Related Experiment Video
Updated: Apr 30, 2026
Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
Published on: August 22, 2022
Prevalence of impacted and supernumerary teeth among young Peruvians: A large cross-sectional study
Lilian Damián-Navarro1, Manuel Esquivel-Ortega1, Jhoana Mercedes Llaguno-Rubio2
1Division of Oral and Maxillofacial Radiology, Faculty of Dentistry, Centro Universitário do Norte de São Paulo (UNORTE), São Paulo, Brazil.
Background:
To determine the prevalence of impacted teeth (IT) and supernumerary teeth (ST) in young Peruvian individuals aged 13 to 20 years based on panoramic radiographs taken between 2020 and 2025. Materials and.
Material And Methods:
This cross-sectional and retrospective study complied with all ethical standards. Digital panoramic radiographs from two radiological centers in Peru (n = 7,903) were evaluated to analyze and detect the presence of impacted and supernumerary teeth. All DPRs were assessed by two previously trained and calibrated investigators. Chi-square tests and binary logistic regression analyses were used, with a significance level set at p < 0.05.
Results:
The study found a prevalence of impacted teeth (IT) of 58.7%, with no significant difference between sexes (p = 0.361). The prevalence of supernumerary teeth (ST) was 3.9% (males 5.5%, females 2.5%; p < 0.001). Single ST were observed in 68.9% of cases, with no sex-related differences (p = 0.195). No maxillary or mandibular predominance was found (p = 0.717); however, a higher frequency of ST was recorded in the posterior region (56.1%, p = 0.088) and of the supplemental type (51.9%), with no differences by sex (p = 0.185). Binary logistic regression analysis revealed a higher risk of ST in males (B = 2.28, p < 0.001), with no influence of age (p = 0.200). The most frequently impacted teeth were third molars (n = 3,579), followed by canines (n = 1,101) and incisors (n = 60).
Conclusions:
The prevalence of impacted teeth in young Peruvian patients was within the high range reported in the literature, with no significant differences by sex or age. Third molars were the most commonly impacted teeth, followed by canines. The prevalence of supernumerary teeth was within the average range reported in previous studies, being higher in males, predominantly single and located in the posterior region, with no age-related effect. Periodic radiographic evaluations during adolescence are recommended for early detection, as well as further research in young patients during the critical period of completion of permanent dental maturation.
Related Concept Videos
01:15Teeth
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
01:21Tooth Anatomy
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
01:26Assessment of the Mouth
Mouth Inspection
The inspection begins with visually examining the mouth for symmetry, color, and size.
01:08Prevalence and Incidence
Prevalence indicates the proportion of individuals in a population who have a specific disease or health...
01:28Development of the Oral Microbiota
01:11Oral Cavity
Teeth: The teeth are the hardest structures in our bodies. Humans have two sets of teeth throughout their lifetime: deciduous (baby) teeth and permanent teeth. Each tooth consists of several parts: the crown (visible part), the root (embedded in the jaw), enamel (hard outer...