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Revista Cubana de Estomatología

Print version ISSN 0034-7507On-line version ISSN 1561-297X


CAYO ROJAS, César Félix  and  CRISTAL CARRILLO MARCOS, Annais Adely. Marginal sealing applying sodium hypochlorite versus phosphoric acid as dental conditioner. Rev Cubana Estomatol [online]. 2020, vol.57, n.1, e2872.  Epub May 20, 2020. ISSN 0034-7507.


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.


Evaluate the marginal sealing degree of Bulk Fill resin applying 10% sodium hypochlorite gel versus 37% phosphoric acid gel in in vitro dental conditioning.


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).


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.


The 10% sodium hypochlorite gel has similar marginal sealing effectiveness as the 37% phosphoric acid gel when used as dental conditioners.

Keywords : phosphoric acid; sodium hypochlorite; microfiltration.

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