A New Technique With Sodium Hypochlorite to Increase Bracket Shear Bond Strength of Fluoride-releasing Resin-modified Glass Ionomer Cements: Comparing Shear Bond Strength of Two Adhesive Systems With Enamel Surface Deproteinization Before Etching
Section snippets
Teeth
Seventy-six, freshly extracted, human premolars were collected, cleaned, and stored in distilled water at room temperature, a maximum of 6 months and a minimum of 3 days. To meet the criteria for use in the study, the teeth were selected only if they had intact buccal enamel, had not been pretreated with chemical agents (eg, H2O2), had no surface cracks from extraction forceps, and were caries-free. The premolars were randomly divided into 4 groups, (2 experimental and 2 control), with 19
Shear Bond Strength
The descriptive statistics, including mean, standard deviation, and minimum and maximum values for the 4 adhesive systems, are presented in Table 1.
The mean SBS for the brackets bonded using Transbond XT, with enamel deproteinization, was 9.41 ± 4.46 MPa, and the mean SBS for the brackets bonded using Transbond XT in the control group (without enamel deproteinization) was 8.12 ± 3.10 MPa.
The mean SBS for the brackets bonded using Fuji Ortho LC, with enamel deproteinization, was 9.64 ± 5.01 MPa,
Discussion
The present study evaluated 2 contemporary adhesive systems marketed for use to bond orthodontic brackets—a RMGI, Fuji Ortho LC, and a primer and/or composite resin system, Transbond XT. The main objective of the study was to determine whether NaOCl, applied for 1 minute before etching, increases bracket SBS.
By conditioning the enamel with 5.25% NaOCl, followed by a 30-second etching with 37% phosphoric acid, the present findings indicated that the mean SBS of brackets bonded using Fuji Ortho
Clinical Recommendations
Once Fuji Ortho LC liquid/powder has been mixed, the operator has less than a minute or two (depending on room temperature) to position the brackets before the adhesive begins to harden. This probably occurs due to the ambient light (as it is light-cured). It is therefore recommended to prepare adhesive for only 2 teeth at a time. NaOCl should also be applied to 2 teeth at a time. The saliva suction tip should be positioned in such a fashion as to suction away all NaOCl excess. As RMGIs take a
Conclusions
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Significantly greater bracket SBS can be obtained with Fuji Ortho LC if the enamel surface is wetted for 1 minute with 5.25% NaOCL, before etching.
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When 5.25% NaOCL is used to deproteinize the enamel surface, brackets bonded with Fuji Ortho LC have comparable SBS to brackets bonded with Transbond XT.
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With 5.25% NaOCL use, the ARI scores are similar when either Transbond XT or Fuji Ortho LC is used to bond brackets.
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Applying 5.25% NaOCL to the enamel surface eliminates the organic elements. This
Acknowledgments
The authors wish to express their gratitude to Dr. Jorge Guerrero from the Universidad Nacional Autónoma de México (Dental Materials Department) and to Ana Lilia Solis from the Instituto Nacional de Rehabilitación (Microscopy Department).
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Evaluation of enamel deproteinization in bond strength of orthodontic accessories: A split-mouth randomized clinical trial
2022, American Journal of Orthodontics and Dentofacial OrthopedicsEffects of enamel deproteinization with different application times on the shear bond strength of a self-etching primer: An in vitro study
2021, International OrthodonticsCitation Excerpt :Several methods of enamel surface preparations are proposed to increase SBS, such as sandblasting (air abrasion), laser application or enamel deproteinization with sodium hypochlorite [19,20]. Justus demonstrated that enamel deproteinization increases significantly the SBS of a resin-modified glass ionomer cement [21]. Furthermore, Espinosa et al. showed that the use of 5.25% sodium hypochlorite (NaOCl), for 1 minute before acid etching, deproteinized the enamel by eliminating its organic matter, resulting in an increased quality of the etching pattern [22,23].
Effect of sandblasting and enamel deproteinization on shear bond strength of resin-modified glass ionomer
2017, International Orthodontics