Evaluation of marginal and internal gaps in single and three-unit metal frameworks made by micro-stereolithography
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PURPOSE. The purpose of this study is to compare single and three-unit metal frameworks that are produced by micro-stereolithography. MATERIALS AND METHODS. Silicone impressions of a selected molar and a premolar were used to make master abutments that were scanned into a stereolithography file. The file was processed with computer aided design software to create single and three-unit designs from which resin frameworks were created using micro-stereolithography. These resin frameworks were subjected to investment, burnout, and casting to fabricate single and three-unit metal ones that were measured under a digital microscope by using the silicone replica technique. The measurements were verified by means of the Mann–Whitney U test (α=.05). RESULTS. The marginal gap was 101.9 ± 53.4 μm for SM group and 104.3 ± 62.9 μm for TUM group. The measurement of non-pontics in a single metal framework was 93.6 ± 43.9 μm, and that of non-pontics in a three-unit metal framework was 64.9 ± 46.5 μm. The dimension of pontics in a single metal framework was 110.2 ± 61.4 μm, and that of pontics in a three-unit metal framework was 143.7 ± 51.8 μm. CONCLUSION. The marginal gap was smaller for the single metal framework than for the three-unit one, which requires furtherimprovement before it can be used for clinical purposes.
Abstract
PURPOSE. The purpose of this study is to compare single and three-unit metal frameworks that are produced by micro-stereolithography. MATERIALS AND METHODS. Silicone impressions of a selected molar and a premolar were used to make master abutments that were scanned into a stereolithography file. The file was processed with computer aided design software to create single and three-unit designs from which resin frameworks were created using micro-stereolithography. These resin frameworks were subjected to investment, burnout, and casting to fabricate single and three-unit metal ones that were measured under a digital microscope by using the silicone replica technique. The measurements were verified by means of the Mann–Whitney U test (α=.05). RESULTS. The marginal gap was 101.9 ± 53.4 μm for SM group and 104.3 ± 62.9 μm for TUM group. The measurement of non-pontics in a single metal framework was 93.6 ± 43.9 μm, and that of non-pontics in a three-unit metal framework was 64.9 ± 46.5 μm. The dimension of pontics in a single metal framework was 110.2 ± 61.4 μm, and that of pontics in a three-unit metal framework was 143.7 ± 51.8 μm. CONCLUSION. The marginal gap was smaller for the single metal framework than for the three-unit one, which requires furtherimprovement before it can be used for clinical purposes.
참고문헌 (23)
- Al Jabbari YS, "Metallurgical and interfacial characterization of PFM Co-Cr dental alloys fabricated via casting, milling or selective laser melting", Dent Mater, 30, pp.e79~e88 (2014)
- Kim KB, "An evaluation of marginal fit of three-unit fixed dental prostheses fabricated by direct metal laser sintering system", Dent Mater, 29, pp.e91~e96 (2013)
- Quante K, "Marginal and internal fit of metal-ceramic crowns fabricated with a new laser melting technology", Dent Mater, 24, pp.1311~1315 (2008)
- Galindo DF, "Effect of soldering on metal-porcelain bond strength in repaired porcelain-fused-to-metal castings", J Prosthet Dent, 85, pp.88~94 (2001)
- Zhao H, "Cracking of porcelain coatings bonded to metal substrates of different modulus and hardness", J Mater Res, 16, pp.1471~1478 (2001)
- Kokubo Y, "Clinical marginal and internal gaps of Procera AllCeram crowns", J Oral Rehabil, 32, pp.526~530 (2005)
- McLean JW, "The estimation of cement film thickness by an in vivo technique", Br Dent J, 131, pp.107~111 (1971)
- Ng J, "A comparison of the marginal fit of crowns fabricated with digital and conventional methods", J Prosthet Dent, 112, pp.555~560 (2014)
- 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)
- 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]
- 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)
- van Noort R, "The future of dental devices is digital", Dent Mater, 28, pp.3~12 (2012)
- 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)
- Kim CM, "Trueness of milled prostheses according to number of ball-end mill burs", J Prosthet Dent, 115, pp.624~629 (2016)
- Grant GT, "Direct digital manufacturing. Clinical applications of digital dental technology hoboken", pp.41~57 (2015), Wiley-Blackwell
- Berger U, "Aspects of accuracy and precision in the additive manufacturing of plastic gears", Virtual Phys Prototyp, 10, pp.49~57 (2015)
- Leigh SJ, "A miniature flow sensor fabricated by micro-stereolithography employing a magnetite", acrylic nanocomposite resin, 2011, pp.168, 66~71
- Schuster M, "Biofunctional photopolymers for Micro-Stereolithography", Proceedings of the 8th International Symposium on Laser Precision Microfabrication, pp.1~5 (2007)
- Sayed NM, "Shear bond strength and failure mode between veneering ceramic and metal cores after multiple firing cycles", Egyptian Dent J, 61, pp.659~666 (2015)
- Soliman MSM, "Effect of different cement spaces on the vertical marginal gap of full anatomical zirconia bridges", J Am Sci, 11, pp.145~152 (2015)
- Dental Materials Research, "50th Anniversary symposium, National bureau of standards special publication No. 354, Oct., 6 to 8, 1969, Gaithersburg", 61~66 (1972)
- Kul E, "Comparison of the metal-ceramic bond after recasting and after laser sintering", J Prosthet Dent, 114, pp.109~113 (2015)
- 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)