Abstract
Dentine pretreatment through sandblasting procedures has been widely studied but no curve test results are currently available. Thus, the aim herein was to in vitro compare the adhesive strength in sandblasted or not samples using a universal testing machine. Thirty -two bovine teeth were divided into two groups, namely test (n = 16 bars), sandblasting with aluminum oxide particles (50 µm) was performed before the adhesion procedures), and control (n = 16 bars), where no sandblasting procedure was performed. A bi-material curve test was used to evaluate the characteristics of the dentine pretreatment in terms of tensile stress and fracture strength. A scanning electron microscope (SEM) was used to analyze the fracture topography in the composite, bonding, dentin, and at the relative interfaces. The results demonstrated a statistically significant difference between the two groups in terms of tensile stress at maximum load showing values of 84.300 ± 51.342 MPa and 35.071 ± 16.609 MPa, respectively for test and control groups (p = 0.033). Moreover, a fracture strength test showed values of 18.543 ± 8.145 MPa for test and 8.186 ± 2.833 MPa for control group (p = 0.008). In conclusion, the sandblasting treatment of the dentine significantly influenced the mechanical resistance of the adhesion in this in vitro study.
Highlights
The main purpose of dentistry, among others, is to restore patients’ aesthetics in compliance with function requirements and durability over the years [1,2]
Data obtained from tensile stress at maximum load tests were 84.300 ± 51.342 MPa for the Test
The Scanning electron microscope (SEM) images of the Control group shown a clear failure at the interface between dentin and adhesive, recording a lower resistance to adhesion compared to the Test samples (Figure 4b,d and Figure 5c)
Summary
The main purpose of dentistry, among others, is to restore patients’ aesthetics in compliance with function requirements and durability over the years [1,2]. Different adhesion protocols, alternative materials, and substrate pretreatment procedures able to influence the degree of adhesion have been studied [13,14,15,16]. In this regard, chemical or mechanical dentin pretreatments are procedures that increase the roughness of the treated surface and may influence the adhesion strength of a bonding agent by increasing the contact area between the dentine and the adhesive surface [17]. In order to enhance the dentin bond strength during adhesive restorations, several studies have investigated various dentin surface pretreatment procedures. On the other hand, based on the hypothesis that the elimination of the organic phase of the smear layer may improve the performance of the adhesive systems, the dentine pretreatment with sodium hypochlorite or hydrogen peroxide, have not obtained the desired results, especially when using self-etch adhesive systems [17]
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