Journal of Conservative Dentistry
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Year : 2011  |  Volume : 14  |  Issue : 4  |  Page : 341-345

Effect of fiber orientation and type of restorative material on fracture strength of the tooth

1 Department of Operative Dentistry, School of Dentistry, Shaheed Beheshti University of Medical Sciences, Tehran, Iran
2 Department of Operative Dentistry, Hamedan Dental University, Hamedan, Iran

Correspondence Address:
Maryam Moezizadeh
Flat No. 8, Door No. 287, Building 280, Dolat Ave., Pasdaran Street, Tehran
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0707.87194

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Aim : To determine the effect of fiber and its orientation on the fracture resistance of composite restorations in root-filled premolars. Materials and Methods : 50 sound human premolars were collected and assigned to five groups of ten specimens each. In group 1 (control), specimens were not root-filled. In the other four groups, MOD cavities were prepared and the cusps were reduced to 1.5 mm. In groups 2 and 3, the samples were filled with Z-250 and spectrum composites respectively without fiber reinforcement. Groups 4 and 5 were reinforced with Fiber-Ribbon-(Angelus) and restored with spectrum composite. Fibers were placed in the U-shaped design in group 4 while they were placed in the cross-shape in occlusal region in group 5. The fracture resistance was tested using a mechanical testing machine at crosshead speed of 1mm/min. Results : The fracture strength of control group was 1271.16±722.04 N while it was 952.05±330.16 N for group 2, 918.52±256.6 N for group 3, 857.13±184.58 N for group 4 and 1138.81±406.64 N for group 5. Fracture strength of group 5 was more than other groups except for group 1, there was no statistically significant differences. Conclusions : The reinforcement of composite with fiber does not increase fracture resistance of root-filled premolars significantly.

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