Browsing by Author "Reiss, Natalia"

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Effect Of Different Implant Locations And Abutment Types On Stress And Strain Distribution Under Non-Axial Loading: A 3-Dimensional Finite Element Analysis
(JOURNAL OF DENTAL SCIENCES, 2024-02-27) Sakar, Didem; Guncu, Mustafa Baris; Arikan, Hale; Muhtarogullari, Mehmet; Aktas, Guliz; Reiss, Natalia; Turkyilmaz, Ilser
Background/purpose: Dental implants have been a popular treatment for replacing missing teeth. The purpose of this study was to investigate the impact of engaging (hexagonal) and non -engaging (non -hexagonal) abutments in various six -unit fixed prosthesis on the stress distribution and loading located in the implant neck, implant abutment, and surrounding bone. Materials and methods: Three implants were digitally designed and inserted parallel to each other in edentulous sites of the maxillary right canine, maxillary right central incisor, and maxillary left canine. Titanium base engaging abutments, non -engaging abutments and connecting screws were designed. Five distinct models of 6 -unit fixed dental prosthesis were created, each featuring different combinations of various abutments. Forces (45 -degree angle) were applied to the prosthesis, allowing for the analysis of the stress distribution on the implant neck and abutments, and the maximum and minimum principal stress values on the cortical and trabecular bone. Results: Von Mises stress values and stress distributions located in the implant neck region due to the applied loading forces were analyzed. The overall stress values were highest while employing the hexagonal abutments. The maxillary left canine with a hexagonal abutment (model 5) reported the highest von mises value (64.71 MPa) while the maxillary right canine with a non -hexagonal abutment (model 4) presented lowest von mises value (56.69 MPa). Conclusion: The results suggest that both the various abutment combinations (engaging and
Influence of the Implant Scan Body Modifications on Trueness of Digital Impressions
(2023) Uzel, Sema Merve; Guncu, Mustafa Baris; Aktas, Guliz; Arikan, Hale; Reiss, Natalia; Turkyilmaz, Ilser; 37799878; JXY-2357-2024
Background/purpose: Effects of implant angulation on digital impression accuracy remain controversial. The purpose of this study was to assess the relationship between the alteration of implant scan bodies and the trueness of digital impressions. Materials and methods: A maxillary typodont without the right premolars and first molar was scanned with a laboratory scanner and saved as a standard triangular language (STL) file. A model from the STL file was fabricated with a 3-dimensional printer. Two implants were placed into the first premolar and first molar sites of the model, followed by the insertion of two scan bodies onto the implants. These scan bodies were divided into four test groups, based on the surface modifications. A digital impression of each typodont was made with three different intraoral scanners. An abutment was digitally seated on each implant. 120 STL files (30 for each group) of the typodont with two implants and two corresponding abutments were used for statistical analysis. Results: A total of 240 values (two implants for each typodont) were obtained after each sample (4 groups) was scanned 10 times by utilizing three intraoral scanners. The overall linear and angular discrepancies were analyzed. Group 1 showed the lowest linear discrepancy of 14.9 +/- 5.4 mm while Group 4 reported the highest linear discrepancy of 137.5 +/- 41.7 mm, yielding a statistical significance (P < 0.05). Conclusion: It has been concluded that the more adjustments made to the scan bodies, the greater the linear and angular deviations occur, compromising the trueness of the digital implant impression. (c) 2023 Association for Dental Sciences of the Republic of China. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons. org/licenses/by-nc-nd/4.0/).