Journal Article

The Effect of Thermocycling on Interfacial Bonding Stability of Self-Etch Adhesives: OCT Study

Bakhsh, T. A., Turkistani, A.

2021

Overview

Objective. The aim of this study was to monitor the behavior of interfacial gaps formed under different bonded polymeric restorations before and after thermocycling (TC), using swept-source optical coherence tomography (SS-OCT) and confirming the obtained findings with confocal laser scanning microscopy (CLSM). Materials and Methods. Cylindrical class I cavities were prepared in twenty noncarious human premolar teeth (1.5 mm depth×3.5 mm diameter) and divided randomly into two groups: TS and SN, according to the adhesive system (n=10). In the TS group, one-step self-etch adhesive Clearfil Tri-S Bond Plus (Kuraray Noritake Dental, Japan) was used, followed by composite restoration using Estelite Sigma Quick (Tokuyama Dental, Japan). In the SN group, the cavities were restored with the two-step self-etch/composite silorane-based resin restoration system (3M ESPE, USA). All specimens were restored in bulk filling technique and cured in accordance with the manufacturers’ instructions. Both groups were imaged under SS-OCT after 24 h and recorded as controls. Then, each group was subjected to thermal challenge using the TC machine (5–55°C) and B-scans were recorded at different TC intervals (2600, 5200, and 10000). In order to confirm the SS-OCT findings, additional specimens were prepared, scanned, and sectioned for CLSM observation. Results. B-scans demonstrated white clusters at the tooth-resin interface that corresponded to the gap location on CLSM images. The TS group showed significantly less gap formation than the SN group before and after TC (p<0.001). Conclusions. An optimal composite adaptation can be achieved when the bonded restoration comprises a combination of an adhesive containing 10-MDP monomer and a considerable highly filled composite.

• Publisher: Hindawi,John Wiley & Sons, Inc
• Subject: Adhesives / Adhesives - chemistry / Analysis / Biomedical research / Bond strength / Composite Resins - chemistry / Composition / Confocal microscopy / Curing / Dental adhesives / Dental Bonding - methods / Dental caries / Dental glass ionomer cements / Dental materials / Dental restorative materials / Dentistry / Diagnostic imaging / Fluorides / Health aspects / Humans / Interface stability / Interfacial bonding / Japan / Laser scanning microscopy / Light / Materials Testing - methods / Mechanical properties / Methods / Microscopy, Confocal - methods / Optical Coherence Tomography / Optical tomography / Polymerization / Resin Cements - chemistry / Resins / Scanning microscopy / Silorane Resins - chemistry / Skeletal composites / Surface Properties / Teeth / Thermal cycling / Thermal properties / Thermodynamic cycles / Tomography, Optical Coherence - methods