Objective: Along with developing technology, digital methods have begun being used for the production of metal-ceramic systems. However, there are very few studies that investigate the changes of the marginal discrepancy during porcelain processes. The aim of the study is to compare the marginal discrepancy of metal-ceramic restorations produced by the direct metal laser sintering (DMLS) method using metal powders before and after the porcelain applying process. Material and Methods: A four-unit fixed restoration was designed at the right maxilla between the first premolar and second molar teeth. A total of 10 restorations were produced with the DMLS method. The marginal and internal gap was measured twice using the silicone replica technique, before and after the porcelain processes. Under a stereomicroscope, measurements were made from the mesial, occlusal, and distal surfaces, with 21 measurements from each sample. Statistical analysis was performed and p<0.05 was considered statistically significant. Result: At the molar tooth, a statistically significant increase in marginal discrepancy was observed at the mesial region (p<0.001) and at the occlusal region (p<0.001). At the premolar tooth, a statistically significant decrease in marginal discrepancy was observed at the mesial region (p<0.001), and an increase was observed at the occlusal region (p<0.001). Conclusion: The results of our study; It shows that 4-units metalceramic restorations, whose metal substructures are produced by the DMLS technique, can create marginal and internal discrepancy above clinically acceptable limits.
Keywords: Direct metal laser sintering; metal-ceramic crown; silicone replica technique; marginal discrepancy
Amaç: Gelişen teknoloji ile birlikte metal-seramik sistemlerin üretiminde dijital yöntemler kullanılmaya başlanmıştır. Ancak marjinal uyumsuzluğun porselen uygulama öncesi ve sonrası arasındaki değişimini araştıran çok az sayıda çalışma bulunmaktadır. Bu çalışmanın amacı, direkt metal lazer sinter (DMLS) yöntemi ile üretilen metal-seramik restorasyonların porselen uygulama işlemi öncesi ve sonrası marjinal uyumsuzluklarının karşılaştırılmasıdır. Gereç ve Yöntemler: Sağ maksillada 1. Premolar ve 2. molar dişleri arasında 4 üyeli sabit restorasyon tasarlandı. DMLS yöntemi ile toplam 10 adet restorasyon üretildi. Marjinal ve internal uyum silikon replika tekniği kullanılarak, porselen işlemlerinden önce ve sonra olmak üzere 2 kez ölçüldü. Bir stereomikroskop altında, her numuneden 21 ölçüm olmak üzere mesiyal, okluzal ve distal yüzeylerden ölçümler yapıldı. İstatistiksel analiz yapıldı ve p<0,05 istatistiksel olarak anlamlı kabul edildi. Bulgular: Molar diş, mesiyal bölgede (p<0,001) ve okluzal bölgede (p<0,001) marjinal uyumsuzlukta istatistiksel olarak anlamlı bir artış gözlendi. Premolar diş, mesiyal bölgede marjinal uyumsuzlukta istatistiksel olarak anlamlı bir azalma (p<0,001), okluzal bölgede artış (p<0,001) gözlendi. Sonuç: Çalışmamızın sonuçları; DMLS tekniğiyle metal alt yapıları üretilen 4 üyeli metal seramik restorasyonlarda klinik olarak kabul edilebilir sınırların üzerinde marjinal ve internal uyumsuzluğun olabileceğini göstermektedir.
Anahtar Kelimeler: Direkt metal lazer sinter; metal-seramik kron; silikon replika teknik; marjinal uyum
- Tamac E, Toksavul S, Toman M. Clinical marginal and internal adaptation of CAD/CAM milling, laser sintering, and cast metal ceramic crowns. J Prosthet Dent. 2014;112(4):909-13. [Crossref] [PubMed]
- Kaleli N, Saraç D. Influence of porcelain firing and cementation on the marginal adaptation of metal-ceramic restorations prepared by different methods. J Prosthet Dent. 2017;117(5):656-61. [Crossref] [PubMed]
- Kim KB, Kim JH, Kim WC, Kim JH. Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies. J Prosthet Dent. 2014;112(6):1432-6. [Crossref] [PubMed]
- Zeng L, Zhang Y, Liu Z, Wei B. Effects of repeated firing on the marginal accuracy of Co-Cr copings fabricated by selective laser melting. J Prosthet Dent. 2015;113(2):135-9. [Crossref] [PubMed]
- Xu D, Xiang N, Wei B. The marginal fit of selective laser melting-fabricated metal crowns: an in vitro study. J Prosthet Dent. 2014;112(6):1437-40. [Crossref] [PubMed]
- ANSI/ADA. ANSI/ADA Specification No. 96. Dental Water-based Cements: 2012. [Link]
- Kane LM, Chronaios D, Sierraalta M, George FM. Marginal and internal adaptation of milled cobalt-chromium copings. J Prosthet Dent. 2015;114(5):680-5. [Crossref] [PubMed]
- Örtorp A, Jönsson D, Mouhsen A, Vult von Steyern P. The fit of cobalt-chromium three-unit fixed dental prostheses fabricated with four different techniques: a comparative in vitro study. Dent Mater. 2011;27(4):356-63. [Crossref] [PubMed]
- Kim KB, Kim WC, Kim HY, Kim JH. An evaluation of marginal fit of three-unit fixed dental prostheses fabricated by direct metal laser sintering system. Dent Mater. 2013;29(7):e91-6. [Crossref] [PubMed]
- Kim KB, Kim JH, Kim WC, Kim HY, Kim JH. Evaluation of the marginal and internal gap of metal-ceramic crown fabricated with a selective laser sintering technology: two- and three-dimensional replica techniques. J Adv Prosthodont. 2013;5(2):179-86. [Crossref] [PubMed] [PMC]
- Buchanan WT, Svare CW, Turner KA. The effect of repeated firings and strength on marginal distortion in two ceramometal systems. J Prosthet Dent. 1981;45(5):502-6. [Crossref] [PubMed]
- Akçin ET, Güncü MB, Aktaş G, Aslan Y. Effect of manufacturing techniques on the marginal and internal fit of cobalt-chromium implant-supported multiunit frameworks. J Prosthet Dent. 2018;120(5):715-20. [Crossref] [PubMed]
- Daou EE, Baba NZ. Fit Alteration of presintered Co-Cr and zirconia multiple-unit prostheses after ceramic layering. J Prosthodont. 2021;30(9):789-94. [Crossref] [PubMed]
- Gautam N, Khajuria RR, Ahmed R, Sharma S, Hasan S, Hasan S. A comparative evaluation of marginal accuracy of Co-Cr metal copings fabricated using traditional casting techniques and metal laser sintering. Int J Clin Pediatr Dent. 2021;14(1):128-32. [Crossref] [PubMed] [PMC]
- Daou EE. X-ray microtomographic evaluation of the absolute marginal fit of fixed prostheses made from soft Co-Cr and zirconia. J Prosthet Dent. 2022;127(2):289-94. [Crossref] [PubMed]
- Persson A, Andersson M, Oden A, Sandborgh-Englund G. A three-dimensional evaluation of a laser scanner and a touch-probe scanner. J Prosthet Dent. 2006;95(3):194-200. [Crossref] [PubMed]
- Park JK, Lee WS, Kim HY, Kim WC, Kim JH. Accuracy evaluation of metal copings fabricated by computer-aided milling and direct metal laser sintering systems. J Adv Prosthodont. 2015;7(2):122-8. [Crossref] [PubMed] [PMC]
- Son K, Lee S, Kang SH, Park J, Lee KB, Jeon M, et al. A comparison study of marginal and internal fit assessment methods for fixed dental prostheses. J Clin Med. 2019;8(6):785. [Crossref] [PubMed] [PMC]
- Ushiwata O, de Moraes JV. Method for marginal measurements of restorations: accessory device for toolmakers microscope. J Prosthet Dent. 2000;83(3):362-6. [Crossref] [PubMed]
- Coli P, Karlsson S. Fit of a new pressure-sintered zirconium dioxide coping. Int J Prosthodont. 2004;17(1):59-64. [PubMed]
- Attar N, Tam LE, McComb D. Mechanical and physical properties of contemporary dental luting agents. J Prosthet Dent. 2003;89(2):127-34. [Crossref] [PubMed]
- McLean JW, von Fraunhofer JA. The estimation of cement film thickness by an in vivo technique. Br Dent J. 1971;131(3):107-11. [Crossref] [PubMed]
- Nawafleh NA, Mack F, Evans J, Mackay J, Hatamleh MM. Accuracy and reliability of methods to measure marginal adaptation of crowns and FDPs: a literature review. J Prosthodont. 2013;22(5):419-28. [Crossref] [PubMed]
- Groten M, Axmann D, Pröbster L, Weber H. Determination of the minimum number of marginal gap measurements required for practical in-vitro testing. J Prosthet Dent. 2000;83(1):40-9. [Crossref] [PubMed]
- Pereira S, Roberts HW. Vertical marginal discrepancy performance of a CAD-CAM system with multiple users. Oper Dent. 2022;47(6):E273-E82. [Crossref] [PubMed]
.: İşlem Listesi