Root and canal morphology of mandibular premolars using cone-beam computed tomography in a Chilean and Belgian subpopulation: a cross-sectional study.

OBJECTIVE: To describe mandibular premolar root and canal morphology and its variability in Chilean and Belgian samples using cone-beam computed tomography. METHODS: A cross-sectional and descriptive study was conducted. A total of 402 mandibular premolars were examined using cone-beam computed tomography images of Chilean and Belgian patients. Premolars that met the inclusion criteria were studied in relation to the number of roots, number of canals, root canal configuration, presence of C-shaped configuration, tooth length, and root length. RESULTS: The mandibular first premolar frequently presented with one root (94% Chilean; 100% Belgian), as did the mandibular second premolar (99% Chilean; 98% Belgian). One canal was present in 69% of Chilean, and 83% of Belgian mandibular first premolars, and in 95% of Chilean and 91% of Belgian second premolars. A type I root canal configuration was found in 69% of Chilean and 83% of Belgian first premolars and in 95% of Chilean and 92% of Belgian second premolars. CONCLUSIONS: The anatomical parameters analyzed in the Chilean and Belgian samples are similar. However, it should be noted that there are anatomical variations in mandibular premolars.

Evaluación de anchos intercaninos e intermolares en escolares con dentición mixta, Comuna de Contulmo, Chile / Evaluation of intercanine and intermolar widths in students with mixed dentition, Contulmo Commune, Chile

Introducción: El éxito del tratamiento ortodóncico temprano se fundamenta en el conocimiento del desarrollo de la dentición, por lo cual la medición de susdimensiones en los diferentes estadios de desarrollo se considera como un factor predictor para el tratamiento y rehabilitación de la población. Objetivo: Conocer y evaluar las características cuantitativas de los anchos intercaninos e intermolares según sexo en la población de niños de 6 a 8 años de la Escuela Artística San Luis de Contulmo.Metodología: Estudio cuantitativo, no experimental, de corte transversal, descriptivo y correlacional. La población de estudio correspondió a 48 alumnos de 6 a 8 años seleccionados por muestreo por conveniencia, a los cuales se les tomó modelos de estudio, midiendo y comparando los anchos intercaninos e intermolares. Resultados: Los promedios resultantes de las mediciones efectuadas fueron: distancia intercanina maxilar 33,2 +/-2,6 mm en hombres y 32,2 +/-2,3 mm en mujeres, respectivamente la distancia intercanina mandibular 27,1 +/-2,3 mm y 26, 6 +/-1,9 mm, la distancia intermolar maxilar 51,9 +/-3,1 y 51,2 +/-3,0 mm y la distancia intermolar mandibular 46 +/-2,6 y 44,8 +/-3,0 mm. Conclusión: Las diferencias entre los anchos intercaninos e intermolares según sexo no son significativas, en cuanto a la edad se observan diferencias significativas entre los 6 y 8 años en el sexo masculino, no así en el femenino. Este estudio representa un interesante punto de partida para el análisis y discusión de futuras investigaciones.

Introduction: The early orthodontic treatment success is based on knowledge the development of the dentition, so measuring their dimensions at different stages of development is considered as a predictor for treatment and rehabilitation of the population. Objective: To explore and evaluate the quantitative characteristics of intercanine and intermolar widths by sex in the population of children of 6-8 years of the Escuela Artistica San Luis de Contulmo. Methodology: quantitative study, non-experimental, cross-sectional, descriptive and correlational. The study population corresponded to 48 students from 6 to 8 years selected by probabilistic sampling, unintentional and opportunistic, to which took study models, measuring and comparing intercanine and intermolar widths. Results: The resulting averages of measurements were: maxillary intercanine 33.2 +/-2.6 mm in men and 32.2 +/-2.3 mm in women, mandibular intercanine distances respectively 27.1 +/- 2.3 mm and 26 6 +/-1.9 mm, the distance intermolar maxillary 51.9 +/-3.1 and 51.2 +/-3.0 mm and the distance mandibular intermolar 46 +/-2.6 and 44.8 +/-3.0 mm. Conclusion: In relation to the difference between intercanine and intermolar widths by sex are not significant, in terms of age significant differences between 6 and 8 males but not in females. This study represents an interesting starting point for the analysis and discussion of future research.