Zirkonya Kronlarda Farklı Sinter Prosedürleri ve Veneer Pişirmeleri ile Birlikte Görülen Boyutsal ve Marjinal Aralık Değişimleri

Yıl 2021, Cilt: 8 Sayı: 2, 522 - 529, 31.08.2021

Hasan Murat Aydoğdu Murat Eskitaşçıoğlu

https://doi.org/10.15311/selcukdentj.837186

Öz

Amaç: Dental restorasyonların marjinal uyumu, uzun vadeli başarı için hayati bir faktördür. Yüksek sıcaklıklarda birden fazla sayıda fırınlamayı içeren zirkonyum veneerleme işleminin, zirkonya altyapıların marjinal uyumunu etkilediği gösterilmiştir. Bu çalışmanın amacı, farklı prosedürlerle sinterlenmiş zirkonya iskeletlerin veneerleme pişirimleri sırasındaki boyutsal ve marjinal boşluk değişimlerini gözlemlemektir.
Gereç ve Yöntemler: 30 Y-TZP ((inCoris ZI, Sirona, Bensheim, Almanya) kuron altyapısı 8 saat, 2 saat ve 10 dakikalık üç farklı süre ile sinterlendi. Ölçüm mikroskobu ile referans noktalarına dayalı oklüzal ve bukkal boyutsal ölçümler yapıldı. Pişirme işleminin etkisini gözlemlemek için porselen malzemesi uygulanmadan veneer pişirmeleri yapıldı. Tüm boyutsal ve marjinal boşluk ölçümleri tekrarlandı ve veneer fırınlamasından önce ve sonra alınan veriler tek yönlü ANOVA ve eşleştirilmiş t testi ile analiz edildi.
Bulgular: Üç grubun sinterleme büzülmesi arasında önemli bir farklılık gözlenmedi. Marjinal boşluklar tüm gruplarda veneer pişirmelerinden sonra azaldı ve azalma 2 saat ve 10 dakikalık sinterleme gruplarında anlamlıydı (p <.05). Oklüzal yüzey boyutsal değişiklikleri büzülmeyi gösterecek şekilde negatifti; bukkal yüzeylerde ise genişlemeyi gösterecek şekilde pozitifti,. Yüzeylerdeki boyutsal değişim açısından üç grup arasında istetistiksel olarak anlamlı bir farklılık tespit edilmedi.
Sonuç: Her üç sinterleme grubu için de veneer pişirimi zirkonyum yapılarda okluzal yüzeylerde küçülme ve bukkal yüzeylerde genişleme şeklinde distorsiyona neden olurken, tüm gruplarda pişirme sonrası marjinal boşluk değerleri azalmıştır.

Anahtar Kelimeler

dental araştırma, dental porselen, prostodonti, seramikler

Destekleyen Kurum

Yüzüncü Yıl Üniversitesi Bilimsel Araştırma Projeleri Başkanlığı

Proje Numarası

2014-SBE-D018

Teşekkür

İstatistiksel analiz için Dr. Öğretim Üyesi Barış Kaki, maddi destek için Yüzüncü Yıl Üniversitesi Bilimsel Araştırma Projeleri Başkanlığı

A Study on Dimensional and Marginal Gap Changes Through Application of Different Sintering Methods and Veneer Firings on Zirconia Crowns

Öz

Background: The marginal fit of dental restorations is a vital factor for long-term success. The veneering process of zirconia, which involves multiple firings at high temperatures, has shown to affect the marginal fit of zirconia cores. The aim of this study is to observe dimensional and marginal gap changes during veneer firing of zirconia frameworks sintered with different procedures.
Methods: 30 Y-TZP ((inCoris ZI, Sirona, Bensheim, Germany) crown frameworks sintered with three different durations of 8 hours, 2 hours and 10 minutes. Occlusal and buccal dimensional measurements based on reference points measured with toolmaker’s microscope. Frameworks subjected to veneer firings without application of veneering material to observe the effect of firing process only. All dimensional and marginal gap measurements were repeated and after veneer firings. Data were analysed with one-way ANOVA and paired t test.
Results: No significant differences observed between the sintering shrinkage of three groups. Marginal gaps decreased after veneer firings for all groups and the decrease was significant for 2 hour and 10-minute sintering groups (p <.05). The occlusal surface dimensional changes were negative which indicates shrinkage; again, buccal surface was positive which indicates enlargement. No significant differences between the three groups regarding surface dimensions were detected.
Conclusions: For all three sintering groups, veneer firing caused distortion on zirconia structures in the form of shrinkage in occlusal surfaces and enlargement in buccal surfaces, whereas marginal gap values decreased after firing in all groups.

Anahtar Kelimeler

ceramics, dental porcelain, dental research, prosthodontics

Proje Numarası

2014-SBE-D018

Kaynakça

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