Effect of air abrasion pressure and CAD/CAM milling on microtensile bond strength of reinforced composite inlays to immediately sealed dentin: An invitro comparative study

Document Type : Original Article

Authors

1 Associate Professor , Conservative Dentistry Lecturer, Cairo University, Cairo, Egypt

2 Fixed Prosthodontic Department, Cairo University

Abstract

Objectives: The aim of this study was to evaluate the microtensile bond strength of CAD-CAM fabricated reinforced composite (Brilliant Crios) inlays to immediately sealed dentin surface in absence of air abrasion, depending only on the roughness produced by the CAD/CAM milling tools, and after sandblasting the fitting surface at high pressure, after artificial aging.
Materials and Methods: Standardized occlusal cavities were prepared in extracted molar teeth to receive inlay restorations. All prepared cavities received immediate dentin sealing treatment. Brilliant Crios inlay restorations were individually designed and milled utilizing CAD/CAM system. Specimens were randomly divided into two equal groups according to the surface treatment applied to the fitting surface of the restoration before cementation; Group I: No treatment (CAD/CAM milled surface), Group II: Post-milling air abrasion at high pressure. All specimens were then subjected to thermocycling, followed by microtensile bond strength testing. Independent samples T-tests were used to evaluate the results.
Results: The mean microtensile bond strength of Group I was 11.99 MPa ± 0.45, while that of Group II was 10.91 MPa ± 0.24. A statistically significant difference between the tested groups was found (p=0.040).
Conclusions: In the absence of adhesive layer applied to the fitting surface of Brilliant Crios inlay restorations, the surface roughness produced by CAD/CAM milling solely had the ability to establish a better bond after artificial aging compared to that established after air abrasion at high pressure.

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Egyptian Dental Journal
Volume 68, Issue 1 - Serial Number 5
January (Conservative Dentistry and Endodontics)
January 2022
Pages 995-1002

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