2010

DEĞİŞİK YÖNTEMLERLE HAZIRLANAN METAL ALT YAPILAR ÜZERİNDEKİ VENEER PORSELENLERİNİN KIRILMA DİRENCİNE FARKLI KENAR BİTİM ŞEKİLLERİNİN ETKİSİNİN İNCELENMESİ≠

Amaç: Bu çalışmada, değişik yöntemlerle hazırlanan metal alt yapılar üzerindeki veneer porselenlerinin kırılma direncine farklı kenar bitim şekillerinin etkisi in vitro olarak incelenmiştir.Materyal ve Metod: Örneklerin elde edileceği kesilmiş üst 1. küçük azı dişini temsil eden güdükler; 1. Güdük; 6 mm kuron boyu ve 6° taper açısında 1 mm shoulder basamak, 2. Güdük; 6 mm kuron boyu ve 6° taper açısında 1 mm chamfer basamak ile standardizasyonun sağlanması amacıyla CNC torna tezgahında hazırlanmıştır. Güdüklerden alınan ölçülerden 30 adet epoksi rezin güdük elde edilmiştir. Metal alt yapılar farklı yöntemlerle hazırlandıktan sonra üst yapı porseleni uygulanarak kuronlar tamamlanmıştır. Kuronlar epoksi rezin güdükler üzerine simante edildikten sonra veneer porselenlerinin kırılma dirençleri Universal test cihazında ölçülmüştür. Veriler iki yönlü varyans analizi (ANOVA) ile değerlendirilmiş, çoklu karşılaştırma ve t-testi uygulanmıştır.Bulgular: Varyans analizi sonucunda; kırılma direnci değerlerine basamak şekli ve hazırlama yöntemlerinin etkisinin anlamlı olduğu istatistiksel olarak tespit edilmiştir (p<0.05).Sonuç: En yüksek veneer porselen kırılma direnci değerlerinin döküm yöntemiyle hazırlanan chamfer bitim hatlı kuronlarda olduğu görülmüştür. Anahtar Kelimeler: Metal alt yapılar, kenar bitim şekli, kırılma direnci AN ANALYSIS OVER THE EFFECT OF MARGINAL DESIGN ON THE FRACTURE RESISTANCE OF VENEER PORCELAINS APPLIED ON METAL FRAMEWORKS PREPARED THROUGH VARIOUS METHODSABSTRACT AimIn this study, the effect of marginal design on the fracture resistance of veneer porcelains.Material and Method: To provide standardization, the dies representing the upper first premolar tooth, through which samples would be obtained, were prepared in the CNC turning machine as: the first die; with a 6 mm crown length and at 6º taper angle, having a 1 mm sholder marginal desing, the second die; with a 6 mm crown length and at 6 º taper angle, having a 1 mm chamfer marginal desing. 30 pieces of epoxy resin dies were obtained from the measurements taken from the dies. After the metal frameworks had been prepared through different methods, the crowns were completed by applying the body porcelain. After cementation the crowns on the epoxy resin dies, the fracture resistance of veneer porcelains was measured by the Universal test device. The data were evaluated through the two-way variance analysis (ANOVA).Results: It was statistically determined that the different metal framework methods and marginal design was significant effected fracture resistance of veneer porcelains (p<0.05).Conclusion: The framework of the highest fracture resistance values of veneer porcelain was seen in cast crowns prepared chamfer marginal design. Key Words: Metal frameworks, marginal design, fracture resistance

Anahtar Kelimeler:

Metal alt yapılar, kenar bitim şekli

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Morena R, Beaudreau GM, Lockwood PE, Evans AL, Fairhust CW. Fatigue of dental ceramics in a simulated oral environment. J Dent Res 1986; 65: 993-7.
2. Craig GR, Powers MJ. Restorative Dental Materials. 11th edition, St. Louis: CV Mosby, 2002: p. 480, 552, 553, 556, 565-566, 576-585.
3. Persson M, Bergman M. Metal-ceramic bond strength. Acta Odontol Scand 1996; 54: 160-5.
4. Zaimoğlu A, Burgaz Y, Yurdukoru B. Metal-seramik bağlantısında oksidasyonun önemi. A Ü Diş Hek Fak Derg 1984; 11: 237-45.
5. Zarone F, Russo S, Sorrentino R. From porcelain fused to metal to zirconia: Clinical and experimental considerations. Dent Mater 2011;27: 83-96.
6. Ortorp A, Jönsson D, Mouhsen A, Von Steyren PV. The fit of cobalt-chromium three unit fixed dental prostheses fabricated with four different techniques: A comparative in vitro study. Dent Mater 2011;27: 356-63.
7. Raigrodski AJ, Chiche GJ, Potiket N, Hochstedler JL, Mohamed SE, Billiot S, Mercante DE. The efficacy of posterior three-unit zirconium-oxide-based ceramic fixed partial dental prostheses: a prospective clinical pilot study. J Prosthet Dent 2006; 96: 237-44.
8. Bonfante EA, Coelho PG, Bayardo-Gonzalez DE, Thompson VP, Bonfante G. Effect of framework design on crown failure. Eur J Oral Sci 2009;194-9.
9. Shillingburg H, Hobo S, Whitsett L, Jacobi R, Brackett S Fundamentals of Fixed Prosthodontics. 3th ed. Chicago, Quintessence Publishing, 1997:p. 242-80.
10. Gavellis JR, Lim SB, Guckes AD, Morency JD, Sozio RB. A comparison of the bond strength of two ceramometal systems. J Prosthet Dent 1982; 48: 424-8.
Sailer I, Feher A, Filser F, Luthy H, Gauckler LJ, Scharer P, Franz Hammerle CH. Prospective clinical study of zirconia posterior fixed partial dentures: 3-year follow-up. Quintessence Int 2006;37:685-93.
22. Kelly JR. Dental ceramics: current thinking and trends. Dent Clin North Am 2004;48:513-30.
23. Caputi S, Varvara G. Dimensional accuracy of resultant casts made by a monophase, one-step and two-step, and a novel two-step putty/light-body impression technique: an in vitro study. J Prosthet Dent 2008;99:274-81.
24. Nissan J, Laufer BZ, Brosh T, Assif D. Accuracy of three polyvinyl siloxane puttywash impression techniques. J Prosthet Dent 2000;83:161-5.
25. Lawn BR, Pajares A, Zhang Y, Deng Y, Polack MA, Lloyd IK, Rekow ED, Thompson VP. Materials design in the performance of all-ceramic crowns. Biomater 2004;25:2885-92.
26. Sundh A, Sjogren G. A comparison of fracture strength of yttrium-oxide- partiallystabilized zirconia ceramic crowns with varying core thickness, shapes and veneer ceramics. J Oral Rehabil 2004;31:682-8.
27. Ambre MJ, Aschan F, Vult von Steyern P. Fracture strength of yttria-stabilized zirconium-dioxide (Y-TZP) fixed dental prostheses (FDPs) with different abutment core thicknesses and connector dimensions. J Prosthodont 2013; 22:377-82.
28. Tinschert J, Natt G, Mautsch W, Augthun M, Spiekermann H. Fracture resistance of lithium disilicate-, alumina-, and zirconia-based three-unit fixed partial dentures: a laboratory study. Int J Prosthodont 2001;14:231-8.
29. Filser F, Luthy H, Kocher P, Scharer P, LJ. G. Posterior all-ceramic bridgework. Quintessence of Dental Technology 2003;1:28-41.
30. Cho L, Choi J, Yi YJ, Park CJ. Effect of finish line variants on marginal accuracy and fracture strength of ceramic optimized polymer/fiber-reinforced composite crowns. J Prosthet Dent 2004;91:554-60
Malament KA, Socransky SS. Survival of Dicor glass-ceramic dental restorations over 14 years. Part II: effect of thickness of Dicor material and design of tooth preparation. J Prosthet Dent 1999;81:662-7.
42. Goodacre CJ, Campagni WV, Aquilino SA. Tooth preparations for complete crowns: an art form based on scientific principles. J Prosthet Dent 2001;85: 363-76.
43. Güngör MA, Dündar M, Karaoğlu Ç, Sonugelen M, Artunç C. Tam seramik malzemelerde basamak şeklinin gerilim dağılımına etkisi: Sonlu elemanlar stres analizi. Ege Üniv Diş Hek Fak Derg 2005;26: 145-53.
44. Zaimoğlu A, Can G. Sabit Protezler. 1th ed. Ankara, Ankara Üniversitesi Baskı, 2004:90-105.
45. Ernst CP, Cohnen U, Stender E, Willershausen B. In vitro retentive strength of zirconium oxide ceramic crowns using different luting agents. J Prosthet Dent 2005;93: 551-8.
46. Komine F, Tomic M, Gerds T, Strub JR. Influence of different adhesive resin cements on the fracture strength of aluminum oxide ceramic posterior crowns. J Prosthet Dent 2004;92: 359-64.
47. Reich S, Petschelt A, Lohbauer U. The effect of finish line preparation and layer thickness on the failure load and fractography of ZrO2 copings. J Prosthet Dent 2008; 99: 369-76.
48. Eisenburger M, Mache T, Borchers L, Stiesch M. Fracture stability of anterior zirconia crowns with different core designs and veneered using the layering or the press-over technique. Eur J Oral Sci 2011;119: 253-7