Evaluation of marginal and internal gap of three-unit metal framework according to subtractive manufacturing and additive manufacturing of CAD/CAM systems
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PURPOSE. To evaluate the fit of a three-unit metal framework of fixed dental prostheses made by subtractive and additive manufacturing. MATERIALS AND METHODS. One master model of metal was fabricated. Twenty silicone impressions were made on the master die, working die of 10 poured with Type 4 stone, and working die of 10 made of scannable stone. Ten three-unit wax frameworks were fabricated by wax-up from Type IV working die. Stereolithography files of 10 three-unit frameworks were obtained using a model scanner and threedimensional design software on a scannable working die. The three-unit wax framework was fabricated using subtractive manufacturing (SM) by applying the prepared stereolithography file, and the resin framework was fabricated by additive manufacturing (AM); both used metal alloy castings for metal frameworks. Marginal and internal gap were measured using silicone replica technique and digital microscope. Measurement data were analyzed by Kruskal-Wallis H test and Mann-Whitney U-test (α=.05). RESULTS. The lowest and highest gaps between premolar and molar margins were in the SM group and the AM group, respectively. There was a statistically significant difference in the marginal gap among the 3 groups (P<.001). In the marginal area where pontic was present, the largest gap was 149.39 ± 42.30 μm in the AM group, and the lowest gap was 24.40 ± 11.92 μm in the SM group. CONCLUSION. Three-unit metal frameworks made by subtractive manufacturing are clinically applicable. However, additive manufacturing requires more research to be applied clinically.
Abstract
PURPOSE. To evaluate the fit of a three-unit metal framework of fixed dental prostheses made by subtractive and additive manufacturing. MATERIALS AND METHODS. One master model of metal was fabricated. Twenty silicone impressions were made on the master die, working die of 10 poured with Type 4 stone, and working die of 10 made of scannable stone. Ten three-unit wax frameworks were fabricated by wax-up from Type IV working die. Stereolithography files of 10 three-unit frameworks were obtained using a model scanner and threedimensional design software on a scannable working die. The three-unit wax framework was fabricated using subtractive manufacturing (SM) by applying the prepared stereolithography file, and the resin framework was fabricated by additive manufacturing (AM); both used metal alloy castings for metal frameworks. Marginal and internal gap were measured using silicone replica technique and digital microscope. Measurement data were analyzed by Kruskal-Wallis H test and Mann-Whitney U-test (α=.05). RESULTS. The lowest and highest gaps between premolar and molar margins were in the SM group and the AM group, respectively. There was a statistically significant difference in the marginal gap among the 3 groups (P<.001). In the marginal area where pontic was present, the largest gap was 149.39 ± 42.30 μm in the AM group, and the lowest gap was 24.40 ± 11.92 μm in the SM group. CONCLUSION. Three-unit metal frameworks made by subtractive manufacturing are clinically applicable. However, additive manufacturing requires more research to be applied clinically.
참고문헌 (28)
- Ucar Y, "Internal fit evaluation of crowns prepared using a new dental crown fabrication technique: laser-sintered Co-Cr crowns", J Prosthet Dent, 102, pp.253~259 (2009)
- Beschnidt SM, "Evaluation of the marginal accuracy of different all-ceramic crown systems after simulation in the artificial mouth", J Oral Rehabil, 26, pp.582~593 (1999)
- Christensen GJ, "Choosing an all-ceramic restorative material:porcelain-fused-to-metal or zirconia-based?", J Am Dent Assoc, 138, pp.662~665 (2007)
- Gorman CM, "The effect of endodontic access on all-ceramic crowns: A systematic review of in vitro studies", J Dent, 53, pp.22~29 (2016)
- Ferrari M, "Fracture resistance of three porcelainlayered CAD", CAM zirconia frame designs, 2014, pp.30, e163~e168
- Bindl A, "Marginal and internal fit of all-ceramic CAD", CAM crown-copings on chamfer preparations, 2005, pp.32, 441~447
- Quante K, "Marginal and internal fit of metal-ceramic crowns fabricated with a new laser melting technology", Dent Mater, 24, pp.1311~1315 (2008)
- 박진영, "Comparison of prosthetic models produced by traditional and additive manufacturing methods", The Journal of Advanced of Prosthodontics, 7(4), pp.294~302 (2015), 대한치과보철학회[DOI]
- Pradíes G, "Clinical evaluation comparing the fit of all-ceramic crowns obtained from silicone and digital intraoral impressions based on wavefront sampling technology", J Dent, 43, pp.201~208 (2015)
- Sarrett DC, "Prediction of clinical outcomes of a restoration based on in vivo marginal quality evaluation", J Adhes Dent, 9, pp.117~120 (2007)
- Seo D, "The effect of preparation designs on the marginal and internal gaps in Cerec3 partial ceramic crowns", J Dent, 37, pp.374~382 (2009)
- Fransson B, "The fit of metal-ceramic crowns, a clinical study", Dent Mater, 1, pp.197~199 (1985)
- McLean JW, "The estimation of cement film thickness by an in vivo technique", Br Dent J, 131, pp.107~111 (1971)
- Kim CM, "Trueness of milled prostheses according to number of ball-end mill burs", J Prosthet Dent, 115, pp.624~629 (2016)
- Baba NZ, "Materials and processes for CAD", CAM complete denture fabrication, 2016, pp.33, 203~208
- Kim DY, "Reproducibility of different arrangement of resin copings by dental microstereolithography:Evaluating the marginal discrepancy of resin copings", J Prosthet Dent, 117, pp.260~265 (2017)
- van Noort R, "The future of dental devices is digital", Dent Mater, 28, pp.3~12 (2012)
- Wong KV, "A review of additive manufacturing", Mech Eng (2012)[DOI]
- 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)
- Holmes JR, "Considerations in measurement of marginal fit", J Prosthet Dent, 62, pp.405~408 (1989)
- Holmes JR, "Marginal fit of electroformed ceramometal crowns", J Prosthodont, 5, pp.111~114 (1996)
- Beuer F, "Marginal and internal fits of fixed dental prostheses zirconia retainers", Dent Mater, 25, pp.94~102 (2009)
- Laurent M, "Clinical evaluation of the marginal fit of cast crowns-validation of the silicone replica method", J Oral Rehabil, 35, pp.116~122 (2008)
- Molin M, "The fit of gold inlays and three ceramic inlay systems. A clinical and in vitro study", Acta Odontol Scand, 51, pp.201~206 (1993)
- Neves FD, "Microcomputed tomography evaluation of marginal fit of lithium disilicate crowns fabricated by using chairside CAD", CAM systems or the heat-pressing technique, 2014, pp.112, 1134~1140
- Pelekanos S, "Micro-CT evaluation of the marginal fit of different In-Ceram alumina copings", Eur J Esthet Dent, 4, pp.278~292 (2009)
- Kim KB, "Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies", J Prosthet Dent, 112, pp.1432~1436 (2014)
- Berger U, "Aspects of accuracy and precision in the additive manufacturing of plastic gears", J Virtual Phys Prototyp, 10, pp.49~57 (2015)