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Year : 2020  |  Volume : 17  |  Issue : 3  |  Page : 85-89

Effect of radiotherapy on bond strength of different endodontic sealers to root dentin

1 Department of Endodontics, Tanta University, Tanta, Egypt
2 Department of Endodontics, Faculty of Dentistry, Tanta University, Tanta, Egypt
3 Department of Oncology and Nuclear Medicine, Faculty of Medicine, Menoffia University, Menoffia, Egypt

Correspondence Address:
Sahar A Fouda
Department of Endodontics, Faculty of Dentistry, Tanta University (BDS), Tanta, El-Garbia
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/tdj.tdj_48_19

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Aim The aim was to evaluate the effect of radiotherapy on push-out bond strength of different sealers (Endosequence, MetaSEAL Soft, Tubliseal) to root dentin. Materials and methods A total of 60 extracted premolars with nearly straight single root canals were selected. All teeth were decoronated leaving root sample of nearly 15 ± 1 mm length. Root canals preparation were performed using ProTaper rotary system. Roots were randomly divided into six groups according to radiation exposure and type of sealer used. Group I: MetaSEAL Soft positive, Group II: Endosequence positive, Group III: Tubliseal positive, Group IV: MetaSEAL Soft negative, Group V: Endosequence negative and Group VI: Tubliseal negative. After obturation, positive groups were subjected to a cumulative radiation dose of 60 Gy in 30 fraction for 6 weeks. Three dentin slices were obtained from each root third and push-out test was measured using universal testing machine. The maximum failure load was recorded in Newton (N) and then converted into MegaPascal (MPa). Bond strength values were analyzed using two-way analysis of variance and multiple pairwise Tukey's test at P value less than or equal to 0.05. Results Irradiated groups recorded lower bond strength values than nonirradiated groups. Groups obturated with gutta-percha/Tubliseal recorded the lowest values when comparing between sealers regardless radiation exposure and sections. Coronal sections had superior bond strength values than middle and apical sections in all groups. Conclusion Radiotherapy had a negative effect on bond strength of sealers to root dentin. Endosequence BC sealer had better bond strength to radiculer dentin than MetaSEAL Soft and Tubliseal sealers.

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