Sellado marginal aplicando hipoclorito de sodio versus ácido fosfórico como acondicionador dental
Date
2020-05-02
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Abstract
Introducción: La microfiltración es uno de los problemas principales de todas las
obturaciones a base de resina. Muchos estudios buscan optimizar un buen sellado
marginal utilizando diversos acondicionadores, como el hipoclorito de sodio, que
permite que el adhesivo penetre bien, al generar desproteinización, y el ácido fosfórico
que permite remover el barro dentinario, y así de esta manera formar una capa híbrida
al colocar el adhesivo. Objetivo: Evaluar el grado de sellado marginal de la resina Bulk
Fill aplicando gel de hipoclorito de sodio 10 % comparado con el gel de ácido fosfórico
al 37 % en el acondicionamiento dental in vitro. Métodos: El universo fue de 72 dientes
con cavidades clase I; se separaron en 4 grupos por muestra de 18 dientes cada uno;
después de obturar se realizó el termociclaje a 500 ciclos entre 5 °C a 55 °C; luego se
sumergieron en azul de metileno 2 %, durante 12 h y 24 h a temperatura de 37 °C.
Finalmente se evaluó el sellado marginal en el estereomicroscopio, según el ISO / TS
11405: 2015, con los criterios siguientes: grado 0 (sin microfiltración), grado 1
(microfiltración hasta esmalte), grado 2 (microfiltración hasta dentina) y grado 3
(microfiltración hasta piso pulpar). Resultados: El acondicionamiento con ácido
fosfórico 37 % a las 12 h presentó grado 0 (55,6 %) y grado 1 (33,3 %), y a las 24 h, grado 1 (55,6 %). Con respecto al hipoclorito de sodio 10 % a las 12 h, grado 0 (44.4%)
y a las 24 h predominó grado 1 (55,6 %). Para la contrastación de hipótesis en
muestras relacionadas se obtuvo en ácido fosfórico 37 % e hipoclorito de sodio al 10
% a las 12 h y 24 h un p= 0,052 y p= 0,584, respectivamente. Para comparaciones
entre muestras independientes a las 12 h y 24 h se obtuvo p= 0,462 y p= 0,406,
respectivamente. Conclusiones: El gel de hipoclorito de sodio al 10 % presenta similar
eficacia en el sellado marginal respecto al gel de ácido fosfórico al 37 %, al utilizarlo
como acondicionador dental.
Introduction: Microfiltration is one of the main problems of all resin sealings. Many studies aim to optimize marginal sealing using a variety of conditioners, such as sodium hypochlorite, which allows good penetration of the adhesive by generating deproteinization, and phosphoric acid, which allows removal of the dental smear layer, thus creating a hybrid layer when the adhesive is placed. Objective: Evaluate the marginal sealing degree of Bulk Fill resin applying 10% sodium hypochlorite gel versus 37% phosphoric acid gel in in vitro dental conditioning. Methods: The study universe was 72 teeth with class I cavities, divided into four groups of 18 teeth. Upon sealing, thermal cycling was performed at 500 cycles from 5 ºC to 55 ºC. Next the teeth were submerged in 2% methylene blue for 12 h and 24 h at a temperature of 37 ºC. Finally marginal sealing was evaluated in the stereo microscope according to ISO / TS 11405: 2015, using the following scale: grade 0 (no microfiltration), grade 1 (microfiltration as far as the enamel), grade 2 (microfiltration as far as the dentin), and grade 3 (microfiltration as far as the pulp floor). Results: Conditioning with 37% phosphoric acid was grade 0 (55.6%) and grade 1 (33.3%) at 12 h, and grade 1 (55.6%) at 24 h, whereas conditioning with 10% sodium hypochlorite was grade 0 (44.4%) at 12 h, and predominantly grade 1 (55.6 %) at 24 h. Hypothesis contrast in related samples yielded 37% phosphoric acid and 10% sodium hypochlorite at 12 h and 24 h, p= 0.052 and p= 0.584, respectively. Comparison between independent samples at 12 h and 24 h yielded p= 0.462 and p= 0.406, respectively. Conclusions: The 10% sodium hypochlorite gel has similar marginal sealing effectiveness as the 37% phosphoric acid gel when used as dental conditioners.
Introduction: Microfiltration is one of the main problems of all resin sealings. Many studies aim to optimize marginal sealing using a variety of conditioners, such as sodium hypochlorite, which allows good penetration of the adhesive by generating deproteinization, and phosphoric acid, which allows removal of the dental smear layer, thus creating a hybrid layer when the adhesive is placed. Objective: Evaluate the marginal sealing degree of Bulk Fill resin applying 10% sodium hypochlorite gel versus 37% phosphoric acid gel in in vitro dental conditioning. Methods: The study universe was 72 teeth with class I cavities, divided into four groups of 18 teeth. Upon sealing, thermal cycling was performed at 500 cycles from 5 ºC to 55 ºC. Next the teeth were submerged in 2% methylene blue for 12 h and 24 h at a temperature of 37 ºC. Finally marginal sealing was evaluated in the stereo microscope according to ISO / TS 11405: 2015, using the following scale: grade 0 (no microfiltration), grade 1 (microfiltration as far as the enamel), grade 2 (microfiltration as far as the dentin), and grade 3 (microfiltration as far as the pulp floor). Results: Conditioning with 37% phosphoric acid was grade 0 (55.6%) and grade 1 (33.3%) at 12 h, and grade 1 (55.6%) at 24 h, whereas conditioning with 10% sodium hypochlorite was grade 0 (44.4%) at 12 h, and predominantly grade 1 (55.6 %) at 24 h. Hypothesis contrast in related samples yielded 37% phosphoric acid and 10% sodium hypochlorite at 12 h and 24 h, p= 0.052 and p= 0.584, respectively. Comparison between independent samples at 12 h and 24 h yielded p= 0.462 and p= 0.406, respectively. Conclusions: The 10% sodium hypochlorite gel has similar marginal sealing effectiveness as the 37% phosphoric acid gel when used as dental conditioners.
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Keywords
ácido fosfórico, hipoclorito de sodio, microfiltración, phosphoric acid, sodium hypochlorite, microfiltration