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    Comparison of reliability of 3 resonance frequency analysis devices: An in vitro study
    (Silver Chair İnformation Systems, 2022) Diker, Burcu; Diker, Nurettin; Tak, Önjen
    The purpose of the present study was to investigate the intraobserver and interobserver reliability of 3 resonance frequency analysis (RFA) devices and to compare the implant stability quotient (ISQ) values according to implant macro design and diameter in 2 different bone densities. A total of 64 implants (Neoss ProActive; Neoss; Harrogate, UK) of varying diameters (3.5 and 4.0 mm) and implant macro design (tapered and straight) were placed in 2 artificial bone blocks (the density of type 2 and 3). The implant primary stability was measured using Osstell IDx (Osstell; Göteborg, Sweden), Osstell Beacon and Penguin RFA (Integration Diagnostics; Göteborg, Sweden). The ISQ value of each implant was measured by 2 observers and recorded 5 times in 2 directions. The intraobserver and interobserver reliability of RFA devices were evaluated. In addition to that, mean ISQ values were calculated for each RFA device to evaluate the effect of implant diameter, implant macro design, and bone density on ISQ values. ISQ values were significantly higher for implants placed within the type 2 bone than for the type 3 bone. The 4.0-mm diameter implants presented higher ISQ values than 3.5-mm diameter implants. The intraclass correlation coefficient (ICC) values for intraobserver reliability were above 0.85 for each observer and the ICC values for interobserver reliability were 0.94, 0.93, and 0.98 for Osstell IDx, Osstell Beacon, and Penguin RFA, respectively. Although there was excellent interobserver reliability with 3 RFA devices, the intraobserver reliability of Osstell Beacon and Penguin RFA were slightly better than Osstell IDx. Bone density and implant diameter were parameters affecting the primary stability of implants.
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    Effect of different composite resin materials used as core buildups on the trueness of intraoral scanning
    (QUINTESSENCE PUBLISHING CO INC, 2021) Elter, Bahar; Diker, Burcu; Tak, Önjen
    Purpose: To evaluate the trueness of digital impressions of different composite resin materials that can be used for core buildups in clinical practice. Materials and Methods: A maxillary central incisor was prepared and scanned with an intraoral scanner (Primescan, Dentsply Sirona). Ten composite resin specimens (in three groups: universal composite; flowable composite; and bulk fill composite) were milled in the same dimensions of the prepared tooth and scanned. The data of the prepared tooth were used as reference, and the data obtained from the composite resin specimens were aligned using an evaluation software (Geomagic Studio 12) to determine deviation values. Kruskal-Wallis with Dunn post hoc test was performed to compare differences among the composite resin groups (alpha = .05). Results: There were significant differences in the trueness of digital impressions between some composite resin groups (P < .05). The mean trueness deviation values were in the range of 12.75 mu m (G-aenial Posterior) to 17.06 mu m (Filtek Bulk Fill Posterior). The trueness of G-aenial Posterior (12.75 mu m) was higher than that of Core-X Flow (14.62 mu m), Clearfil Majesty Flow (16.93 mu m), and Filtek Bulk Fill Posterior (17.06 mu m). Filtek Bulk Fill Posterior exhibited lower trueness than Clearfil Majesty Esthetic (12.93 mu m), Clearfil Majesty Posterior (13.50 mu m), and Charisma Classic (13.81 mu m). Conclusion: Different composite resins used for core buildup can impact the trueness of digital impressions, with universal composite resin scans being the truest compared to flowable and bulk fill composite resin scans. All scanned substrate groups can be regarded as within a clinically acceptable range.
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    The trueness of an intraoral scanner in scanning different post space depths
    (Elsevier Science, 2022) Elter, Bahar; Diker, Burcu; Tak, Önjen
    The trueness of an intraoral scanner in scanning different post space depths