EVALUATION OF MARGINAL ADAPTATION AND FRACTURE RESISTANCE OF IMPLANT-SUPPORTED CROWNS FABRICATED FROM ADVANCED LITHIUM DISILICATE AND HIGH PERFORMANCE POLYMER (AN IN-VITRO COMPARATIVE STUDY) | ||
| PUA Dental Journal | ||
| Articles in Press, Accepted Manuscript, Available Online from 20 October 2025 | ||
| Document Type: Original Article | ||
| DOI: 10.21608/puadent.2025.425882.1004 | ||
| Authors | ||
| Mennat shalby* 1; Sanaa Hussien Abdelkader2; Amir Shoukry Azer3 | ||
| 1Prosthodontics department, faculty of dentistry, Pharos university, Alexandria, Egypt | ||
| 2Professor of Fixed Prosthodontics, Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt | ||
| 3Associate Professor of Fixed Prosthodontics, Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt | ||
| Abstract | ||
| Background: The success of fixed prosthesis is dependent on marginal adaptation and fracture resistance. Although several studies were performed on lithium disilicates and PEEK, studies on advanced lithium disilicates and BioHPP are insufficient. Purpose: This study aimed to compare implant supported crowns fabricated from advanced lithium disilicate (ALD) and high performance polymer (BioHPP) regarding MA and FR. Material and methods: Twenty prefabricated Ti-bases were screwed to implant fixtures then embedded in epoxy resin molds. They were divided into 2 groups (n=10); Group (1): crowns fabricated from ALD and Group (2): crowns fabricated from BioHPP. Scanning and designing of maxillary first premolar crowns was done. Crowns were subjected to thermocycling prior to marginal gaps detection using stereomicroscope at x40 magnification during three phases. Fracture resistance was evaluated using universal testing machine. Statistical analysis was done using Mann Whitney U test and Friedman. Failure mode was analyzed using Chi Square test. Results: Advanced lithium disilicated showed significantly higher MA than BioHPP during different phases. The lowest values were recorded after cementation with median of (26.04 µm) in ALD and (40.06 µm) in BioHPP. Both groups showed significantly better marginal fit after cementation Significantly higher FR was found in ALD group with median value of (837.68 N) than BioHPP group with median value of (641.41 N). Conclusions: Advanced lithium disilicate crowns showed superior MA and FR than BioHPP. Both materials showed better MA after cementation. Keywords: Marginal adaptation, fracture resistance, Computer-aided design and computer-aided manufacturing (CAD-CAM), advanced lithium disilicate, BioHPP. | ||
| Keywords | ||
| Keywords: Marginal adaptation; fracture resistance; Computer-aided design and computer-aided manufacturing (CAD-CAM); advanced lithium disilicate; BioHPP | ||
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