Ramadan, A., Shalaby, Y., El fawal, N. (2024). MARGINAL FIT ASSESSMENT OF CAD/CAM ZIRCONIA CROWNS FABRICATED BY DIGITAL SCANNING OF DIES AND SILICONE IMPRESSION (IN VITRO STUDY). Alexandria Dental Journal, 49(3), 106-112. doi: 10.21608/adjalexu.2023.206918.1370
Ahmed Mohamed Ramadan; Yousria Attia Shalaby; Naguib Ahmad El fawal. "MARGINAL FIT ASSESSMENT OF CAD/CAM ZIRCONIA CROWNS FABRICATED BY DIGITAL SCANNING OF DIES AND SILICONE IMPRESSION (IN VITRO STUDY)". Alexandria Dental Journal, 49, 3, 2024, 106-112. doi: 10.21608/adjalexu.2023.206918.1370
Ramadan, A., Shalaby, Y., El fawal, N. (2024). 'MARGINAL FIT ASSESSMENT OF CAD/CAM ZIRCONIA CROWNS FABRICATED BY DIGITAL SCANNING OF DIES AND SILICONE IMPRESSION (IN VITRO STUDY)', Alexandria Dental Journal, 49(3), pp. 106-112. doi: 10.21608/adjalexu.2023.206918.1370
Ramadan, A., Shalaby, Y., El fawal, N. MARGINAL FIT ASSESSMENT OF CAD/CAM ZIRCONIA CROWNS FABRICATED BY DIGITAL SCANNING OF DIES AND SILICONE IMPRESSION (IN VITRO STUDY). Alexandria Dental Journal, 2024; 49(3): 106-112. doi: 10.21608/adjalexu.2023.206918.1370
MARGINAL FIT ASSESSMENT OF CAD/CAM ZIRCONIA CROWNS FABRICATED BY DIGITAL SCANNING OF DIES AND SILICONE IMPRESSION (IN VITRO STUDY)
1fixed prosthodontics , faculty of dentistry , pharos university.
2Conservative Dentistry Department, Faculty of Dentistry, Alexandria University
3Conservative Dentistry Department, Faculty of Dentistry
Abstract
Introduction: The precision of impressions has a significant impact on the marginal adaptation of fixed restorations. Fit is the most significant factor influencing the restoration's durability, retention, and periodontal health. Aim of study: to compare the marginal fit of CAD/CAM zirconia crowns manufactured using two distinct digital impression techniques. Materials and methods: A typodont tooth in the upper premolar region was prepared to receive a complete ceramic crown. A direct scan of the prepared tooth was used to create twenty 3D-printed resin impressions. The master dies were divided into two groups at random (n = 10 per group). Group I: scanning the dies digitally. Group II: digital digitization of the scannable impressions of scannable silicone. Using cone beam CT, the marginal gap and marginal discrepancy were evaluated. Results: Group I had a marginal gap of (119.5 ± 27.0) µm, which was substantially smaller than Group II's (144.8 ± 25.23) µm, and a marginal discrepancy of (107.5 ± 36.36) µm, which was smaller than Group II's (154.3 ± 49.53) µm. Conclusion: Although direct digital scanning was superior to indirect digital scanning in terms of marginal fit, all tested techniques yielded clinically acceptable fit values. Keywords: Marginal fit, CAD/CAM, digital impression. Running title: Marginal fit of zirconia crowns fabricated by direct and indirect digital scanning.
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