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

Year 2019, Volume: 29 Issue: 3, 455 - 460, 16.07.2019

Yurdanur Uçar Elif Figen Koçak Orhun Ekren

https://doi.org/10.17567/ataunidfd.471522

Abstract

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 SINTERING

Abstract

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  

Keywords

Hızlı Üretim, CAD/CAM, Lazer Sinterleme, Döküm

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