Abstract
Polymer infiltrated ceramics are hybrid materials that combine the strength of ceramics and the flexibility of polymers. The aim of this study was to compare the fracture load capacity of monolithic CAD/CAM crowns with different occlusal thicknesses, made from polymer infiltrated ceramic network. Fifteen full contour CAD/CAM crowns made of Vita Enamic with occlusal thicknesses of 0.5 mm, 1.0 mm and 1.5 mm were fabricated with a wet milling machine. Restorations were cemented on human molars with adhesive cement. Samples were loaded along the long axis until fracture, with a single static compressive force. A scanning electron microscope (SEM) was used to examine the fracture surface of specimens after the fracture. The results of this study reveals that the fracture load of the samples increased progressively with the occlusal thickness. The highest fracture value was recorded for1.5 mm occlusal thickness of the crown. No statistically significant difference was reported between the three experimental groups. It can be concluded that hybrid monolithic CAD-CAM crowns showed sufficient fracture strength to be used for single restorations in the posterior area, even with a reduced occlusal thickness.
Highlights
conventional impression. The digital design (CAD)/CAM (Computer-Aided Design/ Computer-Aided Manufacturing) technology was used with success in dentistry for more than two decades
In these figures the force – displacement curve obtained after compression tests for specimens with different thicknesses (0.5 mm, 1.0 mm, 1.5 mm) is represented
This study aimed to evaluate fracture load of thin occlusal crowns fabricated of CAD/CAM PICN material under a static compressive load [27]
Summary
CAD/CAM (Computer-Aided Design/ Computer-Aided Manufacturing) technology was used with success in dentistry for more than two decades. This has brought a lot of advantages, such as shorter treatment time, industrial fabrication of the materials [1,2], with improved characteristics and reduced failure rates [3,4]. Some of the CAD/CAM materials are ready to use immediately after the milling process. They do not need furnace firing, sintering or crystallization, providing patients restorations in a single visit session [5,6]. Ceramic blocks were the first CAD-CAM materials developed for in office use, showing superior mechanical properties, outstanding esthetic, color stability, and excellent biocompatibility [10,11]
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