Effect of Sonic Application on Microshear Bond Strength of Self-cure Universal Adhesive System to Dentin: In Vitro Study.

Document Type : Original Article

Authors

1 Demonstrator of Operative Dentistry Department, Faculty of Dental Medicine, Boys, Cairo, Al-Azhar University.

2 assisstant professor of restorative dentistry, facultyof dental medicine,al azhar university,cairo

3 Lecturer in Operative Dentistry Department, Faculty of Oral and Dental Medicine, Al–Azhar University (boys-Cairo)

Abstract

Objective: To assess the effect of sonic application on microshear bond strength (μSBS) of self-cure universal adhesive system to dentin. Materials and methods: A total of 48 specimens were obtained from 16 extracted molars after the occlusal surfaces were ground to expose the occlusal dentin. The samples were categorized into two primary groups (n=24) according to the application mode (manual and sonic). Afterwards, each main group was divided into 2 subgroups (n=12) based on universal adhesive system type; self-cure group (Palfique universal bond) and light-cure group (Single bond universal adhesive). Each subgroup was subsequently subdivided into two divisions based on storage time (three-months and six-months). A custom-made silicon sheet was seated over the tooth and the two adhesive systems were applied observing the manufacturer's guidelines (manual group) or sonic agitation for 20s (sonic group), then the nanofilled composite (Palfique lx5 composite) was added and packed into the holes. The µSBS was evaluated through a universal testing device after two water storage periods (three-months and six-months). Results: The sonic application mode showed a statistically significantly higher μSBS than manual application in both adhesives. There were no significant variances among the two types of adhesive systems or between the storage periods. However, the light-cure adhesive displayed a non- significantly higher μSBS than self-cure adhesive and there was a non-significant decrease in the μSBS with time in both adhesives. Conclusions: Sonic application may be considered an effective technique that can improve the dentin bonding strength of self-cure and light-cure adhesive systems.

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Al-Azhar Journal of Dental Science
Volume 28, Issue 3 - Serial Number 3
July - Restorative Dentistry Issue (Removable Prosthodontics, Fixed Prosthodontics, Endodontics, Dental Biomaterials, Operative Dentistry)
July 2025
Pages 349-357

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