Comparative Evaluation of Micro Tensile Bond Strength of Two Types of Adhesive Systems After Dentin Pretreatment with Chlorhexidine and Propolis Under In-Vivo Simulating Conditions

Document Type : Original Article

Authors

1 Lecturer of Operative Dentistry, Faculty of Oral and Dental Medicine, Nahda University, Egypt.

2 Professor of Operative Dentistry, Faculty of Oral and Dental Medicine, Nahda University. Professor of Restorative and Dental Materials Department, Oral and Dental Research Division, National Research Centre, Egypt.

Abstract

This study aimed to evaluate the micro-tensile bond strength of the two-steps etch-and rinse and one-step self-etch adhesive systems to dentin under in-vivo simulating circumstances including intra-pulpal pressure (IPP) and immersion in artificial saliva at 37 o C after treatment with chlorohexidine and propolis extract. 48 recently extracted sound human third molars were randomly divided into two main groups (n=24 teeth) according to the tested adhesive system: group I: Adper TM Single Bond 2 adhesive system SB2 (Two-step etch-and- rinse adhesive system), Group II: OptiBond OB (one-step self-etch adhesive system) All-in-one adhesive system. Three subgroups (n=8 teeth) emerged from each main group based on the cavity disinfectant utilized: subgroup I: 2% CHX, subgroup II: 10% PRO, while subgroup III: no cavity disinfectant was applied (control group). Prior to receiving any treatments, all specimens were attached to the intra-pulpal pressure assembly and set for 24 hours at a pressure of 20 mmHg. Microtensile bond strength and mode of failure was tested. Results showed that SB2 adhesive treated with CHX showed higher statistically significant difference in all subgroups, while OB with no treatment showed lowest bond strength values. It was also concluded that bond durability of self-etch adhesive systems is worse than etch and rinse adhesives under simulated IPP regardless of the pre-treatment protocol pre-treatment of dentin with CHX or Propolis cavity disinfectants prior to the bonding have a positive impact on the micro-tensile of the resin-dentin bond that went through aging with the etch-and-rinse adhesive system.

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Egyptian Dental Journal
Volume 71, Issue 4 - Serial Number 5
Conservative Dentistry and Endodontics
October 2025
Pages 3541-3551

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