ASSESSMENT OF INTERNNAL ADAPTATION OF CAD CAM ALL CERAMIC CROWNS WITH TWO DIFFERENT MARGIN DESIGNS
Sayed, O., Elbolok, A., Amgad, S. (2023). ASSESSMENT OF INTERNNAL ADAPTATION OF CAD CAM ALL CERAMIC CROWNS WITH TWO DIFFERENT MARGIN DESIGNS. EKB Journal Management System, 69(1), 583-592. doi: 10.21608/edj.2022.169844.2308
Omayma Sayed; Amr Elbolok; Shams Amgad. "ASSESSMENT OF INTERNNAL ADAPTATION OF CAD CAM ALL CERAMIC CROWNS WITH TWO DIFFERENT MARGIN DESIGNS". EKB Journal Management System, 69, 1, 2023, 583-592. doi: 10.21608/edj.2022.169844.2308
Sayed, O., Elbolok, A., Amgad, S. (2023). 'ASSESSMENT OF INTERNNAL ADAPTATION OF CAD CAM ALL CERAMIC CROWNS WITH TWO DIFFERENT MARGIN DESIGNS', EKB Journal Management System, 69(1), pp. 583-592. doi: 10.21608/edj.2022.169844.2308
Sayed, O., Elbolok, A., Amgad, S. ASSESSMENT OF INTERNNAL ADAPTATION OF CAD CAM ALL CERAMIC CROWNS WITH TWO DIFFERENT MARGIN DESIGNS. EKB Journal Management System, 2023; 69(1): 583-592. doi: 10.21608/edj.2022.169844.2308

ASSESSMENT OF INTERNNAL ADAPTATION OF CAD CAM ALL CERAMIC CROWNS WITH TWO DIFFERENT MARGIN DESIGNS

Egyptian Dental Journal
Article 14, Volume 69, Issue 1 - Serial Number 4, January 2023, Page 583-592  XML PDF (975.67 K)
Document Type: Original Article
DOI: 10.21608/edj.2022.169844.2308
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Authors
Omayma Sayed email orcid 1; Amr Elbolokorcid 2; Shams Amgadorcid 3
1Post Graduate Student, Fixed Prothodontic Department, Faculty of Dentistry, Minia University, Assistant Lecturer, Faculy of Dentistry, Nahda University, Beni-Suef, Egypt.
2Professor of Oral Pathology Department, Chairman of Oral Pathology Department department, Faculty of Dentistry, Minia University, Egypt
3Associate Professor of Fixed Prosthodontics, Fixed Prothodontis Department, Faculty of Dentistry, Minia University, Egypt
Abstract
Aim: This study examined the effect of cervical finish line preparation on the internal adaptation of all-ceramic crowns produced, using CAD CAM technology with two fabricated materials: IPs Emax and Zirconia-reinforced lithium silicate (Celtra Duo).
Methods: Two intact human premolars were collected with similar preparation dimensions, except for a (1.00 mm) on the margin. For sample standardization, 40 epoxy replicas of prepared premolar teeth were produced. Deep chamfer (DC group, n = 20) and knife-edge (KE group, n = 20) finish lines were used to split samples. Each group was divided into two subgroups according to fabricated material. Subgroup 1: lithium di silicate ceramic (n=10) and Subgroup 2: lithium silicate reinforced with zirconia (n=10). All crowns were CAD/CAM-made. All samples were aged by thermo-cycling after being bonded to a tooth, and the internal adaptation was measured using a stereomicroscope.
Results: The findings demonstrated an increase in the internal adaptation between vertical preparation (127.7±8.6) and deep chamfer (109.9±6.4), regardless of the material. In addition, regardless of methodology, the difference between E-max (119.6±16) and Celtra (118±5.7).
Conclusions: Vertical preparation may be an alternative to horizontal preparation and more conservative to sound tooth structure throughout the fabrication of fixed abutments to give a less intrusive option.
Key words: Internal adaptation, Vertical preparation, CAD/CAM technology, Zirconia reinforced lithium silicate (Celtra Duo), Epoxy.
Keywords
Internal adaptation; Vertical preparation; CAD/CAM; Epoxy
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