Nagy, W., Kamal, M., Sherif, R., Kheiralla, L. (2023). 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, 3(1), 63-85. doi: 10.21608/jfcr.2023.186598.1045
Weaam Nagy Nagy; Mostafa Hussien Kamal; Rana Mahmoud Sherif; Lamia Sayed Kheiralla. "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, 3, 1, 2023, 63-85. doi: 10.21608/jfcr.2023.186598.1045
Nagy, W., Kamal, M., Sherif, R., Kheiralla, L. (2023). '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, 3(1), pp. 63-85. doi: 10.21608/jfcr.2023.186598.1045
Nagy, W., Kamal, M., Sherif, R., Kheiralla, L. 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, 2023; 3(1): 63-85. doi: 10.21608/jfcr.2023.186598.1045
Evaluation of Marginal Accuracy of PEEK Vs. Lithium Disilicate Single Crowns Constructed By Two Fabrication Techniques: CAD/CAM And Heat Press (In-Vitro Study)
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.
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