DİŞ HEKİMLİĞİNDE YENİ GELİŞTİRİLEN YÜKSEK TRANSLÜSENT MONOLİTİK PARSİYEL STABİLİZE ZİRKONYA SİSTEMLERİNİN OPTİK VE MEKANİK ÖZELLİKLERİNİN DEĞERLENDİRİLMESİ: DERLEME

Year 2021, Volume: 31 Issue: 4, 669 - 675, 14.10.2021

Gülsüm Doğru Elif Demiralp Handan Yılmaz

https://doi.org/10.17567/ataunidfd.831822

Abstract

İtriya tetragonal zirkonya polikristalin restorasyonları yüksek kırılma dayanıklılığı, tokluk, aşınmaya karşı direnç gibi mükemmel mekanik özelliklere sahiptir. Ancak itriya tetragonal zirkonya polikristalin restorasyonların en büyük dezavantajı opak olması nedeniyle estetik özelliklerinin daha zayıf olmasıdır. İtriya tetragonal zirkonya polikristalin restorasyonların opaklığının giderilmesi ve translüsensliğinin arttırılması için değişik yöntemler geliştirilmiştir. İtriya tetragonal zirkonya polikristalin restorasyonların translüsensliğini geliştirmek amacıyla itriya içeriği arttırılmış ve ışık geçirgenliğini artıran kübik faz zirkonya kullanılarak yüksek translüsent parsiyel stabilize zirkonyalar üretilmiştir. Kübik fazın artmasıyla tetragonal fazdan (t) monoklinik faza dönüşümün (m) azaltılması mekanik özelliklerin zayıflamasına sebep olabilmektedir. İtriya tetragonal zirkonya polikristalin restorasyonların translüsensliği alüminyum oksit miktarının azaltılması, itriyum oksit miktarının arttırılması ile sağlanmaktadır. Bu durum zirkonyanın stres ile oluşan transformasyon sertliğini azaltarak, bükülme dayanımı ve kırılma direnci gibi mekanik özelliklerini olumsuz yönde etkilemektedir. Yeni geliştirilen yüksek translüsent monolitik parsiyel stabilize zirkonya restorasyonları, artan estetik özellikleri nedeniyle itriya tetragonal zirkonya polikristalin restorasyonlarına alternatif olarak kullanılabilmektedir. Bu derlemenin amacı, yeni geliştirilen translüsent parsiyel stabilize zirkonya seramiklerinin optik ve mekanik özelliklerinin incelenerek değerlendirilmesidir.
Anahtar kelimeler: monolitik zirkonya, translüsent zirkonya, parsiyel stabilize zirkonya, optik özellikler, mekanik özellikler.

Keywords

monolitik zirkonya, translüsent zirkonya, parsiyel stabilize zirkonya, optik özellikler, mekanik özellikler.

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