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EFFECTS OF BLUMIA NERVOSA ON MECHANICAL PROPERTIES OF DIFFERENT CAD-CAM MATERIALS

PURPOSE: Observation of the changes in mechanical characteristics and surface topography of CAD-CAM (computer aided design-computer aided manufacturing) restorative materials under the well-established blumia nervosa (BN) and control conditions. MATERIALS AND METHODS: Three different CAD-CAM materials chosen as A1 shade and high translucent (HT) [IPS e.max CAD (Ivoclar Vivadent, Schaan, Liechtenstein), Celtra Duo CAD (Dentsply Sirona, York, Pennsylvania), Ceramill Zolid HT+ PS (Amann Girrbach AG, Koblach, Austria)]. All samples (N=120) with 1.5 mm were polished with 3 step Optra Fine Intra Oral Polishing Kit (Ivoclar Vivadent, Schaan, Liechtenstein). Samples were distributed into 6 subgroups (n=18), 2 samples from each group were chosen for topography evaluations. The exposure time was calculated as 486.5 hours to simulate patients who have BN for five years. Blumic subgroups were stored in BN solution with 1.6 pH and control subgroups were stored in artificial saliva with 7 pH during the experiment period. Surface roughness change (∆Ra) was measured by contact profilometer (Perthometer M1, Mahr GmbH, Ingolstadt, Germany), surface microhardness and fracture toughness change (∆VHN, ∆KIc) were measured by Vickers hardness device (Micromet 5114D, Buehler, Lake Bluff, Illinois), and surface topography evaluations were made by scanning electron microscope (EVO 40, Carl Zeiss Microscopy, Oberkochen, Germany) and 3D optical profilometer (Nanomap-500LS, AEP Technology, Santa Clara, California, USA) before (T0) and after (T1) the solution exposures. Data were analyzed with repeated measures two-way ANOVA, one-way ANOVA and paired samples t tests (p<0.05). RESULTS: ∆Ra value of Ceramill Zolid HT+ PS samples exposed to blumic solution was significantly higher than those exposed to control solution (p=0.004). Control solution significantly increased the VHN of IPS e.max CAD samples more than blumic solution (p=0.000). Blumic solution significantly decreased the VHN of Celtra Duo CAD samples (p=0.000) and KIc of IPS e.max CAD and Ceramill Zolid HT+ PS samples more than control solution (p=0.000, p=0.000). CONCLUSION: All materials were affected more negatively by blumic solution compared to control solution according to mechanical properties, however all changes seemed to be in the clinically acceptable range. Ceramill Zolid HT+ PS was found as the most stable material choice according to mechanical properties in non-blumic patients. After all, Ceramill Zolid HT+ PS was found as the hardest and toughest material before and after both blumic and control solution exposures.

ELİFNAZ ÖZEN
Yeditepe University
Turkey

PINAR KURSOĞLU
Yeditepe University
Turkey

 


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