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

Year 2006, Volume: 33 Issue: 1 - Volume: 33 Issue: 1, 107 - 118, 01.05.2006

Evrim Doğan Ali Zaimoğlu

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.

References

• Preston JD. Color in Dental Ceramics. Chapter 1. In: Esthetic Guidelines for Restorative Dentistry. Scharer, P., Rinn, L.A., Kopp, F.R., Quintessence Pub.Co.Inc. Chicago, Berlin, Rio de Janerio, Tokyo. 1982.
• Rosenblum MA, Schulman A. A review of all-ceramic restorations. J Am Dent Assoc 1997; 128: 297-307.
• Hekimoğlu C, Anıl N, Etikan İ. Effect of accelerated aging on the color stability of cemented laminate veneers. Int J Prosthodont 2000; 13: 29-33.
• Mc Lean JW. The science and art of dental ceramics. Aesthetics of Dental Porcelain. Quintessence Pub. Co. Inc. Chicago,USA 1979.
• Ulusoy M, Toksavul S. Kron-köprü çalışmalarında diş renginin önemi ve renkle ilgili temel kavramlar. Ege Diş Hekimliği Fakültesi Dergisi. 1992; 13: 29-36.
• Seghi RR, Johnston WM, Q’Brien WJ. Spectrophotometric analysis of color differences between porcelain systems. J Prosthet Dent 1986; 56: 35-40.
• Finesse. Low Fusing Porcelain System. Introduction, Ceramco Inc., USA. 1996.
• Minolta. Minolta chroma meters. Minolta Co. Ltd. Osaka 541-56 Japan. 1994.
• -Yazgan YK. Porselen kron sistemlerinin estetik ve mekanik özelliklerinin değerlendirilmesi. Doktora Tezi, Ankara Üniversitesi Sağlık Bilimleri Enstitüsü. 2003.
• Leinfelder KF. Porcelain esthetics for the 21st century. J Am Dent Assoc 2000; 131: 47-52.
• Kansu G. Temel metal alaşımları ile düşük ısı porselenlerinin bağlantı dayanıklılığı. A.Ü. Diş Hek. Fak. Derg. 2001; 28: 185-91.
• Zaimoğlu A, Can G. Sabit Protezler. Ankara: Ankara Üniversitesi Basımevi. 2004; s.: 111-45
• Heffernan MJ, Aquilino SA, Diaz-Arnold AM, Haselton DR, Stanford CM, Vargas MA. Relative translucency of six all-ceramic systems. Part I: Core materials. J. Prosthet. Dent.; 2002; 88: 4-9.
• Heffernan MJ, Aquilino SA, Diaz-Arnold AM, Haselton DR, Stanford CM, Vargas MA. Relative translucency of six all-ceramic systems. Part II: Core and veneer materials. J Prosthet Dent 2002; 88: 10-5.
• Douglas RD, Przyblska M. Predicting porcelain thickness required for dental shade matc- hes. J Prosthet Dent 1999; 82: 143-9.
• Seghi RR. Effects of instrument-measuring geometry on colorimetric assessments of dental porcelains. J Dent Res 1990; 69: 1180-3.
• Razzoog ME, Lang BR, Russell MM, May KB. A comparison of the color stability of conven- tional and titanium dental porcelain. J Prosthet Dent 1994; 72: 453-6.
• Douglas RD. Color stability of new-gene- ration indirect rezins for prosthodontic application. J Prosthet Dent 2000; 83: 166-70.
• Heydecke G, Zhang F, Razzoog ME. In vitro color stability of double-layer veneers after accelerated aging. J Prosthet Dent 2001; 85: 551-7.
• Ruyter IE, Nilner K, Moller B. Color sta- bility of dental composite resin materials for crown and bridge veneers. Dent Mater 1987; 3: 246-51.
• O’Brien WJ. Dental materials and their selection. Chapter 3: Color and appearance. Quintessence Publishing Co. Inc., 2 nd Ed. 1997.
• Jacobs SH, Goodacre CR, Moore BK, Dykema RW. Effect of porcelain thickness and type of metal ceramic alloy on color. J Prosthet Dent 1987; 57: 138-45.