) [22][23][24][25][26][27][28][29]. The differences in samples, age groups, ethnicity, and imaging techniques had effects on the prevalence differences [20].…”