EVALUATION OF THE INTERNAL FIT OF PRESSABLE VERSUS CAD/CAM PEEK POST AND CORE USING SCANNING ELECTRON MICROSCOPE: AN IN VITRO STUDY | ||||
| Egyptian Dental Journal | ||||
| Article 26, Volume 68, Issue 4, October 2022, Page 3671-3682 PDF (689.77 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2022.155151.2210 | ||||
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| Authors | ||||
Shaimaa Naddar   1; Iman Hamdy 2; Maha Taymour3
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| 1BDS, 2014, Faculty of Dentistry, Misr International University, MSc Degree, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University | ||||
| 2Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University | ||||
| 3Associate Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo and New Giza University | ||||
| Abstract | ||||
| Aim: The study was conducted to evaluate the internal fit and marginal adaptation of custom-made Pressable compared to CAD/CAM PEEK post and core at three levels Methodology: Twenty-eight extracted maxillary central incisors were prepared for custom post and cores. Acrylic resin patterns were fabricated and divided into two groups: CAD/CAM group: Resin patterns were directly scanned and milled from modified PEEK blocks and Press group: Patterns were pressed with granulate. Cement thickness was measured at four standardized points and the vertical marginal discrepancy was measured at twelve points using scanning electron microscope. One Way-ANOVA and Tukey`s post hoc test were performed to compare between the sections of each group; while Independent T-test was performed to compare between the two groups at different sections Results: Regarding CAD/CAM group, the mean cement thickness was the highest in the coronal section (85.57±17.81) followed by the middle (72.87±18.57) then the apical (45.92±18.73). While for Press group, the middle section showed the highest mean cement thickness (50.99±15.98), followed by the coronal section (39.70±18.16), the apical section (21.37±4.30). Comparing between the two groups, CAD/CAM group had significantly higher internal gap in all sections (P=0.0001). Among cores marginal adaptation, no significant difference in means of all surfaces was revealed between the CAD/CAM (98.83±13.90) and press (95.08±13.91) groups (P=0.54) Conclusion: Within the limitations of this study, pressed PEEK post and cores achieved superior internal fit compared to CAD/CAM. Neither CAD/CAM nor pressing technique influenced the marginal adaptation of PEEK cores and both were within the clinical acceptance range | ||||
| Keywords | ||||
| CAD/CAM; press; post and cores; internal fit; marginal adaptation | ||||
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