Marginal fit of 3-unit CAD–CAM zirconia frameworks fabricated using cone beam computed tomography scans: an experimental study

Belgin H. B., Kale E., Özçelik T. B., Yilmaz B.

Odontology, cilt.110, sa.2, ss.339-348, 2022 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 110 Sayı: 2
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1007/s10266-021-00668-3
  • Dergi Adı: Odontology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, EMBASE, MEDLINE
  • Sayfa Sayıları: ss.339-348
  • Anahtar Kelimeler: CAD–CAM, CBCT, Marginal fit, Zirconia
  • Hatay Mustafa Kemal Üniversitesi Adresli: Evet

Özet

Whether cone beam computed tomography (CBCT) scans can be used for the fabrication of computer-aided design and computer-aided manufacturing (CAD–CAM) fixed dental prostheses (FDPs) is not known. The purpose of the present study was to compare the marginal fit of 3-unit zirconia FDPs fabricated by using CBCT or 3-dimensional (3D) laboratory scanning. Extracted second premolar and molar teeth in a maxillary typodont model were prepared. The first molar was removed and the typodont model was scanned with a laboratory or a CBCT scanner to generate two virtual 3D cast groups (3DL and CBCT). Forty four 3-unit zirconia FDPs were designed on virtual casts and milled. The vertical marginal discrepancy (VMD) was measured by ×100-magnification microscopy at seven locations on each abutment. A total of 616 measurements were made at 14 fixed locations in two groups of 22 specimens. The VMD data for 3DL and CBCT groups were statistically analyzed using the Mann–Whitney U test (α = 0.05). The mean VMDs on premolar ranged between 44 and 55 µm (median: 43–55 µm) in 3DL, and 74 and 100 µm (median: 72–93 µm) in CBCT; and on the molar, between 47 and 114 µm (median: 46–114 µm) in 3DL, and 91 and 162 µm (median: 93–156 µm) in CBCT. There was a significant difference between the gaps in 3DL and CBCT groups (p < 0.001). FDPs fabricated using 3D laboratory scanner had significantly smaller VMDs. Nevertheless, the 3-unit zirconia FDPs fabricated using CBCT scans presented promising marginal integrity.