The objective of this study was to estimate the prevalence of impacted teeth in a subpopulation of Brazilian patients based on the retrospective analysis of panoramic radiographs obtained at an oral radiology clinic. Out of 1,977 panoramic radiographs, 1,352 fulfilled inclusion criteria, and 22,984 teeth were assessed. Data were statistically analyzed using Kolmogorov-Smirnov's and Levene's tests; significance was set at 5%. The number of impacted teeth was assessed using analysis of variance and Tukey's post-hoc test. Our results showed significant differences for tooth type and patient age when analyzed separately (p < 0.05); gender did not show significant results (p > 0.05). Correlations between age and gender showed significant differences (p < 0.05), as did the correlations between age, gender and tooth type (p < 0.05). Mandibular molars were the teeth most frequently affected (p < 0.05), followed by maxillary molars (p < 0.05). Other tooth types did not present significant differences among themselves (p > 0.05). Patients aged 22 years or younger were the most frequent ones (p < 0.05). No significant differences were observed between age groups 37 and 51 years and 52+ (p > 0.05). According to the methodology here employed, gender did not affect tooth impaction, whereas age (22-36 years) and tooth type (mandibular third molars) strongly influenced results. How to cite this article Pedro FLM, Bandéca MC, Volpato LER, Marques ATC, Borba AM, de Musis CR, Borges AH. Prevalence of Impacted Teeth in a Brazilian Subpopulation. J Contemp Dent Pract 2014;15(2):209-213.

Neurofibromas (NF) are benign tumors with involvement of the peripheral nerve, which is not frequently located in the oral cavity, and especially, extraordinary rarity on lower lip of a child. This report describes a case of a NF on lower lip in a 12-year-old Brazilian child. NF consists of a wide variety of cell types, including Schwann cells, perineurial cells, and fibroblasts. Due to cellular heterogeneity, several hypotheses have been proposed to explain the histogenesis of this lesion. One of them, it support an origin of Schwannian, while others emphasize the participation of both Schwann cells and perineural cells. Excisional biopsy was performed to establish definitive diagnosis. Microscopically, the lesion was composed of interlacing bundles of elongated cells with wavy nuclei and small nerve fibers. Immunohistopathologic assessment showed cells positive for S-100, confirming the diagnosis of NF. No recurrence was observed after 1-year follow-up. Pediatric dentists must have a thorough knowledge of this unusual lesion.