Experience with 808-nm diode laser in the treatment of 47 cases of oral vascular anomalies.

Treatment of oral vascular anomalies (OVA) has focused on minimally invasive techniques rather than radical surgery. We investigated the efficacy and safety of diode laser using the photocoagulation technique in the management of OVA. Forty-seven subjects with OVA were treated with forced dehydration with induced photocoagulation (FDIP) using diode laser (808 nm/4.5 W). This series consisted mostly of male (63.8%) and non-white (63.8%) patients with a mean age of 57.4 years. Varices (91.5%), venous malformations (6.4%), and hemangiomas (2.1%) with a mean size of 7.1 (±4.9) mm were the conditions treated. OVA presented as a nodular lesion (63.8%) involving mainly the lower lip (46.8%). Pulsed laser mode was used as standard and the number of applications varied from one to four sessions, with the majority requiring only one (83%) FDIP session. Kaplan-Meier analysis revealed that complete clinical healing can occur on the 15th day (n=9/29.5%), followed by the 20th (n=6/45.5%), and 30th (n=7/70.5%) days. Postoperative edema was observed in 31 (66%) patients, and recurrence of the lesion occurred in two (4.2%). Based on the data on complete clinical healing, minimal patient discomfort, and satisfactory esthetic results, we can confirm that FDIP by diode laser is a promising candidate for the safe and efficacious treatment of OVA.

Oral conditions of children with microcephaly associated with congenital Zika syndrome: a cross-sectional study.

The aim of the present study was to compare the oral conditions of children with congenital Zika syndrome (CZS)-associated microcephaly, non-CZS-associated microcephaly, and normotypical children, as well as to characterize their sociodemographic aspects and medical history. A paired cross-sectional study was carried out on 14 children with CZS-associated microcephaly and 24 age-matched controls, in Belo Horizonte, in southeastern Brazil. Children's oral conditions were assessed: dental caries experience (dmft/DMFT indices); developmental defects of enamel (DDE) index; dental anomalies; mucosal changes; lip sealing, and malocclusion (overjet, overbite, and/or posterior crossbite alterations). The quality of oral hygiene was analyzed by the simplified oral hygiene index. The children's mothers also answered a questionnaire about sociodemographic and medical history data. The variables were analyzed descriptively. Female participants were more prevalent (60.5%), and the mean age of the participants was 4.9 years (±1.4) (range: 2-8 years) and 92.1% of their exhibited some oral condition. All participants with CZS-associated microcephaly showed absence of lip sealing and had malocclusion (100.0%). When compared to the other groups, children with CZS had a higher percentage of dental anomalies (35.7%), mucosal changes (71.4%), and unsatisfactory oral hygiene (64.3%). In a sample composed mainly of female participants aged less than 5 years, the prevalence of oral conditions and unsatisfactory oral hygiene was higher in the group with CZS-associated microcephaly, followed by the group with non-CZS-associated microcephaly. Normotypical children had the highest percentage of dental caries experience.

Oral conditions of children with microcephaly associated with congenital Zika syndrome: a cross-sectional study

Abstract The aim of the present study was to compare the oral conditions of children with congenital Zika syndrome (CZS)-associated microcephaly, non-CZS-associated microcephaly, and normotypical children, as well as to characterize their sociodemographic aspects and medical history. A paired cross-sectional study was carried out on 14 children with CZS-associated microcephaly and 24 age-matched controls, in Belo Horizonte, in southeastern Brazil. Children's oral conditions were assessed: dental caries experience (dmft/DMFT indices); developmental defects of enamel (DDE) index; dental anomalies; mucosal changes; lip sealing, and malocclusion (overjet, overbite, and/or posterior crossbite alterations). The quality of oral hygiene was analyzed by the simplified oral hygiene index. The children's mothers also answered a questionnaire about sociodemographic and medical history data. The variables were analyzed descriptively. Female participants were more prevalent (60.5%), and the mean age of the participants was 4.9 years (±1.4) (range: 2-8 years) and 92.1% of their exhibited some oral condition. All participants with CZS-associated microcephaly showed absence of lip sealing and had malocclusion (100.0%). When compared to the other groups, children with CZS had a higher percentage of dental anomalies (35.7%), mucosal changes (71.4%), and unsatisfactory oral hygiene (64.3%). In a sample composed mainly of female participants aged less than 5 years, the prevalence of oral conditions and unsatisfactory oral hygiene was higher in the group with CZS-associated microcephaly, followed by the group with non-CZS-associated microcephaly. Normotypical children had the highest percentage of dental caries experience.

Management of oral leukoplakia with an 808-nm high-power diode laser: a single-center experience.

PURPOSE: High-power diode laser emerges as a promising approach to the treatment of oral leukoplakia (OL); however, its short- and long-term effects have been barely explored. This study evaluated the postoperative endpoints and the recurrence rate of high-power diode laser treatment in a well-defined series of patients with OL. METHODS: A prospective analysis was performed on 22 individuals comprising 31 OL. The lesions were irradiated using the following protocol: Indium-Gallium-Arsenide diode laser, 808 nm, continuous-wave mode, 1.5-2.0 W, 780.0 ± 225.1 J, and 477.1 ± 131.8 s. Postoperative pain was assessed with a visual analog scale at three endpoints. Clinical follow-up was performed on all patients and the Kaplan-Meier test was used to analyze the probability of recurrence. RESULTS: The series consisted mostly of women (72.7%) with a mean age of 62.8 years. A single laser session was performed in 77.4% of cases. The median score on the scale that assessed pain on the 1st, 14th and 42nd postoperative day was 4, 1, and 0, respectively. The mean follow-up period per lesion was 28.6 months (range: 2-53 months). A complete response was observed in 93.5% of OL cases, while 6.5% had recurrence. The probability of recurrence at 39 months was 6.7%. No patient experienced malignant transformation. CONCLUSION: High-power diode laser for the treatment of OL is safe and effective during the trans- and postoperative period. These findings represent an alternative approach to the management of OL, mainly because a low recurrence rate was observed.

Oral alterations in children with microcephaly associated to congenital Zika syndrome: A systematic review and meta-analyses.

AIMS: To synthesize the oral alterations observed in children with microcephaly associated with congenital Zika virus syndrome (CZS), and to compare the oral alterations of these children to a normotypic healthy controls. METHODS AND RESULTS: A search was performed in six electronic databases. Observational studies published that reported oral alterations in children with CZS were selected. Two authors independently extracted data, assessed study quality, using the Joanna Briggs Institute Critical Appraisal Checklist tools, and the certainty of evidence, using Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach. Twenty-one studies were included in this systematic review and meta-analysis. The pooled crude occurrence showed 88% of increased salivation (95%CI: 82%-94%), 83% of biofilm (95%CI: 75%-91%), and 73% of bruxism (95%CI: 52%-95%). Compared to normotypic controls, children with CZS-associated microcephaly had a higher chance to have difficulty in lip sealing (OR: 18.28; 95%CI: 1.42-235.91), inadequate lingual posture at rest (OR: 13.57; 95%CI: 4.24-43.44), and delayed eruption (OR: 12.92; 95%CI: 3.42-48.78), with very low certainty. CONCLUSION: There are several oral alterations found among children with CZS-associated microcephaly. They are more prone to present some of these alterations, such as difficulty in lip sealing, although with very low certainty of evidence.

Condição clínica e imunológica da cavidade bucal de crianças com síndrome congênita associada à infecção pelo vírus Zika / Clinical and immunologic condition of the oral cavity of children with congenital syndrome associated to Zika virus infection

O objetivo deste estudo foi comparar a condição bucal e parâmetros imunológicos de crianças com Síndrome Congênita associada à infecção pelo vírus Zika (SCZ), com microcefalia não associada à SCZ e normotípicas em um estudo transversal. Além disso, objetivou-se sintetizar, por meio de uma revisão sistemática da literatura, as alterações orais observadas em crianças com SCZ e comparar com crianças normotípicas. No artigo de revisão sistemática, buscas eletrônicas foram realizadas em cinco bases de dados, complementadas por escrutínio manual e pesquisas na literatura cinzenta. Os dados foram agrupados para análise quantitativa com intervalos de confiança de 95%. A qualidade metodológica dos estudos incluídos foi avaliada por meio das ferramentas de avaliação do Joanna Briggs Institute e a certeza da evidência, pela abordagem GRADE. Doze estudos observacionais foram incluídos. A prevalência bruta combinada mostrou 88% de aumento de salivação (IC 95%: 82%- 94%) e 52% de inserção anormal do freio labial superior (IC 95%: 43%-61%). Em comparação com controles normotípicos, crianças com SCZ tiveram maior chance de ter dificuldade de selamento labial (OR: 18,28; IC 95%: 1,42-235,91) e inadequada postura lingual em repouso (OR: 13,57; IC 95%: 4,24-43,44), com certeza muito baixa. Diversas alterações orais foram encontradas e as crianças com SCZ se mostraram mais propensas a desenvolver algumas delas, entretanto, entretanto, a certeza dessas evidências ainda é muito baixa. O estudo transversal foi desenvolvido com dois grupos de comparação, pareados por idade e sexo. Foram convidadas a participar da pesquisa mães e crianças com microcefalia, associada ou não à SCZ, e crianças normotípicas atendidas na Faculdade de Odontologia (FAO) da UFMG. Amostragem do tipo snowball foi utilizada para expandir a amostra inicial. Para a coleta de dados, as mães responderam a um questionário estruturado sobre informações sociodemográficas, história médica e odontológica das crianças. Também foi realizado um exame bucal para investigação das seguintes condições: experiência de cárie dentária, qualidade da higiene bucal, alterações de mucosa, presença de má oclusão, selamento labial, anomalias dentárias e defeitos de desenvolvimento de esmalte. A coleta de saliva para avaliação dos parâmetros imunológicos/inflamatórios da cavidade bucal das crianças foi realizada através do uso de um rolete de algodão. Os dados coletados foram armazenados e analisados pelo software Statistical Package for Social Science (SPSS®). Um total de 38 crianças (14 com SCZ, oito com microcefalia não associada à SCZ e 16 normotípicas) foram avaliadas. O sexo feminino foi o mais frequente (60,5%, n=23) e a média de idade entre eles foi de 4,9 (±1,4; 2-8) anos. Ausência de selamento labial e má oclusão foram os achados mais comuns nas crianças com SCZ, quando comparadas aos grupos controle. Em conjunto, os dados deste estudo contribuirão para a compreensão das condições bucais que crianças com SCZ possuem ou podem desenvolver, a fim de direcionar práticas clínicas e reforçar o incentivo aos cuidados de saúde bucal possibilitando uma melhora na qualidade de vida dessa população.

The objective of this study was to compare the oral condition and immunological parameters of children with congenital syndrome associated with Zika virus infection (CZS), with children with microcephaly non-CZS-associated and normotypic children in a cross-sectional study. In addition, it was intended to synthesize, through a systematic review of the literature, the oral alterations observed in children with CZS and compare with normotypic children. In the systematic review article, electronic searches were performed in five databases, complemented by manual scrutiny and research in gray literature. The data were grouped for quantitative analysis with 95%confidence intervals. The quality of the included studies was assessed using the Joanna Briggs Institute Critical Appraisal Checklist tools, and the certainty of evidence was assessed using GRADE approach. Twelve observational studies were included. The pooled crude prevalence showed 88% of increased salivation (95%CI: 82%-94%), 52% of abnormal insertion of the upper labial frenum (95%CI: 43%-61%), and 50% of delayed tooth eruption (95%CI: 34%-66%). Compared to normotypic controls, children with CZS-associated microcephaly had a higher chance to have difficulty in lip sealing (OR: 18.28; 95%CI: 1.42-235.91), inadequate lingual posture at rest (OR: 13.57; 95%CI: 4.24-43.44), and delayed eruption (OR: 9.37; 95%CI: 2.03-43.21) with very low certainty. Several oral alterations were found and children with CZS-associated microcephaly were more likely to develop some of them, however, the certainty of this evidence is still very low. The cross-sectional study was carried out with two comparison groups, matched for age and sex. Mothers and children with microcephaly, associated or not with CZS, and normotypic children attended at the School of Dentistry of the UFMG were invited to participate in the research. Snowball sampling was used to expand the initial sample. For data collection, mothers responded to a structured questionnaire on sociodemographic information, medical and dental history of children. An oral examination was also performed to investigate the following conditions: experience of dental caries (dmft/DMFT), quality of oral hygiene (simplified oral hygiene index-SOHI), mucosa alterations, lip sealing, presence of malocclusion, dental anomalies and developmental defects of dental enamel (DDE). Saliva collection to evaluate the immunological/inflammatory parameters of the children's oral cavity was performed using a cotton roller. The collected data will be stored and analyzed using the Statistical Package for Social Science software (SPSS®). A total of 38 children (14 with CZS, eight with non-CZS-associated microcephaly and 16 normotypic) were evaluated. The female was the most frequent (60.5%, n=23) and the average age among them was 4.9 (±1.4; 2-8) years. Absence of lip sealing and malocclusion were the most common findings in children with SCZ when compared to control groups. Together, the data in this study will contribute to the understanding of the oral conditions that children with CZS have or can develop, in order to direct clinical practices and reinforce the incentive to oral health care enabling an improvement in the quality of life of this population.

Oral myiasis: Analysis of cases reported in the English literature from 1990 to 2020.

Myiasis is an infection caused by the deposition of fly larvae in tissues, and its involvement in the human oral cavity is uncommon. Herein, we have performed a data analysis of published cases of oral myiasis. A search was performed in PubMed, Ovid, Web of Science, Scopus, and LILACS. Geographic distribution, demographic data, associated factors, clinical features, fly types, treatment, and presence of sequelae were analyzed. A total of 122 articles reported the cases of 157 infected individuals. The most affected countries were India (41%) and Brazil (29.5%). Male predominance (67.5%) and a mean of 41.9 years of age were observed. The gingiva (29%) was the most affected site, followed by palate (25%) and lip (21%). There were different forms and combinations of treatments: manual removal of larvae and surgical debridement, application of asphyxiating substances, antibiotic therapy, and use of ivermectin. The condition predominantly affects individuals with neurological and/or locomotor disabilities, of low socioeconomic status, with poor oral hygiene and chemical dependence and individuals with previous injuries or with the absence of lip sealing. The establishment of a standard treatment protocol, enabling comparison in future studies and providing uniformity in treatment strategies offered by health services is strongly recommended.

Lingual Lymphangioma Ablation With High Power Diode Laser: A Case Report.

Introduction: Lymphangioma is a rare vascular anomaly that affects the lymphatic vessels. Its etiology is not yet clear and it usually occurs in the head and neck region. This pathology is commonly diagnosed in childhood and there is no consensus about the most effective treatment of it. Case Report: We report a case of lymphangioma located on the dorsum of the tongue in a 9-year-old boy, with the clinical appearance of small transparent vesicles similar to "frog-eggs". The diagnosis was defined according to the clinical aspect and ultrasound images. The treatment performed consisted of two sessions of ablation with a high-power diode laser. Conclusion: High-intensity diode laser ablation was a safe and effective tool for the treatment of this lesion in the tongue, which provided the patient with a faster, efficient transoperative period and a more comfortable postoperative period.

Demographic and Clinicopathologic Features of Actinic Cheilitis and Lip Squamous Cell Carcinoma: a Brazilian Multicentre Study.

Data on the occurrence and clinicopathological characteristics of actinic cheilitis (AC) and lip squamous cell carcinoma (LSCC) are well studied; however, they are based on studies limited to a single centre. Herein, we described the frequency of AC and LSCC submitted to microscopic examination from representative geographic regions of Brazil. A retrospective multicentre study was performed on biopsies obtained from 1953 to 2018 at 10 Brazilian oral and maxillofacial pathology centres. A total of 198,709 biopsy specimens were surveyed. Sociodemographic data and clinicopathologic characteristics were analysed. A total of 2017 cases of ACs (1.0%) and 850 cases of LSCCs (0.4%) were recorded. A strong fair-skinned (> 87%) male (> 70%) predilection was observed in both conditions. The mean age was 54.8 ± 18.7 for individuals with AC and 57.8 ± 19.0 for individuals with LSCC. The most commonly affected site was the lower lip (> 90%). This is a large multicentre study of AC and LSCC from Brazil. The frequency and clinicopathological features of AC and LSCC were similar to those described worldwide. This study provides robust and representative epidemiological data of these conditions for the scientific community.

Queilite actínica e carcinoma de células escamosas de lábio: um estudo multicêntrico / Actinic cheilitis and Lip squamous cell carcinoma: multicenter study

Este estudo investigou a frequência da queilite actínica (QA) e do carcinoma de células escamosas de lábio (CCEL) em diferentes regiões geográficas do Brasil realizando uma análise temporal dos casos por década. Também se estabeleceu o perfil dos pacientes e analisou os aspectos clínicos e histopatológicos. Em uma análise retrospectiva (1953-2018), arquivos de biópsias de 10 centros de Patologia Oral e Maxilofacial localizados em diferentes estados do Brasil: Pará, Rio Grande do Norte, Paraíba, Pernambuco, Rio Grande do Sul, Minas Gerais, Rio de Janeiro, São Paulo e Goiás foram analisados. O perfil da amostra, características clínicas e histopatológicas foram avaliados descritivamente e estatisticamente através dos testes qui-quadrado, ANOVA e t-Student utilizando o programa SPSS versão 23.0. Os laudos histopatológicos de QA e CCEL foram examinados de acordo com a classificação da Organização Mundial de Saúde (OMS) (2017). As análises estatísticas foram feitas utilizando o programa Dos 198.709 espécimes de biópsias, 2.017 casos de QA e 850 casos de CCEL foram avaliados, representando 1,0 e 0,4% das lesões orais, respectivamente. Em geral, indivíduos do sexo masculino (nQA=1.439, 71,4%; nCCEL=673, 79,3%), brancos (nQA=1.640, 87,3%; nCCEL=726, 91,3%), na sétima década de vida (nQA=570, 29,8%; nCCEL=222, 27,4%) com acometimento do lábio inferior (nQA=1.990, 98,7%; nCCEL=827, 97,3%) foram os mais afetados. Indivíduos fumantes e consumidores de álcool tiveram um maior grau de invasão nos casos de CCEL (p=0,004 e p=0,020) bem como indivíduos com história prévia de QA (p=0,018). A QA e o CCEL em estágios iniciais ainda são lesões subnotificadas no Brasil e negligenciadas por parte da população acometida. Novos dados sobre as características sociodemográficas e clinicopatológicas de 2.017 casos de QA e 850 casos de CCEL foram adicionados à literatura. Essa caracterização em um país tão grande e com tantas diferenças regionais como o Brasil fortalece evidências para clínicos, dermatologistas, estomatologistas e oncologistas e para o desenvolvimento de políticas públicas na prevenção dessas lesões na população brasileira.

This study investigated the frequency of actinic cheilitis (AC) and lip squamous cell carcinoma (LSCC) in different geographic regions of Brazil, making a temporal analysis of the cases per decade. It also established the profile of the patients with this lesion and analyzed the clinical and histopathological aspects. In a retrospective analysis (1953-2018), biopsy files of 10 Oral and Maxillofacial Pathology centers located in different states of Brazil: Pará, Rio Grande do Norte, Paraíba, Pernambuco, Rio Grande do Sul, Minas Gerais, Rio de Janeiro , São Paulo and Goiás were analyzed. The sample profile, clinical and histopathological characteristics were descriptively and statistically evaluated by chi-square, ANOVA and t-Student tests using the SPSS program version 23.0. Histopathological data of AC and LSCC were examined according to the World Health Organization (WHO) classification (2017). Of 198,709 specimens of biopsies analyzed, 2,017 cases of AC and 850 cases of LSCC were surveyed, representing 1.0 and 0.4% of the oral lesions, respectively. Overall, male patients (nAC=1,439, 71.4%; nLSCC=673, 79.3%), white (nAC=1,640, 87.3%; nLSCC=726, 91.3%), in their seventh decade of life (nAC = 570, 29.8%, nLSCC = 222, 27.4%) with involvement of the lower lip (nAC = 1.990, 98.7%, nLSCC = 827, 97.3%) were the most affected. Individuals smokers and alcohol users had a higher invasion grade in cases of LSCC (p=0.004 and p=0.020) as well as individuals with previous history of AC (p=0.018). The AC and the LSCC in early stage are still very underreported lesions in Brazil and neglected by the affected population. Novel data on the sociodemographic and clinicopathological features of 2,017 cases of AC and 850 cases of LSCC have been added to the literature. This characterization in such a large country and with so many regional differences as Brazil strengthens evidence for clinicians, dermatologists, stomatologists and oncologists and for the development of public policies for the prevention of these lesions in the Brazilian population.

A multicentre study of oral paracoccidioidomycosis: Analysis of 320 cases and literature review.

OBJECTIVES: To investigate the frequency of oral paracoccidioidomycosis from representative geographical regions of Brazil and to compare the data with a literature review. MATERIALS AND METHODS: A retrospective study was conducted on 108,304 biopsies obtained from 1953 to 2016 at six Brazilian oral and maxillofacial pathology services. Demographic data and clinical and histopathological diagnosis of oral paracoccidioidomycosis were evaluated. A literature review of oral paracoccidioidomycosis studies published in three electronic databases was carried out. Data were analysed descriptively. RESULTS: A total of 320 cases of oral paracoccidioidomycosis were surveyed (0.3% of the oral lesions at the centres studied). The lesions were more frequent among male patients. The gingiva/alveolar ridge was the most affected site. Mean age of affected individuals was 51.3 years (±11.7). The literature review showed a higher incidence of oral paracoccidioidomycosis in the south-east and south regions of Brazil. Male individuals and individuals between 50 and 59 years were most affected. CONCLUSIONS: Oral paracoccidioidomycosis is an uncommon lesion observed in oral biopsy samples. The differences in the relative frequency of oral paracoccidioidomycosis are related to geographical variations. Men between 50 and 59 years are more affected. This study provides helpful information for clinicians in the diagnosis of oral paracoccidioidomycosis.

A multicenter study of biopsied oral and maxillofacial lesions in a Brazilian pediatric population.

The aim of this study was to investigate the prevalence of oral and maxillofacial lesions among children from representative regions of Brazil. A retrospective descriptive study was conducted. Biopsy records comprising the period from 2000 to 2015 were obtained from the archives of three Brazilian oral pathology referral centers. A total of 32,506 biopsy specimens were analyzed, and specimens from 1,706 children aged 0-12 years were selected. Gender, age, anatomical location and histopathological diagnosis were evaluated. Descriptive statistics was carried out. Likelihood ratio tests were used to evaluate the association between the categorical variables. The level of significance was set at 0.05. The post-hoc test was used to identify the subgroups that significantly differed from one another, and the Bonferroni correction was applied. A total of 1,706 oral and maxillofacial lesions were diagnosed in pediatric patients, including 51.9% girls. Oral mucocele was the most prevalent reactive/inflammatory lesion (64%). The most commonly affected sites were the lips (34.5%) and mandible (19.9%). A significant association was observed between age and the group of lesions of the oral cavity (p < 0.001), and between age and anatomical location (p < 0.001). Pediatric oral and maxillofacial lesions were frequent and showed wide diversity, with the prevalence of mucocele. Knowledge of oral lesions is important for pediatric dentists worldwide, since it provides accurate data for the diagnosis and oral health of children.

A multicenter study of biopsied oral and maxillofacial lesions in a Brazilian pediatric population

Abstract The aim of this study was to investigate the prevalence of oral and maxillofacial lesions among children from representative regions of Brazil. A retrospective descriptive study was conducted. Biopsy records comprising the period from 2000 to 2015 were obtained from the archives of three Brazilian oral pathology referral centers. A total of 32,506 biopsy specimens were analyzed, and specimens from 1,706 children aged 0-12 years were selected. Gender, age, anatomical location and histopathological diagnosis were evaluated. Descriptive statistics was carried out. Likelihood ratio tests were used to evaluate the association between the categorical variables. The level of significance was set at 0.05. The post-hoc test was used to identify the subgroups that significantly differed from one another, and the Bonferroni correction was applied. A total of 1,706 oral and maxillofacial lesions were diagnosed in pediatric patients, including 51.9% girls. Oral mucocele was the most prevalent reactive/inflammatory lesion (64%). The most commonly affected sites were the lips (34.5%) and mandible (19.9%). A significant association was observed between age and the group of lesions of the oral cavity (p < 0.001), and between age and anatomical location (p < 0.001). Pediatric oral and maxillofacial lesions were frequent and showed wide diversity, with the prevalence of mucocele. Knowledge of oral lesions is important for pediatric dentists worldwide, since it provides accurate data for the diagnosis and oral health of children.

A multicenter study of malignant oral and maxillofacial lesions in children and adolescents.

OBJECTIVES: To investigate the frequency of malignant oral and maxillofacial lesions among children and adolescents from representative geographic regions of Brazil. MATERIALS AND METHODS: A retrospective study was conducted on biopsies obtained from 1990 to 2016 at six Brazilian oral and maxillofacial pathology referral centers. A total of 85,105 biopsy specimens from children and adolescents were analyzed. Gender, age, anatomical location, symptomatology and histopathological diagnosis were evaluated. Data were analyzed using descriptive statistical methods. RESULTS: Fifty-eight (0.06%) malignant oral and maxillofacial lesions were diagnosed in children (19%) and adolescents (81%). The lesions were more frequent among females (60.3%) and adolescents. The most prevalent lesions were mucoepidermoid carcinomas (22.4%), osteosarcomas (13.8%), squamous cell carcinomas (12.1%), and Burkitt's lymphomas (12.1%). The most commonly affected sites were the palate (19%), mandible (13.8%), and maxilla (13.8%). Almost half the patients were asymptomatic. CONCLUSION: Pediatric oral and maxillofacial malignant lesions were infrequent and showed wide diversity, with a prevalence of mucoepidermoid carcinomas. Analysis of malignant lesions in children and adolescents helps pediatric dentists and oncologists to obtain a better understanding of such lesions and to reduce the time for diagnosis, with a consequent improvement of prognosis.