THE EVALUATION OF BOND STRENGTH BETWEEN DENTAL CERAMIC AND BASE METAL ALLOYS FABRICATED BY CASTING AND LASER SINTERING

Amaç: Bu çalışmanın amacı lazer sinterize Co-Cr ve döküm yöntemi ile elde edilen Ni-Cr ve Co-Cr alaşımlarının porselen ile bağlantısını 3-nokta-bükme testi (3-Point-Bending; 3PB) kullanarak değerlendirmektir. Gereç-Yöntem: Çalışmada metal altyapı olarak 3 farklı grup kullanılmıştır: lazer sinterize Co-Cr, döküm Co-Cr ve döküm Ni-Cr. Her grup için 15 örnek ISO 9693(1999) standartlarına uygun olarak hazırlanmış ve 3PB testi kullanılarak bağlanma dayanımı değerlendirilmiştir. Veriler ANOVA ve  sonrasında Tukey çok yönlü karşılaştırma testi kullanılarak değerlendirilmiştir (α=0,05). Bulgular: Bükülme modülü ve ortalama en yüksek bükme dayanımı değerleri karşılaştırıldığında her iki parametre için 3 grup arasında istatistiksel fark bulunmuştur (P=0,0001). En düşük ortalama bükülme modülü lazer sinterize grupta gözlenirken (77±6,5 GPa), en yüksek değer döküm Co-Cr grubunda (247±16 GPa) görülmüştür. İkili karşılaştırmalarda her 3 grup da birbirinden farklı bulunmuştur. Ortalama bükülme dayanımı değerleri karşılaştırıldığında ise en yüksek dayanım değeri lazer sinterize Co-Cr (87±9 MPa) grubunda bulunurken, döküm Co-Cr grubunun bükülme dayanımı (78±13 MPa) daha düşük olmakla birlikte aradaki farkın istatistiksel açıdan anlamlı olmadığı görülmüştür (P=0,094). Ancak döküm Ni-Cr grubunun ortalama bükülme dayanımı değeri (45±11 MPa) Co-Cr gruplarından anlamlı şekilde daha düşük bulunmuştur (P=0,0001). Sonuç: Bu çalışmanın sınırları dâhilinde lazer sinterize Co-Cr altyapılarının porselen ile güçlü bir bağlantı oluşturduğu sonucuna varılmıştır. Anahtar kelimeler: Hızlı Üretim, CAD/CAM, Lazer Sinterleme, Döküm, Bağlanma Dayanımı THE EVALUATION OF BOND STRENGTH BETWEEN DENTAL CERAMIC AND BASE METAL ALLOYS FABRICATED BY CASTING AND LASER SINTERINGAbstract Aim: The aim of this study was to evaluate bond strength of laser sintered Co-Cr and cast Co-Cr and Ni-Cr alloys to porcelain using 3-point-bending test (3PB test). Material and Methods: 3 different metal frameworks were used in the current study: laser sintered Co-Cr, cast Co-Cr and cast Ni-Cr. Fifteen specimens per group were prepared according to ISO 9693 standard (1999) and tested using 3PB test. Results were analyzed using one-way ANOVA followed by Tukey multiple comparison test (α=0,05). Results: Mean bending modulus and flexural bending strength were statistically significantly different among 3 groups (P=0,0001). The lowest mean bending modulus was observed for laser sintered Co-Cr group (77±6,5 GPa) and the highest value was observed for cast Co-Cr group (247±16 GPa). Pairwise comparisons have shown statistically significant differences between all compared groups. When mean bending strength values were compared, the highest value was observed for laser sintered Co-Cr group (87±9 MPa). Although mean flexural strength value of cast Co-Cr group (78±13 MPa) was lower than the laser sintered one, the difference was not statistically significant (P=0,094). However, the mean bending strength of cast Ni-Cr (45±11 MPa) was significantly lower than the Co-Cr groups (P=0,0001). Conclusion: Within the limitations of this study, it can be concluded that laser sintered Co-Cr frameworks establish a strong bond with porcelain.   Key Words: Rapid manufacturing, CAD/CAM, Laser Sintering, Casting, Bond Strength  

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  • 1. Naylor PW. Introductıon to metal-ceramic technology, 3 rd ed. Berlin; Quintessence publishing Co Inc; 2017. p. 109.
  • 2. White SN, Ho L, Caputo AA, Goo E. Strength of porcelain fused to titanium beams. J Prosthet Dent. 1996;75:640-8.
  • 3. O’Brien WJ. Dental Materials and Their Selection. 4th ed. Chicago; Quintessence Publishing Co Inc; 2008; p. 531.
  • 4. Anusavice KJ, Shen C, Rawls RH. Phillips’ science of dental materials. 12th ed. St Louis; Elsevier Inc. Saunders; 2013. p. 418-73.
  • 5. Ucar Y, Aksahin Z, Kurtoglu C. Metal ceramic bond after multiple castings of base metal alloy. J Prosthet Dent. 2009;102:165-71.
  • 6. Naylor PW. Introductıon to metal-ceramic technology, 3 rd ed. Berlin; Quintessence publishing Co Inc; 2017. p. 18.
  • 7. Ekren O, Ozkomur A, Ucar Y. Effect of layered manufacturing techniques, alloy powders, and layer thickness on metal-ceramic bond strength. J Prosthet Dent. 2018;119:481-7.
  • 8. Uçar Y, Aysan Meriç I, Ekren O, Layered Manufacturing of Dental Ceramics: Fracture Mechanics, Microstructure, and Elemental Composition of Lithography-Sintered Ceramic. J Prosthodont. 2018 Feb 11. doi: 10.1111/jopr.12748
  • 9. Koutsoukis T, Zinelis S, Eliades G, Al-Wazzan K, Rifaiy MA, Al Jabbari YS. Selective Laser Melting Technique of Co-Cr Dental Alloys: A Review of Structure and Properties and Comparative Analysis with Other Available Techniques. J Prosthodont. 2015;24:303-12.
  • 10. Yıldırım MP, Bayındır F. Protetik diş tedavisinde hızlı prototip üretim teknolojileri Atatürk Üniv. Diş Hek. Fak. Derg 2013;25:430-35
  • 11. Mazzoli A. Selective laser sintering in biomedical engineering. Med Biol Eng Comput. 2013;51:245-56.
  • 12. Ren XW, Zeng L, Wei ZM, Xin XZ, Wei B. Effects of multiple firings on metal-ceramic bond strength of Co-Cr alloy fabricated by selective laser melting. J Prosthet Dent. 2016;115:109-14.
  • 13. Nesse H, Ulstein DM, Vaage MM, Øilo M. Internal and marginal fit of cobalt-chromium fixed dental prostheses fabricated with 3 different techniques. J Prosthet Dent. 2015;114:686-92.
  • 14. Naylor PW. Introductıon to metal-ceramic technology, 3 rd ed. Berlin; Quintessence publishing Co Inc; 2017. P. 53.
  • 15. Bae EJ, Kim JH, Kim WC, Kim HY. Bond and fracture strength of metal-ceramic restorations formed by selective laser sintering. J Adv Prosthodont. 2014;6:266-71.
  • 16. Li J, Chen C, Liao J, Liu L, Ye X, Lin S, Ye J. Bond strengths of porcelain to cobalt-chromium alloys made by casting, milling, and selective laser melting. J Prosthet Dent 2017;118:69-75.
  • 17. Dimitriadis K, Spyropoulos K, Papadopoulos T. Metal-ceramic bond strength between a feldspathic porcelain and a Co-Cr alloy fabricated with Direct Metal Laser Sintering technique. J Adv Prosthodont 2018;10:25-31.
  • 18. Kaleli N,Sarac D. Comparison of porcelain bond strength of different metal frameworks prepared by using conventional and recently introduced fabrication methods. J Prosthet Dent 2017;118:76-82.
  • 19. Akova T, Ucar Y, Tukay A, Balkaya MC, Brantley WA. Comparison of the bond strength of laser-sintered and cast base metal dental alloys to porcelain. Dent Mater 2008;24:1400-4.
  • 20. HammadIA,TalıcYF. Designs of bond strength tests for metalceramic complexes: review of the literature. J Prosthet Dent. 1996;75:602-8.