Assessment of the Fracture Resistance of Novel Zirconia Reinforced Glass Ionomer in Comparison to Nano Hybrid Resin Composite Restorations | ||||
| Egyptian Dental Journal | ||||
| Article 19, Volume 65, Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), October 2019, Page 3735-3744 PDF (472.91 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2019.76018 | ||||
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| Authors | ||||
| Rehab Khalil Safy; Heba Bahgat Abd Elmohsen | ||||
| Lecturer of Operative Dentistry, Faculty of Dentistry, Suez Canal University, Egypt | ||||
| Abstract | ||||
| Objective: Evaluation of the influence of newly introduced Zirconia reinforced glass ionomer when used as a base or as a restorative material on fracture resistance and fracture pattern of class II restorations. Methodology: Forty extracted, intact mandibular third molars with standardized MO cavities were randomly assigned into four groups according to the type restorative material: The control group was restored using nano hybrid resin composite (RC), Zirconia reinforced restorative glass ionomer group was used for restoring Zr group, resin modified glass ionomer cement as a base material below the resin composite restorations in RC/RMGI group and Zirconia reinforced restorative glass ionomer as a base material below the resin composite restorations in group RC/Zr group. After thermal cycling fracture resistance of the specimens was tested by the application of load in a universal testing machine. Fracture pattern of each specimen was also evaluated. Mean fracture resistance values for each group were calculated and compared using one way ANOVA (P = 0.05). Results: The highest mean load necessary to fracture the specimens was found in RC/RMGI followed by RC/Zr and RC groups respectively. While the lowest mean value was found in Zr group. The highest frequency of specimens’ reparability was found in Zr group followed by RC/Zr and RC groups respectively. While the least frequency of reparability was found in RC/RMGI group. Conclusions: Within the limitations of the current study, it could be concluded that despite higher fracture strength values of RMGIC as a base material below the resin composite restorations, clinicians might prefer using of Zirconomer Improved® as either a restoration or a base material as its fracture patterns are repairable. | ||||
| Keywords | ||||
| Class II; Zirconomer Improved; resin modified glass ionomer cement; nano hybrid resin composite; Fracture resistance; failure mode | ||||
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