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Caracterización microscópica de la dentina de dientes temporales / Microscopic characterization of the dentin of temporary teeth
Martínez Macal, Juan Carlos; Olín Moreno, Iván.
  • Martínez Macal, Juan Carlos; s.af
  • Olín Moreno, Iván; s.af
Rev. ADM ; 78(6): 314-331, nov.-dic. 2021. ilus, tab, graf
Article in Spanish | LILACS | ID: biblio-1354416
RESUMEN
La dentina se compone de un mineral de fosfato de calcio identificado como dahllita, que se dispone en pequeños cristales de hidroxiapatita carbonatada con dimensiones de 36 × 25 × 4 nm, y por una fase orgánica cuyo principal componente es el colágeno tipo 1 en 90%, que se orienta en forma de malla. Esta conformación corresponde a los dientes permanentes. Dentro de las estructuras, encontramos túbulos dentinarios que miden, aproximadamente, entre 0.5-1 µm de diámetro en la periferia y hasta 3-5 µm cerca de la pulpa. En el presente estudio, realizado en dentina de dientes temporales, el lumen de dichos túbulos es más grande cuando se encuentra cerca de la pulpa dental. Asimismo, se encontraron cambios elementales importantes de acuerdo con las diferentes profundidades en las que se observó, encontrando un aumento en el peso porcentual de carbono cuando se encuentra a mayor profundidad, lo que indica una composición orgánica mayor en la dentina pulpar. En estudios de dientes permanentes esta composición es disminuida y con mayor concentración en la dentina cercana a la unión amelodentinaria. En dentina de dientes temporales se encontraron diferencias en el recuento de túbulos dentinarios por mm2, comparado a la dentina de dientes permanentes, donde el número de túbulos no varía mucho (AU)
ABSTRACT
Dentin is composed of a calcium phosphate mineral identified as dahllite, which is arranged in small crystals of carbonated hydroxyapatite with dimensions of 36 × 25 × 4 nm, and by an organic phase whose main component is type l collagen in 90%, which is oriented in the form of a mesh. This conformation corresponds to permanent teeth. Within the structures, we find dentin tubules that measure approximately 0.5-1 µm in diameter at the periphery and up to 3-5 µm near the pulp. In the present study, carried out in dentin of primary teeth, the lumen of these tubules is larger when it is close to the dental pulp. Likewise, important elemental changes were found according to the different depths in which it was observed, finding an increase in the percentage weight of carbon when it is at a greater depth, indicating a greater organic composition in the pulp dentin. In studies of permanent teeth, this composition is decreased and with a higher concentration in the dentin near the amelodentinal junction. In dentin of primary teeth, differences were found in the count of dentin tubules per mm2, compared to dentin of permanent teeth, where the number of tubules did not vary much (AU)
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Tooth, Deciduous / Dentin / Dentinogenesis Type of study: Prognostic study Limits: Humans Language: Spanish Journal: Rev. ADM Journal subject: Dentistry / Orthodontics Year: 2021 Type: Article

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Full text: Available Index: LILACS (Americas) Main subject: Tooth, Deciduous / Dentin / Dentinogenesis Type of study: Prognostic study Limits: Humans Language: Spanish Journal: Rev. ADM Journal subject: Dentistry / Orthodontics Year: 2021 Type: Article