Turkiye Klinikleri Journal of Dental Sciences

.: ORIGINAL RESEARCH
Evaluation of Marginal and Internal Fit of Metal-Ceramic Restorations Produced by Direct Metal Laser SinteringMethod Before and After Porcelain Application: Experimental Study (In Vitro Material Study)
Direkt Metal Lazer Sinter Yöntemiyle Üretilen Metal Seramik Restorasyonların Porselen Uygulaması Öncesi ve Sonrası Marjinal ve İnternal Uyumlarının Değerlendirilmesi: Deneysel Çalışma (İn Vitro Materyal Çalışması)
Mehmet BİÇERa , Server MUTLUAY ÜNALb
aPrivate Dentis, Eskişehir, Türkiye
bDepartment of Prosthetic Dentistry, Afyonkarahisar University of Health Sciences Faculty of Dentistry, Afyonkarahisar, Türkiye
Turkiye Klinikleri J Dental Sci. 2023;29(4):581-8
doi: 10.5336/dentalsci.2023-97244
Article Language: EN
Full Text
ABSTRACT
 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
ÖZET
 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
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