Abstract
Abstract Objective The evolution of adhesive dentistry and the addition of nanoparticles has heralded an improvement in the mechanical properties of adhesives. Thus, the aim of the present study was to evaluate the effects produced by carbon nanotubes (CN) added to two adhesives used for indirect bonding by an examination of the shear bond strength (SBS) and location of bond failure. Methods One hundred and sixty bovine incisors were randomly divided into eight groups (N = 20): (1) indirect bonding with Sondhi adhesive; (2), (3) and (4) indirect bonding with Sondhi adhesive into which CN at 0.5%, 0.25% and 0.05% concentrations were incorporated; (5) indirect bonding with Concise adhesive; (6), (7) and (8) indirect bonding with Concise adhesive into which CN at 0.5%, 0.25% and 0.05% concentrations were incorporated. Following etching with 37% phosphoric acid and the placement of brackets, maximum shear bond strength (SBS) was measured with a mechanical testing machine. The location of bond failure was evaluated using the Adhesive Remnant Index (ARI). The SBS between groups and ARI scores were statistically analysed (p < 0.05). Results There was no statistical difference (p > 0.05) in SBS or ARI. Conclusions CN addition to Concise and Sondhi adhesives did not influence the SBS and the ARI of the brackets. Therefore, in the conditions of this experiment, there was no benefit in the addition of CN to orthodontic adhesives.
Highlights
Developments in the field of dental materials, in dental adhesives, have led to the replacement of banding procedures by the bonding of orthodontic attachments.[1]
The present study aimed to evaluate the changes that might result from the addition of carbon nanotubes (CN) to two types of adhesives commonly used in indirect bracket bonding by examining the shear bond strength (SBS) and the amount of adhesive remaining on the teeth after debonding
Lewis and Mladsi[26] reported improved stiffness and tensile strength of polymethyl methacrylate (PMMA) resin incorporated with 0.5 wt% of CN compared with the incorporation of 0.25 wt% and 0.125 wt%
Summary
The evolution of adhesive dentistry and the addition of nanoparticles has heralded an improvement in the mechanical properties of adhesives. The aim of the present study was to evaluate the effects produced by carbon nanotubes (CN) added to two adhesives used for indirect bonding by an examination of the shear bond strength (SBS) and location of bond failure. Following etching with 37% phosphoric acid and the placement of brackets, maximum shear bond strength (SBS) was measured with a mechanical testing machine. The location of bond failure was evaluated using the Adhesive Remnant Index (ARI). The SBS between groups and ARI scores were statistically analysed (p < 0.05). Results: There was no statistical difference (p > 0.05) in SBS or ARI. Conclusions: CN addition to Concise and Sondhi adhesives did not influence the SBS and the ARI of the brackets. In the conditions of this experiment, there was no benefit in the addition of CN to orthodontic adhesives. (Aust Orthod J 2017; 33: 57-63)
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