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Year : 2018  |  Volume : 21  |  Issue : 3  |  Page : 380-387

In vitro Fracture strength and hardness of different computer-aided design/computer-aided manufacturing inlays

1 Department of Restorative Treatment, Faculty of Dentistry, Ataturk University, Erzurum, Turkey
2 Department of Mechanical Engineering, Faculty of Engineering, Erzincan University, Erzincan, Turkey
3 Cumhuriyet District, Tepebasi/Eskisehir, Turkey

Correspondence Address:
Dr. O Sagsoz
Department of Restorative Treatment, Faculty of Dentistry, Ataturk University, Erzurum
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/njcp.njcp_58_17

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Objective: The purpose of this study was to examine the fracture strength and surface microhardness of computer-aided design/computer-aided manufacturing (CAD/CAM) materials in vitro. Materials and Methods: Mesial-occlusal-distal inlays were made from five different CAD/CAM materials (feldspathic ceramic, CEREC blocs; leucite-reinforced ceramic, IPS Empress CAD; resin nano ceramic, 3M ESPE Lava Ultimate; hybrid ceramic, VITA Enamic; and lithium disilicate ceramic, IPS e.max CAD) using CEREC 4 CAD/CAM system. Samples were adhesively cemented to metal analogs with a resin cement (3M ESPE, U200). The fracture tests were carried out with a universal testing machine. Furthermore, five samples were prepared from each CAD/CAM material for micro-Vickers hardness test. Data were analyzed with statistics software SPSS 20 (IBM Corp., New York, USA). Results: Fracture strength of lithium disilicate inlays (3949 N) was found to be higher than other ceramic inlays (P < 0.05). There was no difference between other inlays statistically (P > 0.05). The highest micro-Vickers hardness was measured in lithium disilicate samples, and the lowest was in resin nano ceramic samples. Conclusion: Fracture strength results demonstrate that inlays can withstand the forces in the mouth. Statistical results showed that fracture strength and micro-Vickers hardness of feldspathic ceramic, leucite-reinforced ceramic, and lithium disilicate ceramic materials had a positive correlation.

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