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Evaluation of physical and adhesive properties of enamel after a therapeutic dose of radiation and bonding of orthodontic metal brackets: an in vitro study

Published online by Cambridge University Press:  23 January 2020

A. Anushree ,
Ashutosh Shetty Open the ORCID record for Ashutosh Shetty [Opens in a new window] ,
Crystal Runa Soans ,
M. N. Kuttappa ,
Akhil Shetty ,
Kaushik Shetty  and
U. S. Krishna Nayak
A. Anushree
Affiliation:
Department of Orthodontics and Dentofacial Orthopaedics, AB Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
Ashutosh Shetty*
Affiliation:
Department of Orthodontics and Dentofacial Orthopaedics, AB Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
Crystal Runa Soans
Affiliation:
Department of Orthodontics and Dentofacial Orthopaedics, AB Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
M. N. Kuttappa
Affiliation:
Department of Orthodontics and Dentofacial Orthopaedics, AB Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
Akhil Shetty
Affiliation:
Department of Orthodontics and Dentofacial Orthopaedics, AB Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
Kaushik Shetty
Affiliation:
Department of Orthodontics and Dentofacial Orthopaedics, AB Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
U. S. Krishna Nayak
Affiliation:
Department of Orthodontics and Dentofacial Orthopaedics, AB Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
*
Author for correspondence: Ashutosh Shetty, Department of Orthodontics and Dentofacial Orthopaedics, AB Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India. E-mail: [email protected]
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Abstract

Aim:

The study aimed to evaluate the shear bond strength (SBS) of metal brackets and adhesive properties of bonded irradiated and non-irradiated teeth.

Methods:

Sixty-six extracted premolar samples were randomly divided into three groups—(a) Control group consisting of 22 non-irradiated, non-aged teeth (Group 1), (b) 22 non-irradiated, aged samples (Group 2) and (c) 22 irradiated, aged samples (Group 3). Irradiation was done using gamma irradiation with a fractionated dose of 60 Gy for 5 consecutive days per week over 6 weeks. Metal brackets were bonded on all samples with light cure adhesive and subjected to SBS test using universal testing machine. The samples were assessed under the scanning electron microscope to check for the adhesive remnant index (ARI) and tag depth.

Results:

There was a statistically significant decrease in the mean SBS of the irradiated samples compared to the non-irradiated teeth. The non-irradiated, aged samples showed a majority of ARI scoring 1 and 2. Whereas, the irradiated samples showed ARI scoring 2 and 3. Approximately, 77·3% of the non-irradiated samples showed no adhesive present on the tooth surface, and 27·2% of the irradiated samples had more than 50% adhesive present on the enamel surface.

Conclusion:

There is a statistically significant decrease in SBS of irradiated enamel compared to that of non-irradiated teeth. However, the SBS observed in the three groups was well above the ideal SBS for orthodontic bonding, that is, 5·6–6·8 MPa. The adhesive remnant was found on all samples of the irradiated group. Deeper adhesive resin tags were found in the irradiated group in the resin–enamel interface.

Keywords

adhesive remnant indexbonding on irradiated teethradiotherapyscanning electron microscopyshear bond strength
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 20 , Issue 1 , March 2021 , pp. 78 - 82
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Copyright
© The Authors, 2020. Published by Cambridge University Press

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