ZİRKONYA RESTORASYONLARDA RENKLENDİRME

Öz

Günümüzde protetik tedavilerde tam seramik restorasyonların kullanımı oldukça yaygınlaşmıştır. Zirkonya yüksek mekanik dayanımı nedeniyle sıklıkla kullanılan bir tam seramik materyalidir. Opaklığı sebebiyle başlangıçta altyapı maddesi olarak kullanılmış ve cam seramikler ile veneerlenmiş ancak sıklıkla venner başarısızlıkları görülmüştür. Bu nedenle translusensi özelliği arttırılarak monolitik olarak kullanımı gündeme gelmiştir. Cam seramiklere göre yüksek opasiteye sahip olan zirkonyanın özellikle monolitik kullanımında ortaya çıkan estetik dezavantajlarını azaltmak ve doğal dişe yakın bir görünüm elde etmek için renklendirme işlemleri titizlikle yapılmalıdır. Bilgisayar destekli tasarım ve üretim teknikleriyle restorasyonların üretiminde kullanılan zirkonya bloklar, çoğunlukla yarı sinterize halde bulunmaktadır. Bu yöntemle renksiz ve kendinden renkli bloklardan restorasyonlar üretilebilirken; renksiz bloklardan üretilen restorasyonlar, sinterleme işlemi öncesinde solüsyonlar yardımıyla veya sinterleme işlemi sonrasında dış boyama ile renklendirilebilmektedir. Ancak uygulanan bu renklendirme işlemleri zirkonyanın özelliklerini etkileyebilmektedir. Literatürde zirkonyanın renklendirme yöntemleri ve renklendirmenin zirkonya üzerindeki etkileriyle ilgili birçok çalışma mevcuttur. Bu derleme makalesinde zirkonyanın renklendirme prosedürleri anlatılmış ve bu işlemlerin zirkonya üzerine olan etkilerinin değerlendirilmesi amaçlanmıştır. Anahtar Kelimeler: Zirkonyum, renklendirme, dental porselen, yttria stabilize dörtgen zirkon COLORING IN ZIRCONIA RESTORATIONS ABSTRACT Nowadays, the use of all ceramic restorations in prosthetic treatments has gained popularity. Due to its high mechanical strength, zirconia is frequently used in all ceramic dental restorations. Zirconia was initially used as a core material in dental restorations which was veneered with a glass ceramic because of its opacity. However, the high frequency of veneer failures led the use of monolithic zirconia with increased tranlucency. To reduce the esthetic disadvantages of zirconia associated with its high opacity and to obtain a natural appearance, various coloring procedures especially for monolithic zirconia should be applied meticulously. In general, semi-sintered zirconia blocks are used in the production of dental restorations with computer aided design and manufacturing techniques. These blocks can be in the form of white color or industrially precolored. Restorations milled from white color blocks are colored with solutions prior to sintering or are stained after sintering. However, these coloring procedures could have some effects on the material properties as shown in the literature on coloring methods and their effects on zirconia. The aim of this review article is to reveal the coloring procedures of zirconia and to evaluate the effects of coloring processes on the material properties. Keywords: Zirconium, coloring, dental porcelain, yttria stabilized tetragonal zirconia

Anahtar Kelimeler

• Zirkonyum
• renklendirme
• dental porselen
• yttria stabilize dörtgen zirkon

Kaynakça

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