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Radiotherapy does not impair dentin adhesive properties in head and neck cancer patients
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Radiotherapy does not impair dentin adhesive properties in head and neck cancer patients
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Journal Article
Radiotherapy does not impair dentin adhesive properties in head and neck cancer patients
2014
Overview
Objectives
This study evaluated the influence of radiotherapy on the dentin bond strength of teeth extracted from patients who had undergone head and neck radiotherapy.
Materials and methods
A total of 36 samples were divided into two experimental groups: group I (control group,
n
= 18) and group II (in vivo irradiated group,
n
= 18). Groups I and II were further separated into three subgroups (six specimens per subgroup), which were further assigned to the three adhesive system protocols employed: Single Bond 2 (SB) (3M ESPE), Easy Bond (EB) (3M ESPE) and Clearfil SE Bond (CSE) (Kuraray). The adhesive systems were applied to the prepared surface according to the manufacturers’ instructions and restored using composite resin (Filtek Supreme, 3M ESPE). After 24 h in deionised water (37
o
C), teeth were horizontally and vertically cut to obtain beam specimens with a cross-section area of 0.8 ± 1.0 mm
2
. Specimens were tested in tension using a universal testing machine at a cross-speed of 0.5 mm/min. Fracture patterns were observed under SEM. Data was analysed by two-way analysis of variance (
p
≤ 0.05).
Results
No statistically significant difference was found between the irradiated (R/SB = 44.66 ± 10.12 MPa; R/EB = 41.48 ± 12.71 MPa; and R/CSE = 46.01 ± 6.98 MPa) and control group (C/SB = 39.12 ± 9.51 MPa; C/EB = 42.40 ± 6.66 MPa; and C/CSE = 36.58 ± 7.06 MPa) for any of the adhesive systems. All groups presented a predominance of mixed fracture modes.
Conclusion
Head and neck radiotherapy did not affect dentin bond strength for the adhesive materials tested in this study.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
