Details

Autor(en) / Beteiligte

• Belgin, Hüseyin Berkay
• Kale, Ediz
• Özçelik, Tuncer Burak
• Yilmaz, Burak

Titel

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

Ist Teil von

• Odontology, 2022-04, Vol.110 (2), p.339-348

Ort / Verlag

Singapore: The Society of the Nippon Dental University

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Abstract] 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.