Fracture Strength and Retention of All-Ceramic Endocrowns Luted Using Two Different Resin Cements | ||||
| Al-Azhar Journal of Dentistry | ||||
| Volume 2017, Issue 1, January 2017 | ||||
| DOI: 10.21608/adjg.2017.5192 | ||||
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| Authors | ||||
| Enass Khemakhem1; Mona Mandour2; Rania Amin2 | ||||
| 1Demonstrator in Crowns & Bridges, Faculty of Oral & Dental Medicine & Surgery. Tripoly University. | ||||
| 2Assistant Professor of Crowns & Bridges, - Faculty of Dentistry. Al-Azhar University (Girl’s Branch). | ||||
| Abstract | ||||
| Purpose: The purpose of this in vitro study was to evaluate and compare the fracture resistance and retention of CAD/CAM endocrowns and conventional glass fiber post supported crowns. Materials and Methods: Sixty-four (N=64) sound mandibular molars were endodontically treated and randomly assigned into 2 groups (n=32 each) according to the type of restoration constructed; Group (E): Endodontically treated teeth restored with IPS e.max CAD, lithium disilicate based, endocrowns and Group (P): Endodontically treated teeth restored with glass-fiber posts, composite cores and IPS e. max CAD crowns. Samples of each group were further subdivided into 2 subgroups (n=16 each) according to the type of adhesive resin cement used. the samples were thermocycled (2000 cycle, between 5oC-55oC). Samples were mountedin a universal testing machine and loaded to failure at a crosshead speed of 1.0 mm / min. The failure loads were recorded. Data were analyzed using one-way analysis of variance (ANOVA) and Tukey’s post hoc significance difference tests. Differences were considered significant at P<0.05. The pull-out test was performed on a universal testing machine and the values obtained were statistically analyzed by analysis of variance using one-way analysis of variance (ANOVA)) and multiple comparison test of Tukey, with level of significance at P<0.05. Results: Statistical analysis using twowayanalysis of variance (ANOVA) test revealed no statistically significant difference in failure load among the four tested subgroups (at P< 0.05). Endocrowns recorded statistically significant mean higher fracture load values (1729.91N±407.9) compared to post retained crowns, (1435.84±405.2). Statistical analysis using two ways analysis of variance (ANOVA) test revealed a statistically significant difference in debonding load among the four tested subgroups (at P<0.05). Tukey’s post hoc test revealed a significant difference between each two subgroups. The highest mean debonding loadwas recorded in the subgroup (PR) (96.98N±4.47), whereas the least value was recorded in the subgroup (EM) (49.48N±3.81). Conclusions: lithium disilicate based endocrown restorations increase the fracture resistance of endodontically treated molars compared to conventional crowns associated with glass fiber posts and resin composite filling cores. | ||||
| Keywords | ||||
| Endocrown _ CAD/CAM _ FRCs _ Fracture strength_Endodontically treated teeth | ||||
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