Evaluation of Marginal Accuracy of PEEK Vs. Lithium Disilicate Single Crowns Constructed By Two Fabrication Techniques: CAD/CAM And Heat Press (In-Vitro Study) | ||||
Journal of Fundamental and Clinical Research | ||||
Article 9, Volume 3, Issue 1, June 2023, Page 63-85 PDF (620.27 K) | ||||
Document Type: Original research articles | ||||
DOI: 10.21608/jfcr.2023.186598.1045 | ||||
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Authors | ||||
Weaam Nagy Nagy 1; Mostafa Hussien Kamal 2; Rana Mahmoud Sherif 3; Lamia Sayed Kheiralla 4 | ||||
1Post Graduate Researcher, Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Misr International University, Cairo, Egypt | ||||
2Lecturer of Fixed Prosthodontics Conservative Dentistry Department, Fixed Prosthodontic Division, Faculty of Oral and Dental Medicine, Misr International University, Cairo, Egypt | ||||
3Professor of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt. | ||||
4Professor of Fixed Prosthodontics, Cairo University, Cairo, Egypt. | ||||
Abstract | ||||
ABSTRACT Background: Metal-ceramic restorations were considered the gold standard, however, all-ceramic restorations gained popularity owing to their remarkable properties. Purpose: To evaluate the marginal accuracy of IPS e.max and PEEK Bio.HPP monolithic crowns constructed by two fabrication techniques (Heat Press and CAD/CAM). Materials and methods: Twenty monolithic crowns were divided into two equal groups according to the materials used. Group E: Lithium disilicate crowns and Group P: PEEK BioHPP crowns. Each group was further subdivided into two equal subgroups according to the fabrication technique with five crowns per subgroup (n=5). Subgroup H: Heat Press technique and Subgroup C: CAD/CAM technique. A biogeneric copy STL file was generated biogeneric and sent to a 5-axis CAM machine to mill identical IPS e.max, PEEK BioHPP, and wax patterns. IPS e.max and PEEK Bio.HPP crowns were then heat-pressed using the milled wax patterns. The vertical marginal gap (VMG) distance was evaluated for each crown surface at five predetermined equally distributed points using the direct view technique. Results: There was no statistically significant difference in the VMG distance between IPS e.max (23.1±2.8μm) and PEEK Bio.HPP (24.4±1.6μm) crowns. Crowns heat-pressed from IPS e.max ingots (23.1±2.8μm) and PEEK Bio.HPP pellets (24.4±1.6μm) showed a lower statistically significant mean VMG distance than the crowns CAD/CAM milled from IPS e.max blocks (29.5±3.2μm) and PEEK Bio.HPP blanks (30.2±1.4μm). Conclusion: IPS e.max and PEEK crowns fabricated using either technique showed clinically acceptable results, meanwhile the heat-pressing technique showed better marginal adaptation when compared to milled crowns. | ||||
Keywords | ||||
Marginal gap; lithium disilicate; PEEK Bio.HPP; fabrication techniques; fit | ||||
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