Effect of Bleaching with Strawberry Extract and Hydrogen Peroxide on Colour Change, Surface Morphology and Micro-Shear Bond Strength of Resin Composite to Enamel Surface
Published: March 1, 2021 | DOI: https://doi.org/10.7860/JCDR/2021/47070.14601
Rajith Radhakrishnan, Ravikumar Nesamani, Kavitha Sanjeev, Mahalaxmi Sekar
1. Postgraduate Student, Department of Conservative Dentistry and Endodontics, SRM Dental College and Hospital, Chennai, Tamil Nadu, India.
2. Reader, Department of Conservative Dentistry and Endodontics, SRM Dental College and Hospital, Chennai, Tamil Nadu, India.
3. Professor, Department of Conservative Dentistry and Endodontics, SRM Dental College and Hospital, Chennai, Tamil Nadu, India.
4. Head, Department of Conservative Dentistry and Endodontics, SRM Dental College and Hospital, Chennai, Tamil Nadu, India.
Correspondence
Kavitha Sanjeev,
Professor, Department of Conservative Dentistry and Endodontics, SRM Dental
College and Hospital, Bharathi Salai, Ramapuram, Chennai, Tamil Nadu, India.
E-mail: researchkavi02@gmail.com
Introduction: The search to replace the chemical bleaching agent namely the Hydrogen Peroxide (HP) with a natural substance to whiten the discoloured tooth is a need of the hour, due to the severe roughing and compromised bonding of resin composite to enamel surface by this agent.
Aim: To evaluate and compare the colour and surface changes in enamel surface, and the micro-shear bond strength of resin composite to enamel following bleaching with 35% HP and 2% Strawberry Extract (SE).
Materials and Methods: In this in-vitro study, 30 bovine maxillary central incisors were decoronated and allocated randomly to two groups: group 1 (negative control) (n=15) and group 2 (experimental) (n=15). To evaluate the bleaching efficacy, group 2 specimens were experimentally stained with tea. Baseline colour coordinates (pre-bleach values) (L*, a*, b*) (∆E) were recorded. The crowns were sectioned to obtain four equal parts to obtain 60 specimens and these were allotted randomly to 4 subgroups a, b, c, d (n=15 each) based on the bleaching protocol. Subgroup a, Hydrogen Peroxide (HP). subgroup b, Strawberry Extract (SE); subgroup c, HP+SE (HPS); subgroup d, HP/P (HP/ Proanthocyanidin). Following bleaching, colour coordinates (post-bleach values) (L*, a*, b*) (∆E) were measured as mentioned before. Qualitative analysis of the surface (n=2) for each group was performed using scanning electron microscopy. Micro-shear bond strength of resin composite to the treated specimens (n=13) was determined using universal testing machine at a crosshead speed of 1 mm/min. Kruskal-Wallis one-way Analysis of Variance (ANOVA) was used to calculate the p-value and Post-Hoc Tukey Honest significant Test (HSD) was used to identify the significant groups, p-value (<0.05).
Results: All the post-bleach specimens showed significantly higher mean ∆E (more whiter) values compared to their respective pre-bleach specimens (baseline values) (p-value -<0.05). Among the post-bleach groups, highest ∆E values (more whiter) were observed in subgroup 2c (HPS) (p-value=0.029). Similarly minimal morphological surface irregularities were observed in HPS. Group 1 (negative control) had the highest micro-shear bond strength compared to the experimental groups (group 2). Significantly, higher micro-shear bond strength was observed in subgroups 2b,c,d (SE, HPS, HPP) compared to subgroup 2a (HP) (p-value <0.001).
Conclusion: SE alone or in combination with HP is an efficient and effective dental bleaching agent.
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