resin is a promising option in computer-aided design and computer-aided
manufacturing (CAD/CAM) dentistry; however, the wear resistance of
composite resin remains a primary concern.
purpose of this in vitro study was to evaluate the wear resistance of 5
CAD/CAM materials (n=10), consisting of 4 composite resins (3M Lava
Ultimate, Kerr experimental composite resin material, Vita Enamic, 3M
Paradigm MZ100) and 1 ceramic (Vita Mark II) in contact with natural
human enamel cusps.
Material and methods
were loaded into a computer-controlled mastication simulator and
subjected to 200000 mechanical cycles (49 N) against natural human
enamel simultaneously with 500 thermal cycles (5°C to 50°C to 5°C). The
wear resistance was analyzed by measuring the vertical substance loss
(the maximum depth of the worn area) in the contact point area of the
specimen. The worn surfaces were observed by scanning electron
microscopy to determine the wear patterns.
Mark II exhibited the best wear resistance among the tested materials,
followed by 3M Lava Ultimate, Vita Enamic, and 3M Paradigm MZ100. The
Kerr experimental material exhibited the lowest wear resistance, yet its
results were not significantly different from those of the 3 other
composite resin blocks (P>.05).
the limitations of this in vitro study, the wear resistance of
composite resin blocks in contact with enamel cusps was significantly
lower than that of a ceramic block.