The effect of the improperly scanned scan body images on the accuracy of virtual implant positioning in computer-aided design software
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PURPOSE. The aim of this study was to examine the importance of the defect-free scanning of a scan body by assessing the accuracy of virtual implant positioning in computer-aided design (CAD) software when the scan body image is improperly scanned. MATERIALS AND METHODS. A scan body was digitized in a dentiform model using an intraoral scanner, and scanned images with differing levels of image deficiency were generated: 5%, 10%, and 15% deficiency in the flat or rounded area. Using a best-fit image matching algorithm on each of the deficient scan body images, corresponding virtual implants were created. The accuracy of the implant position was evaluated by comparing the linear and angular discrepancies between the actual and virtual positions of the implant. Kruskal-Wallis tests and Mann-Whitney U tests with Bonferroni correction were used to determine the statistical differences among the seven scanned image deficiency groups (α = .05). RESULTS. In general, the linear and angular discrepancies of the implant position in the software increased as the deficiency of the scan body images increased. A 15% scan body image deficiency generated larger discrepancies than deficiency of 5% and 10%. The difference of scan defect position, flat or rounded area, did not affect the accuracy of virtual implant orientation at 5% and 10% deficiency level, but did affect the accuracy at 15% deficiency level. CONCLUSION. Deficiencies in the scanned images of a scan body can decrease the accuracy of the implant positioning in CAD software when the defect is large, thus leading to the incorrect fabrication of implant prostheses.
Abstract
PURPOSE. The aim of this study was to examine the importance of the defect-free scanning of a scan body by assessing the accuracy of virtual implant positioning in computer-aided design (CAD) software when the scan body image is improperly scanned. MATERIALS AND METHODS. A scan body was digitized in a dentiform model using an intraoral scanner, and scanned images with differing levels of image deficiency were generated: 5%, 10%, and 15% deficiency in the flat or rounded area. Using a best-fit image matching algorithm on each of the deficient scan body images, corresponding virtual implants were created. The accuracy of the implant position was evaluated by comparing the linear and angular discrepancies between the actual and virtual positions of the implant. Kruskal-Wallis tests and Mann-Whitney U tests with Bonferroni correction were used to determine the statistical differences among the seven scanned image deficiency groups (α = .05). RESULTS. In general, the linear and angular discrepancies of the implant position in the software increased as the deficiency of the scan body images increased. A 15% scan body image deficiency generated larger discrepancies than deficiency of 5% and 10%. The difference of scan defect position, flat or rounded area, did not affect the accuracy of virtual implant orientation at 5% and 10% deficiency level, but did affect the accuracy at 15% deficiency level. CONCLUSION. Deficiencies in the scanned images of a scan body can decrease the accuracy of the implant positioning in CAD software when the defect is large, thus leading to the incorrect fabrication of implant prostheses.
참고문헌 (32)
- Christensen GJ, "Will digital impressions eliminate the current problems with conventional impressions?", J Am Dent Assoc, 139, pp.761~763 (2008)
- Di Fiore A, "Digital vs conventional workflow for screw-retained single-implant crowns: A comparison of key considerations", Int J Prosthodont, 31, pp.577~579 (2018)
- Haddadi Y, "Evaluation of operating time and patient perception using conventional impression taking and intraoral scanning for crown manufacture: A split-mouth, randomized clinical study", Int J Prosthodont, 31, pp.55~59 (2018)
- Winstanley RB, "The quality of impressions for crowns and bridges received at commercial dental laboratories", Br Dent J, 183, pp.209~213 (1997)
- Christensen GJ, "Impressions are changing: deciding on conventional, digital or digital plus in-office milling", J Am Dent Assoc, 140, pp.1301~1304 (2009)
- Londono J, "Fabrication of a definitive obturator from a 3D cast with a chairside digital scanner for a patient with severe gag reflex : a clinical report", J Prosthet Dent, 114, pp.735~738 (2015)
- Millstein PL, "Determining the accuracy of gypsum casts made from type IV dental stone", J Oral Rehabil, 19, pp.239~243 (1992)
- 김미주, "Comparative clinical study of the marginal discrepancy of fixed dental prosthesis fabricated by the millingsintering method using a presintered alloy", The Journal of Advanced of Prosthodontics, 11(5), pp.280~284 (2019), 대한치과보철학회[DOI]
- Grünheid T, "Clinical use of a direct chairside oral scanner: an assessment of accuracy, time, and patient acceptance", Am J Orthod Dentofacial Orthop, 146, pp.673~682 (2014)
- Flügge TV, "Precision of intraoral digital dental impressions with iTero and extraoral digitization with the iTero and a model scanner", Am J Orthod Dentofacial Orthop, 144, pp.471~478 (2013)
- 전진훈, "Trueness and precision of scanning abutment impressions and stone models according to dental CAD", CAM evaluation standards, 2018, pp.10(5), 335~339[DOI]
- Güth JF, "Accuracy of digital models obtained by direct and indirect data capturing", Clin Oral Investig, 17, pp.1201~1208 (2013)
- Pan S, "Time efficiency and quality of outcomes in a model-free digital workflow using digital impression immediately after implant placement : A double-blind self-controlled clinical trial", Clin Oral Implants Res, 30, pp.617~626 (2019)
- Alsharbaty MHM, "A clinical comparative study of 3-dimensional accuracy between digital and conventional implant impression techniques", J Prosthodont, 28, pp.e902~e908 (2019)
- Fluegge T, "A novel method to evaluate precision of optical implant impressions with commercial scan bodies-An experimental approach", J Prosthodont, 26, pp.34~41 (2017)
- Lee SJ, "Accuracy of digital versus conventional implant impressions", Clin Oral Implants Res, 26, pp.715~719 (2015)
- Keeling A, "Confounding factors affecting the marginal quality of an intra-oral scan", J Dent, 59, pp.33~40 (2017)
- Kim JH, "Quantitative evaluation of common errors in digital impression obtained by using an LED blue light in-office CAD", CAM system, 2015, pp.46, 401~407
- Lee DH, "Digital approach to assessing the 3-dimensional misfit of fixed dental prostheses", J Prosthet Dent, 116, pp.836~839 (2016)
- Chen Y, "Object modelling by registration of multiple range images", Image Vision Comput, 10, pp.145~145 (1992)
- Kim JE, "Accuracy of intraoral digital impressions using an artificial landmark", J Prosthet Dent, 117, pp.755~761 (2017)
- 서상완, "A standardization model based on image recognition for performance evaluation of an oral scanner", The Journal of Advanced of Prosthodontics, 9(6), pp.409~415 (2017), 대한치과보철학회[DOI]
- Andriessen FS, "Applicability and accuracy of an intraoral scanner for scanning multiple implants in edentulous mandibles : a pilot study", J Prosthet Dent, 111, pp.186~194 (2014)
- Haddadi Y, "Effect of software version on the accuracy of an intraoral scanning device", Int J Prosthodont, 31, pp.375~376 (2018)
- Pesce P, "Precision and accuracy of a digital impression scanner in full-arch implant rehabilitation", Int J Prosthodont, 31, pp.171~175 (2018)
- Koch GK, "Accuracy in the digital workflow : From data acquisition to the digitally milled cast", J Prosthet Dent, 115, pp.749~754 (2016)
- Boeddinghaus M, "Accuracy of single-tooth restorations based on intraoral digital and conventional impressions in patients", Clin Oral Investig, 19, pp.2027~2034 (2015)
- Kim RJ, "Accuracy of 9 intraoral scanners for complete-arch image acquisition : A qualitative and quantitative evaluation", J Prosthet Dent, 120, pp.895~903 (2018)
- Hayama H, "Trueness and precision of digital impressions obtained using an intraoral scanner with different head size in the partially edentulous mandible", J Prosthodont Res, 62, pp.347~352 (2018)
- Medina-Sotomayor P, "Accuracy of four digital scanners according to scanning strategy in complete-arch impressions", PLoS One, 13, pp.e0202916~ (2018)
- Müller P, "Impact of digital intraoral scan strategies on the impression accuracy using the TRIOS Pod scanner", Quintessence Int, 47, pp.343~349 (2016)
- Giménez B, "Accuracy of a digital impression system based on active wavefront sampling technology for implants considering operator experience, implant angulation, and depth", Clin Implant Dent Relat Res, 17, pp.e54~e64 (2015)