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espanolEste estudio evaluo la prevalencia y el patron de erupcion de terceros molares mandibulares impactados (TMMI), y la influencia de su estado de erupcion en la caries distal de los segundos molares mandibulares (SMM) mediante tomografia computarizada de haz conico (TCHC). Material y metodos: se analizaron retrospectivamente las imagenes de TCHC tomadas para diferentes fines en practicas dentales privadas. La evaluacion radiografica incluyo: prevalencia de TMMI, grado de angulacion, nivel de impacto y tipo de TMMI. Ademas, tambien se evaluo la distancia entre la union amelocementaria (UAC) de los segundos y terceros molares y la aparicion de lesion de caries en la superficie distal de SMM. Los datos se analizaron mediante la prueba de chi cuadrado y se uso la regresion logistica para evaluar asociaciones entre la caries distal de SMM y el estado de erupcion de TMMI. Resultados: Se examinaron 308 TCHC, la prevalencia de TMMI fue de 36.88% y su grado de angulacion fue mayoritariamente menor a 90o (mesioangular). Entre aquellos con impacto, 58 sujetos (43%) tenian caries distales en los SMM, 29.6% eran mujeres y 30.4% pertenecieron al grupo de edad de 19-27 anos. Las caries en el lado distal de MSM se asociaron significativamente con la edad, el nivel y el tipo de impactacion, el grado de angulacion y las distancias UAC (p EnglishThis study evaluated the prevalence and eruption’s pattern of impacted mandibular third molars (IMTM) and the influence of their eruption status on the distal caries of mandibular second molars (MSM) using cone-beam computed tomography (CBCT). Material and methods: CBCT images taken for different purposes in private dental practices were analyzed retrospectively. Radiographic assessment included: prevalence of IMTM, degree of angulation, level of impaction and type of IMTM. Furthermore, the distance between the cement-enamel junctions (CEJ) of second and third molars and the occurrence of caries lesion on the distal surface of MSM was also evaluated. Data were analyzed by chi square test and logistic regression was used to find the association between distal caries of MSM and eruption status of IMTM. Results: Three hundred and eight CBCTs were screened, the prevalence of IMTM was 36.88% and their angulation degree were mostly less than 90o (mesioangular). Amongst those with impaction, 58 subjects (43%) had distal caries on MSM, 29.6% in females and 30.4% in the age group 19-27 years. Caries on the distal side of MSM were significantly associated with age, level and type of impaction, angulation degree and CEJ distances (p

Prevalence of impacted mandibular third molars and its association with distal caries in mandibular second molars using cone beam computed tomography