Prevalencia de infraoclusión en molares primarios de niños de 7 y 8 años, Valdivia, Chile, 2019 / Prevalência de infraoclusão em molares decíduos de crianças de 7 e 8 anos, Valdivia, Chile, 2019 / Prevalence of infraocclusion in primary molars of children 7 and 8 years old, Valdivia, Chile, 2019

Objetivo: Determinar la prevalencia de infraoclusión en molares primarios de niños de 7 y 8 años, Valdivia, Chile. Materiales y métodos: Estudio descriptivo de corte transversal. Se examinaron niños de 7 y 8 años en establecimientos educacionales de Valdivia. Fue evaluada la presencia y severidad de infraoclusión en molares primarios utilizando la clasificación de Brearley & McKibben. Para establecer diferencias estadísticas entre sexo y presencia de infraoclusión fue realizada la prueba de chi-cuadrado. Además un análisis de ANOVA fue utilizado para establecer diferencias entre la localización de la infraoclusión y el grado de severidad. El nivel de significancia estadística se estableció con un valor de p<0,05. Resultados: Fueron evaluados 359 niños y un 41,78% presentó infraoclusión. Según grado de severidad, 82,06% fueron leves, 15,28% moderadas y 2,66% severas. No se encontraron diferencias significativas entre sexo y presencia de infraoclusión. Se evidenciaron diferencias estadísticamente significativas al evaluar localización y grado de severidad (p<0,05). Conclusión: Existe una alta prevalencia de infraoclusión en niños de 7 y 8 años en Valdivia, Chile.

Objective: To determine the prevalence of infraocclusion in primary molars of children aged 7 and 8 in Valdivia, Chile. Materials and methods: Descriptive cross-sectional study. Children aged 7 and 8 were examined in educational institutions in Valdivia. The presence and severity of infraocclusion in primary molars was evaluated using the Brearley & McKibben classification. The chisquare test was performed to establish statistical differences between sex and presence of infraocclusion. In addition, an ANOVA test was used to establish differences between infraocclusion location and degree of severity. The level of statistical significance was established at p <0.05. Results: Of 359 children evaluated, 41.78% had infraocclusion. As per degree of severity, 82.06% of cases were mild, 15.28% moderate and 2.66% severe. No significant differences were found between sex and presence of infraocclusion. Statistically significant differences appeared when assessing location and degree of severity (p <0.05). Conclusion: There is a high prevalence of infraocclusion in children aged 7 and 8 in Valdivia, Chile

Objetivo: Determinar a prevalência de infraoclusão em molares decíduos de crianças de 7 e 8 anos, Valdivia, Chile. Materiais e métodos: Estudo transversal descritivo. Crianças de 7 e 8 anos foram examinadas em estabelecimentos de ensino em Valdivia. A presença e gravidade da infraoclusão em molares decíduos foram avaliadas pela classificação de Brearley & McKibben. Para estabelecer diferenças estatísticas entre sexo e presença de infraoclusão, foi realizado o teste do qui-quadrado. Além disso, uma análise ANOVA foi usada para estabelecer diferenças entre a localização da infra-oclusão e o grau de gravidade. O nível de significância estatística foi estabelecido com um valor de p <0,05. Resultados: 359 crianças foram avaliadas e 41,78% apresentaram infra-oclusão. De acordo com o grau de gravidade, 82,06% eram leves, 15,28% moderados e 2,66% graves. Não foram encontradas diferenças significativas entre sexo e presença de infra-oclusão. Diferenças estatisticamente significantes foram evidenciadas na avaliação da localização e do grau de gravidade (p <0,05). Conclusão: Existe uma alta prevalência de infra-oclusão em crianças de 7 e 8 anos em Valdivia, Chile

Managements of ankylosed incisor occurred during adolescence using alveolar bone distraction osteogenesis and decoronation: case report

One of the common complications of dental injury is tooth ankylosis. Unlike adults, when tooth ankylosis occurs in the adolescents, ankylosis interfered the growth of the adjacent alveolar bone, resulting in the developmental failure of the alveolar bone and subsequent open bite. The most common treatment option for ankylosed tooth is extraction. However, when prognosis of ankylosed tooth after extraction is expected to be poor due to severity of infrapositioning or prosthetic replacement cannot be performed immediately, various treatment options should be considered. This report suggests multidisciplinary treatment that might bring functionally and esthetically favorable result included alveolar bone distraction osteogenesis and decoronation of ankylosed maxillary anterior tooth with orthodontic and prosthetic treatments.

Orthodontic treatment of an ankylosed tooth; application of single tooth osteotomy and alveolar bone distraction osteogenesis / 대한치과교정학회지

Tooth anklylosis is defined as the adhesion state of alveolar bone to dentin or cementum. Trauma, disturbed metabolic disease, and congenital disease have been given as etiologic factors. Complications of tooth ankylosis are tipping of the neighboring teeth, space loss, and supraeruption of the opposing teeth. Particularly if dental ankylosis occurs in maxillary incisors of a growing child, the ankylosed tooth can not move vertically with subsequent disturbance in vertical growth of the alveolar process. With an appropriate treatment approach, an esthetic condition must be achieved especially in the maxillary anterior region. In this report, two cases are presented which were treated by the surgical repositioning method. One is treated by alveolar bone distraction osteogenesis which used a tooth-borne type distraction device and the other by single tooth osteotomy.