Farklý yüzey hazýrlýk iþlemlerinin rezin bazlý, polimer infiltre seramik ve feldspatik cad/cam materyallerinin yüzey pürüzlülüðüne etkisi

GÝRÝÞ ve AMAÇ: Bu çalýþmanýn amacý farklý yüzey hazýrlama iþlemlerinin rezin bazlý, polimer infiltre seramik ve feldspatik bazlý CAD/ CAM materyallerinin yüzey pürüzlülüðüne etkisini incelemektir.
YÖNTEM ve GEREÇLER: Rezin bazlý (Lava; 3M ESPE ve Cerasmart; GC), polimer infiltre seramik (Enamic; Vita) ve feldspatik seramik (Cerec; Sirona Dentsply) CAD/CAM bloklar 2 mm kalýnlýkta örneklere ayrýldý ve her bir CAD/CAM materyalinden 30’ar adet örnek elde edildi. Rezin bazlý CAD/CAM bloklarý kendi içinde cila, kontrol (kumlama (SB)), kombine uygulama (kumlama+hidroflorik asit (SB+HF)); seramik bazlý CAD/CAM bloklarý ise cila, kontrol (hidroflorik asit (HF)), kombine uygulama (SB+HF) olmak üzere 3’er alt gruba ayrýldý (n=10). Cila grubunda örnekler 1200 gritlik SiC zýmparaya kadar cilalandý. Kumlama grubunda örnekler 50 µm alüminyum oksit ile kumlanýrken, HF asit grubunda örnekler %5’lik HF asit (Ultradent) ile 60 sn asitlendi. Kombine gruplarda örnekler kumlama iþlemini takiben asitlendi. Tüm örneklerin yüzey pürüzlülük deðerleri (Ra) profilometre cihazý (Perthometer M1 Mahr) kullanýlarak ölçüldü. Sonuçlar one way ANOVA ve post hoc Tukey testleri ile deðerlendirildi (p<0.05).
BULGULAR: Cilalanmýþ Cerec en düþük yüzey pürüzlülük deðerlerini verirken, Enamic istatistiksel olarak en yüksek Ra deðeri göstermiþtir (p<0,01). Yüzey iþlemleri bütün materyallerde yüzey pürüzlülükleri istatistiksel olarak anlamlý düzeyde artmýþtýr (p<0,01). HF asit uygulamasý sonrasý Enamic, Cerec grubuna kýyasla istatistiksel olarak daha yüksek Ra deðeri gösterirken (p<0,01), kumlama sonrasý Cerasmart ve Lava gruplarý arasýnda fark gözlenmemiþtir (p=0,446). Kombine uygulamalar sonucunda en yüksek yüzey pürüzlülüðü Cerasmart’ta izlenmiþtir.
TARTIÞMA ve SONUÇ: Cerec materyalinin en az pürüzlülük deðerine sahip CAD/CAM blok olduðu gözlenmiþtir. Yüzey iþlemleri rezin, polimer infiltre ve feldspatik bazlý CAD/CAM materyallerinin yüzey pürüzlülüklerini arttýrmýþ ve bu etki materyalin yapýsýna göre deðiþiklik göstermiþtir.

The effect of surface preparation methods on the surface roughness of resin based, polymer infiltrated ceramic and feldspatic CAD/CAM materials

INTRODUCTION: The aim of this study was to determine the effect of surface preparation methods on the surface roughness of resin based, polymer infiltrated ceramic and feldspatic CAD/CAM materials.
METHODS: Two types of resin based CAD/CAM materials (Lava; 3MESPE and Cerasmart; GC), polymer infiltrated ceramic (Enamic; Vita), and feldspatic ceramic (Cerec; Sirona, Dentsply) blocks were cut into slabs of 2 mm thickness and 30 specimens were obtained from each CAD/CAM blocks. While resin based blocks were divided into three subgroups as untreated, control (sandblasting (SB)), combined (sandblasting+ hydrofluoric acid (SB+HF)); ceramic groups were divided into three subgroups as untreated, control (HF etch), combined ((SB+HF)). In untreated groups, specimens were polished up to 1200 grit SiC paper while sandblasted with 50 µm aluminum oxide in SB groups. In SB+HF groups, the specimens were sandblasted and etched. Surface roughness (Ra) were measured using digital profilometer (Marh, Perthometer M2). Statistical analysis was performed using One-way ANOVA and post hoc Tukey test.
RESULTS: The lowest Ra value was obtained with untreated Cerec blocks while Enamic resulted in significantly highest Ra value (p<0,01). Surface preparation methods significantly increased the surface roughness of CAD/CAM materials (p<0,01). Following HF etch, Enamic exhibited significantly higher Ra values than Cerec. After sandblasting, Cerasmart and Lava showed significantly similar Ra values. Following combined preparation methods, Cerasmart showed the highest Ra values.
DISCUSSION AND CONCLUSION: Cerec CAD/CAM blocks exhibited the smoothest surface. Sandblasting and acid etching resulted in increased surface roughness of resin based, polymer infiltrated and feldspatic CAD/CAM materials and its effects differs from the material structure.