Journal of Conservative Dentistry
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Year : 2013  |  Volume : 16  |  Issue : 2  |  Page : 148-151

Ionizing irradiation affects the microtensile resin dentin bond strength under simulated clinical conditions

1 Department of Conservative Dentistry and Endodontics, SGT Dental College, Gurgaon, Haryana, India
2 Department of Prosthodontics, SGT Dental College, Gurgaon, Haryana, India

Correspondence Address:
Suman Yadav
Department of Conservative Dentistry and Endodontics, SGT Dental College, Gurgaon, Haryana
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0707.108198

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Objectives: This study evaluated the effect of ionizing radiations on resin-dentin interface in terms of marginal adaptation and micro-tensile bond strength under thermocycling and mechanical loading. Materials and Methods: Forty extracted human mandibular third molars were divided into four groups. GR I: No Irradiation and Class II MO cavities were prepared that were restored with composite restorations; GR II: Teeth were irradiated and restored; GR III: Teeth were restored and irradiated; GR IV: Teeth were restored during irradiation dosage fractions. All samples were thermal and mechanical loaded with 5000 cycles, 5 ± 2-55 ± 2°C, dwell time 30 s and 150,000 cycles at 60N. Resin-dentin slabs were trimmed into dumbbell-shaped slabs and microtensile bond strength was measured. The bond strength data was analyzed by one-way analysis of variance test. Results and Conclusions: Irradiation before tooth preparation deteriorated the microtensile bond strength.

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