Tooth loss and associated factors in adolescents ­ impact of extractions for orthodontic reason

Aim: To investigate tooth loss and its determinants in adolescents, considering the effect of extractions due to orthodontics reasons. Methods: This cross-sectional study was performed in students from public and private schools aged 15-19 years old from Passo Fundo, Brazil. The proportional randomly chosen sample included 736 adolescents. Clinical examinations and interviews were performed. Associations between prevalence of tooth loss and exposure variables studied were analysed by Poisson Regression with uni- and multivariate robust variance in two models. One model comprised students who had experienced tooth loss without orthodontic reasons and the other with all of the subjects presenting tooth loss. Results: Prevalence of tooth loss was 21.1% (mean of 0.42). Higher chances for tooth loss were found in the following features: non-whites (PR=1.72; CI95%:1.15-2.60), poorly schooling mothers (PR=2.2; CI95%:0.96-5.02), from public schools (PR=4.16; CI95%:0.98-17.59), smokers (PR=1.91; CI95%:1.15-3.17). Conclusion: Demographic, socioeconomic and behavioural conditions were strongly associated with tooth loss. These associations were more evident when extractions for orthodontic reasons were not included in the analytical models

A study on the prevalence of dental anomalies in Korean dental-patients / 대한치과교정학회지

OBJECTIVE: The purpose of this study was to investigate the prevalence of dental anomalies in outpatient clinics. METHODS: The subjects of this study were 3,133 patients who visited the clinic between January 2009 and June 2011. The dental records and panoramic films of the patients and detection of supernumerary, missing, and impacted teeth, transposition, and peg lateralis were reviewed. The results were analyzed according to gender and types and locations of dental anomalies. RESULTS: Among the patients, 362 had dental anomalies, with a prevalence rate of 11.55%. Congenital missing teeth (5.71%) ranked first in the categories, and impacted teeth (3.09%) ranked second. The percentage of patients having supernumerary teeth, peg lateralis, and dislocated teeth were 1.79%, 1.66%, and 0.45%, respectively. CONCLUSIONS: Congenital missing teeth and impacted teeth are, respectively, the first and second most common dental anomalies in Korean dental patients.

Factores de riesgo asociados a maloclusión en pacientes pediátricos / Associated risk factors in pediatric patients moloclusion

Determinar la correlación entre los factores de riesgo: pérdidas prematuras de dientes primarios, hábitos y alteraciones de número de dientes, con las maloclusiones diagnosticadas en un grupo de pacientes pediátricos. Se realizó el estudio descriptivo, retrospectivo, transversal y correlacional de 479 registros ortodóncicos del Servicio de Ortodoncia Interceptiva. La maloclusión se clasificó según Angle, modificación Dewey-Anderson; registrando la pérdida prematura de dientes primarios, la persistencia de hábitos parafuncionales y la presencia de alteraciones del número de dientes. Los datos fueron sometidos a pruebas estadísticas ?2 o Fischer, con nivel de significación p<0,05. La prevalencia de pérdidas prematuras fue 24,40%, hábitos 34,70%, y alteraciones del número de dientes 16,50%. Los resultados mostraron correlación estadísticamente significativa entre la presencia de hábitos y las maloclusiones Clase II, Clase I tipo 2, biprotrusión y normoclusión. Así mismo, entre las pérdidas prematuras y la maloclusión Clase I tipo 1, 3 y 5 y la Clase III tipo 3. Hubo independencia entre las alteraciones de número y el diagnóstico de maloclusión. Se observó prevalencia elevada de pérdidas prematuras, hábitos y alteraciones de número de dientes. La presencia de pérdidas prematuras y hábitos tiene correlación con las maloclusiones dentales diagnosticadas por lo que pueden considerarse factores de riesgo

To determine the correlation between premature loss of primary teeth, oral habits or tooth number anomalies, and dental malocclusion in a group of pediatric patients. A descriptive, retrospective, transversal, and correlation study was performed, using orthodontic records of 479 patients attending an Interceptive Orthodontics Clinic. Malocclusion was classified according to Angle´s criteria, considering the Dewey-Anderson modification. Premature loss of primary teeth, persistence of oral habits and alterations in the number of teeth were recorded. Data were analyzed using ?2 test or Fischer´s exact test (p<0,05). The prevalence of premature tooth loss was 24,40%, oral habits 34,70%, and tooth number anomalies 16,50%. Significant statistical positive correlation was noted between habits and Class II, Class I type 2, biprotrusion and normocclusion. Premature loss of primary teeth was correlated with Class I types 1, 3 and 5 and Class III type 3. Premature loss of primary teeth, oral habits and tooth number anomalies have high prevalence. Premature loss of primary teeth and oral habits have a positive correlation with diagnosed malocclusions and may be considered risk factors