Deproteinization of Fluorosed Enamel with Sodium Hypochlorite Enhances the Shear Bond Strength of Orthodontic Brackets: An Study.

CONTEXT

Improving bonding strength to fluorosed teeh.

AIMS

To determine the effect of deproteinization using 5.25% sodium hypochlorite (NaOCl) prior to acid etching on shear bond strength of orthodontic brackets bonded to fluorosed teeth.

SETTINGS AND DESIGN

experimental study.

METHODS AND MATERIAL

Forty freshly extracted human mandibular first premolars with TFI 4 were selected and divided into two groups of 20 each. In Group I the teeth were acid etched with 37% phosphoric acid and bonded with composite. In Group II the teeth were deproteinized with 5.25% NaOCl prior to acid etching with 37% phosphoric acid and were bonded with composite. Samples were then subjected to shear bond test by Instron Universal Testing machine. The sample from each group were selected for the SEM study (prior to bonding) to analyze the etching patterns achieved.

STATISTICAL ANALYSIS USED

Data was checked for normality by Shapiro Wilk Test, to compare the two groups unpaired t test was used. value was predetermined at ≤ 0.05.

RESULTS

The S BS of Group II (11.75 ± 2.83 MPa) was higher than Group I (7.44 ± 2.43 MPa) and the difference was statistically significant ( = 0.000). On SEM the etching pattern was more of type 1 and 2 in Group II.

CONCLUSIONS

Deproteinization using 5.25% NaOCl prior to acid etching significantly increases the shear bond strength of brackets bonded to fluorosed teeth and can be used as a convenient and effective option in orthodontic bonding to fluorosed teeth.