Comparison of the Colour Stability of Low Fusing Porcelain with Different Thickness Baked on Base Metal Alloy and Metal Free Cores after Aging Process

Abstract

The purpose of this study was to compare thecolour stability of metal ceramic and all ceramicsystems after accelerated aging process. Two different porcelain restorations were evaluated in thisinvestigation. Group I: Base metal core + Finesselow fusing porcelain, Group II: All-ceramic +Finesse low fusing porcelain. Porcelain cores of thesamples were made of Finesse all ceramic coreporcelain materials while metal cores were castfrom Wiron 99 base metal alloy. The samples wereproduced with three different dentin porcelainthicknesses, such as 0,6 mm, 0,9 mm and 1,2 mm.A jig with an 8 mm diameter was used to constructthe samples with different thicknesses of dentinporcelain on the cores. Ten samples were preparedfor each group and in total 60 samples were investigated. All samples were produced in A2 shade.Colorimetric analysis of the samples was performedusing a Minolta CR 321 colorimeter. The shades ofthe samples were recorded after the glazing processof porcelains and were subjected to the acceleratedaging process after glazings. Colorimetric measurements were repeated for each sample after 300hours of aging. Colorimetric data were recorded asCIE L a b values and the colour difference valueswere calculated using the following formula: ∆E ={ ∆L* 2+ ∆a* 2+ ∆b* 2}1/2. The results of statistical analysis indicated that depending on the porcelain type and thickness, each of the three colourparameters L: darkness-lightness, a: red-green, b:yellow-blue demonstrated significant differences in the porcelain groups **p

Keywords

• Low fusing porcelain, acceleratedaging simulation, color

TEMEL METAL VE KOR ALT YAPI ÜZERİNE FARKLI KALINLIKLARDA HAZIRLANAN DÜŞÜK ISI PORSELENİNİN RENK STABİLİTESİNİN ESKİTME SONRASI KARŞILAŞTIRILMASI

Abstract

Bu çalışmanın amacı metal porselen ve fullporselen sistemlerin hızlandırılmış eskitme işlemisonrasında renk stabilitesini karşılaştırmaktır.Çalışmada 2 farklı porselen restorasyon incelenmiştir. Grup I: Temel metal kor+ Finesse düşük ısıporseleni, Grup II: Seramik kor+ Finesse düşük ısıporseleni, Örneklerdeki tam seramik kor finesseall ceramic kor materyalinden, metal kor Wiron99 temel metal alaşımından elde edildi. Örnekler0,6mm, 0,9mm, 1,2mm dentin kalınlıklarındahazırlandı. Korların üzerine farklı kalınlıklardadentin porseleni hazırlamak için 8mm çapında birkalıp kullanıldı. Her grup için 10 örnek hazırlandıve toplam 60 örnek incelendi. Bütün örnekler A2renginde hazırlandı. Örneklerin renk analiziMinolta CR 321 kolorimetre kullanılarak gerçekleştirildi. Örneklerin renkleri porselenlerin glazeişleminden sonra kaydedildi. Glazeden sonra örnekler h›zland›r›lm›ş eskitme siklusuna tabi tutuldu. 300 saatlik eskitmeden sonra renk ölçümleri tekrarland›. CIE Lab renk sistemine göre veriler al›nd› ve renk değişiminin hesaplanmas›nda ∆E= [ ∆L* 2+ ∆a* 2+ ∆b* 2]1/2 formülü kullan›ld›. İstatistiksel analiz sonucuna göre porselen tipi ve kal›nl›klara bağl› olarak her üç renk parametresinin L aç›kl›k- koyuluk, a k›rm›z›- yeşil, b sar›- mavi porselen gruplar›nda önemli farkl›l›klar gösterdiği bulundu **p

Keywords

• Düşük ›s› porselen, eskitme, renk.

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