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, Pages 583-592 PDF (975.67 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/edj.2022.169844.2308 | ||
| Authors | ||
| Omayma Sayed* 1; Amr Elbolok2; Shams Amgad3 | ||
| 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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