Effect of Chlorhexidine and Benincasa Hispida Pretreatment on Microshear Bond Strength of Universal Adhesive System on Dentin: A Pilot Study

Abstract

Introduction: Achieving strong bond strength of adhesive systems to deep dentin is challenging. Various methods to improve bond strength to deep dentin have been investigated. Chlorhexidine (CHX) enhances the longevity of the bond between adhesives and dentin by inhibiting the collagenolytic activity of Matrix Metalloproteinases (MMPs). Benincasa hispida is a natural plant-based functional food containing minerals and vitamins that help prevent osteoporosis and improve bone health. Aim: To evaluate the Microshear Bond Strength (MSBS) of a 10-methacryloyloxydecyl-dihydrogen Phosphate-based (10-MDP) universal adhesive system to coronal dentin with different dentin surface pretreatments, specifically CHX and Benincasa hispida. Materials and Methods: An in-vitro pilot study was conducted at the Department of Conservative Dentistry and Endodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India, from May 2023 to November 2023. Dentin discs (42) were prepared from human mandibular first molars. A standard etch-and-rinse protocol was performed on the discs. The specimens were assigned to different dentin pretreatments: Group-I (no pretreatment), Group-II (CHX) and Group-III (Benincasa hispida). CHX and Benincasa hispida were applied using micro applicator tips. A dentin bonding agent containing 10-MDP (DBA) was applied, photopolymerised and a composite restoration was fabricated. The MSBS to dentin was evaluated using a universal testing machine. The failure patterns were analysed using a stereomicroscope at 10x magnification. One-way Analysis of Variance (ANOVA) and Tukey’s Honestly Significant Difference (HSD) HSD tests were used for statistical analysis, with a significance level set at α=0.05. Results: The mean MSBS values were 24.2732±5.41329 MPa for Group-III, 14.3848±4.23492 MPa for Group-II and 6.9724±3.15837 MPa for Group-I. Pretreatment of dentin with B. hispida resulted in significantly higher MSBS values compared to the other two groups (p<0.001*). Conclusion: Pretreatment with B. hispida significantly improved MSBS. Thus, B. hispida pretreatment may be beneficial in increasing dentin bond strength.

Keywords

• dentin bonding
• dentine pretreatment
• hybrid layer
• matrix metalloproteinase