Fracture Resistance of Different Resin Composite Restorative Materials in Mesio-occluso-distal Cavities Prepared in Maxillary Premolar Teeth With and Without Ribbond Fibers Reinforcement: An In-vitro Study

Document Type : Original Article

Authors

1 Department of Conservative Dentistry, Faculty of Dentistry, Cairo University.

2 Department of Dental Biomaterials, Dentistry, Faculty of Dentistry, Cairo University

Abstract

Aim of the study: Our study aimed to evaluate the effect of polyethylene fibers application on the fracture resistance of different resin composite restorative materials in MOD cavities prepared in maxillary premolars with and without Ribbond fibers reinforcement. Materials and methods: fifty intact human upper premolars teeth extracted for periodontal or orthodontic causes were collected, The teeth were divided into five equal groups: Group 1 (control group): positive control intact teeth without cavity preparation, and 4 intervention groups where the MOD cavity was prepared and treated with different interventions as following, group 2: Filtek Z350 XT without Ribbond fibers, group 3: Filtek Z350 XT with Ribbond fibers placed on axial wall and pulpal floor, group 4: Estelite sigma quick composite without Ribbond fibers and group 5: Estelite sigma quick composite with Ribbond fibers placed on axial wall and pulpal floor. Teeth were thermocycled 500 times ranging from temperature 50 to 550 for one minute in each cycle. Loads at which the restorations fractured were recorded and statistically analysed. Results: There was no statistically significant difference between positive control group and the Filtek Z350 XT and the Estelite sigma quick composite without Ribbond fibers. The fracture load was significantly elevated in Filtek Z350 XT with Ribbond fibers (1658±189.84) and Estelite sigma quick composite with Ribbond fibers groups (1691.2±359.12) compared to the positive control group (p<0.001). Conclusions: The higher fracture load was achieved when reinforcing Filtek Z350 XT or Estelite sigma quick composite resin with Ribbond fibers for MOD restorations.

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