Effect of Different Storage Media on the Surface Roughness of two CAD/CAM Materials

Document Type : Original articles

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1 Teaching assistant of Fixed Prosthodontics, Fixed Prosthodontics Department, Faculty of Dentistry Egyptian Russian University. Cairo, Egypt

2 Lecturer of Fixed Prosthodontics, Fixed Prosthodontics Department, Faculty of Dentistry Ain Shams University

3 Associate professor of Fixed Prosthodontics, Fixed Prosthodontics Department, Faculty of Dentistry Ain Shams University

Abstract

Abstract:
Purpose: To assess the surface roughness of two of CAD/CAM Ceramic materials: Lithium disilicate and Resin nanoceramic, after being stored in three media: Instant coffee, Citric Acid and Artificial saliva. Materials and methods: A total number of 42 slices cut by low speed diamond saw with water coolant of IPS e.max CAD & Cerasmart ceramic blocks (n=21 for each material) and shade A3. The samples were divided into three subgroups (n=7 for each storage medium): Sub-Group 1: stored in instant coffee, Sub-Group 2: stored in citric acid, Sub-Group 3: stored in artificial saliva. All samples were subjected to thermocycling at 5000 cycles between 5 and 55 degrees in deionized water with a dwell time of 30 seconds, and transfer time of 10 seconds. Surface roughness values were determined by a surface Profilometer. The data were analyzed using One Way ANOVA test followed by Tukey`s Post Hok test for multiple comparisons. The significant level was set at P ≤ 0.05. Results: Immersion in different media had no significant difference on surface roughness of tested ceramics. However, polished Cerasmart had less surface roughness than glazed IPS e.max CAD. The Null hypothesis proposed was that aging in different storage media will not affect the surface roughness of Cerasmart and IPS e.max CAD was accepted. Conclusion: Immersion in instant coffee, citric acid and artificial saliva did not alter the surface roughness of IPS e.max CAD and Cerasmart.

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