Evaluation of marginal discrepancy in metal frameworks fabricated by sintering-based computer-aided manufacturing methods
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
PURPOSE. The aim of this in vitro study was to evaluate the effect of sintering procedures on marginal discrepancies of fixed partial metal frameworks fabricated using different sintering-based computer-aided design and computer/aided manufacturing (CAD/CAM) techniques. MATERIALS AND METHODS. Forty resin die models of prepared premolar and molar abutment teeth were fabricated using a three-dimensional (3D) printer and divided into four groups (n = 10) according to the fabrication method of metal frameworks used: HM (via hard milling), SM (via soft metal milling), L25 (via direct metal laser melting [DMLM] with a 25 μm layer thickness), and L50 (via direct DMLM with a 50 μm layer thickness). After the metal frameworks were fabricated and cemented, five vertical marginal discrepancy measurements were recorded in each site (i.e., buccal, facing the pontic, lingual, and facing away from the pontic) of both abutment teeth under a stereomicroscope (×40). Data were statistically analyzed at a significance level of 0.05. RESULTS. No statistically significant differences (P>.05) were found among the four axial sites of metal frameworks fabricated by sintering-based CAD/CAM techniques. The HM and L25 groups showed significantly (P<.001) lower marginal discrepancy values than the SM and L50 groups. CONCLUSION. Marginal discrepancy in the sites facing the pontic was not influenced by the type of sintering procedure. All fabrication methods exhibited clinically acceptable results in terms of marginal discrepancies.
Abstract
PURPOSE. The aim of this in vitro study was to evaluate the effect of sintering procedures on marginal discrepancies of fixed partial metal frameworks fabricated using different sintering-based computer-aided design and computer/aided manufacturing (CAD/CAM) techniques. MATERIALS AND METHODS. Forty resin die models of prepared premolar and molar abutment teeth were fabricated using a three-dimensional (3D) printer and divided into four groups (n = 10) according to the fabrication method of metal frameworks used: HM (via hard milling), SM (via soft metal milling), L25 (via direct metal laser melting [DMLM] with a 25 μm layer thickness), and L50 (via direct DMLM with a 50 μm layer thickness). After the metal frameworks were fabricated and cemented, five vertical marginal discrepancy measurements were recorded in each site (i.e., buccal, facing the pontic, lingual, and facing away from the pontic) of both abutment teeth under a stereomicroscope (×40). Data were statistically analyzed at a significance level of 0.05. RESULTS. No statistically significant differences (P>.05) were found among the four axial sites of metal frameworks fabricated by sintering-based CAD/CAM techniques. The HM and L25 groups showed significantly (P<.001) lower marginal discrepancy values than the SM and L50 groups. CONCLUSION. Marginal discrepancy in the sites facing the pontic was not influenced by the type of sintering procedure. All fabrication methods exhibited clinically acceptable results in terms of marginal discrepancies.
참고문헌 (36)
- Roberts HW, "Metalceramic alloys in dentistry : a review", J Prosthodont, 18, pp.188~194 (2009)
- Willer J, "Computer-assisted milling of dental restorations using a new CAD", CAM data acquisition system, 1998, pp.80, 346~353
- Bindl A, "Marginal and internal fit of all-ceramic CAD", CAM crown-copings on chamfer preparations, 2005, pp.32, 441~447
- Kokubo Y, "Clinical marginal and internal gaps of zirconia all-ceramic crowns", J Prosthodont Res, 55, pp.40~43 (2011)
- Yeo IS, "In vitro marginal fit of three all-ceramic crown systems", J Prosthet Dent, 90, pp.459~464 (2003)
- Strub JR, "Computer-aided design and fabrication of dental restorations : current systems and future possibilities", J Am Dent Assoc, 137, pp.1289~1296 (2006)
- Kaleli N, "Influence of porcelain firing and cementation on the marginal adaptation of metal-ceramic restorations prepared by different methods", J Prosthet Dent, 117, pp.656~661 (2017)
- van Noort R, "The future of dental devices is digital", Dent Mater, 28, pp.3~12 (2012)
- Örtorp A, "The fit of cobalt-chromium three-unit fixed dental prostheses fabricated with four different techniques : a comparative in vitro study", Dent Mater, 27, pp.356~363 (2011)
- Ekren O, "Effect of layered manufacturing techniques, alloy powders, and layer thickness on metalceramic bond strength", J Prosthet Dent, 119, pp.481~487 (2018)
- Santos EC, "Rapid manufacturing of metal components by laser forming", Int J Mach Tools Manufact, 46, pp.1459~1468 (2006)
- Koutsoukis T, "Selective laser melting technique of Co-Cr dental alloys : A review of structure and properties and comparative analysis with other available techniques", J Prosthodont, 24, pp.303~312 (2015)
- Mazzoli A, "Selective laser sintering in biomedical engineering", Med Biol Eng Comput, 51, pp.245~256 (2013)
- 배은정, "Bond and fracture strength of metalceramic restorations formed by selective laser sintering", The Journal of Advanced of Prosthodontics, 6(4), pp.266~271 (2014), 대한치과보철학회[DOI]
- Chockalingam K, "Influence of layer thickness on mechanical properties in stereolithography", Rapid Prototyping J, 12, pp.106~113 (2006)
- Mercelis P, "Residual stresses in selective laser sintering and selective laser melting", Rapid Prototyping J, 12, pp.254~265 (2006)
- Sames WJ, "The metallurgy and processing science of metal additive manufacturing", Int Mater Rev, 61, pp.315~360 (2016)
- Schaub DA, "Optimizing stereolithography throughput", J Manuf Syst, 16, pp.290~303 (1997)
- Withers PJ, "Residual stress Part II-nature and origins", Mater Sci Technol, 17, pp.366~375 (2001)
- Tara MA, "Clinical outcome of metal-ceramic crowns fabricated with laser-sintering technology", Int J Prosthodont, 24, pp.46~48 (2011)
- Sun J, "The application of rapid prototyping in prosthodontics", J Prosthodont, 21, pp.641~644 (2012)
- Kim EH, "A microcomputed tomography evaluation of the marginal fit of cobalt-chromium alloy copings fabricated by new manufacturing techniques and alloy systems", J Prosthet Dent, 117, pp.393~399 (2017)
- Hugo Lambert, "Dental biomaterials for chairside CAD", CAM: State of the art, 2017, pp.9(6), 486~495[DOI]
- Park JK, "Evaluation of the fit of metal ceramic restorations fabricated with a pre-sintered soft alloy", J Prosthet Dent, 116, pp.909~915 (2016)
- Stawarczyk B, "A novel CAD", CAM base metal compared to conventional CoCrMo alloys: an in-vitro study of the long-term metal-ceramic bond strength, 2014, pp.13, 446~452
- Wettstein F, "Clinical study of the internal gaps of zirconia and metal frameworks for fixed partial dentures", Eur J Oral Sci, 116, pp.272~279 (2008)
- Büchi DL, "Marginal and internal fit of curved anterior CAD", CAM-milled zirconia fixed dental prostheses : an in-vitro study, 2014, pp.45, 837~846
- Komine F, "Influence of framework configuration on the marginal adaptation of zirconium dioxide ceramic anterior four-unit frameworks", Acta Odontol Scand, 63, pp.361~366 (2005)
- Conrad HJ, "Current ceramic materials and systems with clinical recommendations : a systematic review", J Prosthet Dent, 98, pp.389~404 (2007)
- Kocaağaoğlu H, "In vitro evaluation of marginal, axial, and occlusal discrepancies in metal ceramic restorations produced with new technologies", J Prosthet Dent, 116, pp.368~374 (2016)
- Sulaiman F, "A comparison of the marginal fit of In-Ceram, IPS Empress, and Procera crowns", Int J Prosthodont, 10, pp.478~484 (1997)
- McLean JW, "The estimation of cement film thickness by an in vivo technique", Br Dent J, 131, pp.107~111 (1971)
- Pasali B, "Evaluation of marginal fit of single implant-supported metal-ceramic crowns prepared by using presintered metal blocks", J Prosthet Dent, 119, pp.257~262 (2018)
- Vojdani M, "A comparison of the marginal and internal fit of cobaltchromium copings fabricated by two different CAD", CAM systems(CAD, Ceramill Sintron), pp.J Dent(Shiraz), 2016[DOI]
- Kaleli N, "Effect of layer thickness on the marginal and internal adaptation of laser-sintered metal frameworks", J Prosthet Dent, 121, pp.922~928 (2019)
- Gu D, "Balling phenomena in direct laser sintering of stainless steel powder : Metallurgical mechanisms and control methods", Mater Des, 30, pp.2903~2910 (2009)