Magnitude of misfit threshold in implant-supported restorations: A systematic review

Abdelrehim, Aly; Etajuri, Enas Abdalla; Sulaiman, Eshamsul; Sofian, Hazrina; Salleh, Nosizana Mohd

doi:10.1016/j.prosdent.2022.09.010

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…A recent systematic review has shown that 160 μm of vertical and 150 μm of horizontal misfit did not cause complications in implant-supported restorations. 8 Inter-implant distance deviation threshold of 100 μm and angular deviation threshold of 0.4 while digitizing 2 adjacent implants have been reported. 7 When the results of the present study were interpreted based on these reported values, it can be hypothesized that FPDs fabricated with tested scans may have clinically acceptable fit, particularly for Model 1.…”

Section: Discussionmentioning

confidence: 99%

“…Maximum mean 3D distance deviation reported in those studies was 178 μm, 11 which is higher than both maximum median 3D (172.17 μm in Model 3) and inter‐implant (24.92 μm in Model 2) distance deviations measured in the present study. A recent systematic review has shown that 160 μm of vertical and 150 μm of horizontal misfit did not cause complications in implant‐supported restorations 8 . Inter‐implant distance deviation threshold of 100 μm and angular deviation threshold of 0.4° while digitizing 2 adjacent implants have been reported 7 .…”

Section: Discussionmentioning

confidence: 99%

“…Direct digital workflow eliminates shortcomings with conventional impressions, 1 using intraoral scanners (IOSs) and scan bodies (SBs) to acquire the 3‐dimensional (3D) position of the implants 2–5 . However, scan accuracy of IOSs has always been questioned 6 as inaccurate impressions may result in misfit 7 that could lead to screw loosening, screw fracture, chipping of the veneering material, gingival inflammation, bone loss, and implant or prosthesis loss 8 . Therefore, IOS scans should have at least similar accuracy to that of a conventional impression to be routinely used 9 …”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5] However, scan accuracy of IOSs has always been questioned 6 as inaccurate impressions may result in misfit 7 that could lead to screw loosening, screw fracture, chipping of the veneering material, gingival inflammation, bone loss, and implant or prosthesis loss. 8 Therefore, IOS scans should have at least similar accuracy to that of a conventional impression to be routinely used. 9 Trueness (closeness of a measurement to the actual dimensions) and precision (closeness of repetitive measurements to each other) define the accuracy of a scan.…”

Section: Introductionmentioning

confidence: 99%

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Effect of intraoral scanner and fixed partial denture situation on the scan accuracy of multiple implants: An in vitro study

Dönmez

Mathey

Gäumann

et al. 2023

Clin Implant Dent Rel Res

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Background: Accuracy of intraoral implant scans may be affected by the region of the implant and the type of the intraoral scanner (IOSs). However, there is limited knowledge on the scan accuracy of multiple implants placed for an implant-supported fixed partial denture (FPD) in different partially edentulous situations when digitized by using different IOSs.Purpose: To investigate the effect of IOS and FPD situation on the scan accuracy of two implants when partial-arch scans were performed. Materials and Methods: Tissue level implants were placed in 3 maxillary models with implant spaces either at right first premolar and right first molar sites (Model 1, 3-unit FPD), at right canine and right first molar sites (Model 2, 4-unit FPD), or at lateral incisor sites (Model 3, 4-unit FPD). Reference standard tessellation language (STL) files of the models were generated by using an optical scanner (ATOS Capsule 200MV120). Two IOSs (CEREC Primescan [CP] and TRIOS 3 [TR]) were used to perform partial-arch scans (test-scans) of each model (n = 14), which were exported in STL format. A metrology-grade analysis software (GOM Inspect 2018) was used to superimpose test-scan STLs over the reference STL to calculate 3D distance, interimplant distance, and angular (mesiodistal and buccopalatal) deviations. Trueness and precision analyses were performed by using bootstrap analysis of variance followed by Welch tests with Holm correction (α = 0.05).Results: Trueness of the scans was affected by IOS and FPD situation when 3D distance deviations were considered, while inter-implant distance, mesiodistal angular, and buccopalatal angular deviations were only affected by the FPD situation (p < 0.001). Scan precision was affected by the interaction between the IOSs and the FPD situation when 3D distance and buccopalatal angular deviations were

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of intraoral scanner and fixed partial denture situation on the scan accuracy of multiple implants: An in vitro study

Dönmez

Mathey

Gäumann

et al. 2023

Clin Implant Dent Rel Res

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“…In socket-screwdriver constructs, interfacial misfit is an inherent consequence of manufacturing tolerances and design parameters [20,32]. The misfit refers to the variation or mismatch between the socket and screwdriver components, which can affect the performance and stability of the implant.…”

Section: Discussionmentioning

confidence: 99%

Biomechanical Investigation of Bone Screw Head Design for Extracting Stripped Screw Heads: Integration of Mechanical Tests and Finite Element Analyses

et al. 2023

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Enhancing the design of bone screw head sockets to prevent stripping and improve the torque required for smooth unscrewing is a significant challenge in orthopedic applications. This research aims to establish a quantitative methodology by integrating mechanical testing with finite element (FE) simulations to determine a safe limitation depth for the screwdriver when engaging with the hexagonal socket, thus avoiding stripped screw heads. A FE model was developed to investigate the biomechanical responses of the screw head design. Five custom-made hexagonal sockets were manufactured, and single load torsional tests were conducted to assess the mechanical performance of the screws and drivers. The results from the mechanical tests were compared with the FE simulations, demonstrating a close agreement and confirming the model’s validity. Furthermore, additional FE models were created to study the impact of manufacturing tolerances on the socket width and screwdriver width. The findings revealed that the maximum torque to failure for the four designs was lower than the margins specified in ISO 6475. Additionally, increasing the depth of the screwdriver led to higher maximum torque values. This research suggests that the technique of screw insertion, specifically the depth of the driver tool within the screw socket, holds greater importance in preventing stripped screw heads than the design and manufacturing width of the bone screw’s hexagonal socket and screwdriver. This confirms the importance of screwdriver engagement inside the bone screw socket to prevent stripped screw heads and sheds light on the added value of maximum torque prediction for future design modifications.

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Fabrication trueness and internal fit of hybrid abutment crowns fabricated by using additively and subtractively manufactured resins

Demirel

Türksayar

Dönmez

2023

Journal of Dentistry

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Magnitude of misfit threshold in implant-supported restorations: A systematic review

Cited by 16 publications

References 33 publications

Effect of intraoral scanner and fixed partial denture situation on the scan accuracy of multiple implants: An in vitro study

Effect of intraoral scanner and fixed partial denture situation on the scan accuracy of multiple implants: An in vitro study

Biomechanical Investigation of Bone Screw Head Design for Extracting Stripped Screw Heads: Integration of Mechanical Tests and Finite Element Analyses

Fabrication trueness and internal fit of hybrid abutment crowns fabricated by using additively and subtractively manufactured resins

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