Comparison of Intaglio Surface Adjustment in the Oral Cavity for Lithium Disilicate Crowns Fabricated Using Different Scanners

Abstract

Purpose A clinical study to evaluate the intraoral adjustment of crowns fabricated using different scanners. Materials and Methods A total of 15 patients requiring single ceramic crowns were recruited. Impressions were made according to four protocols: a conventional approach and using three intraoral scanners (IOSs) (CS3600 (Carestream Dental, Atlanta, GA), i500 (Medit, Seoul, Republic of Korea), and EZIS PO (DDS, Seoul, Republic of Korea)). Four crowns per patient were fabricated using lithium disilicate ceramic. An experienced dentist performed the internal adjustment in the oral cavity. Three‐dimensional analysis was conducted using an inspection software program (Geomagic Control X; 3D Systems, Rock Hill, SC). Statistical analysis was conducted using one‐way analysis of variance and Tukey's honest significance difference tests (α = 0.05). Results A significant difference was observed in the intraoral adjustment among the conventional approach and the three IOSs (F = 213.7, p < 0.001). Crowns fabricated by conventional impressions (20.1 ± 1.4 µm) displayed better three‐dimensional conformity before and after intraoral adjustment than IOS groups (29.6 ± 4.3 µm) (p < 0.001). Conclusions Crowns fabricated using conventional impressions required fewer intraoral adjustments of the intaglio surface than those fabricated using IOSs.

Feasibility of using an intraoral scanner for a complete arch digital scan, part 2: A comparison of scan strategies

“…Scan accuracy for fixed dental prostheses has been assessed. [10][11][12][13][14] From a clinical study, Lee et al 13 reported that IOSs influence the marginal and internal fit of fixed dental prostheses. Moreover, clinically acceptable scan accuracy to within 100 mm for fixed dental prostheses has been reported.…”

Marginal and internal fit and intaglio surface trueness of interim crowns fabricated from tooth preparation of four finish line locations

“…Wang et al 20 evaluated the intaglio surface trueness of zirconia crowns fabricated with 3D printing and verified the volumetric stability of the fabricated zirconia crowns. In a previous clinical study, virtual models of crowns before and after intraoral adjustment were superimposed to assess intaglio surface trueness, and the intraoral adjustment of crowns was verified 21 . In this study, to evaluate the effect of the four finish line locations, crowns fabricated in four finish line locations and crowns designed in a reference tooth preparation were superimposed and the intaglio surface trueness was evaluated (Fig.…”

“…Previous studies have evaluated 3D trueness to verify the dimensional change of the intaglio surface of the fabricated dental prosthesis 17 – 19 . Previous studies can be different depending on what is designated as a reference model, such as the manufacturing precision of 3D printers 20 and the adjustment of the intaglio surface of the crown in the oral cavity 21 .…”

Marginal and internal fit and intaglio surface trueness of interim crowns fabricated from tooth preparation of four finish line locations

“…Wang et al [20] evaluated the intaglio surface trueness of zirconia crowns fabricated with 3D printing and veri ed the volumetric stability of the fabricated zirconia crowns. In a previous clinical study, virtual models of crowns before and after intraoral adjustment were superimposed to assess intaglio surface trueness, and the intraoral adjustment of crowns was veri ed [21]. In this study, to evaluate the effect of the four nish line locations, crowns fabricated in four nish line locations and crowns designed in a reference tooth preparation were superimposed and the intaglio surface trueness was evaluated (Fig.…”

“…Previous studies have evaluated 3D trueness to verify the dimensional change of the intaglio surface of the fabricated dental prosthesis [17][18][19]. Previous studies can be different depending on what is designated as a reference model, such as the manufacturing precision of 3D printers [20] and the adjustment of the intaglio surface of the crown in the oral cavity [21].…”