Değişen sinterleme sürelerinin dental zirkonyanın optik özellikleri üzerine etkisi

Amaç: Bu çalışmanın amacı farklı sinterleme sürelerinin zirkonyanın optik özellikleri üzerine etkilerinin araştırılmasıdır. Gereç ve Yöntem: Kısmi olarak sinterlenmiş translüsent Y-TZP bloklardan (10x10x1mm) hazırlanan 60 adet örnek aynı sıcaklıkta farklı sinterleme sürelerinin uygulandığı 3 farklı gruba (1. grup 1510 0C’de 180 dk, 2. grup 1510 0C’de 120 dk, 3. grup 1510 0C’de 30 dk) ayrıldı (n: 20). Sinterleme işlemi sonrasında profilometre kullanılarak yüzey pürüzlülük değerleri ölçüldü. Sonrasında örneklerin translüsensi değerleri ve kontrast oranları spektrofotometre, Easyshade, cihazı kullanarak tespit edildi. Bulgular: Zirkonya örneklere uygulanan farklı sinterleme sürelerinin yüzey pürüzlülük değerleri üzerinde herhangi bir istatistiksel farklılık oluşturmadığı tespit edilmiştir. Kontrast oranları ve translusensi değerlerindeki değişiklikler gruplar arasında istatistiksel olarak anlamlı olarak bulunmazken, bu iki parametre arasında negatif bir ilişkinin varlığı tespit edilmiştir. Sonuç: Sinterleme süresinin kısaltılması yapılan restorasyonlarda optik özellikler bakımından klinik olarak tespit edilebilecek herhangi bir olumsuzluğa neden olmamaktadır.

The effect of changing sintering time on the optical properties of dental zirconia

Aim: The purpose of this study is to investigate the effect of different dwelling time of sintering on optical properties of zirconia. Materials and Methods: Sixty specimens (10x10x1mm), prepared from the translucent partial sintered Y-TZP disc, were divided into three groups (n=20) according to the sintering dwelling time (1. group 1510 0C for 180 min, 2. group for 120 min and 3. group for 30 min). Surface roughness were measured by using profilometer after sintering procedure and then translucency parameters and contrast ratios were measured by spectrophotometer, Easyshade. Results: It has been found that the different sintering times applied to the zirconia samples do not make any statistically significant difference on the surface roughness. While no statistically significant difference was detected in contrast ratio and translucency, negative correlation was found between these two parameters. Conclusion: The shortening of the sintering time does not cause any clinically perceptible deterioration in optical properties in the restorations made.

PDF

___

Anusavice KJ. Recent developments in restorative dental ceramics. J Am Dent Assoc 1993; 124: 72-74.
Hannink RHJ, Kelly PM, Muddle B. Transformation toughening in zirconia-containing ceramics. J Am Ceram Soc 2000; 83: 461-487.
Fischer J, Stawarczyk B. Compatibility of machined Ce-TZP/Al2O3 nanocomposite and a veneering ceramic. Dent Mater 2007; 23: 1500-1505.
Aboushelib MN, Feilzer CJ, Feilzer AJ. Evaluation of a high fracture toughness composite ceramic for dental applications. J Prosthodont 2008; 17: 538-544.
Vult von Steyern PV, Carlson P, Nilner K. All-ceramic fixed partial dentures designed according to the DC Zircon technique: a 2-year clinical study. J Oral Rehabil 2005; 32: 180-187.
Raigrodski AJ et. al. The efficacy of posterior -unit zirconium-oxidebased ceramic fixed partial dental prostheses: a prospective clinical pilot study. J Prosthet Dent 2006; 96: 237-244.
Sailer I et. al. Five-year clinical results of zirconia frameworks for posterior fixed partial dentures. Int J Prosthodont 2007; 20: 383-388.
Edelhoff D, Florian B, Florian W, Johnen C. HIP zirconia fixed partial dentures – clinical results after 3 years of clinical service. Quintessence Int. 2008; 39: 459-471.
Schmitt J et. al. Zirconia posterior-fixed partial dentures: a prospective clinical-year follow-up. Int J Prosthodont. 2009; 22: 597-603.
Ilie N, Stawarczyk B. Quantification of the amount of blue light passing through monolithic zirconia with respect to thickness and polymerization conditions. J Prosthet Dent 2015; 113: 114-121.
Shah K, Holloway JA, Denry IL. Effect of coloring with various metal oxides on the microstructure, color, and flexural strength of 3Y-TZP. J Biomed Mater Res B Appl Biomater 2008; 87 :329-337.
Zhang Y. Making yttria-stabilized tetragonal zirconia translucent. Dent Mater 2014; 30: 1195-1203.
Lange FF. Transformation toughening: experimentalobservations in the ZrO2–Y2O3 system. J Mater Sci 1982; 17: 240-246.
Zhang Y, Griggs JA, Benham AW. Influence of powder/liquid mixing ratio on porosity and translucency of dental porcelains. J Prosthet Dent 2004; 91: 128-135.
Heffernan MJ et. al. Relative translucency of six all-ceramic systems. Part I: core materials. J Prosthet Dent 2002; 88: 4-9.
Kelly JR, Nishimura I, Campbell SD. Ceramics in dentistry: historical roots and current perspectives. J Prosthet Dent 1996; 75: 18-32.
Chen YM, Smales RJ, Yip KH, Sung WJ. Translucency and biaxial flexural strength of four ceramic core materials. Dent Mater 2008; 24: 1506-1511.
Tsukuma K, Kubota Y, Tsukidate T. Thermal and mechanical properties of Y2O3-stabilized tetragonal zirconia polycrystals. Science and technology of zirconia II. Advances in Ceramics 1984; 12: 382-390.
Anselmi-Tamburini U, Woolman JN, Munir ZA. Transparent nanometric cubic and tetragonal zirconia obtained by highpressure pulsed electric current sintering. Adv Funct Mater 2007; 17: 3267-3273.
Kim MJ, Ahn JS, Kim JH, Kim HY, Kim WC. Effects of the sintering conditions of dental zirconia ceramics on the grain size and translucency. J Adv Prosthodont. 2013; 5: 161-166.
Stawarczyk B, et. al. The effect of zirconia sintering temperature on flexural strength, grain size and contrast ratio. Clin Oral Invest 2013; 17: 269-274.
Hjerppe J, Narhi T, Froberg K, Vallittu PK, Lassila LV. Effect of shading the zirconia framework on biaxial strength and surface microhardness. Acta Ododntol Scand 2008; 66: 262-267.
Jiang L, Liao Y, Wan Q, Li W. Effects of sintering temperature and particle size on the translucency of zirconium dioxide dental ceramic. J Mater Sci Mater Med 2011; 22: 2429-2435.
Piconi C, Maccauro G. Zirconia as a ceramic biomaterial. J Biomater 1999; 20: 1-25.
Matsui K, Yoshida H, Ikuhara Y. Isothermal sintering effect on phase separation and grain growth in yttria-stabilized tetragonal zirconia polycrystal. J Am Ceram Soc 2009; 92: 467-475.
Vichi A, Sedda M, Fabian FR, Carrabba M, Comparison of Contrast Ratio, Translucency Parameter, and Flexural Strength of Traditional and "Augmented Translucency" Zirconia for CEREC CAD/CAM System. J Esthet Restor Dent 2016; 28: 32-39.
Falcone ME, Kelly JR, Rungruanganut P. In Vivo Color Relationships Between the Maxillary Central Incisors and Canines as a Function of Age. Int J Prosthodont 2016; 29: 496-502.
Ersoy NM, Aydoğdu HM, Değirmenci BÜ, Çökük N, Sevimay M. The effects of sintering temperature and duration on the flexural strength and grain size of zirconia. Acta Biomater Odontol Scand 2015; 1: 43-50.
Çelenk MF, Hızlı Ve Klasik Sinterleme Uygulanan Zirkonyanın Farklı Yüzey İşlemleri Sonrası Seramik Bağlantısının Ve Mekanik Özelliklerinin Değerlendirilmesi, Diş Hekimliğinde Uzmanlık Tezi, 2016.
Min-Chieh Liu, Steven Aaquilino, Peter S Lung, . Human Perception of Dental Porcelain Translucency Correlated to Spectrophotometric Measurements. J Prosthodont 2010; 19: 187-193.
Barizon KT, Bergeron C, Vargas MA, . Ceramic materials for porcelain veneers. Part I: correlation between translucency parameters and contrast ratio. J Prosthet Dent 2013; 110: 397-401.
Mi-Jin K, Jin-Soo A, Ji-Hwan K, Hae-Young K, Woong-Chul K. Effects of the sintering conditions of dental zirconia ceramics on the grain size and translucency. J Adv Prosthodont 2013; 5: 161-166.
Kamal Ebeida, et. al. Effect of changes in sintering parameters onmonolithic translucent zirconia. Dental materials 2014; 30: 419-424.
Hee-Kyung K, Sung-Hun K, Jai-Bong L, Seung-Ryong H. Effects of surface treatments on the translucency, opalescence, and surface texture of dental monolithic zirconia ceramics. J Prosthet Dent 2016; 115: 773-779.