Impact of number of registration points on the positional accuracy of a prosthetic treatment plan incorporated into a cone beam computed tomography scan by surface scan registration: An in vitro study

Jamjoom, Faris Z.; Yılmaz, Burak; Johnston, William M.

doi:10.1111/clr.13490

Cited by 14 publications

(8 citation statements)

References 23 publications

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“…Because dentition constitutes an optical and radiographic marker, alignment was conducted based on the natural teeth. 32,33 This method may not be appropriate for the mucosa-and bone-supported surgical templates that are used in edentulous patients due to their lack of natural teeth. 34 Further investigations are needed to determine whether other alignment reference points (e.g., xation pins and temporary implants) can be used for the digital registration method.…”

Section: Discussionmentioning

confidence: 99%

Digital versus radiographic evaluation for guided implant surgery: an in vitro study

Wen

et al. 2022

Preprint

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Background: Cone-beam computed tomography (CBCT) is the most widely used method for postsurgical evaluation of the accuracy of guided implant surgery. However, the disadvantages of CBCT include radiation exposure, artifacts caused by metal implants, and high cost. Few studies have introduced a digital registration method to replace CBCT for evaluating the accuracy of guided surgery. The purpose of this study was to compare digital registration to conventional CBCT in terms of the capacity to evaluate the implant positioning accuracy of guided surgery. Materials and Methods: This in vitro study included 40 acrylic resin models with posterior single mandibular tooth loss. Guided surgery software was used to determine the optimal implant position; 40 tooth-supported fully guided drilling templates were designed and milled accordingly. After the guided surgery, the accuracies of the surgical templates were evaluated by conventional CBCT and digital registration. For evaluation by conventional CBCT, postsurgical CBCT scans of the resin models were performed. The CBCT data were reconstructed and superimposed on the implant planning data. For digital registration, we constructed a virtual registration unit that consisted of an implant replica and a scan body. Next, we obtained postsurgical optical scans of resin models with the scan body. The postsurgical implant position was identified by superimposition of the registration unit and optical scan data. The implant planning data and postsurgical implant position data were superimposed; deviations were reported in terms of distance for implant entry/apex point and in terms of angle for the implant axis. Interclass correlation coefficients (ICCs) and Bland–Altman plots were used to analyze the agreement between the two evaluation methods. Results: The ICCs between the two methods were 0.986, 0.993, and 0.968 for the entry point, apex point, and angle, respectively; all were significantly greater than 0.75 (p < 0.001). Bland–Altman plots showed that the 95% limits of agreement of the differences were − 0.144 to + 0.081 mm, − 0.135 to + 0.147 mm, and − 0.451° to + 0.729° for the entry point, apex point, and angle, respectively; all values were within the maximum tolerated difference. Conclusion: Conventional CBCT and digital registration showed good agreement in terms of evaluating the accuracy of implant positioning using tooth-supported surgical templates.

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Section: Discussionmentioning

confidence: 99%

Digital versus radiographic evaluation for guided implant surgery: an in vitro study

Wen

et al. 2022

Preprint

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“…Moreover, small radiopaque objects could be observed in a distorted form on the reconstructed radiographic image in many cases. Image matching largely depends on the outlines of the markers; therefore, the registration accuracy may significantly vary, depending on the numbers, sizes, shapes, and distributions of the markers and different operators 10,17 . In the ES group, the whole surface feature showing a 3D representation of soft tissue was used as the reference region to provide a congruent area for image superimposition.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the Accuracy of Image Registration Methods for Merging Optical Scan and Radiographic Data in Edentulous Jaws

Woo

Mai

Lee

2020

Journal of Prosthodontics

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Purpose: The image registration of optical scans to radiographic images is essential for performing computer-guided implant surgery. This study aimed to evaluate the effect of different image matching conditions on the accuracy of image registration for computer-guided implant surgery in completely edentulous jaws. Materials and Methods: The optical scan image of a completely edentulous study model was registered to the respective cone-beam computed tomography data using three different image matching conditions: small point (SP), large point (LP), and entire surface (ES). For the SP and LP groups, gutta-percha markers (1.0 and 3.0 mm in diameter) were attached to a base template, and a radiopaque impression material was relined on the intaglio surface of template in the ES group. Image registration was performed by 20 operators in the images obtained from each group at an interval of 2 weeks (n = 20 in each group), and the registration accuracy was assessed by calculating the aligned position of the edentulous arch image. One-way analysis of variance with Tukey post hoc tests was used to compare the results among the groups (α = 0.05). Results: The mean registration error was significantly larger in the SP group (0.52 ± 0.19 mm) than in the LP group (0.29 ± 0.08 mm) and ES group (0.27 ±0.06 mm) (F = 24.689, p < 0.001). No difference was found between the LP and ES groups. The image matching discrepancy was more homogeneously distributed on the arch in the ES group than in the other groups. Conclusion: The accuracy of image registration is affected by the size of the congruent area shown in the optical scan and radiographic images. The entire surface-based matching method is more accurate as compared to the small point-based matching method in the image registration for implant planning in full edentulous jaws.

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“…Three 0.5 mm alignment indexes were made on the facial aspects of right second molar, left central incisor, and left second molar teeth with a round bur to facilitate superimpositions. 20 A third-party SB (Elos Accurate Scan Body, IO 2B-B SA; Elos Medtech) was fixed to the implant analog with a screwdriver (Elos Accurate Screwdriver Manual Short 0.9 Hex; Elos Medtech, Göteborg, Sweden) and tightened with a torque wrench (Nobel Biocare Prosthetic Manual Torque Wrench; Nobel Biocare) at 5 Ncm. MRM was then digitized by using a laboratory scanner (3Shape D2000; 3Shape), 7,[21][22][23][24] which has an accuracy of 5 μm 25 to generate the standard tessellation language (STL) file of the MRM (M0).…”

Section: Methodsmentioning

confidence: 99%

Influence of digital implant analog design on the positional trueness of an analog in additively manufactured models: An in‐vitro study

Mata‐Mata¹,

Dönmez

Meirelles

et al. 2022

Clin Implant Dent Rel Res

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Background Limited evidence exists regarding the accuracy of implant analog position in printed models, particularly when implant analogs with varying designs are used. Purpose To evaluate the effect of digital implant analog (DIA) design on the trueness of their position in additively manufactured digital implant models (DIMs) and to compare with that of a conventional implant analog in a stone cast. Materials and Methods A dentate maxillary model with a conventional implant analog (Nobel Biocare Implant Replica 4.3 mm CC RP) at left second premolar site was digitized by using a laboratory scanner (3Shape D2000) and a (SB) scan body to generate the master standard tessellation language (STL) file (M0). 12 custom trays were fabricated on M0 file and conventional polyvinylsiloxane impressions of the model were made. All impressions were poured after inserting conventional implant analogs (Nobel RP Implant Replica) (Group A). Model was then digitized with an intraoral scanner (TRIOS 3) and the same SB, and DIMs with three different DIA designs (Nobel Biocare [Group B], Elos [Group C], and NT‐trading [Group D]) were generated (Dental System‐Model Builder). 12 DIMs of each design were additively manufactured and corresponding DIAs were inserted. All models were digitized by using the same laboratory scanner and SB, and these STLs were transferred to a 3D analysis software (Geomagic Control X), where the STL files of the models were superimposed over M0. Linear and 3D deviations at three selected points on SB (implant‐abutment connection, most cervical point on SB, and most coronal point on SB) as well as angular deviations on two planes (buccolingual and mesiodistal) were calculated. Analysis of variance (ANOVA) and Bonferroni corrected t‐tests were used to analyze the trueness of implant analog positions (α = 0.05). Results The interaction of main effects significantly affected linear (p < 0.001) and angular deviations (p = 0.020). At point 1, group D had higher deviations than groups A and B (p ≤ 0.015). In addition, groups A and D had higher deviations than group B at point 4 (p < 0.001). While group C had similar linear deviations to those of other groups at point 1 and point 4 (p ≥ 0.192), the differences among test groups at point 2 were nonsignificant (p ≥ 0.276). Group B had lower angular deviations than groups C (p = 0.039) and D (p = 0.006) on buccolingual plane. Conclusions Analog design affected the trueness of analog position as proprietary, pressure/friction fit DIA (group B) had higher linear trueness than screw‐retained DIA (Group D) and conventional implant analog (group A). In addition, pressure/friction fit DIA had the highest angular trueness among tested DIAs.

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Impact of number of registration points on the positional accuracy of a prosthetic treatment plan incorporated into a cone beam computed tomography scan by surface scan registration: An in vitro study

Cited by 14 publications

References 23 publications

Digital versus radiographic evaluation for guided implant surgery: an in vitro study

Digital versus radiographic evaluation for guided implant surgery: an in vitro study

Comparison of the Accuracy of Image Registration Methods for Merging Optical Scan and Radiographic Data in Edentulous Jaws

Influence of digital implant analog design on the positional trueness of an analog in additively manufactured models: An in‐vitro study

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